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Model 4802A

49

6.7 Engineering Specifications

6.7.1 Zero Two System

Each system shall utilize modules capable of monitoring gas sensing elements, or a 0 to
21.7mA analog signal from gas or flame detection transmitters. The system chassis
shall be available in 4, 8 and 16 channels. Each chassis shall contain a bus for the
following independent signals:

•

A1

Alarm

•

A2

Alarm

•

Fault

•

Master

Reset

•

Master

Accept

•

Unaccept

•

CAL

•

+24Vdc

•

System Common

Module signals shall be capable of being bussed from one chassis to another, so that up
to 100 modules can comprise a single system. The gas and flame detection modules
shall be electrically and physically compatible and capable of being used in the same
chassis to form combined fire and gas detection systems. The system shall consist of
Zero Two Series component modules as manufactured by General Monitors, Lake
Forest California, U.S.A. or General Monitors, Galway, Ireland.

6.7.2 4802A Control Module

The control module, with sensor, shall meet the performance requirements of CSA 22.2
No. 152-M1984 & FM Classes 6310 & 6320. It shall be capable of monitoring 0 to 100%
LEL concentration of combustible gases/vapors. The control module shall have an
interface panel, providing a mode/select switch and the following indications:

•

2 discrete alarm threshold level indicators

•

a “fault” or “malfunction” indicator

•

a “ready” indicator

•

a calibration mode indicator

•

a setup mode indicator

•

a 2 digit digital display

All alarm parameters and user options shall be software selectable. A functional card
test and a front panel LED test shall be switch capable without interrupting normal on-
line services.
The control module shall be capable of insertion and removal during power on
conditions without damage to any component module in the system. The control module
shall meet level 3 for severity and comply with BS 6667 Part 3 / IEC 801-3 for Radio
Frequency Interference (RFI) susceptibility. The control module will generate display
codes associated with fault conditions whenever a fault or malfunction occurs. A
mode/select switch shall provide the operator front panel access to:

•

a calibration check mode

•

a

calibration

mode

•

a setup check mode

•

a setup mode

•

inhibit

mode

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Summary of Contents for 4802A

Page 1: ...sclosed in this document may be used and disseminated only for the purposes and to the extent specifically authorized in writing by General Monitors Instruction Manual 08 05 General Monitors reserves the right to change published specifications and designs without prior notice Part No MAN4802A EU Revision M 08 05 ...

Page 2: ...ms all warranties with regard to the products sold including all implied warranties of merchantability and fitness and the express warranties stated herein are in lieu of all obligations or liabilities on the part of General Monitors for damages including but not limited to consequential damages arising out of or in connection with the use or performance of the product Warnings WARNING COMBUSTIBLE...

Page 3: ...0 c Conforms to EN50270 1999 as tested by ITS Testing Certification Cleeve Road Leatherhead Surrey KT22 7SB Report No EM02006611 This declaration shall cease to be valid if modifications are made to the equipment without our approval PRODUCT Control Module for Combustible Gas Applications MODEL 4802A It is ensured through internal measures and our ISO9001 1994 certifications that series production...

Page 4: ...ty system verify that all signal outputs to and from devices and modules are within the manufacturers specifications Initial calibration calibration checking testing should be performed per the manufacturers recommendations and instructions Proper system operation should be verified by performing a full functional test of all component devices of the safety system ensuring that the proper levels o...

Page 5: ...ices Signaling output devices Accessories connected to field and signaling devices Proper system operation should be verified by performing a full functional test of all component devices of the safety system ensuring that the proper levels of alarming occur Fault Malfunction circuit operation should be verified Calibration intervals should be independently established through a documented procedu...

Page 6: ...ccessible for calibration checks Ensure that sufficient clearance exists to allow the use of field calibration devices The sensor head should always be pointing down to prevent water build up on the sensing element Remember that some combustible gases are heavier than air however do not rely too heavily on this fact when selecting a sensor position The sensor should be located in areas where leaks...

