GASMAX II Operation & Maintenance Manual, Revision 7.0
Page 19
REMOTE COMBUSTIBLE SENSOR WIRING (CH 2)
GASMAX II monitors with remote-mount bridge-type sensors are shipped in two pieces and sensor wiring
must be installed by the end user. Bridge-type sensors have a more robust output and can be mounted up
to 100 feet from the GASMAX II. Cable used should be
three-wire stranded with foil shield
and should be
run inside metallic rigid conduit where possible
. GDS Corp recommends Belden B8771. The cable shield
must be connected to an earth ground at ONE END ONLY. Remote bridge sensors connect
to “TB
1
”
on the
IO/Power Supply board
,
located on the
back of the explosion proof enclosure
(See Fig 4-8).
NOTE: Poured seals and rigid conduit are required if the remote sensor is installed in a hazardous area.
WARNING
: REMOTE BRIDGE SENSORS DO NOT AUTOMATICALLY ADJUST SENSOR EXCITATION VOLTAGE.
IF SWITCHING SENSOR
TYPES
, BE SURE TO ADJUST SENSOR VOLTAGE
BEFORE
INSTALLING A NEW
SENSOR.
Figure 3-12: Remote Bridge Sensor Connection
TB
-
C
-
for C MB TIB , C or PI
-
-
C for YG or T IC G
— —C
—C—
ibbon to isplay
I Power upply
Bridge ensor
C
M
C
T
P
T
T
G
TB
TB
GMII TB “ ” to
-
box “ ”
GMII TB “C M” to
-
box “C”
GMII TB “ CT” to
-
box “ ”
10-0233
I/O Power Supply with Bridge Input
