Maintenance - Extech Instruments 42525 User Manual

Laser Pointer Operation
This 42525 is equipped with a laser pointer that is used to aim the
IR sensor more accurately. Be extremely cautious when directing
the laser beam, shining the laser beam into someone's eye can
cause serious injury. Point the laser beam toward the device
under test whose temperature is to be measured.
Type K Thermocouple Measurement Procedure
1. Connect the Type K Thermocouple to the temperature input jack on the meter.
2. Power the meter by setting the POWER OFF/ON switch to the ON position.
3. Set the IR / TYPE K switch to the Type K position.
4. Set the temperature units (degrees C or F) using the C/F button.
5. Set the resolution to "1" using the resolution select switch (0.1 cannot be used in this
mode).
6. Place the Thermocouple in the area where the temperature is to be measured.
7. Read the LCD display for the temperature measurement.
Type K Measurement Considerations
When a Type K Thermocouple is first connected to the meter and the thermocouple and
meter temperatures are different, several minutes should be allotted so that the
temperature of the socket matches the temperature of the thermocouple. The cold junction
compensation circuitry can then operate efficiently, allowing the meter to provide
measurements with optimum accuracy.

Maintenance

Battery Replacement
When the low battery symbol appears on the LCD, replace the meter's 9V battery. The
battery compartment is located on the bottom of the meter's handle. Open the
compartment by sliding the battery compartment cover off. Replace battery and re-install
the battery compartment cover.
Model 42525 Version 2.2 October 2003
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