Operation Manual

Job Card No.:
Engine:
Filing No.:
Pressure Switch
for Oil, Water and Air
0178-48-0010 1919
© 0185
11.01.02 Page 1 of 2
S/BVM 628
Inspection / Testing
Inspect and test the switch for proper functioning.
Pressure switches are available for the follo-
wing media: lube oil, fuel, raw water, fresh
water, injector coolant, control (pilot) air, star-
ting and charge-air pressure. Settings are indi-
cated on the switch in bar (kp/cm2). Check
whether settings is to fix minimum (dropping)
or maximum (rising) limits. (Terminal 212/212
always for rising function). Test for proper
functioning has to be carried out with the unit
operating.
Clean housing (1) externally. Check that all bolts/
screws and stuffing box screwing (2) are tight. Be
sure no lead can chafe. Close shut-off valve (3).
Functional Test
For testing functions of the instruments mounted on
the pressure switch panel, remove screw plug (4)
and connect in place of same the hose with test
connection. To this hose can be connected a test
gauge or a test pump combined with test gauge.
Subject switch to a higher working pressure by a
commercial test pump. check that switch trips as the
pressure falls or rises (depending on setting and
application). The test gauge indicates the prevailing
working pressure.
Compare actual tripping point (e.g. for release of an
alarm) to the preset tripping point (see Section 3.3).
Tools:
- Standard tools,
- testing gauge,
- hose with test connection
- Commercial test pump
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