Page 7: ... that the individual coding strips match the channel application The coding strips are pre configured at the factory and the male portion is already on each module The female portion if un mounted must be fastened into position on the mounting strip of the desired chassis channel so as to mate with its counterpart on the module see Figure 1 Figure 1 Control Module Coding Strip NOTE Zero Two series...

Page 8: ...wire 14 AWG wire may be used if it is properly stripped according to Figure 2 Figure 2 Wire Strip Length CAUTION Contact with PC Board components should be avoided in order to prevent damage by static electricity To connect wires to the terminal block on the Model 4802A loosen the desired screw insert the stripped end of the wire and tighten For the rear terminal designations refer to Figure 3 bel...

Page 9: ...nd closed A2 alarm relay contacts while the unit is on power Figure 5 A2 Alarm Relay Contacts 1 5 2 A1 Alarm The terminal designations for the A1 Alarm outputs are Label Term Description A1 C1 2z Relay Common 1 2 A1 1 4z Relay Contact A1 2 6z Relay Contact A1 3 8z Relay Contact A1 4 10z Relay Contact A1 C2 12z Relay Common 3 4 A1 OC 14z Open Collector OC LA1 24d OC Logic for A1 LED Figure 6a A1 Al...

Page 10: ... The Fault outputs are SPDT relays 1 open collector output F OC that follows the logic of the relays and 1 open collector output FUA dedicated to new fault indications NOTE If the Backward Compatible configuration is ordered the FUA will not be present pin 32d will be for B The Fault outputs are always normally energized when power is applied to the module The contact ratings for the A2 A1 alarm a...

Page 11: ...ut CAL INH 32z CAL Inhibit Mode Output Figure 9 Terminal Designations for Unaccept and Calibration Inhibit Mode Outputs NOTE If the Backward Compatible configuration is ordered the CAL INH will not be present pin 32z will be for 0v The electrical rating for all open collector outputs is 100mA 35Vdc Figure 10 illustrates some typical open collector external circuits Figure 10 Open Collector Externa...

Page 12: ...r Wire WHT 30d z White Sensor Wire Figure 11 Terminal Designations for Sensor Wires NOTE Only 1 sensor may be connected to a Model 4802A Figure 12 illustrates the Sensor Controller connections Figure 12 Sensor Controller Connections 1 5 6 Card Test Switch The terminal designation for the Card Test Input is Label Term Description CT 16d Switch Connection Figure 13 Card Test Input ...

Page 13: ...on The other end is connected to system common To activate the feature simply press and hold the switch for as long as the test time is to be run 1 5 7 Analog Output Signal The terminal designations for the Analog Output Signal are Label Term Description AO 20d Analog Signal plus AO 22d Analog Signal minus Figure 15 Terminal Designations for Analog Output NOTE If the Analog Signal is not used a ju...

Page 14: ...of modules in the system as well as the number and type of field devices NOTE If the application of power does not turn ON the unit check fuse F1 on the control board NOTE If the unit displays an F4 condition upon power up first try to clear this condition by calibrating the sensor If this condition persists replace the sensor Figure 17 indicates where the power connections for the chassis are mad...

Page 15: ...e Troubleshooting Section or call the factory direct Worldwide Service is available by calling Lake Forest California Phone 1 949 581 4464 24 hr service Fax 1 949 581 1151 Houston Texas Phone 1 281 855 6000 Fax 1 281 855 3290 Ireland Phone 353 91 751175 Fax 353 91 751317 Singapore Phone 65 6748 3488 Fax 65 6748 1911 United Arab Emirates Phone 971 4 8815751 Fax 971 4 8817927 United Kingdom Phone 44...

