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TM 55-6695-220-13&P
The tester's capabilities in terms of temperature range and types of thermocouples that can be handled are summarized
in Table 2-1.
Table 2-1. Temperature Ranges For Temperature Selector Switch
Copper-Constantan Thermocouple Sensor
-50º to +350ºC
Iron-Constantan Thermocouple Sensor
-70° to +350ºC
Chromel-Alumel Thermocouple Sensor
0° to 1200ºC
b.
Prior to checking the indicator for temperature errors over its range of operation, the indicator's reading is made
to agree with the tester's reference output by manipulating the zero-adjust on the test unit. At these reference
temperatures, one for each colored section, (See Table 2-2) the tester's reference output is precisely zero millivolts.
Table 2-2. Thermocouple Material And Corresponding Reference Settings For Temperature Selector Switch
THERMOCOUPLE MATERIAL
TEMPERATURE SELECTOR SWITCH
SECTOR
POSITION
Copper-Constantan
Red
20°C Ref.
Iron-Constantan
Yellow
20°C Ref.
Chromel-Alumel
Green
0°C Ref.*
* NOTE
The indicator for a chromel-alumel thermocouple is adjusted with the zero-adjust at a mid
range point 700°C for 0° to 1000ºC thermocouple and 900ºC for a 0° to 1200ºC
thermocouple to produce a 0° error. The proper procedure should be obtained from the
indicator manual.
2-2
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