Critical Environment Technologies LPT Operation Manual
Operation Manual
www.critical-environment.com
LPT Economical Transmitter (Electrochemical Sensor)
Rev. C | 2013.06
2 © 2013 All rights reserved. Data subject to change without notice.
LPT - Operation Manual Rev. C | 2013.06
TABLE OF CONTENTS
1 POLICIES ..........................................................................................................4
1.1 Important Note ................................................................................................4
1.2 Warranty Policy ................................................................................................5
1.3 Service Policy ...................................................................................................6
1.4 Copyrights ........................................................................................................7
1.6 Revisions ..........................................................................................................7
2 INTRODUCTION .............................................................................................8
2.1 General Description ..........................................................................................8
2.2 Key Features .....................................................................................................9
3 INSTRUMENT SPECIFICATIONS .................................................................10
3.1 Technical Specications ..................................................................................10
3.2 Standard Enclosure Dimensions .....................................................................12
4 SENSOR SPECIFICATIONS ...........................................................................13
4.1 Sensor Specications .....................................................................................13
4.2 Calibration Extending Firmware (CEF) and Sensor Aging................................15
5 FEATURES & FUNCTIONS ............................................................................16
5.1 Exterior Enclosure ..........................................................................................16
5.2 Interior System Layout ...................................................................................17
6 INSTALLATION ..............................................................................................18
6.1 Sensor Mounting Heights ...............................................................................19
6.2 Enclosure Mounting Components ..................................................................20
Enclosure Base ......................................................................................................... 20
Enclosure Bottom ..................................................................................................... 21
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Rev. C | 2013.06 LPT - Operation Manual
6.3 Wiring Connections ........................................................................................21
Wiring Examples ...................................................................................................... 22
Wire Gauge vs Run Length ....................................................................................... 23
Open Loop................................................................................................................24
7 OPERATION ...................................................................................................24
7.1 System Operation ...........................................................................................24
7.2 Fault Detection...............................................................................................24
7.3 Test Functions ................................................................................................25
7.4 Jumpers .........................................................................................................25
Voltage & Gas Concentration Level Reference Table: ................................................28
8 CALIBRATION ................................................................................................28
8.1 Calibration Specications ...............................................................................28
Gas ........................................................................................................................... 28
Adapters ..................................................................................................................29
8.2 Calibrating Sensors ........................................................................................29
Calibration Frequency ..............................................................................................29
Gas Testing Frequency (Bump Testing) ..................................................................... 29
8.3 Calibration Procedure .....................................................................................30
9 ACCESSORIES ...............................................................................................33
9.1 Splash Guard ..................................................................................................33
9.2 Calibration Kit ................................................................................................33
9.3 Metal Protective Guard ..................................................................................34
11 TROUBLE SHOOTING ................................................................................36
4 © 2013 All rights reserved. Data subject to change without notice.
LPT - Operation Manual Rev. C | 2013.06
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 qualied electrician or trained technician and according to
instructions indicated in this manual. This instrument should be inspected and calibrated regularly
by a qualied and trained technician. For more information, refer to sections 10 Maintenance and 8
Calibration of this manual.
This instrument has not been designed to be intrinsically safe. For your safety, do not use it in
classied hazardous areas (explosion-rated environments).
INSTRUMENT SERIAL NUMBER:
______________________________________________________
PURCHASE DATE:
______________________________________________________
PURCHASED FROM:
______________________________________________________
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Rev. C | 2013.06 LPT - Operation Manual
1.2 Warranty Policy
• Disconnect power before servicing
• Supply: 24 V
Critical Environment Technologies Canada Inc. (CETCI), also referred to as the manufacturer,
warrants this instrument to be free from defects in materials and workmanship for a period of two
(2) years from the date of purchase.
Individual sensor elements have dierent warranties. Please check with the manufacturer for
specic sensor warranty.
The warranty status may be aected if the instrument has not been maintained and calibrated
as per the instructions indicated in this manual or has been abused or damaged in any way. The
manufacturer is not liable for auxiliary interfaced equipment or consequential damage. This
instrument is only to be used for purposes stated herein.
Warranty does not include third party trouble-shooting costs or freight to / from the manufacturer’s
facility. CETCI’s liability is limited to replacement or repair of the equipment manufactured.
