Critical Environment Technologies cGas Detector User manual

Brand: Critical Environment Technologies

Model: cGas Detector

Type: User manual

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.

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

4 INSTALLATION

The cGas Ammonia Vent Line Detector is intended to be permanently mounted indoors on

the ammonia vent relief stack above the pressure relief valve.

If the device is not installed within two weeks of delivery, the sensor may require a longer

warm up time to stabilize (approximately 48 hours) and provide accurate readings.

The cGas Ammonia Vent Line Detector should be installed on the vent stack pipe using the

cast steel coupler, no more than 0.3 to 0.6 m / 1 to 2 ft from the discharge stack.

The bottom conduit entry point on the enclosure has been tted with a 12.7 mm / ½ in

water tight cable restraint. If conduit is being used, replace the cable restraint with a liquid

tight type conduit tting. The clearance from the PCA to the base enclosure is 12.7 mm /

½ in. Do not use a conduit connector that has more than 12.7 mm / ½ in of thread length.

If the transmitter must be installed outdoors, it is suggested to use weather proof and UV

protected cable and additional housing to protect it from the elements and low temperatures.

The factory installed splash guard that covers the (unused) sensor vent in the front of the

enclosure protects the device from water and dust ingress. Any water or physical damage

to the transmitter that occurs from the installer drilling installation holes will not be covered

under warranty. If using, the conduit tting at the bottom of the enclosure, it must be the

liquid tight type.

FOR MORE INFORMATION ON INSTALLATION INCLUDING WIRING CONNECTIONS, WIRE

GAUGE AND RUN LENGTH REFER TO THE CGAS-A INSTALLATION MANUAL OR THE

CGAS-D INSTALLATION MANUAL.

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 before they are shipped and should not require

calibration at the time of a routine installation or replacement.

NOTE: 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.

5 CALIBRATION

The cGas Ammonia Vent Line Detector is an equipment protection device, not a life safety

device and should be calibrated every 6 months.

Calibrating the cGas Ammonia Vent Line Detector has 5 processes:

1. Remove Detector from Vent Stack

2. Set Calibration Gas Value

3. Attach Calibration Adapter and Tubing

4. Zero (Null) Calibration

5. Span Calibration

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

NOTE: A calibration label should be applied after every calibration to conrm work performed

and the date it was conrmed. If a controller is involved, the alarm set points should be

indicated on a label on the front door of the enclosure so anyone working in the environment

can be aware.

5.1 Remove Detector from Vent Stack

The cGas Ammonia Vent Line Detector must be removed from the vent stack in order to

calibrate the sensor.

On the back of the device, a long pipe tting is connected with a coupler to the mounting pipe

on the vent stack to secure the device in place. Unscrew the wide ring portion of the coupler

and carefully remove the device from the mounting pipe. Be careful to not handle the device

roughly resulting in disconnecting or loosening the wires.

IMPORTANT: The catalytic sensor is very susceptible to shock - when working with the

sensor do not hit it. Manually loosen then senso. When replacing the tting does not have

to be pressurized, so minimal tightness is all that is required.

sensor

unscrew coupler

careful not to disconnect or loosen

the wires

WARNING: When you remove the device, the vent stack will be exposed and ammonia

may leak into the air. Vent line systems should always be treated with extreme caution and

workers should assume a relief valve could release at any time. Take all necessary safety

precautions and follow industry standard practices and local regulations when calibrating the

cGas Ammonia Vent Line Detector.

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

5.2 Set Calibration Gas Value

Check to make sure that the calibration gas value set in the transmitter matches the gas

concentration of the calibration gas you are using. How much gas the sensor detects is

directly related to the Calibration Gas setting and the actual concentration of calibration gas

used during calibration.

The factory default used to calibrate the cGas Ammonia Vent Line Detector prior to shipping

is 0.5 % vol (5000 ppm) air balance.

From the main display, press ENTER.

Enter passcode 3032 using the UP button and ENTER button.

Enter Password

3032

Press ENTER to access the Calibrate Menu.

Calibrate Menu

Press Enter

In the Selected Channel menu, conrm the desired channel is showing.

