PTI SENTRY 1510 - Diagnosing Unstable Exhaust Pressure

11984 Rev 01 Page 2 of 5
6.1 Troubleshooting
Measured Exhaust is not stable
Is the supervisor power
on?
Replace Sentry 1510
Are all downstream
dampers fully open?
Fully open all dampers.
No
Is N2 Supply on and
between 40 - 90 PSI?
Is process pressure
sense line connected?
Is process chamber fully
sealed?
Check all fittings on
process side of the
Sentry 1510 for leaks.
Yes
Yes
Yes
Yes
Turn on N2 and adjust
regulator for 40 -
90 PSI
Connect process sense
line
Seal chamber
Eliminate leaks
Yes
No
No
No
No
Is the P-
Trap filled with
fluid or drain isolation
valve closed?
Fill P-Trap or close
isolation valve
No
Yes
Set Gain to Zero
Optimize Gain Setting
(See procedure at end of
this appendix.)
Control
Control
Turn on supervisor
Yes
Control
Control stable