Chapter 9 - Troubleshooting
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MNL000537
Revision 0
10/03/2017
BSGS eV / BULKGUARD eV
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
Confidential and Proprietary Data
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Versum Materials Confidential
Process Heater Alarms (If Present)
Low J-T Heater Temperature
Probable Cause
Corrective Action
Heater temperature below the low
setpoint.
Check the operation of the heater controller. Re-adjust
as necessary.
A momentary low temperature alarm may be caused by
a drastic increase in flow rate and is considered normal.
The PID controller is a reactionary device and cannot
anticipate the additional demand on the J-T heater.
High J-T Heater Temperature
Probable Cause
Corrective Action
Heater temperature above the high set-
point.
Check the operation of the heater controller. Readjust as
necessary.
A momentary high temperature alarm may be caused by
a drastic decrease in flow rate and is considered normal.
The PID controller is a reactionary device and cannot
anticipate the lack of demand on the J-T heater.
A temporary overshoot as the heater block warms at
startup or following an extended shutdown is also
considered normal. The alarm can be reset after the
heater block is thermally saturated (typically within 15
to 30 minutes).
