24
© 2020 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Operation Manual
Rev. B | 2020.07
12 VAC
316 (assume a
200 Ω termination
resistor)
20
5,600
18
8,900
16
13,583
NOTE:
The termination resistor could be as high as 500 Ω (10 volt
measurement at 20 mA). A poor quality 24 VAC transformer might supply as
little as 14 volts at low line conditions.
7 SYSTEM OPERATION
The cGas Detector continuously monitors CO
2
gas concentrations on one
configured channel. It must be connected to a controller (ie. QCC, FCS, CGAS-
SC), control panel or BAS / BMS / DDC system; the cGas Detector is not a
standalone gas detection system.
7.1 Power Up and Warm-up Process From Factory
Upon application of power to a cGas Detector shipped from the factory, the LCD
display will turn on and rotate through several info screens that differ depending
on the configuration of the transmitter. The warm-up period takes between 2
and 5 minutes depending on the gas sensors type.
NOTE:
The cGas Detector will be visible on the controller / BAS / DDC system
during the warm-up countdown but a correct reading will not show up until the
unit has finished the warm-up period and the sensor(s) has stabilized.
All alarms will be disabled during the system warm-up period. After the warm-
up period, the system may exhibit gas alarm condition(s) if the sensor has not
completely stabilized during the warm up period. This is normal and the length
of time the gas alarms exist is dependent upon the length of time since the unit