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Qi is the actual measured mass flow rate passing through a meter under a specific set of test
or operating conditions
Qmin is the minimum allowable mass flow rate through the meter, as specified by the meter
manufacturer
Qmax is the maximum allowable mass flow rate through the meter, as specified by the meter
manufacturer

1.12.4 Field Meter Validation
The following general meter verification procedures shall be performed on quarterly basis
during the meter validation exercise:
1.12.5 Meter Transmitter Verification
The meter transmitter verification should coincide with the meter zero check. It should
include the following procedures:
• Verify the sensor calibration and correction factors in the configuration of the
transmitter to be unchanged from most recent calibration.
• Verify all transmitter diagnostic indicators to be in the normal state.

1.12.4.2 Coriolis Sensor Verification
Sensor diagnostics may be available that continuously, on-command or procedurally verify
the performance of the sensor and/or infer change in measurement performance. Meter
manufacturer should be consulted for the availability of these types of diagnostics.
1.12.4.3 Temperature Verification
Spot checks shall be conducted by placing a temperature probe through the thermowell to
verify the reading of the Coriolis temperature transmitter which monitors the temperature
element bonded to the flow tubes of the Coriolis sensor.
1.12.4.4 Density verification
The density verification shall be carried out by passing a gas of known density and
components (calibration gas) through the densitometer and/or Gas chromatograph.
The Densitometer shall be the primary means of density measurements at custody transfer
points.
1.12.4.5 Meter Zero Verification
A change in the meter zero value can be used as an indicator of change in the metering
conditions.
The meter zero should be checked at flowing pressure and temperature within 1 to 4 weeks
of installation and quarterly during its field service years. The meter zero verification should
include the following procedures:
i. Ensure thermal stability
ii. Record the as-found zero
iii. Verify the indicated meter zero value to be within manufacturer specification limits
• If meter zero is within specification,
• record the as-left meter zero value, and
• return the meter to service.