Onicon F-5100 Insertion Instrukcja Użytkownika Pobierz pdf (Strona 31)

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F-5100 Insertion Thermal Mass Flow Meter Manual 05/15 - 0663-20 / 18333 Page A-4

Method 3 (Ambient Pressure Air Calibration Test)

1. While rmly grasping the enclosure, loosen the compression

tting at the top of the ball valve.

2. Slowly withdraw the stem until the ats located on the sensor

are exposed.

3. Carefully close the ball valve and fully withdraw the ow

sensor.

4. Place the ow sensor in to an empty water bottle.

5. Wait up to 2 – 3 minutes to allow the sensor reading to stabilize at zero and note

the mW reading on the display.

6. Compare the reading to the zero ow air calibration shown on the laminated tag

attached to the sensor. The two readings should agree within ± 5mW.

7. At the conclusion of the test, re-install the sensor as per the instruction manual.

IMPORTANT NOTE

The ambient pressure air calibration test can be used to validate the sensor calibration independent

of the process uid. As such, this test can be a useful diagnostic tool.

Method 2 (Used when it is not possible to stop ow in the pipe.)

1. While rmly grasping the enclosure, loosen the

compression tting at the top of the ball valve.

2. Slowly withdraw the stem until the bottom of the ats

located on the sensor is just exposed.

3. Re-tighten the compression tting to ½ turn beyond

hand tight.

4. Carefully close the ball valve.

5. Wait up to 2 – 3 minutes to allow the sensor reading to

stabilize at zero and note the mW reading on the display.

6. Compare the reading to that stamped on the nameplate.

The two readings should agree within ± 5mW.

7. At the conclusion of the test, re-install the sensor as per

the instruction manual.

Interpreting Test Results

Zero ow calibration test readings that are within ± 5mW of the original calibration value indicate

that the sensor calibration is still valid.

Zero ow calibration test readings that are within ± 10mW of the original calibration value indicate

that the sensor calibration is still valid, but the test results were likely inuenced by external factors.

These include any or all of the following:

1. Sensor orientation (installed horizontally).

2. Dirt or debris is coating all or part of the sensor assembly.

3. Process uid composition different from the uid used during calibration.

(Use ambient air calibration test to conrm.)

4. Residual ow readings during test due to leaking valves or sensor movement.

(Repeat test using alternate method.)

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