5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 125 © 2002-2007 DH Instruments, a Fluke Company
It is not required that the calibration pressure standard apply precisely the nominal pressure
value of each calibration point as long as the exact value of the applied pressure is known.
Best results are obtained if the actual applied pressure is within 2 % of the nominal point definition.
5.2.4.1 STANDARD CLASS Q-RPTS
See additional information in Section 5.2.4 concerning exercising the Q-RPT and
dwell time at pressure points.
Table 22. Calibration Point Sequence, Standard Class, Axxx and Gxxx Q-RPTs
CALIBRATION
SEGMENT
POINT
NO.
POINT
[% OF SPAN]
1 Lowest Pressure
1
2 25 %
3 50 %
4 75 %
Ascending
5 100 %
6 75 %
7 50 %
8 25 %
Descending
9 Lowest Pressure
1
1 In absolute mode, the lowest point that can be set reliably by
the \reference piston gauge. Zero (vented) in gauge mode.
Axxx (absolute) Q-RPTs that will NOT be used in absolute or negative gauge
measurement modes may be calibrated in gauge measurement mode with 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
Section 5.2.5).
Table 23. Calibration Point Sequence, Standard Class, BGxxx Q-RPTs
CALIBRATION
SEGMENT
POINT
NO.
POINT
[% OF SPAN]
1
1 0 %
2 25 %
3 50 %
4 75 %
Ascending
5 100 %
6 75 %
7 50 %
8 25 %
Descending
9 0 %
1. The BG15K span is – 15 to + 15 kPa, 30 kPa total. Therefore,
0 % is – 15 kPa, 25 % is – 7.5 kPa, 100 % is + 15 kPa, etc.
BGxxx (bi-directional gauge) Q-RPTs that will NOT be used in negative gauge
measurement mode may be calibrated in gauge (positive pressures) measurement mode
only. Use the gauge mode (Gxxx) calibration point sequence (see Table 22). BGxxx Q-
RPTs calibrated in gauge measurement mode only should not be used in negative gauge
mode.
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