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MAN0604_Issue 09_02-2013

Apex

2110M8030

APPENDIX A - SPECIFICATIONS

Calibration Required

31 Transmitter Alarm Setting Failure

32 Sensor Comms Failed

102

Fatal Fault

202

101

Transmitter Failed

204

102

Transmitter Failed

226

113

Transmitter Failed

A.4.3 Sensor Object

The sensor object has one network variable input and eleven network variable outputs.

nviResetAlm input

This network variable causes latching alarms and faults to be reset. The reset will only take place if

the cause of the fault or alarm no longer exists. Additionally, the reset only occurs when a non-zero

update is sent to this input.
This means that sending an

ST_LOW

to this input once will not have any effect on alarms or faults

that occur later. This input resets both the local relays and LonWorks network variables.

nvoAlmL output

This network variable normally has the value

ST_OFF

. When a level 1 alarm exists the

alarm1

relay

will be activated and this output will have the value

ST_LOW

When a level 2 alarm exists the

alarm2

relay will be activated and this will produce

ST_ME

nvoAlm2 output

This variable normally has the value

ST_OFF

. When a level 2 alarm exists this will have the value

ST_MED

This network variable is provide for use with common shutdown relays that are not capable of

discriminating between

ST_LOW

and

ST_MED

in installations where discrimination between

alarm1

and

alarm2

is desired.

nvoAlarmThresh1 and nvoAlarmThresh2 outputs

These network variables indicate the current alarm thresholds of this instrument. Gas concentrations

greater than the amount reported in these variables will cause the alarms to activate. See the related

subsequent discussion of

nviHighLim1

and

nviHighLim2

The units are the same as the front panel display and will be indicated by

nvoConcType

, below. The

units will be

ppm

%LEL

and

%V/V

respectively when gas sensor cartridges for toxic, explosive and

oxygen gasses are installed.
For example if an H

cartridge is installed and

nvoAlarmThresh1

50.00

, this means that

alarm1

will

activate when the H

concentrations exceeds

20,000 ppm

since LEL for H

40,000 pp

Содержание Apex

Страница 1: ...1 www norrscope com www norrscope com MAN0604_Issue 09_02 2013 Apex 2110M8030 Apex Technical Handbook ...

Страница 2: ...ed 2 Alarms should not be reset until it is confirmed that gas is not present 3 Hazardous voltages may exist at alarm contacts Ensure power is disconnected at source prior to servicing contacts 4 Gas events occurring while accessing the Transmitter Unit menus will not be reported locally 5 Overrange flammable gas readings may indicate an explosive concentration of gas Certified Sensor only 1 When ...

Страница 3: ...d by the mating surfaces of the unit s top and base 8 During installation maintenance only use the supplied parts Replacement with alternatives will invalidate certification 9 Exposure to fluorinated hydrocarbons or silicones will poison the sensor beads on catalytic sensor cartridges If a sensor is known to have been poisoned then it must be re calibrated If not sure then flow gas over the sensor...

Страница 4: ... Configuration 29 3 2 Certified Junction Box and Certified Sensor 31 3 2 1 Installing the Certified Junction Box 32 3 2 2 Fitting the Certified Sensor 34 3 2 3 Installing the Gas Sensing Cartridge 36 3 2 4 Certified Junction Box Configuration 37 3 3 LonWorks Communications Board 38 3 3 1 Removing the Transmitter Unit top 39 3 3 2 Removing the Main PCB assembly from the top 40 3 3 3 Fitting the Lon...

Страница 5: ...ing Communication Boards to Networks 87 5 MAINTENANCE 89 5 1 Routine maintenance schedule 89 5 2 Maintenance Procedures Parts Replacement 90 5 2 1 Changing the Certified Sensor Filter 90 5 2 2 Changing the Certified Sensor Cartridge 91 5 2 3 Changing the Certified Sensor 95 5 2 4 Changing the Transmitter Unit Front Panel Assembly 98 APPENDIX A SPECIFICATIONS 100 A 1 Transmitter Unit and Sensor 100...

Страница 6: ... 1 LonWorks Network Variables 114 A 4 2 Node Object 114 A 4 3 Sensor Object 116 A 4 4 Virtual Function Block 117 A 4 5 Implementation of nviRequest 118 A 4 6 Interpretation of nvoStatus 119 APPENDIX B Certification 120 B 1 Transmitter Unit 120 B 2 Certified Sensor 121 B 3 Certified Junction Box 123 B 4 Accessories 124 B 5 Control Drawings 125 APPENDIX C Accessories SPARE PARTS 127 C 1 Accessories ...

Страница 7: ...7 MAN0604_Issue 09_02 2013 Apex 2110M8030 ...

Страница 8: ...erface The Transmitter Unit can have the Certified Sensor fitted to it locally or mounted remotely using a Certified Junction Box and additional cabling up to 100 metres long The Transmitter Unit provides a 4 20mA output as well as an optional digital output Relays for operating locally wired devices such as lights horns etc are included The range of accessories enhances operation of the system an...

Страница 9: ...WARNING Indicates hazardous or unsafe practice which could result in severe injury or death to personnel Caution Indicates hazardous or unsafe practice which could result in minor injury to personnel or product or property damage Note Provides useful helpful additional information Trademarks The following trademarks are used in this handbook Teflon and Freon are registered trademarks of E I DuPont...

Страница 10: ...ansmitter Unit The Transmitter Unit provides a mounting point for a Certified Sensor and contains all the electronics associated with the gas detection system It features an LCD display screen that displays the controlling software menu system and also a set of buttons that let an operator user interact with the system by accessing the menus and responding to displayed messages The Transmitter Uni...

Страница 11: ...4_Issue 09_02 2013 Apex 2110M8030 Cable conduit entry sealing plug 1 off Interconnect PCB Locating pins External earth Unit base Certified Sensor mounting Cable conduit entry 2 off Captive bolt 3 off 2 OVERVIEW ...

Страница 12: ... which fit in place of the sensor cap see 2 3 The four types of cartridge are electrochemical cell catalytic SG16 type oxygen thick film Caution Only cartridges with the following part numbers can be fitted to the Certified Sensor 2110B30x0 31x0 32x0 33x0 34x0 35x0 series 2110B3700 2110B3999 range Certified Sensor approved to CSA C22 2 No 152 only when fitted with specific cartridges installed See...

