Critical Environment Technologies LPT-P User manual

Operation Manual
www.critical-environment.com
LPT-PDigital Car Park Transmitter
Rev. B | 2018.08

2 © 2018 All rights reserved. Data subject to change without notice.
LPT-P - Operation Manual Rev. B | 2018.08
TABLE OF CONTENTS
1 POLICIES..........................................................................................................5
1.1 Important Note................................................................................................5
1.2Warranty Policy................................................................................................6
1.3 Service Policy...................................................................................................6
1.4 Copyrights and Registered Trademarks ............................................................7
1.5 Disclaimer........................................................................................................7
1.6 Revisions..........................................................................................................8
2 INTRODUCTION .............................................................................................9
2.1 General Description..........................................................................................9
2.2 Key Features...................................................................................................10
3 INSTRUMENT SPECIFICATIONS .................................................................11
3.1Technical Specications..................................................................................11
3.2 Internal Sensor GasTypes...............................................................................13
3.3 ESH-A Remote Sensor Gas Types ....................................................................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 Safety Warnings................................................................................19
5.2 Protection Against Electrical Risks..................................................................19
5.3 Protection Against Mechanical Risks..............................................................20
5.4 Mounting theTransmitter..............................................................................20
5.4.1Wet Environment Considerations ....................................................................21

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5.4.2 EMI and RF Interference Considerations..........................................................21
5.4.3 Mounting Height (Sensor Dependent) ............................................................22
5.5 Enclosure Mounting Components ..................................................................23
5.5.1 Enclosure Base ................................................................................................23
5.5.2 Enclosure Bottom............................................................................................24
5.6Wiring Connections........................................................................................24
5.6.1 Power & Output Connections ..........................................................................25
5.6.2 ESH-A Remote Sensor Wiring Connection........................................................26
5.6.3Wire Gauge vs Run Length...............................................................................26
6 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 Alarm Setpoint......................................................................34
6.8.2 Setting the Mid Alarm Setpoint ......................................................................35
6.8.3 Setting the High Alarm Setpoint.....................................................................36
6.8.4 Setting Hysteresis............................................................................................36
6.9 Enable / Disable Channels..............................................................................36
6.10Test Gas Reading Response / SendTest Reading to Controller.......................37

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7 CALIBRATION................................................................................................39
7.1 Calibration Specications...............................................................................39
7.1.1 Gas..................................................................................................................39
7.1.2 Regulators & Flow...........................................................................................39
7.1.3 Adapters..........................................................................................................39
7.1.4 Calibration Frequency .....................................................................................40
7.1.5 Gas Testing Frequency (Bump Testing)............................................................40
7.1.6 Non-Intrusive Calibration................................................................................40
7.2 Calibrating the Internal Sensor(s) ..................................................................41
7.3Troubleshooting 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 Remote Sensor....................46
8 ACCESSORIES ...............................................................................................47
8.1 Splash Guard..................................................................................................48
8.2 MagneticWand..............................................................................................48
8.3 Metal Protective Guard ..................................................................................49
8.4 Calibration Kit................................................................................................49
9 MAINTENANCE.............................................................................................50
10 TROUBLE SHOOTING ................................................................................50

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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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LPT-P - Operation Manual Rev. B | 2018.08
1.2 Warranty Policy
Critical EnvironmentTechnologies Canada Inc. (CETCI), also referred to as the manufacturer,
warrants this instrument, (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. The sensors have a warranty period of one year on a pro-rated basis from
the date of purchase from our facility. If the product should become defective within this
warranty period, we will repair or replace it at our discretion.
The warranty status may be aected if the instrument has not been used and maintained per the
instructions in this manual or has been abused, damaged, or modied in any way.This instrument
is only to be used for purposes stated herein.The manufacturer 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 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.
All goods must be shipped to the manufacturer by prepaid freight. All returned goods must be
pre-authorized by obtaining a Returned Merchandise Authorization (RMA) number. Contact the
manufacturer for a number and procedures required for product transport.
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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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
Always 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. 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. 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 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.
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

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LPT-P - Operation Manual Rev. B | 2018.08
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
Telephone: [phone]
Fax: [phone]
Email: mark[email protected]
Website: www.critical-environment.com

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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-P Digital Car Park Transmitter.
The LPT-P is an economical, digital transmitter with up to three gas channels, designed to be part of
a gas detection system for enclosed parking garages / car parks and auto repair shop applications.
Each LPT-P transmitter can be congured as:
• A 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 Dioxide (NO2) sensor plus one
catalytic ESH-A Remote Sensor
• A three channel gas detector with one internal CO sensor, one internal NO2sensor plus one
catalytic ESH-A Remote Sensor
Features include a back lit, LCD digital display with user selectable function, standard Modbus®
RS-485 RTU digital output and a standard water / dust tight, corrosion resistant enclosure that is
IP54 rated with the factory installed splash guard.The LPT-P comes standard with Modbus® RTU

