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© 2018 All rights reserved. Data subject to change without notice. 

LPT-P - Operation Manual 

Rev. B | 2018.08

6.7.3 Modbus® Holding Registers 

If you ha

ve specifi c requirements, have any questions or require clarifi cation about the Modbus® 

holding registers, please contact CETCI for assistance. 
 

6.8 Setting Channel Alarm Setpoints

The LPT-P is confi gurable as a one, two or three channel gas detector and each channel has three 
gas alarm setpoints, LOW, MID and HIGH which can be ascending or descending. The number 
entered as the setpoint is the exact number at which the gas concentration reading will be 
determined as being LOW, MID or HIGH. The information will be read by the Controller or BAS and 
the appropriate safety measures, such as triggering a relay(s), sounding an alarm, etc. will occur as 
programmed into the Controller or BAS.

Almost all installations will use the factory default alarm setpoints. The default setpoints are:

SENSOR GAS TYPE

LOW ALARM

MID ALARM

HIGH ALARM

Carbon Monoxide (CO)

25 ppm

50 ppm

100 ppm

Nitrogen Dioxide (NO

2

)

0.7 ppm

1.0 ppm

1.5 ppm

Combustibles (catalytic)

10% LEL

15% LEL

20% LEL

NOTE:

 If Channel 1 is not being set, follow the same steps using Channel 2 and/or Channel 3.

6.8.1 Setting the Low Alarm Setpoint

In the Sensor Confi guration Menu (passcode 3032), press either ARROW key to scroll through the 
menu and select the channel for which you are setting the alarm setpoint. 

Содержание LPT-P

Страница 1: ...Operation Manual www critical environment com LPT PDigital Car Park Transmitter Rev B 2018 08 ...

Страница 2: ... 2 1 General Description 9 2 2 Key Features 10 3 INSTRUMENT SPECIFICATIONS 11 3 1Technical Specifications 11 3 2 Internal Sensor GasTypes 13 3 3 ESH A Remote Sensor GasTypes 13 3 4 Enclosure Dimensions 14 4 INSTRUMENT FEATURES 15 4 1 Exterior Enclosure 15 4 2 Interior System Layout 17 5 INSTALLATION 18 5 1 General SafetyWarnings 19 5 2 Protection Against Electrical Risks 19 5 3 Protection Against ...

Страница 3: ... SYSTEM OPERATION CONFIGURATION 27 6 1 Navigating the Menu Structure 27 6 2 Accessing the Menu with Passcodes 28 6 3 Power Up andWarm up 29 6 4 Display Select 30 6 5 Set LCD Display Contrast Level 31 6 6 Fault Detection 31 6 7 Modbus Settings 32 6 7 1 Change Modbus ID 32 6 7 2 Change Modbus Baud Rate 33 6 7 3 Modbus Holding Registers 34 6 8 Setting Channel Alarm Setpoints 34 6 8 1 Setting the Low ...

Страница 4: ...oubleshooting Calibration 43 7 3 1 Calibration Adapter Plug 44 7 3 2 Zero Calibration Shift 44 7 3 3 Zero Requires Override 44 7 3 4 Span Requires Override 44 7 3 5 Fault Reading 45 7 3 6 Calibration Failure 45 7 4 Calibrating an ESH A Remote Sensor Connected to an LPT P 46 7 4 1 Zero and Span Calibration of a Responsive ESH A Remote Sensor 46 7 4 2 Zero Calibration of a New or Replacement ESH A R...

Страница 5: ...ng to instructions indicated in this manual This instrument should be inspected and calibrated regularly by a qualified and trained technician For more information refer to Section 7Calibration and Section 9Maintenanceof this manual This instrument has not been designed to be intrinsically safe For your safety do not use it in classified hazardous areas explosion rated environments INSTRUMENT SERI...

Страница 6: ...acturer is not liable for auxiliary interfaced equipment or consequential damage Due to ongoing research development and product testing the manufacturer reserves the right to change specifications without notice The information contained herein is based on data considered accurate However no warranty is expressed or implied regarding the accuracy of this data All goods must be shipped to the manu...

