PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 188
Table 28.
Calibration Point Sequence, Standard Class, BGxxx Q-RPTs
CALIBRATION
SEGMENT
POINT
NO.
POINT
[% OF SPAN]
1
Ascending
1
0 %
2
25 %
3
50 %
4
75 %
5
100 %
Descending
6
75 %
7
50 %
8
25 %
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.
Note
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 27). BGxxx
Q-RPTs calibrated in gauge measurement mode only should not
be used in negative gauge mode.
Table 29.
Calibration Point Sequence, Standard Class, BA100K Q-RPT
CALIBRATION
SEGMENT
POINT
NO.
POINT
[% OF SPAN]
1
Ascending
1
0 %
2
25 %
3
50 %
4
75 %
5
100 %
Descending
6
75 %
7
50 %
8
25 %
9
0 %
1. The BA100K span is 70 to 110 kPa absolute.
7.2.4.2 Premium Class Q-RPTs
See additional information in Section 7.2.4 concerning exercising the Q-RPT and
dwell time at pressure points.
Verification of Premium Class Q-RPTs
When verifying (as opposed to calibrating) a Premium Q-RPT it is not necessary to
include the higher density of points that is recommended for determination of the
calibration coefficients. A standard ascending/descending 9 or 11 point run is
adequate. To verify that the uncertainty turndown with AutoRange is in tolerance (see
Sections 3.2.6, 1.2.2.1), it is recommended that the verification of a Premium Q-RPT
include a verification of an AutoRanged span of 30 % of the maximum Q-RPT span.
For example, verify an A7M Q-RPT in the default range of 0 to 7 MPa (1 000 psi) and
in the AutoRange range of 2.1 MPa (300 psi).
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