Hazardous Area Operation
Troubleshooting
A-24
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
Thermo Fisher Scientific
Symptom*
Possible Cause
Action
2. Purge timer starts but
resets, or enclosure power
not switched on at end of
purge.
a. Purge flow depletes
supply and causes pressure
drop.
Check pressure at
instrument. Increase line
capacity (bigger diameter
line, shorter line length, or
different air source).
3. Initial purge generally
correct, but controller
occasionally trips out
enclosure power / alarm.
a. Intermittent air supply
fault.
Check for other equipment
using the same air supply,
which may cause pressure
drops.
Monitor air supply
pressure. Check air supply
capacity is not marginal.
Modify air supply as
required.
b. Enclosure pressure too
close to set point.
Treat as possible causes
(b), (c), and (e) listed for
symptom 1.
Adjust pressure set point
only after carrying out other
checks.
c. Intermittent controller fault. Treat as possible cause (e)
for symptom 1 and possible
cause (a) for symptom 2.
Purge actual time not as set.
Timer faulty.
Contact factory.
*Note: The description of the symptom applies to European and X-Purge systems.
In the case of Z-Purge systems, some of the points are not applicable, and the
following points should be noted.
The enclosure power trip is replaced by a purge fail alarm.
There is no automatic initial purge. The indicators should be observed to
find out if the enclosure pressurisation has been sensed or the safe purge
detected.