Страница 7: ...nnot be held responsible for any damage incurred during shipping to our facility You will be contacted with a cost estimate for expected repairs prior to the performance of any service work For liability reasons CETCI has a policy of performing all needed repairs to restore the instrument to full operating condition 1 4 Copyrights and Registered Trademarks This manual is subject to copyright prote...

Страница 8: ...sentation expressed or implied including any warranty of merchantability or fitness for purpose with respect to this manual All information contained in this manual is believed to be true and accurate at the time of printing However as part of its continuing efforts to improve its products and their documentation the manufacturer reserves the right to make changes at any time without notice In add...

Страница 9: ... single channel gas detector with an internal electrochemical Carbon Monoxide CO or Nitrogen Dioxide NO2 sensor A dual channel gas detector with an internal electrochemical Carbon Monoxide CO and Nitrogen Dioxide NO2 sensor A dual channel gas detector with an internal electrochemical Carbon Monoxide CO plus one catalytic ESH A Remote Sensor A dual channel gas detector with an internal Nitrogen Dio...

Страница 10: ...reading through the manual you have any questions please do not hesitate to contact our service department for technical support 2 2 Key Features Up to 3 sensor configurations single or dual internal CO or NO2 sensor and or one remote catalytic combustible gas sensor Modbus RS 485 RTU serial communications Graphic LCD display user selectable function 4 conductor shielded network wiring daisy chain...

Страница 11: ... 71 mm 5 0 x 5 0 x 2 8 ELECTRICAL Power Requirement 16 30VDC 3W Class 2 24V recommended See Section 5 6WiringConnections Wiring 4 wire 24VDC 4 conductor shielded 16 awg stranded within conduit network wiring daisy chain Fuses Automatic resetting thermal USER INTERFACE Display Graphic LCD white border Text prompting for calibration operation and fault indications Installer configurable to suppress ...

Страница 12: ...input signal from ESH A Remote Sensor ENVIRONMENTAL OperatingTemperature 20 C to 40 C 4 F to 104 F Operating Humidity 15 90 RH non condensing CERTIFICATION Model LPT P XXX S N LPTP1603B00001 Rating 16 30VDC 3W Class 2 CERTIFIED FOR ELECTRIC SHOCK ELECTRICAL FIRE HAZARD ONLY LA CERTIFICATION ACNOR COUVRE UNIQUEMENT LES RISQUES DE CHOC ELECTRIQUE ET D INCENDIE D ORIGINE ELECTRIQUE Conforms to CSA C2...

Страница 13: ... interference received including interference that may cause undesired operation 3 2 Internal Sensor Gas Types Internal Electrochemical Sensors Part Number Range Lifespan Carbon Monoxide CO LPT P TCO 0 200 ppm 6 years Nitrogen Dioxide NO2 LPT P NO2B 0 10 ppm 6 years 3 3 ESH A Remote Sensor Gas Types ESH A Remote Sensors Combustible Catalytic Part Number Range Lifespan Hydrogen H2 ESH A CH2 100 0 1...

Страница 14: ...are shown with optional splash guard Without splash guard thickness is 71 mm 2 8 The area required for enclosure door to be open 90 degrees is 178 mm 7 0 or 254 mm 10 0 for fully open With the optional splash guard installed the enclosure is IP54 rated NOTE During calibration the sensor response time will be slower with a splash guard installed ...

Страница 15: ...erved Data subject to change without notice 15 Rev B 2018 08 LPT P Operation Manual 4 INSTRUMENT FEATURES 4 1 Exterior Enclosure Œ Œ Ž Side view of LPT P showing location of Magnetic Sensors Ž Ž Ž ARROW UP ENTER ARROW DOWN ...

Страница 16: ...door to base and allows easy opening and closing Display with white border Graphic LCD display Ž Magnetic Switches arrow up Enter arrow down Use a magnetic wand to access menu options and program functions without opening the enclosure Sensor Opening Allows gas diffusion into sensor Door Screw Secures door shut Padlock Opening For security padlock ...

Страница 17: ...08 LPT P Operation Manual 4 2 Interior System Layout NUMBER FEATURE FUNCTION Œ Programming Buttons Access menu options and program functions using buttons inside the enclosure Arrow up Enter Arrow down Remote SensorTerminal Terminal for connecting the ESH A Remote Sensor Œ Ž Œ Œ ...

