Onicon F-5100 Insertion Manual do Utilizador descarregar pdf (Página 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 ow sensor, be sure to grasp

the electronics enclosure rmly by hand before slowly loosening the compression tting. 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 ow and relieve pressure in the pipe before attempting to

remove the sensor.

Removal instructions for standard sensor installations.

1. While rmly grasping the enclosure,

loosen the compression tting.

2. Slowly withdraw the stem until the

ats located on the sensor are exposed.

3. Close the ball valve and fully withdraw

the ow sensor.

Stop here at the

flats on the sensor

Removal instructions for sensor installed with safety cable and retaining collars.

1. Conrm that upper retaining collar is installed at the top of the ow 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 rmly grasping the enclosure, loosen the compression tting.

4. Slowly withdraw the stem until safety cable is taut.

5. Close the ball valve, loosen the upper retaining collar and remove the ow sensor.

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Onicon F-5100 Insertion Manual do Utilizador Página 18