Critical Environment Technologies LPT-M User manual

Operation Manual
www.critical-environment.com
LPT-M Modbus Digital Transmitter
Rev. B | 2020.11

2 © 2020 All rights reserved. Data subject to change without notice.
LPT-M - Operation Manual Rev. B | 2020.11
TABLE OF CONTENTS
1 POLICIES.......................................................................................................... 6
1.1 Important Note................................................................................................6
1.2Warranty Policy................................................................................................7
1.3 Service Policy...................................................................................................7
1.4 Copyrights........................................................................................................8
1.5 Disclaimer........................................................................................................9
1.6 Revisions..........................................................................................................9
2 INTRODUCTION ...........................................................................................10
2.1 General Description........................................................................................10
2.2 Key Features...................................................................................................11
3 INSTRUMENT SPECIFICATIONS .................................................................12
3.1Technical Specications..................................................................................12
3.2 Internal Sensor GasTypes...............................................................................15
3.3 ESH-A Remote Sensor GasTypes ....................................................................16
3.4 Enclosure Dimensions....................................................................................17
4 INSTRUMENT FEATURES.............................................................................18
4.1 Exterior Enclosure ..........................................................................................18
4.2 Interior System Layout...................................................................................20
5 INSTALLATION..............................................................................................22
5.1 Special Considerations for DierentTypes of Sensors .....................................22
5.2 General Safety Warnings................................................................................23
5.3 Protection Against Electrical Risks..................................................................23
5.4 Protection Against Mechanical Risks..............................................................24
5.5 Mounting theTransmitter..............................................................................25

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5.5.1Wet Environment Considerations ....................................................................25
5.5.2 EMI and RF Interference Considerations..........................................................25
5.5.3 Mounting Height (Sensor Dependent) ............................................................26
5.6 Enclosure Mounting Components ..................................................................27
5.6.1 Enclosure Base ................................................................................................27
5.6.2 Enclosure Bottom............................................................................................28
5.7Wiring Connections........................................................................................28
5.7.1 Power & Output Connections ..........................................................................29
5.7.2 RelayWiring Connection.................................................................................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 Passcodes...............................................................35
6.3 Power Up andWarm-up.................................................................................37
6.4 Display Select.................................................................................................37
6.5 Set LCD Display Contrast Level........................................................................39
6.6 Fault Detection...............................................................................................39
6.7 Modbus® Settings..........................................................................................40
6.7.1 Change Modbus® ID........................................................................................40
6.7.2 Change Baud Rate...........................................................................................40
6.7.3 Modbus® Holding Registers ............................................................................41
6.8 Alarm / Buzzer Operation...............................................................................41
6.8.1 Enable / Disable Audible .................................................................................42
6.8.2 Audible ON Delay ............................................................................................42
6.8.3 Audible Alarm Level Assignment.....................................................................43
6.9 Relay Operation .............................................................................................44
6.9.1 Enable / Disable Relay.....................................................................................44

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LPT-M - Operation Manual Rev. B | 2020.11
6.9.2 Setting Relay ON / OFF Delay...........................................................................45
6.9.3 Relay Mode of Operation (Normal or FAILSAFE)...............................................46
6.9.4 Relay Alarm Level Assignment........................................................................46
6.10Test Functions ..............................................................................................47
6.10.1Test Audible / Buzzer.....................................................................................47
6.10.2 Test Relay ......................................................................................................48
6.10.3Test Gas Reading Response / SendTest Reading to Controller........................49
6.11 Setting Channel Alarm Setpoints.................................................................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 CALIBRATION................................................................................................53
7.1 Calibration Specications...............................................................................53
7.1.1 Gas..................................................................................................................53
7.1.2 Regulators & Flow...........................................................................................54
7.1.3 Adapters..........................................................................................................54
7.1.4 Calibration Frequency .....................................................................................54
7.1.5 Gas Testing Frequency (BumpTesting) ............................................................55
7.1.6 Sticky Gases.....................................................................................................55
7.1.7 Non-Intrusive Calibration................................................................................55
7.2 Calibrating the Internal Sensor(s) ..................................................................56
7.3Troubleshooting Calibration...........................................................................58
7.3.1 Calibration Adapter Plug.................................................................................59
7.3.2 Zero Calibration Shift.......................................................................................59
7.3.3 Zero - Requires Override..................................................................................59

