4D-16 - INSTRUMENTATION 90-823225--1 1096
!
WARNING
The following test involves the use of intense
heat. Failure to follow appropriate procedures or
warnings can cause burns which can result in se-
vere personal injury. While performing the fol-
lowing test, observe these general precautions:
• Wear personal protective clothing such as
rubber gloves, a non-flammable apron, and
eye protection - preferably full face shield or
safety glasses.
• The appropriate heat source should only be
electric. Heat source should be operated by a
qualified person. Be sure to follow all instruc-
tions of the manufacturer of the heat source.
The heat source should be checked each time
it is used to be sure it is functioning properly.
• The thermometer used in the test should be a
high-temperature thermometer with a maxi-
mum reading of at least 300°F (150°C). Under
no circumstances should the operator allow
temperatures to exceed test specifications.
• Perform test only in a well ventilated area.
• Use a suitable container, such as metal, to
hold the sand. Avoid use of glass containers
unless the operator first confirms for himself/
herself that the glass container is an appro-
priate high-temperature vessel.
• Because the components will reach high tem-
peratures DO NOT handle materials or com-
ponents until COMPLETELY cooled.
!
WARNING
Use only clean, dry sand such as used for general
sandblasting purposes. Use of sand containing
contaminants could result in hazards such as
fire, short circuiting, hot-spots, or other hazards.
3. Follow these instructions:
a. With an ohmmeter connected as outlined and
using suitable container, thermometer and
heat source, suspend sender with tip in sand.
b. Heat sand and observe thermometer.
72772
b
c
d
a
e
a - Sutiable Container
b - Thermometer
c - Heat Source
d - Transmisson Fluid Temperature Switch
e - Ohmmeter Leads
c. As temperature rises, switch will close and
ohmmeter will indicate continuity. Refer to
chart below for specifications.
Switch Condition
Temperature
Opens 180-200° F (82-93° C)
Closes 220-240° F (104-116° C)
4. Turn heat source off. Allow sand to cool. Note
thermometer reading to ensure switch opens up
at specified temperature.
5. Replace switch if switch fails to either open or
close within the specified temperature.
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