TB 9-6685-319-35
(2) Position controls on pneumatic pressure standard (A1) as listed in (a) through
(d) below:
(a) UNITS DISPLAYED switch to PSIA.
(b) RANGE pushbutton to 0-250.
(e) SENSITIVITY pushbutton to HIGH.
(d) SOURCE pushbutton to INT.
(3) Calculate tolerance limits for TI, using accuracy specified for applicable gage
(4) Open exhaust, metering and shutoff valves on pneumatic pressure controller
(B13).
(5) Press RESET and ZERO pushbutton on pneumatic pressure standard.
(6) Close exhaust, metering and shutoff valves on pneumatic pressure standard.
(7) Turn regulator control fully ccw.
(8) Open nitrogen tank (B12) valve and adjust regulator until outlet gage of
regulator indicates maximum pressure of TI.
(9) Open inlet valve on pneumatic pressure controller.
(10) Slowly open shut off valve on pneumatic pressure controller.
(11) Increase pneumatic pressure, using metering valve on pneumatic pressure
controller until TI reaches full scale.
(12) If TI indication does not indicate within limits calculated in (3) above, perform b
below.
(13) Close inlet valve and slowly open exhaust valve.
(14) Release pressure by opening metering valve.
NOTE
Pressure changes can be made by proper use of inlet, exhaust,
metering, and shut off valves.
(15) Repeat (2) and (6) through (14) above at cardinal points nearest to 80, 60, 40,
and 20 percent of TI scale.
b. Adjustments. Perform 8b above.
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