Addendum for cGas Detector Operation Manual Rev. B | 2022.09 cGas Detector Ammonia Vent Line Transmitter www.critical-environment.
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 modified 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 specific information for the installation and calibration of the cGas Ammonia Vent Line Detector models.
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 ..............................................................................................................................
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.
Rev. B | 2022.09 cGas Ammonia Vent Line Transmitter - Addendum 2 INSTRUMENT SPECIFICATIONS 2.1 Technical Specifications 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.
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.
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.
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.
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 fitting 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.
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 fitting 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.
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.
cGas Ammonia Vent Line Transmitter - Addendum Rev. B | 2022.09 NOTE: A calibration label should be applied after every calibration to confirm work performed and the date it was confirmed. 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.
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.
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 Teflon lined tubing to ensure the correct concentration of gas reaches the sensor. 5.
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, confirm the desired channel is showing. Selected Channel NH3 Use the UP button to find Calibrate Span. Press ENTER.
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-7000CAP) 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.
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.
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.
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.
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