Selected Channel

NH3

Press the UP button to accept the displayed calibration gas value if it is correct. Or press

ENTER and change the value using the UP or DOWN buttons.

Calibration Gas

0.5% vol NH3

Calibration Gas

>0.5% vol NH3

When nished pressed ENTER and then ENTER again to conrm and ENTER to exit.

Conrm?

>0.5% vol

5.3 Attach Calibration Adapter with Tubing

The ammonia sensor is potted into a 5 cm / 2 in long pipe tting that protrudes from the

back of the enclosure.

Press the calibration adapter with an O-ring and two zeroing port plugs into the sensor

opening with the tubing attached.

(P/N: CET-7000-CAP)

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

Ammonia is a reactive gas and can adhere to surfaces which can reduce the amount of gas

that reaches the sensor. When calibrating an ammonia sensor use a length of tubing no

longer than 0.6 to 1 m / 2 to 3 ft. If a longer length is necessary, use Teon lined tubing to

ensure the correct concentration of gas reaches the sensor.

5.4 Zero (Null) Calibration

Catalytic sensors require oxygen to work and thus the user MUST ow clean air or oxygen to

obtain a true zero.

NOTE: To exit the Zero Calibration at any time, press ENTER.

From the main display, press ENTER.

Enter passcode 3032 using the UP button and ENTER button.

Enter Password

3032

Press ENTER to access the Calibrate Menu.

Calibrate Menu

Press Enter

In the Selected Channel menu, conrm the desired channel is showing.

Selected Channel

NH3

Press the UP button to nd Calibrate Zero.

Calibrate Zero

100 AD

Press ENTER if using ambient air or attach the regulator to the cylinder of zero air, insert

the calibration adapter into the sensor opening on the front of the enclosure door (refer to

Section 6.3.1 Calibration Adapter Plug if the adapter will not t). Press ENTER to start the

Zero calibration. The display will show a countdown from 20 seconds.

Zeroing

47AD 18s

Zero Success

56AD

When the process has nished and the Zero calibration was accepted, press ENTER and use

the UP button navigate to Exit and press ENTER to exit. Remove the cylinder of zero gas. If

the Zero Calibration was not successful refer to Section 6.3.2 Zero Fault.

5.5 Span Calibration

Span calibration is owing a known concentration of the target gas over the sensor to adjust

the output signal to match the gas concentration. It resets the sensor’s electronic circuit

against a known concentration of target gas to correct drift and keep linearity.

Catalytic sensors require oxygen to work and thus the span gas must have “air” balance, not

N2 balance. The factory default used to calibrate the cGas Ammonia Vent Line Detector prior

to shipping is 0.5 % vol (5000 ppm) air balance.

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

NOTE: To exit the Span Calibration at any time, press ENTER.

From the main display, press ENTER.

Enter passcode 3032 using the UP button and ENTER button.

Enter Password

3032

Press ENTER to access the Calibrate Menu.

Calibrate Menu

Press Enter

In the Selected Channel menu, conrm the desired channel is showing.

Selected Channel

NH3

Use the UP button to nd Calibrate Span. Press ENTER.

Calibrate Span

4000 AD

Conrm the span calibration gas level. It is important to make sure that the span gas level

value matches the calibration gas concentration you are using to calibrate the sensor. Press

ENTER to conrm value is correct. (If the value is not correct, press the UP button to move

the cursor to N and press ENTER. Change the cal gas level using the UP and ENTER buttons.)

Conrm CalGas

>0.5% vol

Press ENTER to conrm. Attach the regulator to the span gas cylinder and ow the span gas

over the sensor. You have 120 seconds to start owing the gas. If the gas isn’t detected, the

display will return to Calibrate Span.

Waiting for Gas

53AD 35s

When the gas is detected the display will show stabilizing for a countdown from 120 seconds

and then spanning for a countdown from 60 seconds.

Stabilizing

1961AD 82s

Spanning

1957AD 21s

Span Success

1956 AD 19

When the process has nished and the Span calibration was accepted, press ENTER and use

the UP button navigate to Exit and press ENTER to exit. Remove the cylinder of span gas. If

the Span calibration was not successful, refer to Section 6.3.3 Span Fault.