Страница 13: ...w for its extra length an Oxygen Transducer Adaptor supplied with the cartridge mounts on the sensor bayonet fixing The Oxygen cartridge is then inserted and the cap or accessory fitted Cartridge Cap or accessory Seal or filter optional Sensor body Sensor cable Certification label L W L G E R E E Z 53mm 165mm 177mm with Oxygen transducer Oxygen transducer adaptor ...

Страница 14: ...40 to aid sensor calibration and gas sample monitoring Weather Housing Part No 2110B2150 to protect the sensor from harsh weather Sunshade Part No 2110B2152 to protect the sensor from direct sunlight Filters three different filters to provide protection for the gas sensing cartridge O2 Transducer Adaptor supplied with Oxygen cartridges to allow for their longer length over standard cartridges 2 3 ...

Страница 15: ...15 MAN0604_Issue 09_02 2013 Apex 2110M8030 2 OVERVIEW Interconnect PCB External earth Unit base Certified Sensor mounting Cable conduit entry 2 off Captive bolt 3 off 152mm 95mm ...

Страница 16: ...vely prolonged fit against a wall or other flat surface Conforms to CSA C22 2 No 152 when fitted to the Certified Sensor with specific cartridges installed See specifications for details The Collecting Cone is attached to the sensor by means of a bayonet fitting Inside the cone is a 1 4in O D nozzle that can accept a tube and which provides a means to directly inject gas to the front of the sensor...

Страница 17: ... the gas is applied to and flows gas across the face of the sensor rather than onto its face The difference in reading between a calibration made with the Flow Housing accessory and one made under diffusion conditions in a tank of still gas is less than 30 The Flow Housing is suitable for flow rates in the range of 0 7 1 litre per minute flow across the cell A hydrophobic filter is supplied with t...

Страница 18: ...s transported to the face of the sinter is by diffusion only Under such conditions the weather protection will slow the rate at which gas can reach the sensing element and consequently the speed of response of the sensor to gas will be reduced As well as providing weather protection the housing also provides a means to directly inject gas to the front of the sensor via a 1 4in O D nozzle for gas r...

Страница 19: ... by means of a bayonet fitting 2 3 7 Filters One of three different types of filter accessory can be fitted to the Certified Sensor in place of the rubber seal inside the sensor cap or accessory The three different types of filter available are Mesh filter Part Number 2110B2170 for use in harsh environments The filter prevents dirt from blocking the cartridge sinter Hydrophobic filter Part Number ...

Страница 20: ...nit and Certified Sensor install an Certified Junction Box accessory with Certified Sensor suitable for remote operation install a LonWorks Communications Board in a Transmitter Unit This is to enable the unit to be controlled and communicate over a digital network e g LonWorks Caution Do not install a communications board into a UL or CSA certified Transmitter Unit install the system accessories ...

Страница 21: ...t is the responsibility of the installation design authority to ensure that the electrical installation meets appropriate standards 1 The unit should not be electrically connected to electrically noisy dirty metalwork or conductors The case should be connected to a low noise clean earth line via the screen on the field cabling 2 The entire length of the field cabling connected to each unit should ...

Страница 22: ...mum conductor size of 2 5mm2 14AWG The recommended minimum conductor size is 0 75mm2 20AWG The conductors should be sized to give a total power supply loop resistance of less than 30 Ohms ECC cartridge or 16 0hms Catalytic cartridge If remote mounting the sensor from the transmitter a 4 core screened cable with a minimum conductor size of 0 75mm2 20AWG is required 3 1 Transmitter Unit and Certifie...

Страница 23: ...base with either two M10 bolts or a single 10mm U bolt Cable conduit entry sealing plug Top retaining cable Unit top ZIF Locating pins External earth Unit base Certified Sensor mounting point Cable conduit entry 2 off Captive bolt 3 off Interconnect PCB Ribbon cable Flamepath Flame path Cable securing screw 3 Detach the top of the Transmitter Unit Unscrew the three captive M8 bolts in the base Sup...

Страница 24: ...re with all cables screened Single cable conduit entry Power 4 20mA Digital Comms Relays Cores used 2 1 3 2 2 4 2 2 6 10 2 2 2 6 2 2 4 Twin cable conduit entries Power 4 20mA Digital Comms Relays 2 2 4 cores 6 6 cores 2 2 2 6 cores 6 6 cores 2 x power in 2 x power out 2 x comms in 4 cores 2 x comms out 4 cores More complex wiring schemes may need to use external Certified Junction Boxes either bec...

Страница 25: ...he sensor wiring See the following wiring table and diagram Terminal Function Colour Recommended Number Wire Length SK3 1 CAN_L White 40mm Sensor 2 CAN_H Green 40mm 3 V Red 40mm 4 0V Black 40mm 5 Screen 40mm SK4 1 NET1 60mm Comms 2 NET2 60mm and 3 Ground 50mm Power 4 4 20mA 50mm 5 4 20mA 50mm 6 0V 50mm 7 24Vdc 18 32Vdc 50mm SK6 1 Fault 50mm Relays 2 Fault common 50mm 3 Alarm 1 50mm 4 Alarm 1 commo...

Страница 26: ...ptive bolts supplied replacement with alternative bolts will invalidate certification Follow the reverse of the removal procedure supporting the top The top should be positioned using the locating pins on the Apex Transmitter Unit base and then lowered onto the base Ensure that the lid retaining cable and wiring is not trapped and the O ring in the top is correctly located Ensure that the ribbon c...

Страница 27: ...e Before installing a cartridge check that the number on the cartridge label matches the gas type and range for the function required Caution Only cartridges with the following part numbers can be fitted to the Certified Sensor 2110B30x0 31x0 32x0 33x0 34x0 35x0 series 2110B3700 2110B3999 range Note Conforms to CSA C22 2 No 152 only when fitted with specific cartridges See specifications for detai...

Страница 28: ...y Plug 2 off Locating tab Cartridge Note If fitting an Oxygen cartridge ensure that the Oxygen Transducer Adaptor supplied with the Oxygen cartridge is fitted to the Certified Sensor body The adaptor is fitted to the sensor body via a bayonet fitting 3 Refit the cap to the Certified Sensor Reverse the removal procedure 4 Check for correct operation of the system by carrying out the procedures desc...

Страница 29: ... and J3 set the contact operation for the Fault Alarm 1 and Alarm 2 relays respectively J1 Fault relay normally energised Normally open default Normally closed J2 and J3 Alarm 1 and 2 Relays normally de energised Normally open default Normally closed Note Relay states shown are the shelf state Relay contacts are rated at 100mA min 2A max 30Vdc non inductive HIGHER VOLTAGES MUST NOT BE USED UL spec...

