ONICON F-5100 Insertion - Manual (Page 18)

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F-5100 Insertion Thermal Mass Flow Meter Manual 05/15 - 0663-20 / 18333 Page 18
3.4 REMOVING THE FLOW SENSOR
WARNING
SYSTEM MAY BE UNDER HIGH PRESSURE. When removing the flow sensor, be sure to grasp
the electronics enclosure firmly by hand before slowly loosening the compression fitting. Failure
to do this will allow the pressure in the pipe to suddenly and rapidly force the sensor from the
pipe causing serious injury. The hand effort required to hold the sensor will be 0.2 times the pipe
pressure.
!
WARNING
Do not attempt to remove the sensor from a pipe pressurized to greater than 200 PSIG. For pipes
pressurized above 200 PSIG isolate flow and relieve pressure in the pipe before attempting to
remove the sensor.
!
Removal instructions for standard sensor installations.
1. While firmly grasping the enclosure,
loosen the compression fitting.
2. Slowly withdraw the stem until the
flats located on the sensor are exposed.
3. Close the ball valve and fully withdraw
the flow sensor.
Stop here at the
flats on the sensor
Removal instructions for sensor installed with safety cable and retaining collars.
1. Confirm that upper retaining collar is installed at the top of the flow sensor stem. If it is
not reposition the collar as shown in the drawing on the preceding page. Make certain
this collar is tightly connected to the stem.
2. Loosen the lower retaining collar.
3. While firmly grasping the enclosure, loosen the compression fitting.
4. Slowly withdraw the stem until safety cable is taut.
5. Close the ball valve, loosen the upper retaining collar and remove the flow sensor.