WIKA CPB3800 - Handbuch (Seite 38)

38 WIKA operating instructions model CPB3800
14062232.03 12/2013 GB/D
GB
7. Maintenance, cleaning and recalibration
This covers stripping the unit to enable simple repairs and the fitting of recommended
spare parts to be carried out.
7.3 Cleaning
Cleaning the unit and checking the liquid levels.
Oil operation
Keep the system clean and free from spilt oil. Wipe out the oil cups under the gauge
stands as necessary. Do not use any cleansing solvents as they may damage the seals.
Ensure that the reservoir contains sufficient liquid to carry out any calibrations required.
If necessary top up the reservoir with the same liquid that is already being used. Do not
mix various types or brands of liquid in the pressure balance.
If the oil in the system becomes dirty, use the spindle pump to flush through the clean oil
with a drain screwed in the gauge stand. (An angle connection is suitable). The spindle
pump should be turned fully clockwise before starting.
Wear safety goggles!
Protect eyes from flying particles and liquid splashes.
For information on returning the instrument see chapter 9.1 "Return".
7.4 Recalibration
UKAS, DKD/DAkkS certificate - Certificates:
We recommend that the instrument is regularly recalibrated by the manufacturer, with
time intervals of 5 years. The basic settings will be corrected if necessary.
7.4.1 Factory overhaul and re-certification of pressure balances maintenance of
accuracy.
The accuracy of a pressure balance depends primarily on the effective area of the
piston unit and on the weights applied to the piston. The effective area of the piston unit
can be affected by wear of the unit. This is generally caused by contamination of the oil
in the pressure balance by foreign matter from instruments being calibrated, by water, or
by chemicals from instruments, or by rust or corrosion caused by contaminants.