Fluke RPM4 manual Equipment Required, GAS Operated Q-RPTS, A10M and Lower

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATIONS

readings with PA = 0 and PM = 1. Then applying the as received PA and PM and Poffset values to the readings calculates as received readings (the readings that the transducer would have made with the old PA, PM and Poffset).

It is recommended that “as received” values of PA, PM and Poffset (for Axxx Q-RPTs if absolute mode AutoZero is used in normal operation) be recorded for

each Q-RPT prior to running the calibration. The current PA, PM and Poffset (for Axxx Q-RPTs) can be viewed by pressing [SPECIAL], <8cal>, <1view>.

5.2.2 EQUIPMENT REQUIRED

The recommended calibration standards for RPM4 Q-RPTs are DHI PG7000 piston gauges (PG7102, PG7202, PG7601 for gas; PG7302 for oil). Contact DHI for additional information.

5.2.2.1GAS OPERATED Q-RPTS, A10M AND LOWER

Gas operated piston gauge (deadweight tester), with the following characteristics:

•Measurement uncertainty of ± 0.0025 % of reading for Standard Class Q-RPTs or ± 0.002 % of reading for Premium Class Q-RPTs. A standard with higher measurement uncertainty may be used but RPM4 measurement uncertainty may be degraded proportionally from published specifications.

•If the Q-RPT is Axxx (absolute) and will be used in the absolute and/or negative gauge measurement modes, the reference must be able to apply absolute pressures: Absolute pressures may be defined either by operation relative to an evacuated bell jar or, for higher pressures, by addition of atmospheric pressure measured by a suitable barometer. Axxx (absolute)

Q-RPTs that will not be used in absolute or negative gauge measurement modes (as is often the case for higher pressure Q-RPTs) do not require the application of absolute pressure for calibration and may be calibrated using a gauge pressure standard.

Axxx (absolute) Q-RPTs calibrated in gauge measurement mode by applying gauge reference pressure values should be used in gauge mode only (see Sections 3.3.3,  PRINCIPLE, 5.2.5).

•Able to supply the recommended sequence of pressure points in the range to be calibrated: See Section 5.2.4 for information on the recommended calibration point sequence for various Q-RPT types and classes.

5.2.2.2OIL OR GAS OPERATED Q-RPTS A14M AND HIGHER

Gas or oil operated piston gauge (deadweight tester), with the following characteristics:

Do not put oil or other liquids in a Q-RPT that is meant to be operated with gas.

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