Page 16: ...2 Alarm viii 1 5 2 A1 Alarm viii 1 5 3 Fault Alarm ix 1 5 4 Other Open Collector Outputs x 1 5 5 Sensor Connections xi 1 5 6 Card Test Switch xi 1 6 Applying Power xiii Table of Contents xv Table of Figures xix 2 0 Introduction 1 2 1 General Description 1 2 2 Features Benefits 2 2 2 1 Automatic Calibration 2 2 2 2 Calibration Check Mode 2 2 2 3 Calibration Level 2 2 2 4 Microprocessor Based Electr...

Page 17: ...tenance 14 4 2 Electrical Inputs 14 4 3 Electrical Outputs 14 4 4 Accepting Alarm Conditions 15 4 5 Resetting Latched Alarms 16 4 6 CAL INH Open Collector 16 4 7 Card Test Feature 17 4 8 Fault Diagnostics 17 4 8 1 F1 Open analog output signal 17 4 8 2 F2 Failed to complete calibration 17 4 8 3 F3 Software checksum error 17 4 8 4 F4 Sensor connections are open or short circuited or there is excessi...

Page 18: ... 6 2 5 Duct Mounting Plates 41 6 2 6 Calibration Equipment 42 6 2 7 Calibration Check Mode 43 6 2 8 Calibration Mode 43 6 2 9 Calibration Check Calibration Modes 43 6 2 10 Calibration Equipment and Part Numbers 44 6 2 10 1 Portable Purge Calibrator Assembly 44 6 2 10 2 Portable Purge Replacement Cylinder 44 6 2 10 3 Replacement Parts 44 6 2 10 4 Cylinder Refills 44 6 2 10 5 3 Liter Chamber Replace...

Page 19: ...47 6 5 3 Relay Contact Rating 47 6 5 4 Open Collector Rating 47 6 5 5 Cable Parameters 47 6 6 Environmental Specifications 48 6 6 1 Operating Temperature Range 48 6 6 2 Storage Temperature Range 48 6 6 3 Pressure Limits 48 6 6 4 Operating Humidity Range 48 6 7 Engineering Specifications 49 6 7 1 Zero Two System 49 6 7 2 4802A Control Module 49 6 8 Volatile Liquids and Solvents 51 6 9 Engineering T...

Page 20: ...for A2 Alarm Outputs 5 Figure 23 A2 Alarm Relay Contacts 5 Figure 24 Terminal Designations for A1 Alarm Outputs 6 Figure 25 A1 Alarm Relay Contacts 6 Figure 26 Terminal Designations for Fault Outputs 6 Figure 27 Recommended Relay Protection Circuits 7 Figure 28 Terminal Designations for Unaccept and Calibration Inhibit Mode 7 Figure 29 Open Collector External Circuits 8 Figure 30 Terminal Designat...

Page 21: ...t 33 Figure 61 Password Enabled Disabled Option 34 Figure 62 Entering A New Password 35 Figure 63 Catalytic Sensor Diagram 37 Figure 64 Universal Sensor Housing With Sensor And Splash Guard 39 Figure 66 Splash Guard Picture 40 Figure 67 Dust Guard Picture 40 Figure 68 Dust Guard Assembly Kit Picture 41 Figure 69 Duct Mounting Plate Assembly Drawing 41 Figure 70 Portable Purge Calibrator 42 Figure ...

Page 22: ...ure 18 is a single channel Combustible Gas detection Control Module designed for use in Zero Two Series Gas and Flame Detection Systems This Module connects to the wires from a field mounted General Monitors Catalytic Bead Sensor and monitors the presence of combustible gases and vapors The Model 4802A is electrically and physically compatible with the other gas detection flame detection and syste...

Page 23: ...revents unauthorized alteration of the setup parameters can be disabled 2 2 7 Setup Check Mode Allows the user to view the parameters that have been set by the factory and or an operator 2 2 8 LED Test Tests the integrity of each LED and each segment of the digital display on the front panel 2 2 9 Card Test Tests the functionality of the card through the microprocessor ramping the signal from 0 to...

