User Manual

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.