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5. TROUBLESHOOTING
The following table contains the information needed to make a quick analysis of problems
that may occur with the ST450EC gas detector. In case of doubt and/or severe problems,
please contact the Consilium service department or a Consilium authorised service centre.
The output signal
does not
correspond with
the expected value
Gas detector is connected as a 3-
wire (24Vdc/GND/Sig)
Connect sensor as 2 wire
(+24Vdc/Sig)
The gas detector is not (correctly)
calibrated
Calibrate the sensing head
The gas detector is not (correctly)
connected
Check the connections of the
sensing head
The sensor is not (correctly)
connected
Check the sensor connections
Contact Consilium Service
department
Display reading on the
control module does
not correspond with
applied gas
concentration
The gas detector is not (correctly)
calibrated
Check SPAN gas set point and re-
calibrate the gas detector
The gas detector is not correctly
connected
Check the sensing head
connections
Sensor is not (correctly) connected
Check the sensor connections
Gas detection control unit is not
correctly configured
Contact Consilium Service
department
Contact Consilium Service
department
The gas detection control
system produces an
alarm while no gas is
present
The gas detector is not (correctly)
connected
Check the connections of the
sensing head.
No screened connection cable is
used
Use screened connection
cable with a tinned
copper screening
The screening of the connection
cable is not correctly connected
Connect the screen within the
cable gland of the sensing head
and the cable gland of the gas
detection control unit (as star
ground)
The sensors are not isolated from
local ground
Ensure the sensing head
enclosure does not make any
contact with an electrical
conductive surface
The connection cable is not
connected properly.
Ensure the cable is installed in
separate cable conduits, away
from possible interference
sources.
Replace the detector cell.
Contact the Consilium Service
department.
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