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© 2020 All rights reserved. Data subject to change without notice. 

LPT-M - Operation Manual 

Rev. B | 2020.11

4 INSTRUMENT FEATURES

4.1 Exterior Enclosure

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Side view of LPT-M showing 
location of Magnetic Sensors.

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ARROW UP

ENTER

ARROW DOWN

Summary of Contents for LPT-M

Page 1: ...Operation Manual www critical environment com LPT MModbus Digital Transmitter Rev B 2020 11...

Page 2: ...10 2 2 Key Features 11 3 INSTRUMENT SPECIFICATIONS 12 3 1Technical Specifications 12 3 2 Internal Sensor GasTypes 15 3 3 ESH A Remote Sensor GasTypes 16 3 4 Enclosure Dimensions 17 4 INSTRUMENT FEATU...

Page 3: ...n 31 5 7 3 ESH A Remote SensorWiring Connection 32 5 7 4 Modbus Wire Gauge vs Run Length 32 6 SYSTEM OPERATION CONFIGURATION 34 6 1 Navigating the Menu Structure 34 6 2 Accessing the Menu with Passcod...

Page 4: ...s 50 6 11 1 Setting the Low Alarm Setpoint 50 6 11 2 Setting the Mid Alarm Setpoint 51 6 11 3 Setting the High Alarm Setpoint 52 6 11 4 Setting Hysteresis 52 6 12 Enable Disable Channels 53 7 CALIBRAT...

Page 5: ...A Remote Sensor Connected to an LPT M 61 7 4 1 Zero and Span Calibration of a Responsive ESH A Remote Sensor 61 7 4 2 Zero Calibration of a New or Replacement ESH A Remote Sensor 61 7 5 Calibrating a...

Page 6: ...g 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 Sec...

Page 7: ...ironmentTechnologies is not liable for auxiliary interfaced equipment or consequential damage All returned goods must be pre authorized by obtaining a Returned Merchandise Authorization RMA number All...

Page 8: ...perceive it You will be contacted with a cost estimate for expected repairs prior to the performance of any service work Pack the equipment well in its original packing if possible as we cannot be hel...

Page 9: ...be within properly grounded earth or safety conduit 1 6 Revisions This manual was written and published by CETCI The manufacturer makes no warranty or representation expressed or implied including any...

Page 10: ...on System BAS with Modbus RTU RS 485 serial communication Sensor configuration options include one two or three channel operation with a comprehensive choice of sensors for many toxic gases electroche...

Page 11: ...sensor and or one remote catalytic combustible or PIDTVOC sensor Modbus RTU RS 485 serial communication Graphic LCD display user selectable function Internal audible alarm 1 dry contact relay 30 volt...

Page 12: ...in x 2 8 in ELECTRICAL Power Requirement 16 30VDC 3W Class 2 12 27VAC 50 60 Hz 3VA Class 2 24V recommended See Section 5 7WiringConnections Current Draw 30 mA buzzer relay energized 2 sensors Wiring...

Page 13: ...Modbus ID 100 default configurable Baud rate 19 200 default configurable Data bits 8 Start bits 1 Stop bits 1 Parity none Analog signal 4 20 mA input signal from ESH A Remote Sensor Relay One SPDT dry...

Page 14: ...COUVRE UNIQUEMENT LES RISQUES DE CHOC ELECTRIQUE ET D INCENDIE D ORIGINE ELECTRIQUE Conforms to CSA C22 2 No 205 12 UL508 Edition 17 2007 Conforms to EMC Directive 2004 108 EC EN 50270 2006 Type 1 EN...

Page 15: ...PT M CLO2 0 1 0 ppm 2 years Ethylene C2 H4 LPT M C2H4 0 200 ppm 2 years Ethylene Oxide C2 H4 O LPT M EETO 0 20 ppm 2 years Fluorine F2 LPT M F2 0 1 0 ppm 1 2 years Formaldehyde CH2 O LPT M CH2O 0 5 0...

Page 16: ...Vol 3 years Ozone O3 LPT M O3 0 1 0 ppm 2 years Phosphine PH3 LPT M PH3 0 1 0 ppm 2 years Silane SiH4 LPT M SIH4 0 20 ppm 2 years Sulphur Dioxide SO2 LPT M SO2 0 20 ppm 2 years 3 3 ESH A Remote Sensor...

Page 17: ...254 mm 10 0 in 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 NOTE Th...

Page 18: ...hts reserved Data subject to change without notice LPT M Operation Manual Rev B 2020 11 4 INSTRUMENT FEATURES 4 1 Exterior Enclosure Side view of LPT M showing location of Magnetic Sensors ARROW UP EN...

