TB 9-4920-367-35
8. Vacuum
a. Performance Check
(1) Operate pneumatic pressure controller (B4) for indication of 5 in. Hg on TI.
Pneumatic pressure standard (A1) will indicate between 4.75 and 5.25 in. Hg.
(2) Repeat technique of (1) above for TI indications listed in table 4. Pneumatic
pressure standard will indicate within limits specified.
b. Adjustments. No adjustments can be made.
Table 4. Vacuum Check
Test Instrument
Pneumatic Pressure Standard Indications
Indications
(In. Hg)
(In. Hg)
Min
Max
10
9.75
10.25
15
14.75
15.25
20
19.75
20.25
25
24.75
25.25
29.9
29.65
30.15
9. Pressure
a. Performance Check
(1) Connect TI to 0-250 PSIA inlet port of pneumatic pressure standard (A1).
(2) Set pneumatic pressure standard UNITS DISPLAYED switch to PSIA and press
RESET pushbutton.
(3) Operate pneumatic pressure controller (B4) for zero psi indication on TI.
(4) Press ZERO pushbutton on pneumatic pressure standard.
(5) Operate pneumatic pressure controller for indication of 5 psi on TI. Pneumatic
pressure standard will indicate between 4.75 and 5.25 psi.
(6) Repeat technique of (5) above for TI indication listed in table 5. Pneumatic
pressure standard will indicate within the limits specified.
Table 5. Pressure Check
Test Instrument
Pneumatic Pressure Standard Indications
Indications
(Psi)
(Psi)
Min
Max
10
9.75
10.25
15
14.75
15.25
20
19.75
20.25
6