Page 24: ...is necessary upon initial installation and start up to ensure system integrity 3 2 Control Module Installation A rack or panel mounted chassis will be required when installing any Zero Two Series Module These chassis should be mounted in non hazardous weather protected locations and should be subjected to minimal shock and vibrations The rack and panel mounted chassis are available in 4 8 and 16 c...

Page 25: ...of 10 FSD This deviation will disappear following removal of the field Functionality is otherwise unaffected 3 3 Rear Terminal Connections All wire connections to the Model 4802A are made to the terminal block located at the rear of the chassis The terminal block accepts 16 AWG to 20 AWG 1 5mm2 to 0 75mm2 stranded or solid core wire 14 AWG wire may be used if it is properly stripped according to F...

Page 26: ...esignation is common for A2 3 A2 4 The normally open NO and normally closed NC contacts depend on a user selectable option see Chapter 5 The table below refers to the proper open and closed A2 alarm relay contacts while the unit is on power User Selected Relay State Normally Open Normally Closed Normally Energized A2 C1 A2 1 A2 C2 A2 4 A2 C1 A2 2 A2 C2 A2 3 Normally De Energized A2 C1 A2 2 A2 C2 A...

Page 27: ...nd on a user selectable option see Chapter 5 The table below refers to the proper open and closed A1 alarm relay contacts while the unit is on power User Selected Relay State Normally Open Normally Closed Normally Energized A1 C1 A1 1 A1 C2 A1 4 A1 C1 A1 2 A1 C2 A1 3 Normally De Energized A1 C1 A1 2 A1 C2 A1 3 A1 C1 A1 1 A1 C2 A1 4 Figure 25 A1 Alarm Relay Contacts 3 3 3 Fault Alarm The terminal d...

Page 28: ...d contact damage Figure 27 shows recommended relay protection circuits for AC and DC loads respectively Figure 27 Recommended Relay Protection Circuits 3 3 4 Other Open Collector Outputs The terminal designation for the Unaccept and the Discrete Calibration Inhibit Mode outputs are Label Term Description UA OC 18d Unaccept Output CAL INH 32z CAL Inhibit Mode Output Figure 28 Terminal Designations ...

Page 29: ...tor External Circuits 3 3 5 Sensor Connections The terminal designations for the Sensor wires are Label Term Description BLK 26d z Black Sensor Wire RED 28d z Red Sensor Wire WHT 30d z White Sensor Wire Figure 30 Terminal Designations for Sensor Wires NOTE Only 1 sensor may be connected to a Model 4802A ...

Page 30: ...for Card Test Input Figure 33 is a block diagram that shows the switch connections for the Card Test feature Figure 33 Switch Connections for Card Test Feature The Card Test Input is provided so that the user can access the Card Test feature remotely One end of a normally open SPST switch is connected to this termination The other end is connected to system common To activate the feature simply pr...

Page 31: ...rminal Designations for Analog Output NOTE If the Analog Signal is not used a jumper must be placed between 20d 22d Figure 35 is a diagram of the Analog Signal connections Figure 35 Analog Signal Connections Figure 36 indicates where the power connections for the chassis are made Do not daisy chain 24V and Common on chassis Apply separate power to each chassis Figure 36 Power Connections ...

Page 32: ...ay be adversely affected by prolonged exposure to certain atmospheres The more important poisons are Prolonged exposure to Hydrogen Sulfide H2S Gas Halides compounds containing Fluorine Chlorine Bromine and Iodine Heavy Metals e g Tetraethyl lead Silicones contained in greases or aerosols are the most common coating agents These are not true sensor poisons but reduce sensor response Other damaging...

Page 33: ...mps on any junction box or housing wiring terminals Poor crimping can cause bad connection when unit experiences temperature variations We therefore recommend good practice is to just terminate cable or sensor wires as is especially in remote sensor applications Complete all cable insulation testing before connecting the cable at either end Gas Sensor Nut Drain Wire Isolated here Continuity Plate ...