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LPT-P - Operation Manual Rev. B | 2018.08
wide area network (WAN) output to Building Automation System (BAS) or Direct Digital Control
(DDC) system.
All LPT-P digital 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.
If after 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 congurations: single or dual internal CO or NO2sensor 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)
• 24 volt DC power
• 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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3 INSTRUMENT SPECIFICATIONS
3.1 Technical Specications
MECHANICAL
Enclosure ABS / Polycarbonate, IP54 rated 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”x 5.0”x 2.8”
ELECTRICAL
Power Requirement 16 - 30VDC, 3W, Class 2
24V recommended. See Section 5.6 Wiring Connections.
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 congurable to suppress
all other displays.
Magnetic Switches Use a magnetic wand to access menu options and program
functions without opening the enclosure.

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LPT-P - Operation Manual Rev. B | 2018.08
INPUT / OUTPUT
Modbus® Communication
(standard)
p/n: LPT-P
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
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-C22.2 No. 205-12 / UL508 (Edition 17):2007
Conforms to: EMC Directive 2004/108/EC, EN 50270:2006,Type 1, EN61010

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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.
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 - 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

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LPT-P - Operation Manual Rev. B | 2018.08
3.4 Enclosure Dimensions
Above dimensions 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.

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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

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LPT-P - Operation Manual Rev. B | 2018.08
NUMBER FEATURE FUNCTION
ŒDoor Hinge Secures door to base and allows
easy opening and closing
•Display with white border Graphic LCD display.
ŽMagnetic 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 diusion into sensor
•Door Screw Secures door shut
‘Padlock Opening For security padlock

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4.2 Interior System Layout
NUMBER FEATURE FUNCTION
ŒProgramming 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
•
ŒŽ
•
•
Œ
Œ
•

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LPT-P - Operation Manual Rev. B | 2018.08
ŽTP1 andTP2 Test Points 1 and 2 to conrm voltage registers are
working. Reading should be 3.3 volts.
•RS-485 Communication
Terminals
Pluggable power and signal terminal for connection
to controller and next transmitter.
•Termination Resistor Network termination resistor.“IN”position includes
120 ohm resistor.
5 INSTALLATION
The sensor in the LPT-P goes through a burn in period at our factory prior to shipiping so it is ready
for operation upon arrival. If you install the LPT-P when it arrives the sensors will require about a 5
minute warm up period. If the device 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 installation.
NOTE: A bump test will help you determine if a sensor requires calibration. If the sensor still does
not respond as it should after a successful calibration, it probably requires replacing.
NOTE: Silicone, lead and chlorinated hydrocarbon vapours can poison catalytic sensors.
NOTE: Temperature aects calibration. It is important to ensure the gas is at the appropriate
temperature during calibration. If the sensor is being used in an extreme temperature range,

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calibration should be done in that same temperature range.
5.1 General Safety Warnings
The LPT-P is intended for indoor use, permanently mounted at a height that is appropriate for
the type of gas being monitored. See Section 5.4 Mounting the Transmitter. The LPT-P should be
protected from extreme weather conditions.
The LPT-P requires no assembly and virtually no maintenance other than regular calibration of the
integral and/or remote sensors and ensuring that excess water or dust is not somehow entering
the enclosure and physically damaging the circuit board or internal components.There are 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 should be labelled as LPT-P supply (disconnecting power to the LPT-P).
Appropriate markings should be visible at the circuit breaker / switch that is supplying power to
the LPT-P.
This device may interfere with pacemakers. Modern pacemakers have built-in features to protect
them from most types of interference produced by other electrical devices you might encounter in
your daily routine. If you a have a pacemaker, follow your healthcare provider’s instructions about
being around this type of equipment.

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LPT-P - Operation Manual Rev. B | 2018.08
5.3 Protection Against Mechanical Risks
The door of the enclosure can be removed if absolutely necessary to facilitate installation of the
base but it is not recommended on this version. Extreme care and caution must be exercised
when removing the door to avoid damaging the hinges.The door should only be removed when
absolutely required. Any damage occurring from door removal procedure will not be covered under
warranty.
Simply grasp the door with one hand, being careful not to make contact with any of the internal
components (circuit board), grasp the base with your other hand.Tug on the base and pull straight
apart. DO NOT TWIST.The section of the hinges located 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 transmitter to be locked.
See Section 4.1 Exterior Enclosure.
Be aware that the hinged door that could potentially pinch ngers and the sharp edges and/or
jumper pins on the board could potentially prick or cut ngers if not handled carefully.
5.4 Mounting the Transmitter
The LPT-P should be mounted on a at vertical surface using the four 4.4 mm / 0.175 in diameter
mounting holes provided to maintain water tight status. Care should be taken to ensure that the
face of the LPT-P is not obstructed in order to maximize the sensor’s exposure to the environment
being monitored.