Fluke Calibration 4322-SYS-NAVAIR, Руководство по обслуживанию

Страница: 101 / 186

Intensifier Maintenance
Maintenance Procedures
5
5-7
Maintenance Procedures
This section supplies maintenance information for the Intensifier.
Front-Panel and Case Cleaning
To clean the Calibrator, wipe it with a cloth that is lightly dampened with water or mild
detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or methanol based
fluids.
Pressure Generation and Leak Test
A pressure generation and leak test is a procedure to see how quickly the Intensifier can
generate and keep pressure at the target pressure. If the pressure does not build to the
target pressure within 2.5 minutes with the isolation valve closed and at least 500 psi
supply pressure, the piston seals need to be replaced.
Note
It is recommended that all four piston and two shaft seals be replaced
together.
Complete the pressure generation and leak test as follows:
1.
Close the ISOLATION valve to isolate the pressure and close the VENT valve if it is
open.
2. Connect the Intensifier to the Nitrogen Cylinder with a supply pressure of 500 psi.
3. Turn on the Intensifier.
4. Use the target boost pressure selection keys to select

.
After selected, the green
LED to the right of the key illuminates and stays illuminated until

is pushed.
5. Watch the pressure gauge and keep track of how long it takes for the pressure gauge
to reach 10,000 psi. The pressure should generate to more than 10,000 psi. Closely
observe and record only the amount of time it takes to reach or pass 10,000 psi.
Note
The normal time it takes to generate to 10,000 psi with the Isolation valve
closed is approximately 2 minutes with new seals. If it takes longer than
4 minutes, or if the pressure never reaches 10,000 psi, the piston seals or
ICM assemblies need to be replaced. For replacement instructions, see
“Pressure Port Shaft Seal, ICM, and Piston Seals” on page 5-24.
6. After pressure reaches 10,000 psi, let pressure stabilize at 10,000 psi for 2 minutes.
7. Push

to stop pressure generation and write down the pressure. Wait 60 seconds
and write down the pressure. If pressure decreases by more than 1,000 psi in
60 seconds, then there is a leak in the interconnection tubing or the check valves. If
pressure decreases by more than 2,000 psi in 60 seconds, then the Intensifier has a
leak and needs repaired or ICM replacement is necessary.

Caution
To prevent damage to the internal components in the Intensifier, do
not use until the leak is repaired.
8. Turn off the supply pressure.
9. Open the isolation valve and vent valve to vent the pressure from the Intensifier.