TB 9-6685-319-35
15. 235 to 1000 Psi Pneumatic Gages (0.1 to 1.0 Percent Accuracy)
WARNING
To prevent injury to personnel or damage to equipment, make
certain that all components used are clean and have not been
contaminated with oil or grease.
a. Performance Check
(1) Connect equipment as shown in figure 3, connection B.
(2) Calculate tolerance limits for TI, using accuracy specified for applicable gage.
(3) Open exhaust, metering and shutoff valves on pneumatic pressure controller
(B13).
(4) Close reservoir valve on deadweight tester, and inlet valves on pneumatic
pressure controller.
(5) Loosen fill and vent plug on pressure gage tester.
(6) Operate hand pump until weight table rises (tare weight).
(7) Open reservoir valve, allowing weight table to fall to bottom stop; then wait
about 10 seconds before closing reservoir valve.
(8) Close shutoff, metering, and exhaust valves on pneumatic pressure controller.
WARNING
To avoid scoring the piston guide and damage to the
deadweight cylinder, constantly rotate weights and piston
when inserting or removing piston or when applying pressure.
(9) Place enough deadweights (supplied with pressure gage tester (A2)) on
applicable low or high pressure piston to obtain a pressure equal to cardinal point nearest
to 10 percent of TI scale.
(10) Turn regulator (Bl4) fully ccw.
(11) Open nitrogen tank (B12) valve and adjust regulator until outlet gage of
regulator indicates maximum pressure of TI.
(12) Ensure that metering and exhaust valves on pneumatic pressure controller are
closed.
(13) Open inlet valve on pneumatic pressure controller.
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