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RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 4
Warm Up Time
30 minute temperature stabilization recommended from
cold power up.
Resolution
To 1 ppm, user adjustable
Compensated Temperature Range
5 to 35 °C
Acceleration Affect
± 0.008 % /g maximum, worst axis
Allows operation at ± 20° from reference plane without
significant effect
Predicted One Year Stability
(all classes and types)
1
± 0.005% of reading
Q-RPTs UP TO A10M (1500 psi)
STANDARD CLASS PREMIUM CLASS
Precision
2
± 0.008% of reading or
0.0024% of Q-RPT span,
whichever is greater
4
± 0.005% of reading, 0.0015%
of AutoRanged span, or
0.0005% of Q-RPT span,
whichever is greater
5
Measurement Uncertainty
3
± 0.01% of reading or 0.0030%
of Q-RPT span, whichever is
greater
4
± 0.008 % of reading, 0.0024%
of AutoRanged span, or
0.0007% of Q-RPT span,
whichever is greater
5
Q-RPTs A14M TO A140M (2 000 to 20 000 psi)
Precision
2
± 0.012% of reading or 0.0036% of Q-RPT span, whichever is
greater
4
Measurement Uncertainty
3
± 0.013% of reading or 0.0039% of Q-RPT span, whichever is
greater
4
Q-RPTs A200M TO A280M (30 000 to 40 000 psi)
Precision
2
± 0.015% of reading or 0.0045% of Q-RPT span, whichever is
greater
4
Measurement Uncertainty
3
± 0.018% of reading or 0.0054% of Q-RPT span, whichever is
greater
4
1. Predicted Q-RPT measurement stability limit (k=2) over one year assuming regular use of AutoZero function. AutoZero
occurs automatically in gauge mode whenever vented, by comparison with barometric reference in absolute mode.
Absolute mode predicted one year stability without AutoZ is ± (0.005 % Q-RPT span + 0.005 % of reading).
2. Combined linearity, hysteresis, repeatability. Add + 1 Pa (0.00015 psi) in gauge mode with an Axxx (absolute) Q-RPT for
the resolution and short term stability of the on-board barometer.
3. Maximum deviation of the Q-RPT indication from the true value of applied pressure including precision, predicted one year
stability limit, temperature effect and calibration uncertainty, combined and expanded (k=2) following the ISO “Guide to the
Expression of Uncertainty in Measurement.”
4. % of reading value times measured pressure from 100 to 30 % of Q-RPT span. Under 30 % of Q-RPT span, % of reading
value times 30 % of Q-RPT span. For example, if the Q-RPT is a Standard A160K, the Measurement Uncertainty in
pressure is 0.010% times the measured pressure to 48 kPa (160 kPa span x 30%) and 0.0048 kPa (160 kPa span x 30%
x 0.01%) under 48 kPa.
5. % of reading value times measured pressure from 100 to 30 % of AutoRanged span. Under 30% of AutoRanged span, % of
reading value times 30% of AutoRanged span. If AutoRanged span is less then 30% of maximum Q-RPT span, % of reading
values times measured pressure, or % of reading times 9% of Q-RPT span, whichever is greater. For example, if the Q-RPT is a
Premium A160K and AutoRanged span is 160 kPa, the Measurement Uncertainty in pressure is measured pressure x 0.008% to
48 kPa (160 kPa AutoRanged span x 30%) and 0.0038 kPa (160 kPa span x 30% x 0.008%) under 48 kPa. If the AutoRanged
span is 100 kPa (greater than 30% of 160 kPa maximum Q-RPT span), the Measurement Uncertainty in pressure is measured
pressure x 0.008% to 30 kPa (100 kPa AutoRanged span x 30%) and 0.0025 kPa (100 kPa span x 30% x 0.008%) under 30 kPa.
If the AutoRanged span is 30 kPa (less than 30% of the 160 kPa maximum Q-RPT span), the Measurement Uncertainty in
pressure is measured pressure x 0.008% to 14.4 kPa (160 kPa maximum Q-RPT span x 9%) and 0.0012 kPa (160 kPa maximum
Q-RPT span x 9% x 0.008%) under 14.4 kPa.
1.2.2.2 ON-BOARD BAROMETER
The on-board barometer is used only to measure changes in atmospheric pressure
to provide dynamic compensation of the Q-RPT’s atmospheric pressure offset when
using an Axxx (absolute) Q-RPT to make gauge pressure measurements and for
line pressure compensation of G15K and BG15K Q-RPTs.
There is no on-board barometer in RPM4s that have Gxxx (gauge)
Q-RPTs only.