PTI SENTRY 1510 - Troubleshooting Pressure Below Set Point

11984 Rev 01 Page 4 of 5
6.1 Troubleshooting
Measured Pressure is Less 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