Wika CPB3800 Instrukcja Użytkownika Pobierz pdf (Strona 40)

WIKA operating instructions model CPB3800

14062232.03 12/2013 GB/D

7. Maintenance, cleaning and recalibration

7.4.4 Overhaul and re-certication

To provide the best possible service, the pressure balance should be returned as

complete units comprising the base, the piston and cylinder unit, and all the weights.

The base can also be serviced itself. The piston-cylinder unit with weights has to be sent

back for overhaul. In such instances, certication issued after overhaul can only refer to

the piston and cylinder and weight set numbers and not to the base to which they were

originally tted.

Pressure balance bases will be stripped, all pipework cleaned, all seals replaced, worn

components replaced where desirable, and all reassembled and tested.

The weights will all be checked and brought to within original limits if possible. If one or

two weights are missing or beyond economical repair they will be replaced. If more are

missing/ beyond economical repair customer instructions will be sought.

The piston unit will be checked for accuracy and sensitivity. If it is not satisfactory for any

reason a quotation will be submitted for a replacement unit.

A new certicate of accuracy will be issued for each overhauled pressure balance.

Unless otherwise instructed on order when there has been a slight change in area of

the piston unit the certicate will reect this; the accuracy will not be aected by more

than 0.03 %. For example the certicate of accuracy of an overhauled pressure balance

might show that the error does not exceed 0.05 % when the original certicate shows

that the error did not exceed 0.02 %.

We can issue an UKAS or DKD/DAkkS certicate of calibration for an overhauled

system. Details will be supplied on request.

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Wika CPB3800 Instrukcja Użytkownika Strona 40