5. Commissioning, operation
WIKA Operating Instruction, CPP4000-X
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EN
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5.7
Cleaning gauges
This cleaning/degreasing process is only suitable for use with pressure gauges with either phosphor
bronze, beryllium copper, Monel or stainless steel Bourdon tubes in the form of a “C”.
It is not advisable to degrease pressure gauges with steel Bourdon tubes since a very small amount
of corrosion on the bore of a Bourdon tube can cause inaccuracies of reading and early failure of the
tube.
Wear safety goggles!
Protect eyes from flying particles and liquid splashes.
This method of cleaning is not suitable for use with pressure gauges which are fitted with coiled
Bourdon tubes, nor any gauges which are to be used on oxygen, as complete removal of oil is not
assured. Please contact DH-Budenberg/WIKA.
Equipment
This consists of a syringe and a special needle with the point bent through 90°.
Instructions
1.
Fill syringe with solvent (suitable cold degreasing liquid).
2.
With gauge connection pointing upwards put needle into connection and insert by feel the point
into the hole leading to the tube.
3.
Inject the solvent. Ideally the tube should be half full.
4.
Shake gauge in various attitudes to agitate solvent.
5.
Suck solvent back into syringe, holding gauge at an angle.
6.
Check that solvent removed is clean. To be sure that all oil has been removed, repeat cleaning
process until solvent removed from gauge is as clean as that put in.