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7.3.4 Span - Requires Override.................................................................................59
7.3.5 Fault Reading..................................................................................................60
7.3.6 Calibration Failure...........................................................................................60
7.4 Calibrating an ESH-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 an Oxygen Sensor ........................................................................62
8 ACCESSORIES ...............................................................................................64
8.1 Splash Guard..................................................................................................64
8.2 Calibration Adapter Clip“Cal Clip”...................................................................65
8.3 MagneticWand..............................................................................................65
8.4 Metal Protective Guard ..................................................................................65
8.5 Calibration Kit................................................................................................66
9 MAINTENANCE.............................................................................................67
10 TROUBLE SHOOTING ................................................................................67

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LPT-M - Operation Manual Rev. B | 2020.11
1 POLICIES
1.1 Important Note
Read and understand this manual prior to using this instrument. Carefully read the warranty policy,
service policy, notices, disclaimers and revisions on the following pages.
This product must be installed by a qualied electrician or factory trained technician and according
to instructions indicated in this manual.This instrument should be inspected and calibrated
regularly by a qualied and trained technician. For more information, refer to Section 7 Calibration
and Section 9 Maintenance of this manual.
This instrument has not been designed to be intrinsically safe. For your safety, do not use it in
classied hazardous areas (explosion-rated environments).
INSTRUMENT SERIAL NUMBER:
______________________________________________________
PURCHASE DATE:
______________________________________________________
PURCHASED FROM:
______________________________________________________

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1.2 Warranty Policy
Critical Environment Technologies Canada Inc. warrants the products we manufacture (excluding
sensors, battery packs, batteries, pumps, and lters) to be free from defects in materials and
workmanship for a period of two years from the date of purchase from our facility. As a reminder,
sensors are consumable items and once they leave our factory, we cannot reuse or resell them.
As such, all sensor sales are nal. Should the sensor itself be faulty, there is a one-year pro-rated
warranty that would apply from the date of purchase from our facility.
The warranty status may be aected if the instrument has not been used and maintained as per
the instructions in the manual or has been abused, damaged, or modied in any way. The product
is only to be used for the purposes stated in the manual. Critical EnvironmentTechnologies 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 goods must be shipped to Critical EnvironmentTechnologies freight prepaid.
Contact the manufacturer for an RMA number and procedures required for product transport.
Due to ongoing research, development, and product testing, the manufacturer reserves the right to
change specications 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.
1.3 Service Policy
CETCI maintains an instrument service facility at the factory. Some CETCI distributors / agents may
also have repair facilities; however, CETCI assumes no liability for service performed by anyone
other than CETCI personnel.
Repairs are warranted for 90 days after date of shipment (sensors have individual warranties).
Should your instrument require non-warranty repair, you may contact the distributor from whom it
was purchased or you may contact CETCI directly.

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LPT-M - Operation Manual Rev. B | 2020.11
Prior to shipping equipment to CETCI, contact our oce for an RMA #. All returned goods must be
accompanied with an RMA number.
If CETCI is to do the repair work, you may send the instrument, prepaid, to:
Attention: Service Department
Critical Environment Technologies Canada Inc.
Unit 145, 7391 Vantage Way
Delta, BC, V4G 1M3
You must include your Returned Merchandise Authorization (RMA) number, address, telephone
number, contact name, shipping / billing information, and a description of the defect as you
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 held responsible for any damage incurred during shipping to our facility. All incurred shipping
charges, duties and taxes are your responsibility.
For liability reasons, CETCI has a policy of performing all needed repairs to restore the instrument to
full operating condition.
1.4 Copyrights
This manual is subject to copyright protection; all rights are reserved. Under international and
domestic copyright laws, this manual may not be copied or translated, in whole or in part, in any
manner or format, without the written permission of CETCI.
Modbus® is a registered trademark of Gould Inc. Corporation.

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1.5 Disclaimer
Under no circumstances will CETCI be liable for any claims, losses or damages resulting from or
arising out of the repair or modication of this equipment by a party other than CETCI service
technicians, or by operation or use of the equipment other than in accordance with the printed
instructions contained within this manual or if the equipment has been improperly maintained or
subjected to neglect or accident. Any of the forgoing will void the warranty.
Under most local electrical codes, low voltage wires cannot be run within the same conduit as line
voltage wires. It is CETCI policy that all wiring of our products meet this requirement.
It is CETCI policy that all wiring 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 warranty of merchantability or tness 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 eorts to improve its products and their documentation, the
manufacturer reserves the right to make changes at any time without notice. In addition, due to
improvements made to our products, there may be information in this manual that does not exist
in the version of the product the user has. Should you detect any error or omission in this manual,
or should you want to inquire regarding upgrading the device’s rmware, please contact CETCI at
the following address:
Critical Environment Technologies Canada Inc.
Unit 145, 7391VantageWay, Delta, BC,V4G 1M3, Canada
Toll Free: +1.877.940.8741

