Critical Environment Technologies CGAS-A-VLT-NH3-S Instructions d'installation et d'utilisation

www.critical-environment.com

cGas Detector

Ammonia Vent Line Transmitter

Rev. B | 2022.09

Addendum

for cGas Detector Operation Manual

cGas Ammonia Vent Line Transmitter - Addendum Rev. B | 2022.09

IMPORTANT INFORMATION

The cGas Ammonia Vent Line Gas Detector is either a CGAS-A (analog) or a CGAS-D (digital)

Gas Detector that has been physically modied to mount on a vent line stack. How it

operates is the same as its corresponding base model, the CGAS-A or CGAS-D Gas Detector.

This document is an addendum and contains specic information for the installation and

calibration of the cGas Ammonia Vent Line Detector models.

For more information on wiring connections, wire gauge and run length, refer to the CGAS-A

Installation Manual or the CGAS-D Installation Manual

Refer to the cGas Detector Operation Manual for information on:

• Policies

• Warranty

• Copyrights

• Basic Operation and Instrument Settings

• Display Settings

• Alarm Status and Fault Settings

• Alarm Setpoints

• Enable/Disable Channel

• Relay Operation

• Test Functions

• Modbus and BacNet Conguration (digital model)

cGas Ammonia Vent Line Detector Part Numbers:

• CGAS-A-VLT-NH3-S

• CGAS-D-VLT-NH3-S

INSTRUMENT SERIAL NUMBER:

______________________________________________________

PURCHASE DATE:

______________________________________________________

PURCHASED FROM:

______________________________________________________

If you have questions, comments or require more information, please contact us at:

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

Email: [email protected]

Website: www.critical-environment.com

Rev. B | 2022.09 cGas Ammonia Vent Line Transmitter - Addendum

TABLE OF CONTENTS

1 INTRODUCTION ................................................................................................. 4

1.1 General Description..................................................................................................................4

1.2 Key Features..............................................................................................................................4

2 INSTRUMENT SPECIFICATIONS........................................................................ 5

2.1 Technical Specications .........................................................................................................5

2.2 Enclosure Dimensions............................................................................................................. 7

2.3 Exterior Enclosure - Front .......................................................................................................8

2.4 Exterior Enclosure - Back........................................................................................................9

2.5 Interior Enclosure .....................................................................................................................9

3 SENSOR SPECIFICATIONS AND CONSIDERATIONS........................................ 10

4 INSTALLATION ................................................................................................ 11

5 CALIBRATION .................................................................................................. 11

5.1 Remove Detector from Vent Stack .....................................................................................12

5.2 Set Calibration Gas Value .....................................................................................................13

5.3 Attach Calibration Adapter with Tubing .............................................................................13

5.4 Zero (Null) Calibration............................................................................................................14

5.5 Span Calibration .....................................................................................................................14

5.6 Troubleshooting Calibration.................................................................................................15

5.3.1 Calibration Adapter Plug Doesn’t Fit ......................................................................16

5.3.2 Zero Fault ....................................................................................................................16

5.3.3 Span Fault ...................................................................................................................16

5.3.4 Zero Override..............................................................................................................16

5.3.5 Span Override .............................................................................................................16

6 SENSOR REPLACEMENT ................................................................................. 16

7 MAINTENANCE................................................................................................ 18

8 TROUBLESHOOTING........................................................................................ 18

cGas Ammonia Vent Line Transmitter - Addendum Rev. B | 2022.09

1 INTRODUCTION

1.1 General Description

The cGas Ammonia Vent Line Detector is designed for continuous monitoring of ammonia

levels in the vent line of refrigeration systems, including the detection of equipment failure in

ammonia plant vent stack applications.

Using a a ¾” cast steel coupler, the cGas Ammonia Vent Line Detector is to be mounted

indoors on the ammonia vent relief stack above the pressure relief valve.

IMPORTANT: The cGas Ammonia Vent Line Detector is NOT designed to monitor ammonia

in applications requiring human health safety levels detection and is not designed to protect

people from toxic gas concentrations. The lowest reading the sensor will detect is above the

recommended exposure limit to ammonia.

NOTE: CET manufactures other ammonia gas detectors that meet human health safety

levels, if that is the required application. If you have any questions, please do not hesitate to

contact our service department for technical support.

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).

The cGas Ammonia Vent Line Detector is not intended for use in hazardous rated areas.

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

contact our service department for technical support.

1.2 Key Features

• Single channel, internal catalytic Ammonia sensor

• 4-20 mA output (CGAS-A-VLT model)

• Field congurable BACnet® MS/TP RS-485 or Modbus® RTU RS-485 digital output

signal (CGAS-D-VLT model)

• 24 VDC or VAC power (ground referenced)

• Easy Plug & Play Smart Sensor replacement at end of life, comes pre-calibrated

• Bright LCD display

• USB port for conguration changes and rmware upgrades

• 1 optional 2A SPDT dry contact relay (Option -RLY)

• Optional low temperature operation package (Option -LT)

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

• Thermal resetting fuses

• RoHS compliant circuit board

Rev. B | 2022.09 cGas Ammonia Vent Line Transmitter - Addendum

2 INSTRUMENT SPECIFICATIONS

2.1 Technical Specications

SENSOR

Sensor Type Catalytic

Gas Type Ammonia (NH3)

Range 0 - 3.00% volume range

Measures to 2 decimal places, tolerant to 17% volume

Response Time T90 < 30 seconds

MECHANICAL

Enclosure ABS / Polycarbonate, IP54 rating with splash guard installed.