Страница 30: ...rce Sink J4 J5 4 4 20mA 4 20mA not used 5 4 20mA not used 4 20mA Note Total 4 20mA loop resistance should be less than 300 ohms Total power supply loop resistance should be less than 30 ohms ECC cartridge or 16 ohms catalytic cartridge Typical power consumption with relays active is 3 6W ECC cartridge or 5 6W catalytic cartridge Isolated Mode 4 wire 3 INSTALLATION J5 SK4 J4 4 20mA 4 20mA 1 2 3 4 5...

Страница 31: ...31 MAN0604_Issue 09_02 2013 Apex 2110M8030 3 INSTALLATION Current Sink Mode 3 wire Current Source Mode 3 wire J5 SK4 J4 4 20mA 1 2 3 5 6 7 0V 24V dc 4 J5 SK4 J4 4 20mA 1 2 3 4 6 7 0V 24V dc 5 ...

Страница 32: ...or Apex Transmitter Unit o Apex Transmitter Unit with Certified Sensor mounted in Certified Junction Box European style installation Certified Junction Box with Certified Sensor Apex Transmitter Unit o The system components can be installed by a single technician This procedure describes how to install a Certified Junction Box fit the Certified Sensor to the Certified Junction Box connect up the C...

Страница 33: ... Ensure a gas free atmosphere 2 Attach the Certified Junction Box to the supporting structure Drill two mounting holes 68mm apart and use the unit s mounting slots in the base with either two M10 bolts or a single 10mm U bolt 3 Remove the Certified Junction Box lid Unscrew the three captive M8 bolts The lid is retained by a metal retaining cable attached to the base Certification label Lid retaini...

Страница 34: ...ed sealing plug one plug is supplied fitted 2 For a multi sensor system using a network loop both cable conduit entries are used one bringing the loop connections in and the other taking them out of the box Remove the fitted certified sealing plug from the spare cable conduit entry 3 2 2 Fitting the Certified Sensor 1 Fit the Certified Sensor to the Certified Junction Box Certified Sensor mounting...

Страница 35: ...V Black 5 Not used SK4 1 Screen 2 Screen G Earth Green Yellow Only connect cable screens to these terminals if they are isolated at the remote end Note Three sensor wiring terminal blocks are provided SK1 SK2 SK3 any two can be used 1 2 3 4 5 5 4 3 2 1 2 1 1 2 3 4 5 Internal earth SK4 SK3 SK2 SK1 J1 3 Configure the Certified Junction Box if required ...

Страница 36: ...k that there is no discernible gap between the top and the base Tighten the captive M8 bolts to 5Nm 3 68 foot pounds 3 2 3 Installing the Gas Sensing Cartridge 1 Remove the cap from the Certified Sensor body Sensor body Sensor cap Rotate the cap or accessory 1 4 turn in an anticlockwise direction to release the bayonet fitting 2 Fit the gas sensing cartridge into the sensor body WARNING Sensor Car...

Страница 37: ...correctly aligned with the recess in the sensor body Position the tab so it is resting on the tab recess wall to the right or left of the tab recess and then turn the cartridge until the tab drops into the recess Caution Do not force the cartridge as this may cause damage to the pins of the connecting plugs Twisting and pushing can bend the pins and make the cartridge inoperative Socket 2 off Loca...

Страница 38: ... a single person It is fitted into the top of the unit to form part of theMain PCB assembly Note Do not install a communications board into a UL or CSA certified Transmitter Unit Refer to the General Installation Guidelines at the beginning of this chapter Fitting the board should be carried out by a qualified technician Electrical interconnections for the communications board are made at the same...

Страница 39: ...handling electrostatic discharge sensitive devices 2 Ensure that the Apex Transmitter Unit flamepath is not damaged during this procedure The flamepath is formed by the mating surfaces of the Apex Transmitter Unit top and base see diagram 1 Isolate all associated power supplies and ensure that they remain OFF during this procedure Ensure a gas free atmosphere 2 Disconnect from the Transmitter Unit...

Страница 40: ...vertically upwards until it is felt to stop and the ribbon cable is loose 5 Pull the ribbon cable clear Remove the top and take to a workshop area 3 3 2 Removing the Main PCB assembly from the top 1 Place the top with the certificate face down on a flat surface This provides access to the components inside the top Ribbon cable PCB baffle PCB baffle PCB baffle securing screw 2 off Main PCB Potted a...

Страница 41: ... its antistatic bag 3 Position the Communication Board over the Main PCB Ensure the mounting pillars point downwards Check that the two plugs on the Communication Board are correctly aligned with the sockets on the Main PCB and the mounting pillars are aligned with their mounting holes 4 Carefully press the Communication Board down evenly onto the Main PCB Ensure that the pillars locate in their m...

Страница 42: ...e Communication Board earth lead through the top middle hole in the baffle Secure the earth lead under one of the two baffle securing screws Tighten the screws to 1 0Nm 0 74 foot pounds 3 3 5 Connecting the LonWorks Network Wiring 1 Fit and connect the communication network field wiring to SK4 in the base of the Transmitter Unit Refer to the table and diagram for wiring details Use either Conduit ...

Страница 43: ...Fit and tighten the single M6 hexagon screw that secures the cable to the base Tighten the M6 screw to 3Nm 2 21 foot pounds Remove the support for the top and let the top down gently until it is supported by the retaining cable 3 Reconnect the ribbon cable into the ZIF connector on the Interconnect PCB in the base of the Transmitter Unit Follow the reverse of the removal procedure ensuring that th...

Страница 44: ...system by carrying out the procedures described in the following section 3 3 7 Operational Check After installing the Communication Board and connecting the communication network wiring it is necessary to check that the Apex Transmitter Unit Certified Sensor and Communication Board are working correctly together and also bind the equipment which now acts together as a node to the communication net...

Страница 45: ...s N A Baud Rate 78 0kbit s Node S W Ver 1 0 Assert Service PIN For a full explanation of the information see Chapter 4 9 Select the Assert Service PIN option 10 Press the ok button This binds the node to the network The display automatically returns to the Configuration Menu 11 Press the esc button twice This returns to the Gas Reading display via the Main Menu 3 4 Accessories All the accessories ...

