Wika CPB3800 Instrukcja Użytkownika Pobierz pdf (Strona 39)

WIKA operating instructions model CPB3800

14062232.03 12/2013 GB/D

7. Maintenance, cleaning and recalibration

Weights are made of austenitic stainless steel which are entirely stable. They should be

periodically cleaned using a non abrasive method to remove any foreign matter.

7.4.2 Need for overhaul and re-certication

We recommend that the pressure balance be returned to us for overhaul and

re-certication at any time if when used in accordance with instructions:

1. The piston does not spin freely.

2. The rate of fall of the piston is appreciably greater than when new and makes use of

the pressure balance dicult.

3. The weights are damaged.

4. The pressure balance cannot be made to operate satisfactorily due to wear or

damage to pump piping or valves which cannot be rectied by the user.

This pressure balance can be used for calibration of instruments with an expected

accuracy of 1, 0.5 or 0.25 %. Such pressure balances need not be sent back frequently

for overhaul and re-certication and provided they are working well can be trusted for

many years. Under these circumstances, an interval of ve years might be appropriate

between overhauls.

When high accuracy of the pressure balances is required, it should be returned for

overhaul and re-certication more frequently. The actual period will depend on how the

pressure balance is used. A pressure balance kept in a laboratory and carefully used

might need to be returned every two to ve years. A pressure balance carried from site

to site and used for calibrating high accuracy gauges or transducers from industrial

process plant or for measuring pressures directly might well need to be returned at

intervals of less than specied above.

The actual period between overhaul and re-certication should be xed by the user in

the light of the above comments taking into account the requirements of any inspection

authority, which might be involved.

7.4.3 Identication of weights

All weight sets supplied with a pressure balance have allocated, and are marked, with

a weight set number. Additionally, if users wish to ensure that only specic weights are

used with an individual pressure balance or piston and cylinder unit, then the serial

number of the pressure balance, and/or piston-cylinder unit may also be marked on the

main weights. Regrettably due to size of certain weights, not all the above information

may be marked.

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Wika CPB3800 Instrukcja Użytkownika Strona 39