Page 34: ...ring the junction box must be terminated on the SCReen terminal to isolate it from all other circuits It must not be connected to the sensor circuitry at any point Connect the external earth stud in accordance with local practices if required Screw the lid down tightly to the base in order to ensure electrical continuity ...

Page 35: ...led periodic checks of the setup parameters should be performed 4 2 Electrical Inputs There are two electrical inputs to the Model 4802A They are the General Monitors Catalytic Bead Sensor field device and Card Test input Both of these input connections sensor and card test are made to the rear terminal block see Chapter 3 for more detailed installation information The Catalytic Bead Sensor input ...

Page 36: ...r pair of digits When the Model 4802A enters into a fault condition a 0mA signal is generated by this output During a fault the display will indicate a fault code F followed by a digit If the sensor attached to the Model 4802A is seeing gas in excess of 100 of full scale this output will generate a signal between 20 and 21 7mA not proportional An over range condition is indicated by a flashing dig...

Page 37: ...lly A latched alarm output needs to be reset manually Resetting latched alarm outputs is accomplished with the Master Reset Button located on the Facilities Module FM002A Pressing the Master Reset Button will reset any latched conditions that are no longer valid NOTE Latched alarm conditions cannot be Reset until they have been Accepted see Section 4 4 EXAMPLE The sensor detects a gas concentratio...

Page 38: ... front panel the Model 4802A provides a fault code on the digital display whenever a fault condition occurs The Fault Codes that can appear on the digital display are summarized below 4 8 1 F1 Open analog output signal Check connections on rear terminal pins 20d 22d 4 8 2 F2 Failed to complete calibration If this fault occurs remove the gas and allow the sensor to see clean air for at least five m...

Page 39: ...he calibration checks gas is left on the sensor for more than 6 minutes this fault will occur Remove the gas and allow the sensor to see clean air In each of the fault cases listed on this page when the fault occurs the FUA output is activated Pressing the ACCEPT button on the Facilities Module FM002A will acknowledge the fault de activate the FUA output and the fault LED will stop flashing and re...

Page 40: ... the Model 4802A in the performance of its various functions User interfaces Figure 38 consist of a digital display status indicators and a Mode Select switch The digital display provides the user with the gas concentration at the sensor site fault diagnostic codes calibration prompts and setup parameters The status indicators provide the user with an indication of the current mode of operation al...

Page 41: ...r to the sensor until display shows a flashing Zero Figure 39 Portable Purge Calibrator The Calibration Check Mode cannot be entered if the 4802A is in alarm 2 Enter the Calibration Check mode by pressing and holding the Mode Select switch until the CAL LED begins to flash about ten seconds When the CAL LED begins to flash release the Mode Select switch The unit is now in the Calibration Check Mod...

Page 42: ... accessories 7 The operator should compare the reading with the gas concentration applied and determine if it is necessary to calibrate the sensor 8 The A1 A2 alarms are disabled during the Calibration Check Mode Use the Setup Check Mode to verify the alarm set points for A1 and A2 9 If the reading is acceptable remove the gas and allow the sensor to see clean air 10 If the operator determines tha...

Page 43: ... the cup from the portable purge calibrator over the sensor Figure 41 NOTE Do not attach cup from the portable purge calibrator over the sensor until the display shows AC Figure 41 Portable Purge Calibrator 4 Enter the Calibration mode by following the procedure for entering the Calibration Check mode continuing to press and hold the Mode Select switch until the CAL LED turns on steady about fifte...

Page 44: ...nit is now in the Calibration Mode Figure 43 Figure 43 AC Display During CAL Mode Apply the gas by opening the valve on the cylinder and the ON OFF valve and watch the display change from AC to CP as the sensor sees gas Figure 44 If the display does not change from AC to CP after six minutes the Model 4802A will return to normal operation Figure 44 CP Display During CAL Mode ...