Copper coated interior to reduce RF interference.

Weight 825 g / 29 oz

Size

Detector with splash guard:

127 x 127 x 84 mm / 5.0 x 5.0 x 3.3 in

Completely assembled product:

127 x 127 x 182.5 mm / 5.0 x 5.0 x 7.18 in

Coupler 19.5 mm / 3/4 inch NPT, cast steel

Sensor Assembly Length

(including coupler) 98.5 mm / 3.875 inches

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

Display (low temp) 2-line by 16-character OLED display for low temperature

applications (with Option -LT)

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

cGas Ammonia Vent Line Transmitter - Addendum Rev. B | 2022.09

ELECTRICAL

Power Requirement

16 - 30 VDC, 3 W, Class 2

12 - 27 VAC, 50-60 Hz, 3 VA, Class 2

24V recommended. Refer to Section 6.7 Wiring Connections

Wiring

CGAS-A-VLT model

VDC (or ground referenced AC): 3-conductor 18 AWG (or

larger) shielded, stranded within conduit

VAC 4-conductor shielded 18 AWG stranded within conduit

Wiring

CGAS-D-VLT model

VDC or VAC (ground referenced) 4-conductor shielded 16 AWG

stranded within conduit, network wiring (daisy-chain)

Fuses Automatic resetting thermal

INPUT/OUTPUT

Analog Output

CGAS-A-VLT model One Linear 4 - 20 mA output, signals gas reading

RH & Temperature

(Option -RHT)

User selectable units (oC or oF) with user selectable display or

hide readings

Digital Output

CGAS-D-VLT model

User congurable in the eld, BACnet® MS/TP (version 1 rev

14) RS-485 or Modbus® RTU (version 1.1b3) RS-485

Relay (Option -RLY) Optional SPDT dry contact relay, rated 30 volts @ 2 amps

ENVIRONMENTAL

Operating Temperature 0°C to 40°C / 32°F to 104°F (standard)

-40°C to 40°C / -40°F to 104°F (with Option -LT)

Operating Humidity 15 - 90% RH non-condensing

Pollution Degree Degree 2

Altitude below 2,000 m

CERTIFICATION

Model: CGAS-A-VLT-NH3-S or CGAS-D-VLT-NH3-S

S/N: CGASA1807B00010

Rating: 16-30 VDC, 3W, Class 2

12-27 VAC, 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.

Rev. B | 2022.09 cGas Ammonia Vent Line Transmitter - Addendum

Conforms to: CSA-C22.2 No. 205-12, UL508 (Edition 18):2018

Conforms to: EMC Directive 2014/30/EU, EN 50270:2015, 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.

2.2 Enclosure Dimensions

cGas Ammonia Vent Line Transmitter - Addendum Rev. B | 2022.09

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.

2.3 Exterior Enclosure - Front













NUMBER FEATURE FUNCTION

Door Hinge Secures door to base and allows easy

opening and closing

Display LCD display (standard display shown)

Splash Guard Covers unused sensor vent, protects

from water/dust ingress, IP45 rated

Door Screw Secures door shut

Lock Slot For security padlock or tie

13mm / 1.5 in water tight

cable restraint

Water tight conduit entry for shielded

18 awg stranded cable. For outdoor

applications, weather proof and UV

protected cable is suggested.

Rev. B | 2022.09 cGas Ammonia Vent Line Transmitter - Addendum

2.4 Exterior Enclosure - Back

The sensor is potted into a 5 cm / 2 in long pipe tting that protrudes from the back of the

enclosure.













NUMBER FEATURE

5 cm / 2in pipe with potted sensor, screws into the cast steel mounting

plate

Cast steel sensor mounting plate

19 mm / 3/4 in cast steel coupler for connecting to mounting pipe

13 mm / 1/2 in water tight cable restraint. If using conduit, replace with

liquid tight type conduit tting.

2.5 Interior Enclosure

The sensor is potted behind the enclosure and wires pass from the back of the enclosure

into the interior of the enclosure and connect to a smart board that is plugged into the main

board.

cGas Ammonia Vent Line Transmitter - Addendum Rev. B | 2022.09

Be careful not to trap the wire outside the enclosure when closing the door.

3 SENSOR SPECIFICATIONS AND CONSIDERATIONS

The cGas Ammonia Vent Line Detector comes with a catalytic ammonia sensor potted inside

the 5cm / 2 in long pipe tting that protrudes from the back of the enclosure.

The ammonia sensor has a standard measurement range of 0 - 3.00% vol or 0 - 30,000 ppm.

The ammonia sensor has a lifespan of approximately 2 to 3 years in air. Exposure to very

high concentrations of ammonia (>17 %vol) should be avoided. A large release of a high

concentration of ammonia may burn out the sensor and it will need to be replaced.

If you install and power up the cGas Ammonia Vent Line Detector as soon as it arrives, the

sensor will require about a 5 minute warm up period. The sensor goes through a burn in

period at our factory so it is ready for operation upon arrival. If the device is not installed

within two weeks of delivery, the sensor may require a longer warm up time to stabilize and

provide accurate readings (approximately 48 hours).

During calibration, when owing span gas on an ammonia sensor, if the reading climbs

higher than the calibration point after applying gas for 3 minutes, use that reading as the

calibration point.

Silicone, lead and chlorinated hydrocarbon vapours can poison catalytic sensors.

Temperature affects 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,

calibration should be done in that same temperature range.

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