Due to ongoing research, development and product testing, the manufacturer reserves the right to
change specications 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 return merchandise authorization (RMA) number. Contact the
manufacturer for a number and procedures required for product transport.
6 © 2013 All rights reserved. Data subject to change without notice.
LPT - Operation Manual Rev. C | 2013.06
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.
Prior to shipping equipment to CETCI, contact our oce 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. 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.
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.
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Rev. C | 2013.06 LPT - Operation Manual
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.
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 modication 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.
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 eorts to improve its products and their documentation, the
manufacturer reserves the right to make changes at any time without notice. Revised copies of this
manual can be obtained by contacting CETCI or visiting www.critical-environment.com.
Should you detect any error or omission in this manual, please contact CETCI at the following
address:
8 © 2013 All rights reserved. Data subject to change without notice.
LPT - Operation Manual Rev. C | 2013.06
Critical Environment Technologies Canada Inc.
Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada
Toll Free: +1.877.940.8741
Telephone: +1.604.940.8741
Fax: +1.604.940.8745
Email: marketing@cetci.com
Website: www.critical-environment.com
In no event will CETCI, its ocers 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 Low Power Transmitter for electrochemical sensor.
The LPT transmitters are rugged, user-friendly analog gas detection transmitter for use in nonhazardous (non-explosion rated) environments such as, commercial HVAC and light industrial
applications.
A standard transmitter features a green colored LED indicating light for power and fault condition
(refer to section 3.1 Technical Specications), an analog output signal and a standard water / dust
tight enclosure.
Both carbon monoxide (CO) and nitrogen dioxide (NO2) electrochemical sensors are available for
use with this gas detector and operate by diusion. The sensors utilized in this device are accurate
enough to measure to Occupational Health & Safety (OHS) hazardous levels for toxic gases.
© 2013 All rights reserved. Data subject to change without notice. 9
Rev. C | 2013.06 LPT - Operation Manual
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
• 2-wire loop, 3-wire VDC or 4-wire VAC power
• Linear 4 - 20 mA output signal
• Standard water / dust tight enclosure (drip proof)
For splash or hosedown applications, add splash guard
• Single sensor: carbon monoxide (CO) or nitrogen dioxide (NO2)
• RoHS compliant circuit boards
• Easy maintenance
• Economical
• Includes sensor CEF (calibration extending rmware)
• Auto resetting fuse
• Automated calibration procedure
10 © 2013 All rights reserved. Data subject to change without notice.
LPT - Operation Manual Rev. C | 2013.06
3 INSTRUMENT SPECIFICATIONS
3.1 Technical Specications
GAS TYPE
Carbon Monoxide (CO)
Nitrogen Dioxide (NO2)
MECHANICAL
Enclosure ABS / Polycarbonate
Weight 400 g (14 oz)
Size 5.0” x 4.0” x 1.9” (127 mm x 102 mm x 48 mm)
ELECTRICAL
Power Requirement
2-wire mode
3-wire mode
4-wire mode
12 – 30 VDC, 1 Watt
12 – 30 VDC, 1 Watt
12 – 27 VAC, 1 VA
Use Class 2 transformer. See page 22.
Current Draw Maximum 25 mA
Outputs
Linear 4 - 20 mA
Maximum 216 Ω load (wiring plus termination resistor) at 16 VDC
Maximum 316 Ω load (wiring plus termination resistor) at 12 VAC
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Rev. C | 2013.06 LPT - Operation Manual
Wiring
VDC two or three conductor shielded 18 awg stranded
VAC four conductor shielded 18 awg stranded
(refer to Wire Gauge vs. Run Length in section 6.3 Wiring
Connections)
Fuse Automatic resetting thermal
Indicator
Solid Green: Power ON
Flashing Green (50% duty cycle): Warm up
Flashing Green (short OFF, long ON): Fault mode
LED OFF: No Power or 4-20 mA “Open Loop” (unit won’t operate)
ENVIRONMENTAL (sensor dependant)
Operating Temperature -20°C to 40°C (-4°F to 104°F)
Operating Humidity 15 - 90% RH non-condensing
CERTIFICATION
CE Pending
C-Tick Pending
12 © 2013 All rights reserved. Data subject to change without notice.
LPT - Operation Manual Rev. C | 2013.06
3.2 Standard Enclosure Dimensions
1.91” (48.5 mm)
4.0” (101.6 mm)
5.0” (127 mm)
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