Page 45: ...e display return to normal operation 0 when the new calibration values have been stored in the EEPROM If the unit cannot store the new calibration values in the EEPROM the Model 4802A will display an F7 fault code EEPROM verification failure Figure 46 If an F7 calibration fault occurs it will be necessary to replace the Model 4802A If the Model 4802A fails to calibrate the unit will use the previo...

Page 46: ...is the same for most of the options Pressing the Mode Select Switch toggles the available choices When the display has indicated a choice for five consecutive seconds without the operator pressing the Mode Select Switch the Setup routine will accept that selection and move on to the next option available NOTE Before entering the Setup Mode to make changes the user should fill out the form and beco...

Page 47: ...ed and then wait about five seconds The left digit of the display will then blank out and a 0 will appear in the right digit on the display Figure 48 Press the Mode Select switch until your correct password number is displayed then wait about five seconds If the password is correct the unit will proceed to the inhibit option If the password is incorrect the user will not be able to proceed and the...

Page 48: ...ate In for five seconds Figure 49 Pressing the Mode Select switch while In is displayed will cause the unit to enter the Inhibit mode by inhibiting the alarm outputs As the unit enters the Inhibit mode the Model 4802A will automatically return to normal operation If it is desired to enter the Setup Mode do not press the Mode Select switch for the five seconds that In is displayed Figure 49 Enterin...

Page 49: ...e selection De Energized is the factory default for this selection Figure 50 A2 Energized De Energized Alarm Option The A2 LED on the front panel will be flashing while the latching non latching option is displayed Figure 51 The display will indicate the current selection nL or LA Press the Mode Select Switch to toggle the selection Latching is the factory default for this selection Figure 51 A2 L...

Page 50: ... in increments of 5 Press the Mode Select switch repeatedly until the desired A2 alarm set point appears on the display 60 is the factory default for this selection Figure 52 A2 Alarm Set Point Option NOTE The A2 set point cannot be set lower than the current A1 set point To accomplish this you will need to go through Set up twice The A1 set point should be set lower than the desired A2 set point ...

Page 51: ...selection De Energized is the factory default for this selection Figure 53 A1 Energized De Energized Alarm Option The A1 LED on the front panel will be flashing while the latching non latching option is displayed Figure 54 The display will indicate the current selection nL or LA Press the Mode Select Switch to toggle the selection Non Latching is the factory default for this selection Figure 54 A1...

Page 52: ...play 10 to the A2 set point in increments of 5 The A1 set point cannot be set higher than the A2 set point 30 is the factory default for this selection Figure 55 A1 Set Point Option 5 4 5 Calibration Level Option After the A1 alarm options have been selected the user will choose the calibration level Figure 56 The CAL LED will flash and display will indicate current calibration level The acceptabl...

Page 53: ...ate the Fault circuit while the unit is in the Inhibit Mode A nA selection specifies that the Model 4802A will not activate its Fault circuit when the unit is placed in the Inhibit Mode A nA selection will not disable the Fault circuit therefore if a Fault occurs during the Inhibit Mode the unit will activate the Fault circuit Not Active is the factory default for this selection Figure 57 Fault In...

Page 54: ...display will indicate ct for about five seconds Figure 58 followed by the ramp up time 3 or 10 during the card test Figure 59 3 is the factory default for this selection Figure 59 Card Test Ramp Time Next the display will indicate the alarm output option during a Card Test as either Ac active or nA not active Figure 60 Not Active is the factory default for this selection Figure 60 Alarm Output Dur...

Page 55: ... disabled the unit will return to normal operation If the Password is enabled the user will be able to enter a new password Figure 62 The unit will display the left digit of the existing Password flashing on the display The right digit will be blank until the left digit has been selected Press the Mode Select switch repeatedly until the desired value is displayed Once the left digit is correct wai...