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LPT-M - Operation Manual Rev. B | 2020.11
Telephone: [phone]
Email: [e-mail]
Website: www.critical-environment.com
In no event will CETCI, its ocers or employees be liable for any direct, special, incidental or
consequential damages resulting from any defect in any manual, even if advised of the possibility
of such damages.
2 INTRODUCTION
2.1 General Description
Thank you for purchasing our LPT-M Modbus®Transmitter. The LPT-M is a full-featured, digital
gas detector for monitoring toxic and combustible gases in non-hazardous (non-explosion
rated) environments such as commercial HVAC and light industrial applications. It is designed to
communicate with a Controller or Building Automation System (BAS) with Modbus® RTU RS-485
serial communication.
Sensor conguration options include one, two or three channel operation with a comprehensive
choice of sensors for many toxic gases (electrochemical) and combustible (catalytic) gases, plus PID
TVOCs. All LPT-M transmitters operate by diusion.The sensors utilized in this device are accurate
enough to measure to Occupational Health & Safety (OHS) hazardous levels for toxic gases.
Operating as a digital transmitter or as a standalone xed system, the LPT-M oers an audible
internal alarm, one dry contact relay, graphic LCD display with user selectable functions,
temperature compensation and an automatic thermal resetting fuse all in a RoHS compliant
package and standard water / dust tight enclosure.With the optional splash guard installed, the
enclosure is IP54 rated and will be protected in water spray or wash down applications. An optional
internal heater for is available for cold environment applications.

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If after reading through the manual, you have any questions, please do not hesitate to contact our
Technical Service Department for technical support.
2.2 Key Features
• Up to 3 sensor congurations: single or dual internal electrochemical sensor and/or one
remote catalytic combustible or PID TVOC sensor
• Modbus® RTU RS-485 serial communication
• Graphic LCD display (user selectable function)
• Internal audible alarm
• 1 dry contact relay, 30 volts, 2 amps maximum
• 4-conductor shielded network wiring (daisy-chain)
• 24 volt DC or AC power (ground referenced)
• Optional heater for cold environment applications
• Standard water / dust tight, corrosion resistant enclosure (drip proof).With optional splash
guard installed, the enclosure is IP54 rated.
• RoHS compliant circuit boards
• Auto resetting fuses

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LPT-M - Operation Manual Rev. B | 2020.11
3 INSTRUMENT SPECIFICATIONS
3.1 Technical Specications
MECHANICAL
Enclosure ABS / Polycarbonate, IP54 rating with splash guard installed.
Copper coated interior to reduce RF interference.
Weight 400 g / 14 oz
Size 127 mm x 127 mm x 71 mm
5.0 in x 5.0 in x 2.8 in
ELECTRICAL
Power Requirement 16 - 30VDC, 3 W, Class 2
12 - 27VAC, 50-60 Hz, 3 VA, Class 2
24V recommended. See Section 5.7 Wiring Connections.
Current Draw 30 mA (buzzer & relay energized, 2 sensors)
Wiring (4-wire)
VDC orVAC (ground referenced) four-conductor shielded 16 AWG
stranded within conduit, network wiring (daisy-chain), Modbus®
RTU (version 1.1b3) RS-485
Fuses Automatic resetting thermal
USER INTERFACE
Display
Graphic LCD, green border. Text prompting for calibration
operation and fault indications. Installer congurable to suppress
all other displays.

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Magnetic Sensors Use a magnetic wand to access menu options and initiate
calibration without opening the enclosure.
Audible Alarm Standard internal buzzer, rated 90 dB @ 10 cm, enable/disable
INPUT/OUTPUT
Communication
Modbus® RTU over RS-485
Modbus® ID: 100 (default, congurable)
Baud rate: 19,200 (default, congurable)
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 contact relay, 30 volts, 2 Amps maximum
ENVIRONMENTAL
OperatingTemperature
-20°C to 40°C / -4°F to 104°F
NOTE: Low temperature option available to -40°C / -40°F) (Sensor
dependent, some extremely cold applications may require a small
internal silicone heater to maintain temperature stability for sensor.
Contact CETCI for details)
Operating Humidity 15 - 90% RH non-condensing

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LPT-M - Operation Manual Rev. B | 2020.11
CERTIFICATION
Model: LPT-M-XXX
S/N: LPTM1603B00001
Rating: 16-30VDC, 3W, Class 2
12-27VAC, 50-60 Hz, 3VA, 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-C22.2 No. 205-12, UL508 (Edition 17):2007
Conforms to: EMC Directive 2004/108/EC, EN 50270:2006,Type 1, EN61010
Conforms to: FCC. This device complies with part 15 of the FCC Rules, Operation is subject to
the following two conditions: (1)This device may not cause harmful interference, and (2) this
device must accept any interference received, including interference that may cause undesired
operation.

