WIKA CPH6600 - Handbuch (Seite 43)

43 WIKA operating instructions, model CPH6600
14005103.03 11/2012 GB/D
GB
7. Maintenance, cleaning, and recalibration
7.2 Cleaning
CAUTION!
■ Before cleaning, vent and switch off the hand-held pressure
calibrator.
■ In order not to damage the display or case, do not use any solvent or
scouring agents for cleaning.
■ Clean the instrument with a moist cloth.
■ Electrical connections must not come into contact with moisture.
Cleaning the valves
Occasionally, the CPH6600 might not work properly due to dirt or other contamination
in the internal valve assembly. Use the following procedure for cleaning the valve
assembly. If this procedure does not fix the problem, the instrument should be sent back
for repair.
1. Use a small screwdriver to remove the two valve protection caps in the battery
compartment (see chapter 4.4 "CPH6600 hand-held pressure calibrator, pressure
and electrical connections").
2. After the caps have been removed, gently remove the spring and the O-ring
3. Place the valve components in a safe area and clean out the valve body using a
cotton swab (standard accessory) soaked in isopropyl alcohol.
4. Repeat the process several times, using a new cotton swab each time, until there is
no remaining evidence of contamination.
5. Operate the pump several times and recheck the valve body for contamination.
6. Clean the O-ring assembly and the O-ring on the retention caps with isopropyl
alcohol and check the O-rings closely for any damage or excessive wear. If
necessary, replace the O-rings.
7. Inspect the springs for wear or loss of tension. They should be approximately 8.6 mm
long in the relaxed state. If they are shorter, they may not be able to provide sufficient
sealing force. If required, replace them.
8. Once all components have been cleaned and checked, reinstall the O-ring and
spring assembly into the valve body.
9. Place the retaining caps back in position and carefully tighten them.
10. Close the output port and operate the pump to at least 50 % of its capacity.
11. Release the pressure and repeat several times to ensure that the O-ring is seated
correctly.
For information on returning the instrument see chapter 9.2 "Return".