Vacuum

TB 9-4910-556-35

Figure 6. Pressure and vacuum (25 psi) - equipment setup.

(10) Set TEST SELECT switches to 49.

(11) Apply 25 psi and reduce to 0 three times.

(12) Repeat (4) through (6) above. Offset value will be between -4 and +4.

(13) Apply 5 psi. VTM will indicate between 4.8 and 5.2 psi.

(14) Apply 25 psi. VTM will indicate between 24 and 26 psi.

b. Adjustments. No adjustments can be made.

14. Vacuum

a. Performance Check

(1) Connect equipment as shown in CONNECTION B (fig. 6), using pressure

transducer TK22 -30 to +25 psig.

(2) Set TEST SELECT switches to 45.

(3) Operate vacuum pump and adjust pressure controller and pneumatic pressure

standard controls for 18 inHg indication and back to atmospheric pressure three times.