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3.2 Internal Sensor Gas Types
Internal Electrochemical
Sensors Part Number Range Lifespan
Ammonia (NH3) LPT-M-NH3 0 - 500 ppm ~2 years
Carbon Monoxide (CO) LPT-M-TCO 0 - 200 ppm ~6 years
Chlorine (Cl2) LPT-M-CL2 0 - 5.0 ppm ~3 years
Chlorine Dioxide (ClO2) LPT-M-CLO2 0 - 1.0 ppm ~2 years
Ethylene (C2H4) LPT-M-C2H4 0 - 200 ppm ~2 years
Ethylene Oxide (C2H4O) LPT-M-EETO 0 - 20 ppm ~2 years
Fluorine (F2) LPT-M-F2 0 - 1.0 ppm ~1 - 2 years
Formaldehyde (CH2O) LPT-M-CH2O 0 - 5.0 ppm ~2 years
Hydrogen (H2) LPT-M-EH2 0 - 2,000 ppm ~2 years
Hydrogen Chloride (HCl) LPT-M-HCL 0 - 30 ppm ~2 years
Hydrogen Cyanide (HCN) LPT-M-HCN 0 - 30 ppm ~2 years
Hydrogen Fluoride (HF) LPT-M-HF 0 - 10.0 ppm ~1 - 2 years
Hydrogen Sulphide (H2S) LPT-M-H2S 0 - 50 ppm ~2 years
Hydrogen Sulphide (H2S) LPT-M-H2SB 0 - 50 ppm ~5 years
Nitric Oxide (NO) LPT-M-NO 0 - 100 ppm ~2 years

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LPT-M - Operation Manual Rev. B | 2020.11
Internal Electrochemical
Sensors continued...
Part Number Range Lifespan
Nitrogen Dioxide (NO2) LPT-M-NO2A 0 - 10 ppm ~3 years
Nitrogen Dioxide (NO2) LPT-M-NO2B 0 - 10 ppm ~6 years
Oxygen (O2) LPT-M-O2 0 - 25%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 Gas Types
ESH-A Remote Sensors - Combustible (Catalytic)
Hydrogen (H2) ESH-A-CH2-100 0 - 100% LEL ~5 years
Methane (CH4) ESH-A-CCH4-100 0 - 100% LEL ~5 years
Propane (C3H8) ESH-A-CC3H8-100 0 - 100% LEL ~5 years
ESH-A Remote Sensors - PID TVOC
PIDTVOC
ESH-A-SPL 0 - 30 ppm usage / application
dependent
ESH-A-SPH 0 - 300 ppm

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3.4 Enclosure Dimensions
Above dimensions are shown with optional splash guard.Without splash guard, thickness is
71 mm / 2.8 in.The area required for enclosure door to be open 90 degrees is 178 mm / 7.0 in or
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: The standard splash guard (Option -S) is optional for protecting non sticky gas sensors
in wash down applications. For sticky gas sensors such as Chlorine (Cl2), Chlorine Dioxide (ClO2),
Hydrogen Chloride (HCL), Hydrogen Cyanide (HCN), Hydrogen Fluoride (HF), Ozone (O3) and
Phosphine (PH3) order the sticky gas splash guard Option -SN).

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LPT-M - Operation Manual Rev. B | 2020.11
4 INSTRUMENT FEATURES
4.1 Exterior Enclosure
Œ
Œ
•
•Ž
•
‘
Side view of LPT-M showing
location of Magnetic Sensors.
Ž
Ž
Ž
ARROW UP
ENTER
ARROW DOWN

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Rev. B | 2020.11 LPT-M - Operation Manual
NUMBER FEATURE FUNCTION
ŒDoor Hinge Secures door to base and allows easy
opening and closing
•Display with green border
Graphic LCD display. Green border
indicates transmitter operation is
Modbus®
ŽMagnetic Sensors (arrow
up, Enter, arrow down)
Use a magnetic wand to access menu
options and program functions without
opening the enclosure
•Sensor Opening Allows gas diusion into sensor
•Door Screw Secures door shut
‘Padlock Opening For security padlock

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LPT-M - Operation Manual Rev. B | 2020.11
4.2 Interior System Layout
Œ
Œ
Œ
•
Ž
•
•
‘