Critical environment technologies Cgas-a series User manual

Rev. B | 2020.22

www.critical-environment.com

CGAS-A CO2Detector

Analog Transmitter

Installation & Operation Manual

cGas Detector Analog Transmitter - Operation Manual Rev. B | 2020.07

TABLE OF CONTENTS

1 POLICIES .......................................................................................................5

1.1 Important Note....................................................................................... 5

1.2 Warranty Policy ...................................................................................... 6

1.3 Service Policy ......................................................................................... 6

1.4 Copyrights .............................................................................................. 7

1.5 Disclaimer............................................................................................... 7

1.6 Revisions ................................................................................................ 8

2 INTRODUCTION .............................................................................................9

2.1 General Description................................................................................ 9

2.2 Key Features........................................................................................... 9

3 INSTRUMENT SPECIFICATIONS..................................................................10

3.1 Technical Specications...................................................................... 10

3.2 Enclosure Dimensions......................................................................... 13

4 SENSOR SPECIFICATIONS ..........................................................................13

4.1 Available Internal Gas Sensors ........................................................... 13

4.2 Optional RH & Temperature Sensor (Option -RHT) ............................ 14

5 INSTRUMENT FEATURES ............................................................................14

5.1 Exterior Enclosure................................................................................ 14

5.2 Interior System Layout......................................................................... 15

6 INSTALLATION ............................................................................................16

6.1 General Safety Warnings ..................................................................... 17

6.2 Protection Against Electrical Risks..................................................... 17

6.3 Protection Against Mechanical Risks................................................. 17

6.4 Mounting the Transmitter.................................................................... 18

6.4.1 Wet Environment Considerations ................................................ 19

Rev. B | 2020.07 cGas Detector Analog Transmitter - Operation Manual

6.4.2 EMI and RF Interference Considerations ................................... 19

6.4.3 Mounting Height.............................................................................. 20

6.5 Enclosure Mounting Components ...................................................... 20

6.5.1 Enclosure Base................................................................................ 20

6.5.2 Enclosure Bottom ........................................................................... 21

6.6 Wiring Connections.............................................................................. 21

6.6.1 Analog Wire Gauge vs Run Length.............................................. 23

7 SYSTEM OPERATION...................................................................................24

7.1 Power-up and Warm-up Process from Factory.................................. 24

7.2 Navigating the Menu Structure ........................................................... 25

7.3 Accessing the Menu with Passcodes................................................. 25

7.4 Display Settings.................................................................................... 27

7.4.1 Adjust Display Brightness ............................................................. 27

7.4.2 Display Information - Normal or Minimal................................... 28

7.4.3 Display or Hide Gas Channel, RH + Temperature Readings ... 28

7.5 Alarm Status, Fault Detection and Communication Failure Alerts ... 29

7.6 Enable / Disable Channels................................................................... 30

7.7 Setting Channel Alarm Setpoints, Direction and Hysteresis ............. 31

7.8 Change Units (oC or oF) of Temperature Readings............................. 34

7.9 Temperature and / or Relative Humidity Offset ................................. 35

7.10 Set Analog Output Mode ................................................................... 36

7.11 Test Analog Output............................................................................ 37

8 PLUG & PLAY SMART SENSOR REPLACEMENT..........................................38

8.1 How to Install a Replacement Smart Sensor ..................................... 38

8.2 Read from Sensor ................................................................................ 39

8.3 Write to Sensor..................................................................................... 39

9 CALIBRATION ..............................................................................................40

9.1 Calibration Specications.................................................................... 40

9.1.1 Gas..................................................................................................... 40

cGas Detector Analog Transmitter - Operation Manual Rev. B | 2020.07

9.1.2 Regulators & Flow........................................................................... 41

9.1.3 Adapters ........................................................................................... 41

9.1.4 Calibration Frequency .................................................................... 41

