TB 9-4920-367-24
Figure 1. Vacuum and pressure check - equipment setup.
e. Lightly tap TI and compare TI ambient atmospheric pressure indication to
indication on pneumatic pressure standard. If TI indication does not agree with pneumatic
pressure standard within r0.25 inHg, adjust the calibration adjustment (located beneath
the glass face of TI) to agree with pneumatic pressure standard indication.
f. Open nitrogen bottle valve. Adjust manifold bracket regulator to apply 22 psi to
digital pressure controller +300 Supply.
g. Energize vacuum pump.
WARNING
To prevent injury to personnel or damage to equipment, make
certain that all components are within the range of the unit to
be calibrated and all connections are securely sealed prior to
applying pressure to TI. Never attempt to tighten connections
with pressure applied.
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