Page 19: ...y opening and closing Display with green border Graphic LCD display Green border indicates transmitter operation is Modbus Magnetic Sensors arrow up Enter arrow down Use a magnetic wand to access menu...

Page 20: ...20 2020 All rights reserved Data subject to change without notice LPT M Operation Manual Rev B 2020 11 4 2 Interior System Layout...

Page 21: ...e SensorTerminal Terminal for connecting the ESH A Remote Sensor RelayTerminal Low voltage pluggable terminal for relay connection 30 volts 2 amps max RS 485 Communication Terminals Pluggable power an...

Page 22: ...TE All sensors are calibrated in the factory and do not require calibration at the time of a routine installation NOTE Temperature affects calibration It is important to ensure the gas is at the appro...

Page 23: ...pe of gas being monitored See Section5 5MountingtheTransmitter The LPT M should be protected from extreme weather conditions The LPT M requires no assembly and virtually no maintenance other than regu...

Page 24: ...red Any damage occurring from door removal procedure will not be covered under warranty Grasp the door with one hand being careful not to make contact with any of the internal components circuit board...

Page 25: ...length NOTE When mounting the enclosure allow enough room to allow the end user to open the door fully to access the internal adjustments 5 5 1 Wet Environment Considerations If the LPT M is to be in...

Page 26: ...phones and other electrical equipment may interfere with the response of the gas detectors 5 5 3 Mounting Height Sensor Dependent The sensor mounting height depends on the density of the gas relative...

Page 27: ...tice 27 Rev B 2020 11 LPT M Operation Manual Chlorine Cl2 Commercial swimming pools 15 cm above the floor 6 in above the floor Ozone O3 5 6 Enclosure Mounting Components 5 6 1 Enclosure Base NUMBER FE...

Page 28: ...nections 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...

Page 29: ...e to connect to the circuit board The rigidity of solid core wire can pull a soldered terminal strip completely off a circuit board and this will not be covered under warranty An end of line jumper mu...

Page 30: ...er The main wiring terminal strip on the LPT M circuit board can be unplugged for easier wiring installation Grasp the two sides of the terminal strip and pull sideways The wiring should be 4 conducto...

Page 31: ...gized under normal non alarm conditions The relay is de energized when if power fails In most applications the relay function should use the common COM and normally closed NC terminals With this wirin...

Page 32: ...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 E...

Page 33: ...ons if the recommended maximum cable length needs to be exceeded an LNK XT Network Extender can be used to boost the waning signal strength One LNK XT extends the network length by an additional 610 m...

Page 34: ...ding to the gas readings alarm setpoints buzzer and relay configurations as outlined in this manual In the event of a gas build up in excess of the alarm setpoints the internal alarm will sound and th...

Page 35: ...he ARROW UP key will normally take you to the Exit 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 dow...

Page 36: ...ault Test Audible Buzzer Program Relays Enable Disable Relays Relay ON OFF Delays YES NO Failsafe Relay Alarm Setpoints Low Med High Fault Test Relay Change Modbus ID Change Baud Rate 3032 Sensor Conf...

Page 37: ...but a correct reading will not show up until the unit has finished the warm up period and the sensor s has stabilized After the warm up period 3 minutes the device may exhibit gas alarm conditions if...

Page 38: ...w 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 M for at least 300 seconds NOTE If t...

Page 39: ...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 M has built in fault detect...

Page 40: ...tc Each device will have its own unique Modbus ID Individual transmitters being added to an existing system may require changes to the default Modbus settings 6 7 1 Change Modbus ID If required you ca...

Page 41: ...about the Modbus holding registers please contact CETCI for assistance or refer to the Modbus Holding Registers Manual at https www critical environment com media download manuals Holding Registers L...

Page 42: ...ugh the menu and choose Audible Enable Press ENTER to choose between ON or OFF 6 8 2 Audible ON Delay You can set the buzzer to be delayed in sounding for a specified period of time after the LPT M ha...

Page 43: ...ng the buzzer enter 0000 6 8 3 Audible Alarm Level Assignment You can choose one level of alarm at which the buzzer will sound Choose from LOW MID HIGH or FAULT NOTE The LOW MID and HIGH setpoints of...

Page 44: ...y providing one set of usable dry contacts for the relay Because the LPT M system is designed to be fail safe any equipment to be controlled by the system relay should be wired to the NC Normally clos...

Page 45: ...ELAY has been set the relay will stay tripped for the duration of the RELAY OFF DELAY NOTE Each channel will trip the relay according to that channel s alarm setpoints and relay alarm level assignment...