Page 56: ...ero NOTE Any latched alarms must be reset before exiting the Inhibit Mode There is a user selectable option that will place the unit in Fault every time the Inhibit Mode is entered If the user does not select this option the Fault circuit will function normally during the Inhibit Mode While the unit is in the Inhibit Mode the display will indicate IN for 5 seconds then the gas concentration will b...

Page 57: ...e Latching LA Non Latching nL Option Set the A2 alarm set point from 10 to 60 in increments of 5 Set the Energized En De Energized dE Option Set the Latching LA Non Latching nL Option Set the A1 alarm set point from 10 to 60 in increments of 5 The A1 Set Point cannot be higher than the A2 Set Point Set the calibration level LEL from 25 to 90 in increments of 1 Set the Fault Activate Ac or not nA d...

Page 58: ... reference bead and the other bead is the active bead Figure 63 Environmental factors can also influence the temperature of the catalytic beads Because the beads are matched pairs they will respond to changes in ambient temperature humidity and pressure equally By connecting one end of each catalytic bead together a series circuit is formed This circuit is supplied with a constant current The volt...

Page 59: ...del 4802A 6 2 1 Sensors General Monitors offers a variety of Catalytic Bead Sensors with sensor bodies and flame arrestors 11159 1 Stainless steel CSA ATEX GOST approved 120ºC max 11159 2 Stainless steel CSA ATEX GOST approved 180ºC max 11159 1L Standard industrial hydrocarbon w lugs stainless steel ATEX 11159 2L High temperature hydrocarbon w lugs stainless steel ATEX ...

Page 60: ...o one of these entries while the other entry is for conduit runs The lid of the housing is also threaded to allow the user to gain entry to the sensor connections in the field Figure 64 Universal Sensor Housing With Sensor And Splash Guard Figure 65 NPT 45160 2 GRP Junction Box M20 INSTRUCTIONS BEFORE OPERATING OR READ AND UNDERSTAND SERVICING CAUTION GENERAL MONITORS CALIFORNIA USA DO NOT OPEN WH...

Page 61: ...o the sensor cavity and affecting the response of the sensing element Constructed of rugged Valox plastic it has a series of internal baffles to deflect water down and away from the sensor This guard and the TGA 1 is threaded for simple screw on installation The Splash Guard and TGA 1 are recommended for outside applications where rain or frequent hose downs occur such as offshore platforms Figure...

Page 62: ...ate is easy to install Figure 69 Figure 69 Duct Mounting Plate Assembly Drawing Read and understand the bulleted list below before mounting the Sensor into a duct Select a location on the duct and cut out a hole large enough for the Sensor to be inserted into the duct Place the O Ring over the Sensor threads against the 1 inch hex on the wiring side of the sensor Insert the wiring side of the Sens...

Page 63: ...e 71 is explained below The 3 Liter Chamber is used when the 4802A is calibrated with liquid or solvent vapors Before the Model 4802A is calibrated with any solvent or volatile liquid consult the listing in Appendix B to determine the volume of solvent liquid required to produce a 50 LEL concentration in the 3 Liter Chamber However if the user specified calibration level is not 50 LEL consult the ...

Page 64: ...alibration Chamber 2 As the sensor begins to respond to the combustible vapor in the chamber the concentration will begin flashing on the display 3 The reading will stabilize after one or two minutes 4 Remove the sensor from the chamber and allow it to see clean air When the display has stopped flashing and indicates a few LEL and then zero 0 the Model 4802A has returned to normal operation 6 2 8 ...

Page 65: ...ith 50 LEL Butane Gas 1400155 B with 50 LEL Ethane Gas 1400155 E with 50 LEL Ethylene Gas 1400155 EY with 50 LEL Propane Gas 1400155 P 6 2 10 3 Replacement Parts Small Calibration Cup 1400152 1 Large Calibration Cup 1400154 Pressure Gauge Regulator 922 009 Methane Gas 50 LEL 140155 M Hydrogen 50 LEL 140155 H Butadine Gas 50 LEL 140155 BD Butane Gas 50 LEL 140155 B Ethane Gas 50 LEL 140155 E Propan...