Страница 18: ...ce is not installed within two weeks of delivery the sensors may require a longer warm up time to stabilize approximately 48 hours and provide accurate readings NOTE CETCI suggests that upon power up all sensors be left to warm up for 24 hours prior to considering the gas readings to be accurate NOTE All sensors are calibrated in the factory and do not require calibration at the time of a routine ...

Страница 19: ... no serviceable elements other than the calibration instructions outlined in this manual There are no replaceable components except the sensors 5 2 Protection Against Electrical Risks Disconnect all power before servicing There may be multiple power sources Power supply may have a building installed circuit breaker switch that is suitably located and easy to access when servicing is required and s...

Страница 20: ...on the base should snap apart from the part of the hinges located on the door After installation simply locate the lid hinges over the installed base hinges and pull toward you The hinges should easily snap back into place The enclosure has one screw securing the door to the base for electrical safety and provides an opening to allow the user to apply a padlock or tie wrap if they desire the trans...

Страница 21: ...pplication whereby liquid could be directed towards the sensor opening the LPT P should be ordered with an optional attached splash guard factory installed If used in a wet or wash down application the conduit hub entering the LPT P enclosure must be liquid tight type Any water or physical damage to the transmitter that occurs from the installer drilling their own installation holes will not be co...

Страница 22: ...ting height depends on the density of the gas relative to air Heavier than air gases should be detected 6 in 15 cm from the floor lighter than air gas sensors should be placed on or near the ceiling and gases which have a density close to that of air should have sensors installed in the breathing zone 4 6 f 1 2 1 8 m from the floor The breathing zone refers to the area 4 6 ft 1 2 1 8 m from the fl...

Страница 23: ...erved Data subject to change without notice 23 Rev B 2018 08 LPT P Operation Manual 5 5 Enclosure Mounting Components 5 5 1 Enclosure Base NUMBER FEATURE Œ Door Hinge 1 2 Conduit Entry Knockout Ž Mounting Holes Œ Ž Ž Œ Ž Ž ...

Страница 24: ...tions prior to powering the transmitter Damage from incorrect wiring connections or from too much voltage applied is not covered under warranty All wiring should be run in EMT or better conduit properly earth grounded All communications network wiring must be in shielded cabling The shield should be connected to earth ground close to the primary supply connection only and must have a contiguous co...

Страница 25: ...er a QCC or FCS the supply voltage will either be supplied by the QCC or FCS and any additional power requirements of the system will be supplied by RPS 24VDC Remote Power Supply devices If the LPT P is being used on systems other than a QCC or FCS then either 24VDC power supplies or 24VAC Class 2Transformers need to be used In all cases the voltage supply to the LPT P should never drop below 18VD...

Страница 26: ...xceed 61 m 200 ft The voltage at the remote sensor RedV to Black GND should be 24VDC If this voltage is not met after installation the wrong gauge wire may have been used or the wiring run is too long Wiring Example ESH A Remote Sensor amp The maximum length of wire between the ESH A Remote Sensor and the LPT P transmitter should not exceed 200 ft 61 m 5 6 3 Wire Gauge vs Run Length The table belo...

Страница 27: ...gital Control system DDC or Building Automation System BAS The LPT P continuously monitors gas concentrations on the configured channels and communicates the information back on request to a Controller or BAS DDC via Modbus RS 485 RTU Based on the gas concentration readings the Controller or BAS DDC will trigger the safety responses alarms relays etc as it has been programmed 6 1 Navigating the Me...

Страница 28: ...xit screen Most menus are circular and will bring you back to the Exit screen 6 2 Accessing the Menu with Passcodes The main menu structure is broken down by the passcode access entry These passcodes allow for direct access to the parts of the menu system of interest CODE NAME DESCRIPTION 1001 Hardware Configuration Adjust Display Contrast Change Modbus ID Change Baud Rate ARROW UP used for going ...

Страница 29: ...g normal operation using the display The display will be backlit when the menu is in active use Upon application of power the device will enter the warm up period and display a countdown of the time remaining before it is done warming up NOTE The LPT P will be visible on the BAS DDC system during the warm up countdown but a correct reading will not show up until the unit has finished the warm up p...

