TB 9-4920-367-24
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
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. Close all valves, and vent all pressure
lines before disconnecting equipment.
WARNING
Always use pneumatic pressure standard control mode to
reduce system pressure. Using the vent function to reduce
pressure may damage rate-sensitive equipment. Only use vent
function when system pressure is close to local atmospheric
pressure. Local atmospheric pressure may vary, but the value
should be 0 psi gage; approximately 29.7 inHg or 14.7 psi
absolute.
NOTE
Zero pneumatic
pressure standard
before
performing
measurements.
a. Energize pneumatic pressure standard and allow 30 minutes for warm-up.
b. Remove brass fitting with nipple from flexible hose of TI.
c. Connect equipment as shown in figure 1 below.
d. Configure pneumatic pressure standard as indicated in (1) through (5) below.
(1) Units to inHg absolute.
(2) Select Absolute mode.
(3) Select 315 psia range.
(4) Press Control button. Enter set point of 28.0 inHg, and rate of 0.5 inHg/s.
(5) Press Set-up button. Select User menu and zero the 315 psia range.