Page 66: ...librate the system For many combustible gases obtaining a high accuracy standard that is suitable for field calibration use may be difficult about the best accuracy of gas concentration achievable is 5 using a permeation system with good temperature control For this reason no fixed accuracy statement is possible The accuracy cannot be better than the accuracy of the calibration gas The best accura...

Page 67: ...eration For optimal sensor performance the Oxygen level during calibration should be consistent with the expected normal ambient atmosphere The presence of certain gases and vapors may interfere with sensor operation General Monitors has tested and documented some of the known interferents These include but are not limited to low vapor silicon H2S heavy hydrocarbons and light chlorinated products ...

Page 68: ...pen Collector Rating 100mA 35Vdc for A1 A2 Fault UA FUA CAL OC LA1 LA2 6 5 5 Cable Parameters Recommended 3 wire screened or screened and armoured per BS5308 or equivalent Maximum cable lengths allowable between module and sensor with one way resistance of 5 Ohms per sensor lead 10 Ohms loop mm2 AWG Feet Meters 2 5 14 7600 2320 1 5 16 4800 1460 1 0 18 3000 910 75 20 1900 580 Figure 72 Recommended ...

Page 69: ... F 40 C to 120 C Sensor 11159 2 40 F to 356 F 40 C to 180 C 4802A 0 F to 150 F 18 C to 66 C 6 6 2 Storage Temperature Range 4802A 40 F to 150 F 40 C to 66 C 6 6 3 Pressure Limits 1 2ATM to 3ATM with no impact on performance or operation 6 6 4 Operating Humidity Range 5 to 100 Relative Humidity non condensing ...

Page 70: ...mance requirements of CSA 22 2 No 152 M1984 FM Classes 6310 6320 It shall be capable of monitoring 0 to 100 LEL concentration of combustible gases vapors The control module shall have an interface panel providing a mode select switch and the following indications 2 discrete alarm threshold level indicators a fault or malfunction indicator a ready indicator a calibration mode indicator a setup mode...

Page 71: ...ontrol module with sensor shall be capable of calibration with the following display prompts during the calibration routine AC Calibration routine activated CP Calibration in progress and CC Calibration complete The control module shall have a password protected setup routine capable of having the password disabled ...

Page 72: ... 112 Acetonitrile 96 Acrylonitrile 120 Amyl Acetate 100 Benzene 65 Butyl Acetate 137 Butyl Alcohol 1 Butanol 78 sec Butyl Alcohol 2 Butanol 95 tert Butyl Alcohol 138 Butyraldehyde 102 Cyclohexane 86 Diethyl Ketone 3 Pentanone 103 p Dioxane 104 Ethanol Ethyl Alcohol 118 Ethyl Acetate 119 Ethyl Amine 140 Ethyl Benzene 60 Ethyl Ether 120 Gasoline 107 Heptane 94 Hexane 86 Isopentane 2 Methylbutane 99 ...

Page 73: ...Model 4802A 52 6 9 Engineering Technical Drawings 6 9 1 Outline Terminal Connections Reference Drawing 11221 Figure 74 Outline and Terminal Connections 4802A ...

Page 74: ...Model 4802A 53 6 9 2 Final Assembly Reference Drawing 11220 1 Figure 75 Final Assembly 4802A ...

Page 75: ...A502A 3 DIGIT Zero Two Series 3 Digit A flexible multipurpose module for a variety of GM products Model FM002A Zero Two Series Facilities Module Performs Common Functions for Zero Two Systems Model RL002 Zero Two Series Relay Module Provides Extra Output Capacity for Zero Two Systems Model ZN002A Zero Two Series Zone Control Module Performs Zoning and Voting Functions for Zero Two Systems Model MD...

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