9.1.5 Gas Testing Frequency (Bump Testing) ..................................... 42

9.2 Calibrating the Internal Sensor............................................................ 42

9.2.1 Set Calibration Gas Value.............................................................. 42

9.2.2 Zero (Null) Calibration .................................................................... 43

9.2.3 Span Calibration.............................................................................. 44

9.3 Troubleshooting Zero and Span Calibration....................................... 45

9.3.1 Calibration Adapter Plug Doesn’t Fit ........................................... 46

9.3.2 Zero Fault.......................................................................................... 46

9.3.3 Span Fault......................................................................................... 46

9.3.4 Zero Override ................................................................................... 47

9.3.5 Span Override .................................................................................. 47

9.4 Calibrating the Analog Output (requires a 4-20 mA meter)............... 47

9.4.1 Set Analog Output Zero / Set Analog Output Range................ 48

10 ACCESSORIES ...........................................................................................49

10.1 Splash Guard (Option -S)................................................................... 49

10.2 Calibration Adapter Clip ”Cal Clip” .................................................... 49

10.3 Metal Protective Guard...................................................................... 50

10.4 Calibration Kit..................................................................................... 50

11 MAINTENANCE .........................................................................................51

12 TROUBLE SHOOTING.................................................................................52

Rev. B | 2020.07 cGas Detector Analog Transmitter - Operation Manual

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.

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:

______________________________________________________

cGas Detector Analog Transmitter - Operation Manual Rev. B | 2020.07

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. 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 affected 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 Environment Technologies is not liable for auxiliary

interfaced equipment or consequential damage.

Prior to shipping equipment to CETCI, contact our oce for an RMA #. All

returned goods, regardless of reason, must be accompanied with an RMA

number. Please read our Warranty and Returns Policy and follow our RMA

Instructions and Form.

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

Rev. B | 2020.07 cGas Detector Analog Transmitter - Operation Manual

may contact the distributor from whom it was purchased or you may contact

CETCI directly.

Prior to shipping equipment to CETCI, contact our oce for an RMA #. All

returned goods, regardless of reason, must be accompanied with an RMA

number. Please read our Warranty and Returns Policy and follow our RMA

Instructions and Form.

If the product is deemed repairable, for liability reasons, CETCI will perform all

necessary repairs to restore the instrument to its 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.

BACnet® is a registered trademark of American Society of Heating,

Refrigeration and Air Conditioning (ASHRAE).

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

cGas Detector Analog Transmitter - Operation Manual Rev. B | 2020.07

products meet this requiremen and 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 efforts 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, 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: [email protected]

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.

Rev. B | 2020.07 cGas Detector Analog Transmitter - Operation Manual

2 INTRODUCTION

2.1 General Description

Thank you for purchasing our cGas Detector Analog Transmitter, a single

channel CO2 gas detection designed for use in non-explosion rated, commercial

applications that require continuous monitoring of Carbon dioxide. It offers one

4-20 mA analog output and is ideal for applications where compressed CO2is

used and stored, climate control in commercial buildings and other processes

requiring the continuous monitoring of CO2.

The sensors utilized in this device are accurate enough to measure to

Occupational Health & Safety (OHS) hazardous levels for toxic gases. The

transmitter operates by diffusion.

2.2 Key Features

• Single channel, single gas CO2

• 4 - 20mA analog output (signals gas reading)

• Easy Plug & Play Smart sensor replacement at end of life

• Pre-calibrated replacement sensors

• 3-wire VDC or 4-wire VAC power, 24 volt DC or AC power (nominal)

• In eld upgradable rmware/conguration via USB connection

• Bright LCD display

• Option -RHT: Relative Humidity and Temperature sensor (for display only)

• Option -S: Splash guard, factory installed, IP54 rated enclosure

• Standard water / dust tight, corrosion resistant enclosure (drip proof)

• Copper coated interior to reduce RF interference

• RoHS compliant circuit boards

• Auto resetting fuse

cGas Detector Analog Transmitter - Operation Manual Rev. B | 2020.07

If after reading through the manual, you have any questions, please do not

hesitate to contact our service department for technical support.

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

Conduit Entry Points 12.7 mm / 1/2 in diameter

Mounting Holes

4.47 mm / 0.175 in diameter

maximum head diameter 8 mm / 0.32 in, #8 or 4

mm screw

USER INTERFACE

Display (standard) 2-line by 16 character graphic LCD, user congurable

to suppress reading display

USB Port Internal port for USB memory stick connection for

eld conguration/rmware upgrades

Push Buttons Initiate calibration and menu options with internal UP,

DOWN and ENTER push buttons

Audible Alarm none

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