Страница 46: ...e lug location points in the cap or accessory 3 For the Collecting Cone only fit the cone onto the supplied housing The Collecting Cone is supplied as a kit of two parts that clip together 4 Fit the rubber seal filter to the accessory Ensure that the rubber seal or filter is correctly installed in the accessory the correct way round with the three lugs closest to the front face of the accessory an...

Страница 47: ... procedure 1 Remove the Certified Sensor cap or accessory Sensor body Sensor cap The cap or accessory is held by means of a bayonet fitting Unscrew 1 4 turn anticlockwise and pull off 2 Slide the Sunshade clamp over the sensor body The shade should be positioned so that the whole sensor is shielded 3 Fit the supplied self tapping screw through the Sunshade clamp s left hand hole looking from the c...

Страница 48: ...TION Clamp right hand hole Clamp left hand hole Self tapping screw 4 Drive the screw home into the clamp s right hand hole until the Sunshade s clamp grips the Certified Sensor body tightly 5 Refit the sensor cap or accessory Reverse the removal procedure ...

Страница 49: ...provides operational information about the following Display and control buttons Start up Passwords Menus User Tasks Fault diagnosis System Calibration Binding the Communications Board to the Network If an optional digital communications board is fitted in the Transmitter Unit e g LonWorks then control can also be achieved from a remote location 4 1 Display and Control Buttons LCD screen Control b...

Страница 50: ...lists and to select highlight a required menu option It is also used to increment displayed values down is used to move downwards through the menu lists and to select highlight a required menu option It is also used to decrement displayed values ok is used to execute acknowledge the chosen item The buttons are also used to enter the current password when required to access different menu levels se...

Страница 51: ...with the gas identity full scale and the units of measurement Note If the current Gas Reading exceeds full scale the displayed reading will be replaced with This information is also transmitted on the 4 20mA output and optionally on the digital network if a communications board is fitted in the Transmitter Unit Note If the Transmitter Unit has a LonWorks Communications Board fitted then the unit w...

Страница 52: ...elected is implemented immediately If it is not correct the asterisks are cleared and the user must enter the correct password to proceed 2 The default password supplied when the unit is first delivered is entered by pressing the ok up down and down buttons in sequence This provides initial access to all of the menus The password level hierarchy allows the following Functions available at Level 1 ...

Страница 53: ...vel 1 Password Level 2 Password Level 3 Password 6 Navigate to the password level option to be changed Use the up down keys 7 Press ok The following screen is displayed Level 1 Password Enter Old Password This example shows the Level 1 Password screen The screens for Levels 2 and 3 are similar 8 Enter the current password for the chosen level Use the buttons on the front panel If setting the passw...

Страница 54: ...ed at the prompt during step 10 the following screen is displayed Level 1 Password Failure OK Continue 1 Press ok The display returns to the Change Passwords Menu 2 Repeat the procedure re entering the correct password 4 3 2 Password reset The Reset Passwords option allows the system administrator to reset all the passwords back to the default password supplied when the unit is first delivered i e...

Страница 55: ...s are reset to their default value and the display returns to the Main Menu 4 4 Menus Menus are used to implement control of the Transmitter Unit The system Main Menu is accessed by pressing the esc button at the Gas Reading display The Main Menu provides access to the primary tasks that are required when setting up and controlling the Transmitter Unit and Certified Sensor The following diagram su...

Страница 56: ...cklight Display Menu Reset Alarms Faults Calibration Info Current Config History Log Menu View History Log Reset History Log Change Passwords Menu Level 1 Password Level 2 Password Level 3 Password The subsequent subsections describe each of the main menu options in turn and show using a flowchart format how to access and implement their sub options The following symbols are used on the flowchart ...

Страница 57: ...on must be completed successfully Failure to do so will result in the unit signaling a Calibration Needed fault Calibration Menu Gas Calibrate Gas Challenge 4 20 mA Set Zero Force 4 20mA Force Relays Force Digital The Calibration Menu allows settings for the Transmitter Unit to be made e g relay operation and also settings for the Certified Sensor e g gas calibrate This menu is protected by a Leve...

Страница 58: ...ss Yes No Span calibration ok ok Fault diagnosis Yes No Calibration Menu ok Span Calibration screen Set Span Concentration ppm ok Use up down buttons Apply Gas ok Calibrating Success Yes No ok Fault diagnosis Calibration Menu Note Depending on the type of gas cartridge fitted to the sensor a choice of two calibration gases may be displayed during Span Calibration e g C7 H8 has the options C7 H8 an...

Страница 59: ...zero to avoid extraneous alarms Provides the means to check correct operation of the unit in the presence of the gas being sensed without triggering alarms etc Selecting this menu item puts the Transmitter Unit s 4 20mA output into Inhibit and prevents the relays from being energised The Transmitter Unit does not signal Fault if one is induced Gas Challenge Calibration Menu Gas Challenge ok Apply ...

Страница 60: ...offset applies to all 4 20mA output states including Inhibit Warning Overrange and Alarms Force 4 20mA Calibration Menu Caution Ensure that when forcing a signal on the 4 20mA output that the effects on the network and controller are understood This option allows the 4 20mA output to be forced to a level selected between 0 and 22mA The default is 1mA The forced setting times out after approximatel...

Страница 61: ...vation etc Provides the means to test the operation of the Transmitter Unit s relays by forcing them in turn to be energised de energised Relays return to normal set states when in Main Menu or after a timeout period of approximately 5 minutes Force Relays ok Select relay to test Force Relays screen Test another relay Yes No ok esc Calibration Menu ok Use up down buttons Select relay state Use up ...

Страница 62: ...etc This option allows the digital output if a digital communications board is fitted to the Transmitter Unit e g LonWorks to be forced to output an alarm signal from Alarm 1 or Alarm 2 or no alarm Times out after approximately 5 minutes The 4 20mA output and relays are unaffected Force Digital ok Force Digital screen Select output from 0 1 or 2 esc Use up down buttons 0 No output 1 Alarm 1 output...

Страница 63: ...aded into the Transmitter Unit Note If the new cartridge has different parameters to the previous cartridge these are displayed for the operator to verify If a new cartridge of the same type as previously used is inserted the configured alarm thresholds of the Transmitter Unit are loaded into the new cartridge s actual parameters Caution This only works if the Lowest Allowable Alarm Level LAL of t...

Страница 64: ...he ATEX performance standard is required the warning and inhibit current shall not be configured to a value between than 3 1mA and 4 9mA Once configured to a new value the new value is output when the corresponding states occur When the Warning current is configured to be greater than 4mA the output pulses to the configured Warning current for approximately 1 second every 10 seconds Change Cartrid...

