Operation Manual

Job Card No.:
Engine:
Filing No.:
Temperature Switch (OIl, Water, Air)
Testing / Reconditioning
0178-48-10 1189
Testing
Check the switch for correct setting and proper
functioning.
The switch comprises sensor (1) with pocket (2) - test
site - and a setting unit (4) - cable terminal box -.
Be sure lead (7) between setting unit (4) and
sensor (1) will not chafe.
Job
Clean sensor (1) externally and check that it is firmly
seated.
Setting:
Refer to the section 3.3 ”Technical Specifications”
for the set point values of the temperature switch trip
points. The trip point (see 3.3) is set on dial (3) of unit
(4) with an accuracy of 2.5 % over the entire tempe-
rature range.
a) Testing the Sensor (1)
Remove sensor (1) from pocket (2) and dip in hot
water. Use and ohmmeter to meet the electrical
resistance. By means of curves on sheet (3),
compare actual and specified values, or test as
under c).
b) Testing the Setting Unit (4)
Remove unit (4) from terminal box and connect to
terminals (3) and (4) of sensor (1) in water by
means of two 1.5 mm2 leads. Apply auxiliary
voltage of 24 volts to terminals (1) and (2). Con-
nect ohmmeter to terminals (5) and (6). Adjust dial
(3) to determine trip point and compare with wa-
ter temperature. If test result is satisfactory, seal
unit with lead, or test as under c).
c) Testing Sensor (1) plus Setting Unit (4) as a
Whole (alternatively)
Use test instrument TP 100/12 supplied by Noris
Techometerwerk GmbH & Co., Muggenhofer Str.
95, 8500 Nürnberg, Germany.
11.01.01 Page 1 of 3
S/BVM 628
Tools:
- Standard tools
- Ohmmeter
- Thermometer
- Heat conducting compound
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