GASMAX II Operation & Maintenance Manual, Revision 7.0
Page 44
8
TROUBLESHOOTING
LOCAL SMART TOXIC SENSOR NOT RECOGNIZED
•
If a locally connected toxic sensor is not recognized on power-up or when installed, verify that
the sensor cable is plugged in as shown in the section on local toxic sensors and that channel 1 is
turned on in the Transmitter config menu.
TOXIC SENSOR INDICATES FAULT OR OVERRANGE
•
Certain toxic sensors indicate off-scale low or high at power up and quickly drift towards zero.
This is normal behavior.
•
Toxic sensors showing constant FAULT: If local, remove sensor and examine for moisture or
discoloration. Replace sensor if wet or discolored. If remote, check sensor cable and junction box
for moisture or standing water. Remove sensor and examine for moisture or discoloration.
FAULT indication generally indicates sensor useful life is exhausted.
•
Toxic sensors left unpowered for more than 3 months are subject to accelerated degradation and
may demonstrate a permanent loss of sensitivity.
TOXIC SENSOR WILL NOT CALIBRATE
•
Sensor reading during zero calibration exceeds upper limit of zero
–
sensor is defective and
should be replaced.
•
Sensor reading during span calibration too low
–
sensor may be defective. However, it may be
possible to
temporarily
continue operation by increasing PREAMP GAIN. See Section 8.2 for
more details.
LOCAL SMART BRIDGE SENSOR NOT RECOGNIZED
•
If a locally connected bridge sensor is not recognized on power-up or when installed, verify that
the sensor cable is plugged in as shown in the section on local bridge sensors and that channel 2
is turned on in the Transmitter config menu.
BRIDGE SENSOR INDICATES FAULT OR OVERRANGE
•
Catalytic bead combustible sensors generally indicate off-scale high at power up and quickly drift
towards zero as they reach operating temperature. This is normal behavior.
•
Combustible sensors showing constant FAULT may have drifted below FAULT alarm level. Try
readjusting SENSOR BALANCE to clear FAULT. If unsuccessful, replace sensor.
•
Combustibles sensors showing constant OVERRANGE may have defective bead. If remote, check
wiring for correct excitation voltage at sensor. Replace sensor.
BRIDGE SENSOR WILL NOT CALIBRATE
•
Sensor reading during zero calibration exceeds limits
–
readjust SENSOR BALANCE to reset zero if
possible. If not, sensor is defective and should be replaced.
•
Sensor reading during span calibration too low
–
sensor may be defective. However, it may be
possible to
temporarily
continue operation by increasing PREAMP GAIN. See Section 8.2 for
more details.