Страница 65: ...110M8030 Configure4 20mA ok Selectsetting tochange Configure4 20mAscreen Selectanothersetting Yes No ok ok CalibrationMenu esc Useup downbuttonsto choosesettingfrom Inhibit Warning Overrange Selectvalue Useup down buttons ok 4 Operation ...

Страница 66: ...ration Menu esc Use up down buttons to choose setting from Fault Relay Alarm1 Relay Alarm2 Relay Select relay state ok Use up down buttons to choose state from ND Normally De energised Non Latching NE Normally Energised Non Latching ND Latching NE Latching Note Alarm recovery is below alarm setpoint 25 As well as the ability to set the default state of the relay operation energised or de energised...

Страница 67: ...osed Implementation Use the Configure Relays menu option to set the Fault relay operation requirement Place the jumper on the J1 link to set the contact operation as follows This circuit diagram shows this Normally Closed Normally Open Fault Common Fault J1 Fault Alarm 1 Alarm 2 SK6 6 5 4 3 2 1 Fault Relay Relay in de energised state Other relays similar J2 J3 J1 ...

Страница 68: ... Overrange latching is not latched When activated overrange latching causes the Transmitter Unit to latch the A1 and A2 Alarm relays and the 4 20mA output if an overrange gas condition is detected Overrange latching only effects alarm relay latching after an overrange condition not at the A1 and A2 alarm thresholds Overrange latching only operatesin the normal Transmitter Unit active condition not...

Страница 69: ...sed for digital output Node Id Displays the identifier for the Transmitter Unit Node Address Shows the address of the unit on the digital network if applicable Baud Rate Displays the current network communications rate Node S W Ver Shows the version of the board software The list also provides a choice Assert Service Pin to bind the Transmitter Unit to the host digital network see 4 8 Caution If a...

Страница 70: ...age from list ok Use up down buttons Configuration Menu Configure Backlight Configuration Menu This option allows the LCD screen backlight to be switched on or off Notes 1 The Configure Backlight control is not available on CSA Certified Transmitter Units 2 The backlit screen is best viewed in a darkened location Configure Backlight ok Configure Backlight screen Toggle backlight on or off ok Use u...

Страница 71: ...he state of each of the Transmitter Unit alarms These are Fault Relay Alarm1 Relay Alarm2 Relay and Overrange Each of these can be Active or Inactive It also allows latched alarms and overrange to be reset provided that the conditions responsible for causing them are no longer present Note Alarms are not reset until the esc button is pressed to leave the Display Menu and return to the Main Menu 4 ...

Страница 72: ...l in hours Predicted Life Displays the typical life of the cartridge in hours Current Config Display Menu This option displays 2 screens sequentially that report the current Transmitter Unit and Certified Sensor configuration settings e g alarm settings relay configurations etc Initial Screen An example of a typical initial screen is as follows Current Config Gas PH3 FSD 1 200 ppm Alarm1 0 150 ppm...

Страница 73: ...e Alarm2 Relay Tx Version Displays the current version of the transmitter software Sensor Version Reports the current version of the Certified Sensor software Note The abbreviations used on the screen for the contact settings mean the following ND Normally De energised NE Normally Energised L Latching NL Non Latching 4 4 4 History Log Menu The History Log Menu enables the recorded log for the unit...

Страница 74: ...mple is 22 45 i e 22nd page of 45 pages The next line contains the history clock time in hours and minutes since the event occurred Each time you subsequently view this time therefore it will be different To calculate the date time of a recorded event take the displayed time on screen away from the current date time The next lines contain the text of the log recording the event After viewing the p...

Страница 75: ...u Messages cleared from log Are you sure No Yes No 4 4 5 Change Passwords Menu The Change Passwords Menu allows the system administrator to change the passwords for each of the three levels of access This menu is protected by a Level 3 password 4 Operation Change Passwords Menu Level 1 Password Level 2 Password Level 3 Password ...

Страница 76: ...he system administrator to reset all the passwords back to the default password supplied when the unit is first delivered i e ok up down and down This provides initial access to all of the menus Access to the Reset Passwords option requires a special password that consists of the following sequence of 8 not 4 control button presses Level 1 Password ok Enter Old Password Level 1 Password screen Cha...

Страница 77: ...nal history View the unit s log History Log View History Log 2 Clearing the history log History Log Reset History Log 2 Digital communications View settings Configuration Configure Digital 2 Register the communications board Configuration Configure Digital 2 Test operation Calibration Force Digital 2 Display Screen Turn backlight on off Configuration Configure Backlight 2 Change the on screen disp...

Страница 78: ...fault cleared The following table lists all the displayed Fault F and Warning W messages Message Cause Remedy W Sensor Failed F Sensor Failed A Certified Sensor fault has developed Check the connections between transmitter and Certified Sensor Re calibrate the Certified Sensor If fault remains replace the complete Certified Sensor assembly F No Cartridge The Certified Sensor reports there is no ca...

Страница 79: ...ct but message remains replace Certified Sensor 4 6 2 General Faults The following table lists symptoms and causes for general fault diagnosis Gas Reading Symptom Cause Remedy Non zero all the time Gas could be present ensure that there is no target gas in the atmosphere Background or other volatile organic gases that may be present e g solvents can interfere with the operation of the Certified Se...

Страница 80: ...ault Conditions Type Faults 0 0 5mA Sensor Failed default is 0 5mA No Cartridge Wrong Cartridge Cartridge Failed Temperature Error End of Cell Life Calibration Needed No Sensor Sensor Comms Fail Fatal Fault Warnings 1 0 3 5mA constant Temperature Error 4 0 6 0mA pulsed 1 sec End of Cell Life default is 3mA Calibration Needed Over range 20 21 5mA Gas Reading exceeded Warnings default is 21mA full s...

Страница 81: ...ss esc at the Gas Reading display The Main Menu is displayed Main Menu Calibration Menu Configuration Menu Display Menu History Log Menu Change Passwords Menu Reset Passwords 2 Select highlight Display Menu from the list 3 Press ok 4 When prompted enter the current Level 1 password Obtain the password from the system administrator The Display Menu is shown Display Menu Reset Alarms Faults Calibrat...

