TB 9-6920-430-50
h. Close (CW) valve on gas supply bottle (B4). Bleed pressure down to 0 psi by opening
(CCW) INLET BLEED VALVE on GPU; then, tighten leaky fittings. Close (CW) INLET
BLEED valve. Perform steps 7e through 7g above.
a. Performance Check
(1) Connect the TI power cable to the 115 volt, 50 to 400 Hertz (Hz) power source.
Set the TI power ON/OFF control to ON.
(2) Observe that the red power indicator illuminates. If not, verify power and check
the TI fuse. Let the TI warm up for 10 minutes.
b. Adjustments.
Adjust the
zero control, (1, figure 1) under the
plastic access hole
cover until the TI digital readout indicates a 0 psi reading. (R)
9. TI Span Control Adjustment
a. Performance Check
(1) Open (CCW) INLET SHUTOFF and OUTLET SHUTOFF valves on GPU.
NOTE
System must be pressurized UP to 5,000 psi to ensure
maximum accuracy. If pressurized beyond 5,000 psi, the
system MUST be bled down to no more than 4,500 psi and
repressurized to 5,000.
(2) Press the ON button on GPU. When OUTLET PRESSURE on Precision Test
Gage indicates 5,000 psi, press OFF switch.
(3) Using leak detecting liquid (B8), squirt some drops around all output gas system
fittings.
(4) Visually inspect for gas bubbles indicating leakage.
If leaks are detected,
perform step 9a(5) below. If not, perform step 9a(6) below.
(5) Close (CW) OUTLET SHUTOFF and open (CCW) OUTLET BLEED valves on
GPU. When outlet pressure is bled to 0 psi, tighten leaky fittings. Close (CW) OUTLET
BLEED and open (CCW) OUTLET SHUTOFF valves on GPU. Perform steps 9a(2)
through 9a(4) above.
(6) The TI digital readout shall indicate 5,000 200 psi. If not, perform step 9b
below.
6