C
12-17 Combustible Gas Transmitter
6
O&M Manual
Rev-D
INSTALLATION
Combustible gas sensor/transmitters are explosion-proof assemblies that are normally mounted
directly to suitable explosion-proof conduit. To maintain the explosion-proof integrity of the transmitter, a
suitable cable entry seal must be used in accordance with the applicable electrical code.
Sensor/transmitters should be mounted with the sensor facing down as shown in Figure 2.
NOTE: Gas sensors are shipped with a protective plastic cap over the end. This cap should be left in
place to avoid damage to the sensor during installation. If the detection system is to be activated within a
few days of installation, the cap should be removed when installation is complete. Otherwise, leave the
cap in place until the system is to be placed in service.
Be sure to leave the protective cap on the
sensor if painting is to be done in the area of the sensor.
Series C12-17 transmitters require connection to a DC power supply and connection of the 4-20
mA output to a receiving device such as a computer, recorder, or data logger. A 3-conductor cable may
be used for this purpose and is made at the terminals marked TB1 on Figure 3. Transmitters with the
optional display and relay may use a 2-wire connection if only the local relay is to be used. If the 4-20 mA
output is to be used, a 3-wire connection is needed.
Figure 2 - Combustible Gas Sensor/Transmitter Dimensions (ATI-046)