Страница 82: ... this product in accordance with EN 60079 29 2 or if local national regulations require the cartridge to be calibrated this procedure should be followed This procedure is also applicable if a cartridge requires re calibration following a warning or fault message or as part of routine maintenance The calibration adjustments are carried out at the Transmitter Unit and gassing is performed at the Cer...

Страница 83: ...n points in the cap or accessory If calibrating a sensor with a flammable gas cartridge fit the hydrophobic filter supplied with the Flow Housing into the housing In either case to fit a filter into the Flow Housing first remove the factory fitted seal from the Flow Housing The seal is held in place in the housing by its three lugs Carefully prise the seal free from the lug location points in the ...

Страница 84: ...agram shows the Flow Housing accessory fitted to the Certified Sensor Certified Sensor Flow Housing 4 Press the esc button at the Transmitter Unit The Main Menu is displayed Main Menu Calibration Menu Configuration Menu Display Menu History Log Menu Change Passwords Menu Reset Passwords 5 Navigate to the Calibration Menu option Use the up down keys 6 Press ok ...

Страница 85: ...tter Unit zeros the sensor The LCD screen displays the message Calibrating Wait When successfully completed the LCD screen shows the message Success OK Continue 12 Press ok The Span Calibration screen is displayed with the message Calibrate OK ESC This gives the choice to stop the calibration procedure at this point after zero calibration or continue to include the span and full gas calibration 13...

Страница 86: ...alibrated at concentrations representative of those to be measured It is always recommended that the Certified Sensor is calibrated with the target gas it is to detect Caution Where the user calibrates any Certified Sensor using a different gas responsibility for identifying and recording calibration rests with the user Refer to the local regulations where appropriate 18 Press ok The LCD screen di...

Страница 87: ...utton on the front panel The Main Menu is displayed Main Menu Calibration Menu Configuration Menu Display Menu History Log Menu Change Passwords Menu Reset Passwords 4 Select the Configuration Menu option Use the up down keys 5 Press the enter button 6 Enter the current Level 2 password The Configuration Menu is displayed Configuration Menu Configure Digital Change Cartridge Configure 4 20mA Confi...

Страница 88: ...vice PIN option Use the up down keys 10 Press the enter button This binds the node to the network controller The display automatically returns to the Configuration Menu 11 Press the esc button twice This returns to the Gas Reading display via the Main Menu 4 Operation ...

Страница 89: ...eplace the sensor housing cartridge if necessary All models On suspected Calibrate the Test gas exposure to system see regulator contaminating Chapter 4 flow gases Replace the sensor housing cartridge if necessary All models 3 monthly Check the filters cartridge face for cleanliness Replace if required All models 6 monthly Calibrate the Test gas system see regulator Chapter 4 flow housing Cl2 O2 a...

Страница 90: ...ed to the end of the sensor body This procedure allows the filter to be safely changed with the unit powered up Note Before starting the procedure check that the new filter is the correct type for the application Three filter types are available Mesh Hydrophobic and Carbon see Chapter 2 and Appendix C To replace the filter carry out the following procedure 1 Remove the Certified Sensor cap or acce...

Страница 91: ...ed Sensor cartridge is located in the sensor body and protected by the cap or accessory This procedure allows the cartridge to be safely changed with the unit powered up Each cartridge is provided with a certificate of calibration printed on the reverse of the instruction sheet Part No 2110M8015 supplied with the cartridge that guarantees that the cartridge is calibrated and ready for use Before i...

Страница 92: ... replaced with the unit powered up as follows 7 Remove the Certified Sensor cap or accessory from the sensor body Rotate the cap or accessory 1 4 turn in an anticlockwise direction to release the bayonet fitting 8 Remove the existing cartridge The cartridge plugs into two sockets in the Certified Sensor body and is located by means of a tab To remove the cartridge without damaging it grasp the vis...

Страница 93: ...Caution Only cartridges with the following part numbers can be fitted to the Certified Sensor 2110B30x0 31x0 32x0 33x0 34x0 35x0 series 2110B3700 2110B3999 range Notes 1 Certified to CSA 22 2 No 152 only when fitted with specific cartridges See Specifications for details Carefully plug the cartridge into the Certified Sensor body ensuring that the cartridge tab lines up with the recess in the sens...

Страница 94: ...hecks are completed successfully the following type of information about the new cartridge is displayed on the screen Change Cartridge New Cartridge Type Gas HF FSD 12 00 ppm Alarm1 1 50ppm Alarm2 3 00ppm Check that the information displayed corresponds to the type of replacement cartridge fitted 11 Press ok The Change Cartridge screen now displays the following message Change Cartridge Success OK...

Страница 95: ... replace a Certified Sensor fitted to a Transmitter Unit or a Certified Junction Box carry out the following procedure Caution Ensure that the Transmitter Unit Certified Junction Box flamepath is not damaged during this procedure The flamepath is formed by the mating surfaces of the Transmitter Unit Certified Junction Box top and base see the component diagrams in Chapter 3 1 Isolate all associate...

Страница 96: ...n the Transmitter Unit Interconnect PCB Grip the ends of the ZIF and pull it vertically upwards until it is felt to stop and the ribbon cable is loose Refer to the Transmitter Unit installation component diagrams in Chapter 3 5 Pull the ribbon cable clear 6 Remove the support from the Transmitter Unit top Let the metal retaining cable attaching the base and the top hold the top 7 Disconnect the Ce...

Страница 97: ...mitter Unit take care not to damage or strain the ribbon cable connecting the lid and the base The Transmitter Unit top should be aligned using the locating pins on the base and then lowered onto the base The Junction Box base does not have the locating pins Ensure that the lid retaining cable and or wiring are not trapped and the O ring in the top is correctly located Check that there is no disce...

Страница 98: ...l Assembly retaining screws Use a hex key tool to loosen the captive M4 screws 3 Pull the Front Panel Assembly forward away from the top Temporarily refit the M4 hex key tool to one of the retaining screws and gently lever the assembly out of the recess in the top 4 Discard the removed Front Panel Assembly 5 Place the replacement assembly into the recess in the top of the Transmitter Unit 6 Secure...

Страница 99: ...th Certified Sensor can be fitted with any of the cartridges listed in the tables in section A 2 A 1 2 Input Output Power supply 24VDC nominal 18 32V Total power supply loop resistance should be less than 30 ohms with ECC cartridge 16 ohms with Catalytic cartridge Power consumption Relays active 3 6W ECC cartridge 5 6W Catalytic cartridge Relays Three relays A1 A2 and Fault Contact rating 100mA mi...

