TB 9-4931-228-24
WARNING
Always use digital pressure controller 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.
(1) Configure digital pressure controller as indicated in (a) through (d) below:
(a) Select psi units.
(b) Select Gage mode and 300 psig range.
(c) Press set-up button. Select User menu and zero the 300 psig range.
(d) Press task button. Select Basic to return to Task:Basic menu.
(2) Open nitrogen tank valve and adjust manifold bracket regulator until output
gage indicates 70 psi.
(3) Operate digital pressure controller to exercise TI three times over range of 0
to 60 psi.
(4) Operate digital pressure controller for TI indications listed in table 4. Digital
pressure controller will indicate within limits specified.
Pneumatic pressure standard
indications (psi)
Test instrument
Marsh, type 3
Indications
Min
Max
10
8.8
11.2
20
18.8
21.2
30
28.8
31.2
40
38.8
41.2
50
48.8
51.2
60
58.8
61.2
(5) Adjust digital pressure controller for zero indication on TI.
(6) Close nitrogen tank valve and bleed pressure from lines using manifold bracket
vent valve.
(7) Perform vent operation on digital pressure controller.
b. Adjustment. No adjustments can be made.
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.