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May 2023
WARNING
Before removing the sensor, be absolutely certain that the
process pressure is reduced to 0 psig (0 barg) and the process
temperature is lowered to a safe level.
Do not insert or retract retractable sensors when process
pressure is above the specified retraction pressure limit for the
length of sensor being used.
For 21-in. (533 mm) length sensors the maximum allowed
retraction pressure is 64 psig (5.4 barg).
For 36-in. (914 mm) length sensors the maximum allowed
retraction pressure is 35 psig (3.4 barg).
Provide adequate working area for retraction.
Procedure
1. Unscrew the retainer from the packing adapter.
If it is difficult to unscrew the retainer, system pressure may
be forcing the clamp stop ring into the retainer. The packing
bushing may not be tight enough to hold the sensor in place.
To prevent a sudden retraction of the sensor as the retainer is
removed, hold onto the back of the sensor to restrain it.
2. If the sensor does not slide back as the retainer is unscrewed,
pull from the back of the sensor to release it.
3. If you cannot retract the sensor, loosen the clamp stop ring
using the hex key. Pull the stop ring back and slowly loosen
the packing bushing in ⅛ turn increments.
System pressure may cause the sensor to retract. If the sensor
still does not retract, pull on the back of the sensor to retract
it.
4. Withdraw the sensor until the sensor guard contacts the stop
inside the packing adapter.
NOTICE
Failure to withdraw the sensor completely may result in
damage to the sensor when the valve is closed.
5. Unscrew the packing adapter from the ball valve to remove
the sensor.
Quick Start Guide
Quick Start Guide
17
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