Страница 100: ...A 0 5mA default 4mA Upper current limited to 22mA Loop resistance 0 300 ohms with a 24V loop supply Fault 0mA nominal 0 0 5mA Inhibit 1mA default user configurable 1 4mA Warning User selectable Either a fixed level 3mA default user configurable between 1 4mA a pulsed current or disabled When the unit is in the warning state a gas reading can still be calculated If the value of this increases beyon...

Страница 101: ...output Digital electronics and software meet the requirements of EN50271 2002 Electrical apparatus for the detection and measurement of combustible gases toxic gases or oxygen Requirements and tests for apparatus using software and or digital technologies Note For performance specification of complete Apex transmitter Sensor Cartridge refer to section A 2 or data sheet for cartridge A 1 5 Environm...

Страница 102: ...29 1992 Degrees of protection provided by Transmitter Unit with enclosures IP code Certified Sensor fitted A 1 9 Configuration The Transmitter Unit can be configured during installation and operation to accept any of the Certified Sensors it is compatible with see the gas cartridge tables in section A 2 A 1 10Certification and Approvals Hazardous Area Certifications Transmitter Unit ATEX II 2 G D ...

Страница 103: ...rovals by CSA Class I Division 1 Groups B C D T4 Tamb 40 to 75 C T5 Tamb 40 to 55 C Certified Sensor approved to CSA C22 2 No 152 only when fitted with specific cartridges See A 2 Cartridges Flammable SG16 US Rest of the world version page 108 CE Marking Complies with EU directives 2004 108 EC Electromagnetic Compatibility Complies with EN 50270 EMC Electrical Apparatus for the Detection and Measu...

Страница 104: ...tridges The Certified Sensor can be fitted with any one of a number of interchangeable cartridges Each replaceable cartridge contains a gas sensing transducer and its calibration manufacturing information It is possible to replace the cartridge without removing the power from the Certified Sensor even in hazardous environments Three types of cartridge are available electrochemical cell catalytic S...

Страница 105: ...omine 0 4ppm 2110B3040 Carbon monoxide 100ppm 2110B3140 Carbon monoxide 200ppm 2110B3150 Carbon monoxide 500ppm 2110B3160 Chlorine 2ppm 2110B3090 Chlorine 5ppm 2110B3100 Chlorine 15ppm 2110B3110 Chlorine dioxide 0 4ppm 2110B3130 Dichlorosilane 10ppm 2110B3430 Ethylene oxide 25ppm 2110B3052 Fluorine 4ppm 2110B3200 Germane 0 8ppm 2110B3210 Hydrogen 1000ppm 2110B3220 Hydrogen bromide 12ppm 2110B3270 ...

Страница 106: ... LEL 2110B3910 2 see note 100 LEL 2110B3911 3 see note 100 LEL 2110B3912 4 see note 100 LEL 2110B3913 5 100 LEL 2110B3914 6 100 LEL 2110B3915 7 100 LEL 2110B3916 8 100 LEL 2110B3917 Butane 100 LEL 2110B3702 Ethylene see note 10 LEL 2110B3787 Ethylene 100 LEL 2110B3708 Hydrogen 100 LEL 2110B3707 LPG 100 LEL 2110B3705 Methane 100 LEL 2110B3704 Propane 100 LEL 2110B3701 Propene 100 LEL 2110B3703 Note...

Страница 107: ...00 LEL 2110B3933 5 2 100 LEL 2110B3934 6 2 100 LEL 2110B3935 7 2 100 LEL 2110B3936 8 2 100 LEL 2110B3937 Butane 2 100 LEL 2110B3752 Ethylene 2 100 LEL 2110B3758 Hydrogen 2 100 LEL 2110B3757 Methane 2 100 LEL 2110B3754 Propane 2 100 LEL 2110B3751 2 Evaluated to CSA C22 2 No 152 Note Cartridge must be used with Apex revised Certified Sensor Part Nos ATEX 2110B2070 UL 2110B2073 CSA 2110B2074 APPENDIX...

Страница 108: ...ter than 5 LEL Warm up Time 30s typical 900s worst case Response Time 2110B3701 Propane T50 8s T90 17s typical 2110B3704 Methane T50 6s T90 11s typical When fitted with standard sensor cap and no filter Linearity Better than 5 LEL or 10 reading whichever is the greater Accuracy Repeatability Better than 3 LEL Stability with Time 3 months 2110B3704 Methane Better than 5 LEL 2110B3701 Propane 6 LEL ...

Страница 109: ...with the sensor cartridges specified in the tables in this section Environmental Operating temperature 40 to 65 C 40 to 149 F Operating humidity 0 99 rh Storage excluding cartridge Temperature 40 to 65 C 40 to 149 F Humidity 0 99 rh EMC Meets the requirements of EN 50270 type 2 apparatus EMC Electrical Apparatus for the Detection and Measurement of Combustible Gases Toxic Gases or Oxygen Enclosure...

Страница 110: ...Tamb 40 to 55 C T135 Tamb 40 to 80 C Certification Number Baseefa08ATEX0253 UL Approvals by UL Class I Division 1 Groups B C D T4 Tamb 40 to 80 C T5 Tamb 40 to 55 C CSA Approvals by CSA Class I Division 1 Groups B C D T4 Tamb 40 to 75 C T5 Tamb 40 to 55 C Junction Box certified to CSA 22 2 No 152 only when certified sensor is fitted with specific cartridges See A 2 Cartridges Flammable SG16 US Res...

Страница 111: ...tion Material Fortron PPS modified Polyphenylene sulphide Size 75mm high x 53mm diameter Weight 60gm Conforms to CSA 22 2 No 152 when fitted to the Certified Sensor with specific cartridges installed See specifications for detail A 3 5 Collecting Cone Material Fortron PPS modified Polyphenylene sulphide Size 127mm high x 160mm wide Weight 120gm Conforms to CSA 22 2 No 152 when fitted to the Certif...

Страница 112: ...d Polyphenylene sulphide Size 75mm high x 53mm diameter Weight 60gm Conforms to CSA 22 2 No 152 when fitted to the Certified Sensor with specific cartridges installed See specifications for detail A 3 5 Collecting Cone Material Fortron PPS modified Polyphenylene sulphide Size 127mm high x 160mm wide Weight 120gm Conforms to CSA 22 2 No 152 when fitted to the Certified Sensor with specific cartridg...