Страница 30: ...efault position Each gas channel splash screen will show the current status of the channel OK gas channel is operating normally LOW gas channel is in low alarm MID gas channel is in mid alarm HIGH gas channel is in high alarm FAULT gas channel is in fault COMM controller has been unable to communicate with the LPT P for at least 300 seconds in addition the backlight will illuminate making it easie...

Страница 31: ...st setting In the Hardware Configuration Menu passcode 1001 press either ARROW to scroll through the menu and select Contrast Adjust Press ENTER to select Use the ARROW keys to enter a number between 00 and 35 The factory default contrast level is 20 6 6 Fault Detection The LPT P has built in fault detection and in the event of a problem with the measurement circuitry the transmitter will indicate...

Страница 32: ...us ID and baud rate In order for communication to be successful between devices be sure your network connection is complete the network termination switches are set appropriately and all the devices are configured with the same baud rate character format etc Each device will have its own unique Modbus ID Individual transmitters being added to an existing system may require changes to the default M...

Страница 33: ...d rate for all CETCI Modbus devices is 19 200 If you need to change the baud rate in the Hardware Configuration Menu passcode 1001 press either ARROW to scroll through the menu and select BAUD Press ENTER and use the ARROW keys to scroll through the baud rates to choose from 9 600 14 400 19 200 default configurable 38 400 57 600 76 800 115 200 Select the preferred baud rate by pressing ENTER to sa...

Страница 34: ...determined as being LOW MID or HIGH The information will be read by the Controller or BAS and the appropriate safety measures such as triggering a relay s sounding an alarm etc will occur as programmed into the Controller or BAS Almost all installations will use the factory default alarm setpoints The default setpoints are SENSOR GAS TYPE LOW ALARM MID ALARM HIGH ALARM Carbon Monoxide CO 25 ppm 50...

Страница 35: ... number Press ENTER to move to the next digit and again to save and Exit the screen NOTE An Ascending alarm is used when the normal gas level starts out below the alarm setting and when the reading goes above it the alarm will trip A Descending alarm is used when the normal gas level starts above the alarm setting and when the reading goes below it the alarm will trip The descending alarm is commo...

Страница 36: ...n and off repetitively if the gas fluctuates just above and just below 100 ppm In the Sensor Configuration Menu passcode 3032 press either ARROW key to scroll through the menu and select the channel for which you are setting the hysteresis value Scroll through the menu options to SP Diff and press ENTER to select Use the ARROW keys to increase or decrease the number Press ENTER to move to the next...

Страница 37: ...r response is not caused NOTE This functionality is available in firmware version 1 29 onwards This test allows you to send a forced gas reading to the controller without having to expose the sensor to actual gas so you can make sure the LPT P is connected to the controller properly after installation and is still initiating an appropriate response from the controller during routine maintenance ch...

Страница 38: ...ithin the factory configured range of the sensor If you try to enter a number outside that limit the value will return to a valid value When finished press ENTER to accept and Exit the screen The gas level reading for that channel will be immediately sent to the controller This test reading will override any actual gas reading for that channel for the duration of the test To stop the test press EN...

Страница 39: ...tor and hose directing span gas into the sensor may result in slightly higher readings It is important to note that the type of gas mixture how old the gas is and what temperature it has been stored at will also affect repeatability during field calibration NOTE Catalytic sensors require oxygen to work and thus the user MUST flow clean air or Oxygen to obtain a true zero and the span gas must have...

Страница 40: ...tor or they can supply their own gas and equipment as long as the gas meets the minimum specifications CETCI does not ship gases outside of Canada 7 1 5 Gas Testing Frequency Bump Testing For the purpose of safety in OHS applications sensors should be gas tested bump tested once every month to confirm response and alarm activation 7 1 6 Non Intrusive Calibration Calibration can normally performed ...

Страница 41: ...rate a CO sensor Follow the same step for calibrating an NO2 sensor choosing the menu options for the channel assigned to NO2 To calibrate the internal sensor s the user must go through the following steps Step 1 In the Sensor Configuration Menu passcode 3032 press either ARROW key to scroll through the menu and select the channel you want calibrate Press ENTER and use the ARROW key to scroll to C...

