ADM-870C 07/14/0956
APPENDIX B - LABORATORY DIFFERENTIAL PRESSURE TEST
Some applications such as nuclear power plants, health care facilities and clean rooms require more frequent instrument
calibration testing and accuracy verification. Calibration services and documentation is available at Shortridge Instruments,
Inc. However, if interim calibration tests are required at your own metrology department or at an independent laboratory, the
following information will be helpful.
The reference pressure source may be very accurately controlled by using two deadweight test units that are set up with
different pressures of precisely the desired test differential pressure. These testers must be carefully adjusted to an equal
base pressure of approximately 3 psi before adding the weight to one unit to generate the required differential pressure.
The AirData Multimeter should be tested at a minimum of three pressures:
0.1250 in wc
. (31 Pa)
2.000 in wc
. (500 Pa)
30.000 in wc
. (7500 Pa)
If more test points are required, the following schedule is recommended:
0.0500 in wc
. (12 Pa)
0.1250 in wc
. (31 Pa)
0.2250 in wc
. (56 Pa)
0.2700 in wc
. (67 Pa)
2.000 in wc
. (500 Pa)
3.600 in wc
. (900 Pa)
4.400 in wc
. (1100 Pa)
27.00 in wc
. (6750 Pa)
50.00 in wc
. (12,500 Pa)
Refer to Section 14.2 DIFFERENTIAL PRESSURE FUNCTION under Section 14.0 METER ACCURACY FIELD TESTING
of this manual for additional information.
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