TB 9-4940-250-35
10. Pressure Gage and Flowmeter
a. Performance Check
(1) Connect gages to calibrating manifold: G1 to A1 on manifold, G2 to A2 on
manifold, G3 to A3 on manifold and connect equipment as shown in figure 3.
(2) Connect P3, cable W3 to J3 and P4, cable W4 to J4.
(3) Set DC VOLT ADJ T2 dial to approximately 70.
(4) Set TI flowmeter switch to VOLT ADJ position.
(5) Set TI switches S1 and S2 to OFF and S3 switch to START.
(6) Connect TI to 120-V, 60-Hz power source.
(7) Set TI switch S1 to ON and S3 switch to 1. Turn flowmeter VOLT ADJ until
needle on GPM meter coincides with V. ADJ line, then set flowmeter switch to FM1.
(8) Set TI switch S3 to 2, adjust DC VOLT ADJ T2 until M2 and M3 read
approximately 0.35 A. M1 should read between 8.2 and 11.8 V.
(9) Set TI switch S3 to 3, adjust R2 dial until M2 reads 0.70 A.
(10) Set TI switch S3 to 4, adjust R3 dial until M3 reads 0.70 A.
(11) Set TI switch S3 to 1.
(12) Set TI switch S2 (pump switch) to ON.
(13) Adjust needle valve V5 until pressure gage (A6) reads 50 psi. G1, C2, and G3
will indicate between 38 and 62 psi.
NOTE
Adjust needle valves V1, V2, and V3 for steady readings of G1,
G2, and G3.
(14) Repeat technique of (13) above for indications listed in table 6.
(15) Adjust needle valve V5 until TI pressure gage G2 indicates 320 psi. Flowmeter
(part of A5) will indicate 1.7 gpm 3 percent when TI reads in green area.
(16) Set switches S1 and S2 to OFF.
b. Adjustments. No adjustments can be made.
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