36 Sentry Equipment Corp
Troubleshooting Guide
Applying excessive torque on the PRV Shaft or PRV coupling will result in damage to the unit.
Follow the appropriate procedure when dislodging PRV.
Table 5. Troubleshooting Guide
Symptom Possible Problem(s) Remedy
Elevated Sample
Temperature
Loss of cooling water ow
Increase in cooling water
inlet temperature
Scaled cooler
Increased sample ow
Check cooling water supply
Reduce cooling water
temperature or increase ow
Chemically clean (see cooler
maintenance)
Adjust sample ow rate
Reduced Sample
Flow
Plugged line
BPR/RV failure
Blowdown line and exercise
ow control valve
See leaking BPR/RV
Leaking Valve
Stems
Loose or worn packing Tighten packing nut or replace
packing
Leaking Cooler Loose housing from thermal
shock or worn gasket
Tighten bolts on head assembly
or replace gasket if cut or worn
Leaking BPR/RV Diaphragm failure Replace diaphragm
Motor Alarm Locked PRV
Faulty motor encoder or
motor
Faulty output board inside
Sample Sentry II controller
Faulty power or signal
wiring between Sample
Sentry II controller and
motor
In most cases, you may need to
remove the PRV and manually
clean it. If Alarms continue
please contact the factory for
truobleshooting support.
PRV shaft will not
turn
Debris in PRV
PRV Position Incorrect
If possible, attempt to dislodge
debris by using your hand to
torque the PRV coupling. If this
fails, close sample isolation valve,
remove power from Sample
Sentry II, remove PRV and clean
debris from PRV. Replace PRV,
supply power to Sample Sentry
II, wait for unit to nish its startup
routine, and open sample
isolation valve.
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