ADM-870 05/23/0846
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 accurate equal base pressure of approximately 3 psi before adding 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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