Страница 42: ... span calibration gas level It is important to make sure that the span gas level value matches the calibration gas concentration you are using to calibrate the sensor The factory default calibration gas concentrations are SENSOR GAS TYPE CALIBRATION GAS LEVEL Carbon Monoxide CO 100 ppm Nitrogen Dioxide NO2 5 ppm Combustibles 20 LEL In the Sensor Configuration Menu passcode 3032 press either ARROW ...

Страница 43: ... finished and the Span calibration was accepted remove the cylinder of span gas Refer to Section 7 3 4Span RequiresOverride if the Span calibration was not successful Repeat the calibration steps above for each enabled gas channel NOTE After 5 minutes of inactivity the display will return to the normal operation NOTE If required the Zero Calibration and the Span Calibration procedures can be done ...

Страница 44: ...ft calibration is only done when the LPT P is being installed for the first time The reason for a zero shift calibration is to compensate for the new environment in which the LPT P is being installed 7 3 3 Zero Requires Override If the gas level possible residual gas is too high but still within the override range the display will indicate that an override is required To override the value use the...

Страница 45: ...not correct for In either case all that can be done is to attempt a complete calibration from the beginning Step 1 and determine if this corrects the fault If a calibration does not resolve the fault then the LPT P may need a new sensor If that does not correct the fault please contact our service department at service cetci com 7 3 6 Calibration Failure If the calibration fails while calibrating ...

Страница 46: ...powered up and have warmed up for a 24 hour period prior to calibration On the LPT P in the Sensor Configuration Menu passcode 3032 press either ARROW key to scroll through the menu and select the channel assigned to the ESH A Follow the instructions in Section 7 2CalibratingtheInternalSensor s with the exception of applying the gas to the ESH A sensor opening instead of the LPT P sensor opening 7...

Страница 47: ... if this is not the case Step 4 Return the jumpers to their original positions and close the ESH A Step 5 On the LPT P in the Sensor Configuration Menu passcode 3032 press either ARROW key to scroll through the menu and select the channel assigned to the ESH A Follow the instructions in Section 7 2CalibratingtheInternalSensor s with the exception of applying the gas to the ESH A sensor opening ins...

Страница 48: ...PT P Lifts 226 7 g lb solid steel Size 66 6 mm x 6 35 mm 2 5 8 X 1 4 Hexagon 8 3 Metal Protective Guard p n SCS 8000 RSG The metal protective guard is made of heavy duty metal and helps to protect against abrasive damage theft and vandalism to the transmitters It is made from 16 gauge galvanized steel and has 13 mm square openings in the front to allow gas and air to flow through to the sensor Wit...

Страница 49: ...60 mm H x 91 mm D 7 0 W x 6 3 H x 3 6 D 8 4 Calibration Kit p n CET 715A CK1 The Calibration Kit contains the items necessary for common field and shop calibrations It comes in a durable hard plastic carrying case and includes a regulator adapters humidification chamber brass fitting hand tools and tubing It does not include cylinders of gas These must be ordered separately ...

Страница 50: ...hould be kept free of dirt or soot build up If in a damp location source of water should be shielded from contacting the top of the transmitter If located in a working area the front of the transmitter should be kept clear If painting is to be conducted in the transmitter s location the transmitter needs to be protected from over spray and the sensor port should not receive paint fumes these fumes...

Страница 51: ... DDC on the Modbus network Check the Baud rate All devices in the network must have the same Baud rate Refer to Section 6 7 2ChangeModbus BaudRate Check the Modbus ID Each device must have a unique ID assigned to it Refer to Section 6 7 1ChangeModbus ID Check that local area network wiring is correct especially the A and B lines to make sure they are not swapped between devices on the network Chec...

Страница 52: ...antageWay Delta BC V4G 1M3 Canada Toll Free 1 877 940 8741 Tel 1 604 940 8741 Fax 1 604 940 8745 www critical environment com 2018 Critical EnvironmentTechnologies Canada Inc All rights reserved Data in this publication may change without notice LPTP20180820 B ...

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