5.6 Trouble Shooting Calibration

This section is intended to aid in correcting issues that may arise during the calibration

procedure. If you are unable to correct a problem or you have questions, please contact our

Technical Service Department at [email protected] or 604-940-8741 (Local) or 1-877-940-

8741 (Toll Free).

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

5.6.1 Calibration Adapter Plug Doesn’t Fit

Use a slight twisting motion as you gently push the calibration adapter plug (p/n: CET-7000-

CAP) into the sensor opening. If it is hard to insert, moisten the O-ring seal slightly then try

re-inserting it.

5.6.2 Zero Fault

If the zeroing process fails, the cGas Detector will show a Zero fault. This will happen if the

ambient gas readings are at an unacceptable level due to not enough clean air - there is

enough residual target gas in the environment or other gases that are interfering with the

sensor seeing oxygen.

5.6.3 Span Fault

If the cGas shows a Span fault after trying to calibrate, it is possible that the sensor is dead

or the device isn’t seeing the gas (cylinder is empty, regulator or adapter plug is not attached

properly, tube is blocked, kinked, etc.).

Span Fault

197 AD 1 0s

Check all connections and possible interferences and try a complete calibration procedure

from the beginning again to see if this corrects the fault. If a second calibration does not

resolve the fault then the sensor needs to be replaced. Over time, a sensor degrades and

when it has gone beyond an acceptable level, it has reached its end of life and will no longer

pass a calibration. If replacing the sensor does not correct the fault, please contact Technical

Service at [email protected].

5.6.4 Zero Override

If the gas level (possible residual gas) is too high, but still within the override range, the

display will indicate that an override is required.

Override?

-?????

To override the value use the UP button to select Y and press ENTER. To keep the original

zero value, leave the indicator on N and press ENTER.

5.6.5 Span Override

During the Span calibration, readings are taken and from the results sensitivity is calculated

and compared to the original sensitivity of the sensor at the time of installation. If this

sensitivity is below the override range, but above the fault limit, the display will indicate that

an override is required. To override the value use the UP button to select Y and press ENTER.

To keep the original value, leave the indicator on N and press ENTER.

Override?

1953 AD 19

6 SENSOR REPLACEMENT

p/n: VLT-NH3-SEN

The catalytic ammonia sensor has a lifespan of approximately 2 to 3 years under normal

air conditions. The sensor may need replacing sooner if is is poisoned by exposure to a very

high concentration of ammonia.

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

The replacement sensor comes potted in a 2” pipe with the wires attached to a Plug & Play

smart board that plugs into the main board.

The image in Section 4.3 Interior Enclosure shows the sensor installed.

NOTE: In order to remove the smart board from the interior of the enclosure, the transmitter

needs to be removed from vent stack. For instructions, see Section 5.1 Remove Detector

from Vent Stack.

Open the enclosure, remove the 3 screws connecting the smart board to the main board and

remove the smart board from the main board socket.

With the transmitter is free from the vent stack, unscrew the old sensor pipe from the back

of the transmitter and feed the old smart sensor board through the hole in the back of the

enclosure and remove the old assembly completely.

Feed the wires and new smart board through the hole in the back of the enclosure into the

interior of the transmitter and screw the new sensor pipe assembly into the back of the

transmitter and. Press smart board into the left side socket and replace the 3 screws.

IMPORTANT: The catalytic sensor is very susceptible to shock - when working with the

sensor do not hit it. Manually loosen then senso. When replacing the tting does not have

to be pressurized, so minimal tightness is all that is required.

Reattach the transmitter to the vent stack.

The replacement sensor comes pre-calibrated from the factory and should not require

calibration at the time of a replacement.

NOTE: Temperature affects calibration. If the sensor is being used in an extreme temperature

range, the sensor should be re-calibrated in that temperature range.

If the replacement sensor is not installed within two weeks of delivery, the sensor may

require a longer warm up time to stabilize (approximately 48 hours) and provide accurate

readings.

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

7 MAINTENANCE

There are no serviceable elements other than the calibration instructions outlined in this

manual. There are no replaceable components except the sensor.

The cGas Ammonia Vent Line Detector requires no assembly and very little maintenance.

The transmitter should be regularly inspected and monitored for possible damaging

conditions.