Страница 113: ...bject Diagram Some or all of these may be bound to a LonWorks network Descriptions of each variable are given in the subsequent sub sections For more information consult Honeywell Analytics nviRequest nvoFaultD nvoFaultS nvoStatus Node Object nviResetAlm nvoAlm2 nvoAlmL nvoAlmThresh1 nvoAlmThresh2 nvoCellLife nvoCellType nvoConc nvoConcFS nvoConcType nvoLastCal nvoNextCal Open Loop Sensor Object n...

Страница 114: ...his simple variable of type SNVT_lev_disc can be bound to common LonWorks relays to activate lights or perform shutdown This normally has the value ST_OFF If maintenance is needed soon for example because the cartridge is near the end of its life then this variable will have the value ST_LOW If a serious fault exists that compromises the ability to detect gas then this variable will have the value...

Страница 115: ...will have the value ST_LOW When a level 2 alarm exists the alarm2 relay will be activated and this will produce ST_MED nvoAlm2 output This variable normally has the value ST_OFF When a level 2 alarm exists this will have the value ST_MED This network variable is provide for use with common shutdown relays that are not capable of discriminating between ST_LOW and ST_MED in installations where discr...

Страница 116: ...above nvoConcFS output This floating point number reports the maximum concentration that the installed sensor is capable of measuring The units are the same as nvoAlarmThresh1 see above nvoConcType output This string contains the measurement units for the installed cartridge Possible values include ppm V V and LEL A 4 4 Virtual Function Block The four network configuration inputs appear in a virtu...

Страница 117: ...ntation of nviRequest The object request variable can convey a variety of commands to LonWorks nodes Not all of these messages are applicable to the LIFELINE II The following table lists which of these requests are implemented Blank entries correspond to unimplemented requests Request Node Implementation 0 RQ_NORMAL Enable concentration and alarm reporting 1 RQ_DISABLED Disable concentration and a...

Страница 118: ...6 bits 0 invalid_id object_id 1 invalid_request Unimplemented request made disabled Network reporting inhibited out_of_limits Warning alert active open_curcuit out_of_service Not in normal mode mechanical_fault Fault alert active feedback_failure over_range Concentration full scale under_range electrical_fault unable_to_measure Sensor is not connected comm_failure Error inside LIFELINE II fail_sel...

Страница 119: ... information regarding the product s identification and certification state ATEX UL CLASS I DIV 1 GROUPS B C D OP TEMP CODE T4 Tamb 40 to 80o C T5 Tamb 40 to 55o C CSA CLASS I DIV 1 GROUPS B C D OP TEMP CODE T4 Tamb 40 to 75o C T5 Tamb 40 to 55o C Note Transmitter Unit certified to CSA 22 2 No 152 only when certified sensor is fitted with specific cartridges See B 5 Control Drawings CSA page 126 I...

Страница 120: ...atrix Junction Box Caution Only cartridges with the following part numbers can be fitted to the Certified Sensor 2110B30x0 31x0 32x0 33x0 34x0 35x0 series 2110B3700 2110B3999 range Certified Sensor approved to CSA 22 2 No 152 only when fitted with specific cartridges See B 5 Control Drawings CSA page 126 A certification label is located on the body of the Certified Sensor The label contains all th...

Страница 121: ...TION Identification number of ATEX notified body ATEX Hazardous Area Approval Certificate No Test House Trademark Certificate Code Serial Number Year of Manufacture CE Mark Conforms to all Applicable European Directives Issue Status Manufacturer s Trademark Address Product Name Explosion Protection Mark and Equipment Group and Catagory Certified Ambient Temperature Range ...

Страница 122: ...s of Certified Junction Box ATEX Ex d Part No 2110B2100 UL CSA Explosion Proof Part No 2110B2103 A certification label is located on top of the Certified Junction Box The label contains all the relevant information regarding the product s identification and certification state Identification number of ATEX notified body Test House Trademark Certificate Code Serial Number Year of Manufacture CE Mar...

Страница 123: ... 40 to 55o C CSA CLASS I DIV 1 GROUPS B C D OP TEMP CODE T4 Tamb 40 to 75o C T5 Tamb 40 to 55o C B 4 Accessories The following accessories conform to CSA C22 2 No 152 when fitted to the Certified Sensor with cartridge Part No 2110B3754 installed Collecting Cone Part No 2110B2151 Flow Housing Part No 2110B2140 Weather Housing Part No 2110B2150 Sunshade Part No 2110B2152 ...

Страница 124: ...124 MAN0604_Issue 09_02 2013 Apex 2110M8030 APPENDIX B CERTIFICATION B 5 Control Drawings UL ...

Страница 125: ...ON BOX MAY BE DIRECTLY CONNECTED TO THE CONTROL EQUIPMENT IN THE NON HAZARDOUS AREA 4 SENSOR CARTRIDGES ARE SUPPLIED FROM INTRINSICALLY SAFE CIRCUITS WITHIN THE SENSOR BODY CARTRIDGES MAY THEREFORE BE REPLACED IN THE HAZARDOUS LOCATION WITHOUT NECESSITY OF POWERING DOWN THE APEX SYSTEM FIT ONLY CARTRIDGES PART Nos 2110B3XXX SEE MANUAL SENSOR ENTRY CSA LISTED CONDUIT SEAL REQUIRED WITHIN 18 SENSOR ...

Страница 126: ...Flow Housing 2110B2140 Sunshade 2110B2152 Weather Protection 2110B2150 C 2 Digital Communications Board Description Part Number LonWorks digital communications board 2110B2600 C 3 Spares Description Part Number Carbon filter 2110B2172 Hydrophobic filter 2110B2171 Mesh filter 2110B2170 Sensor cap 2110B2800 Transmitter Unit Front Panel Assembly 2110B2820 CSA Transmitter Unit Front Panel Assembly 211...

Страница 127: ...nslates gas concentration into an electrically measurable quantity such as electrochemical cells catalytic beads and thick film devices LCD Liquid Crystal Display LEL Lower Explosive Limit is the lowest concentration of fuel in air which will burn and for most flammable gases and vapours it is less than 5 by volume Note for some gases e g methane the LEL level has different values in the European ...

Страница 128: ...riving interfacing biasing or signal conditioning circuitry Transmitter A field device that is locally connected to a gas sensing transducer that translates the raw sensor output into a user useful form e g a display 4 20mA or digital output UEL Upper Explosive Limit VOL Concentration of explosive gas measured in percentage by volume V V Another way of representing VOL APPENDIX D GLOSSARY ...

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