PTI SENTRY 1510 - Troubleshooting Pressure Exceeding Set Point

11984 Rev 01 Page 3 of 5
6.1 Troubleshooting
Measured Process Pressure is Greater Than Set point
Is set point
controlled locally at
the supervisor or
via the analog 0-5
VDC?
0-5
Ensure StptMode is set
to Single and SP1
equals your desired set
point.
Local
Ensure StptMode is set
to Analog
Verify connections to
your process tool.
(See Figure 6-1 for
basic wiring)
Yes
Verify that proper
voltages are present on
P2 of the supervisor
Yes
Replace Supervisor
Yes
Is the supervisor power
on?
Turn on supervisor
power
Is the desired set point
indicated next to Pres
SP?
No
Yes
No
Set Supervisor
Parameter StepLim
to Off
Is the supervisor
Parameter Step Limit
Off?
No
Yes
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