Page 46: ...ing no ON or OFF Delays are set 6 9 3 Relay Mode of Operation Normal or FAILSAFE The LPT M is designed to be fail safe so the relay is normally energized in a non alarm state for failsafe operation If...

Page 47: ...t Relay Alarms Press ENTER and use the ARROW keys to scroll through the choices Press Enter to save and Exit 6 10 Test Functions 6 10 1 Test Audible Buzzer NOTE Before testing the audible alarm soundi...

Page 48: ...enu and select Program Relay Press ENTER and use the ARROW keys to scroll through the menu and select RelayTest Press ENTER and use the ARROW keys to increase or decrease the number of seconds You can...

Page 49: ...operly after installation and is still initiating an appropriate response from the controller during routine maintenance checks The test only applies to the channel you have chosen In the Sensor Confi...

Page 50: ...ctor 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 alarm will be triggered un...

Page 51: ...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 goe...

Page 52: ...he alarm You can set a hysteresis value that will be common for all alarm setpoints on that channel For example if the alarm is set to come on at 100 ppm and the hysteresis is set for 5 ppm the alarm...

Page 53: ...ey to choose ON or OFF Use the ARROW key to move on to the next menu item and ENTER to Exit 7 CALIBRATION 7 1 Calibration Specifications 7 1 1 Gas Calibration span gases should have at least 5 accurac...

Page 54: ...eavier than air NO2 etc should be flowed between 0 5 and 1 0 LPM Fixed flow regulators provide more accuracy 7 1 3 Adapters The proper calibration adapter should be utilized to allow the gas to proper...

Page 55: ...the concentration of the flow of gas Also keep the length of the tubing as short as possible no more than 0 91 to 1 22 m 3 4 ft so the gas flow concentration doesn t lessen over the distance from the...

Page 56: ...NOTE If calibrating an Oxygen sensor refer to Section 7 5CalibratinganOxygenSensor To calibrate the internal sensor s the user must go through the following steps Step 1 In the Sensor Configuration M...

Page 57: ...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 g...

Page 58: ...shed 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...

Page 59: ...ibration is only done when the LPT M 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 M is being installed 7 3 3...

Page 60: ...orrect 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...

Page 61: ...nnected to In the Sensor Configuration Menu passcode 3032 press either ARROW key to scroll through the menu and select the channel the ESH A is assigned to Follow the instructions in Section 8 2 Calib...

Page 62: ...ess either ARROW key to scroll through the menu and select the channel the ESH A has been assigned to Follow the instructions in Section 8 2CalibratingtheInternalSensor s with the exception of applyin...

Page 63: ...or opening on the front of the enclosure door see Section 7 3 1CalibrationAdapterPlugif the adapter will not fit Once gas is detected display will show a countdown from 180 seconds 3 minutes NOTE If a...

Page 64: ...art when the flow of gas is detected When the process has finished and the Zero calibration was accepted press ENTER to Exit and remove the cylinder of Nitrogen gas Refer to Section 7 3 3Zero Requires...

Page 65: ...else the gas readings will not be accurate 8 3 Magnetic Wand p n CET MW The magnetic wand is used for accessing menu options and program functions without opening the enclosure Use to engage the magn...

Page 66: ...SG The splash cover is made of a material that allows the sticky gas to reach the sensor without adhering to the vent opening plus protects the sensor from water ingress Enclosure 16 gauge galvanized...

Page 67: ...except the sensors The transmitter should be monitored for possible damaging conditions The sensor vent should be kept free of dirt or soot build up If in a damp location source of water should be shi...

Page 68: ...Check the connections and refer to the Wiring Examples in Section 5 7WiringConnections Device cannot be seen by the Controller and or the BAS DDC on the Modbus network Check the Baud rate All devices...

Page 69: ...nformation Press ENTER and then the UP ARROW key to see this diagnostics screen ADC The current Analog to Digital Count number Reading The final gas reading after all filters N The new sensitivity in...

Page 70: ...70 2020 All rights reserved Data subject to change without notice LPT M Operation Manual Rev B 2020 11 NOTES...

Page 71: ...2020 All rights reserved Data subject to change without notice 71 Rev B 2020 11 LPT M Operation Manual NOTES...

Page 72: ...45 7391VantageWay Delta BC V4G 1M3 Canada Toll Free 1 877 940 8741 Tel 1 604 940 8741 www critical environment com 2020 Critical EnvironmentTechnologies Canada Inc All rights reserved Data in this pub...

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