• If in a damp location, source of water should be shielded from continually contacting

the top of the transmitter. It is important to ensure that excess water and/or dust is

not somehow entering the enclosure and physically damaging the circuit board or

internal components.

• If painting is to be conducted in the transmitter’s location the transmitter needs to be

protected from over spray.

• If mounted outside in very cold temperatures (> -20°C / -4°F ), encasing the

transmitter in a suitable insulated box may be necessary

8 TROUBLESHOOTING

cGas Detector won’t power up. (blank display)

Is the power properly connected? Check the wiring connections. Refer to Wiring Connections

in the Installation Manual.

Display shows “SPAN FAULT” message.

Check all connections and possible interferences and try a complete calibration procedure

from the beginning again to see if this corrects the fault. If a second calibration does not

resolve the fault then the sensor needs to be replaced. Check to make sure the gas cylinder

isn’t empty.

Frequent, unexpected alarm signal sent to BAS/DDC.

Check to see if EMI and RF interference is causing the equipment to react this way. Refer to

EMI and RF Interference Considerations in the Installation Manual for more information.

Display shows “COMM” message. Modbus® or BACnet output signal has not been

connected properly; will also occur if no requests are being made from the controller to

the transmitter, ie addressing is not proper. Check the wiring connections and the network

settings.

Device cannot be seen by the Controller and/or the BAS / DDC on the Modbus® network.

Check the Baud rate. All devices in the network must have the same Baud rate.

• Check that local area network wiring is correct, especially the A and B lines to make sure they are not

swapped between devices on the network.

• Check the Modbus® ID. Each device must have a unique ID assigned to it.

Device cannot be seen by the Controller and/or the BAS / DDC on the BACnet® network.

• Check the Baud rate. All devices in the network must have the same Baud rate.

• Check to make sure the device has a unique ID assigned to it, the factory default is made up of the

MAC ID and the Base ID.

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

• Check that local area network wiring is correct, especially the A and B lines to make sure they are not

swapped between devices on the network.

List of Possible cGas Error Codes:

(appears on the display in place of the units for a channel)

CODE DESCRIPTION

F01 Negative Fault Reading

Check to make sure the smart sensor board

is present and installed properly in the socket.

If installed, the cGas detects the sensor signal

is too far below its zeroAD. May be caused

by a sensor that is temperature or humidity

sensitive or the device wasn’t warmed up for

a minimum 24 hours. After appropriage warm

up period, zeroing the sensor will normally

resolve this.

F02 Smart Board Fault

cGas cannot communicate with the smart

board. Ensure the smart board is installed

and installed on the correct side (left) if a

single channel unit. Otherwise power cycle or

replace the sensor smart board.

F03 CO2 Communication Fault

cGas cannot communicate with the CO2

sensor even though it can communicate with

the smart board. Power cycle or replace the

sensor smart board.

F04 POT chip has failed The internal smart sensor board gainPOT

chip has failed. If a power cycle does not

resolve this, replace the sensor smart board.

F05 Error in reading Smart Board cGas detected an error in the smart board

ID. Use “Write to Sensor” for the indicated

channel (passcode 3022).

FO6 SB ID Mismatch Firmware expected a different smart board

than what is in the sensor socket.

FO7 RH & Temp Fault

cGas cannot communicate with the sensor.

Ensure the smart board is installed correctly.

If unresolved, contact our Technical Support

Department

FO8 DAC COMM This is a hardware fault. Contact our

Technical Support Department.

F20 RLY GPIO chip is not

responding

Check to make sure the relay board is

present and installed properly in the

socket. If installed, main board is unable to

communicate with the relay board and may

be damaged A replacement relay board may

be required.

CGAS-VLT-20220902

Unit 145, 7391 Vantage Way, Delta, BC V4G 1M3 Canada

Tel: +1.604.940.8741 Toll Free: +1.877.940.8741

www.critical-enviroment.com

SAFER AIR EVERYWHERE.

Critical Environment Technologies cGas Detector User manual

Brand: Critical Environment Technologies

Model: cGas Detector

Type: User manual

Download PDF

report

Critical Environment Technologies cGas Detector User manual

Critical Environment Technologies cGas Detector User manual

Related papers

Other documents