Recalibration; Overhaul And Recertification Of Dead-Weight Testers, Maintenance Of; Accuracy - WIKA CPB3800HP Betriebsanleitung

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7. Maintenance, cleaning and recalibration

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 use

any other type of liquid or brand.

If the oil in the dead-weight tester becomes dirty, use the spindle pump to flush clean oil

through the instrument with a drain screwed in the test connection. (An angle connection

can be used). The spindle pump should be turned fully clockwise before starting.

For information on returning the instrument see chapter 8.1 "Return".

7.4

Recalibration

DKD/DAkkS certificate - official certificates:

We recommend that the instrument is regularly recalibrated by the manufacturer, with

time intervals of approx. 5 years. The basic settings will be corrected if necessary.

The accuracy of a dead-weight tester depends primarily on the effective area of the

piston unit and on the masses applied to the piston. The effective area of the piston can

be affected by wear of the unit. This is generally caused by contamination of the oil in

the dead-weight tester by foreign matter from measuring instruments being calibrated,

by water, or by chemicals from measuring instruments, or by corrosion caused by

contaminants.

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

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

WIKA operating instructions, model CPB3800HP

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