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11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax +1 (727) 442-5699 • [email protected]
F-5500 Thermal Mass Flow Meter Manual 06/17 - 2030 / 107023
Page 58
Model F-5500
OPERA
TION
Operation: Zero CAL-CHECK
®
Calibration of the ONICON Model F-5500 Thermal Flow Meter
To ensure that all ONICON flow meters meet specified performance parameters and
provide accurate, repeatable measurements in the field, all calibrations are performed
with NIST-traceable flow standards. Each meter is shipped from the factory with a
ONICON Calibration Certificate.
Calibration Validation
Calibration Validation allows our customers to validate the accuracy and functionality
of the meter in the field with a push of a button. By performing a simple test, the
operator can verify that the meter is running accurately.
Zero CAL-CHECK
®
ensures the repeatability, functionality of the sensor and its
associated signal processing circuitry, and cleanliness of the sensor.
ONICON has developed the Zero CAL-CHECK
®
Calibration Validation to help our
customers avoid sending the meter back for annual or biennial re-calibrations.
Zero CAL-CHECK
®
Calibration Validation Test
The Zero CAL-CHECK
®
test is used to ensure that the flow meter still retains its original
NIST-traceable calibration at zero flow. If zero flow can be established, the sensor
does not need to be removed and the procedure can be done in the pipe. Alternatively,
a clean, dry bottle can be used to create a “no flow” condition out of the pipe.
NOTE: If the Zero CAL-CHECK
®
test is performed using the ONICON F-5000 View
Software, at the completion of the test, a Zero CAL-CHECK
®
Certificate may be printed
for a record of the test. This certificate will display a pass/fail result.
Techniques for Achieving Zero Flow - In the Pipe
In-situ (in the pipe) Zero CAL-CHECK
®
testing can be achieved by a pipe bypass
(valving-off). If space allows, redirect the flow through a bypass pipe section or valve
off the meter in order to isolate the meter's sensor in the place where it has been
installed. While the flow is redirected, the Zero CAL-CHECK
®
test can be performed.
Once the test is complete, the valves to the bypass may be closed and flow may be
directed back to the meter's sensor where flow monitoring can continue as normal.
Calibration
Calibration
Validation
Zero CAL-
CHECK
®
Achieving
Zero Flow -
In-Situ (In the
Pipe)
Zero CAL-CHECK
Test
