Service manual

INSTRUMENTATION SERVICE MANUAL NUMBER 26
Page 4D-20 90-861329--1 MARCH 1999
c. As temperature rises, switch will close and ohmmeter will indicate continuity. Refer
to chart below for specifications.
48952 Switch
Opens 150-170°F (60-77°C)
Closes 190-200°F (88-93°C)
87-86080 Switch
Opens 175-195°F (79-91°C)
Closes 215-225°F (102-107°C)
72767
a
b
Switch Identification
a-48952 Switch with Red Mylar Sleeve
b-87-86080 Switch with Black Mylar Sleeve
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 temperatures.
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