Consilium ST650EX - Troubleshooting Common Issues

ST650EX / ST650-CO
2
/ ST350EX
v3.16
28
5. TROUBLESHOOTING TABLE
The following table offers the information needed to make a quick analyses of possible problems
that may occur with the ST650EX / ST650-CO
2
/ ST350EX sensing head. In case of doubt and/or
severe problems, do contact the Consilium service department or a Consilium authorised service
centre.
Malfunction Cause Solution
During calibration, the mA
signal does not change when
turning the ZERO or SPAN
potentiometer.
Calibration-lock is still active
or reactivated
Deactivate the calibration
lock.
Calibration
value cannot be
higher or lower
Sensor is out of date or
broken
The output signal does not
agree with the expected value
The sensing head is not
(correctly) calibrated
Calibrate the sensing head
The sensing head is not
connected correctly
Check the connections of the
sensing head
Sensor is not (correctly)
connected
Check the sensor connections
Electronic defect Check with the Consilium
Service department
Display reading on the control
module does not correspond
with the applied gas
concentration
The sensing head is not
(correctly) calibrated
Calibrate the sensing head
The sensing
head is not
correctly connected
Che
ck the sensing head
connections
Sensor is not (correctly)
connected
Check the sensor connections
Gas detection control u
nit is
not correctly configured
Check with
the
Consilium
Service department
Electronic defect
Check wit
h the
Consilium
Service department
The gas detection control
system produces an alarm
while no gas is present
The sensing head is not
(correctly) connected
Check the connections of the
sensing head.
No sc
reened 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