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5. MAINTENANCE, ADJUSTMENTS AND CALIBRATIONS
Page 121 © 2004-2007 DH Instruments, a Fluke Company
Table 25. Calibration Point Sequence, Premium Class,
Axxx and Gxxx Q-RPTs
CALIBRATION
SEGMENT
POINT
NO.
POINT
[% OF SPAN]
1 Lowest Pressure
1
2 5 %
3 10 %
4 15 %
5 20 %
6 30 %
7 40 %
8 50 %
9 60 %
10 80 %
Ascending
11 100 %
12 80 %
13 50 %
14 20 %
Descending
15 Lowest Pressure
1
1 In absolute mode, 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 should be used in gauge mode only (see Section 5.2.5).
Table 26. Calibration Point Sequence, Premium Class,
BGxxx Q-RPTs
CALIBRATION
SEGMENT
POINT
NO.
POINT
[% OF SPAN]
1
1 0 %
2 15 %
3 30 %
4 40 %
5 45 %
6 50 %
7 55 %
8 60 %
9 70 %
10 85 %
Ascending
11 100 %
12 70 %
13 50 %
14 30 %
Descending
15 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
Premium Class gauge mode (Gxxx) calibration point sequence
(see Table 25). BGxxx Q-RPTs calibrated in gauge
measurement mode only should not be used in negative
gauge mode.