C F How To Measure Temperature On A Coolant Temperature Sensor - Fluke 78 User Manual

78
Users Manual
C F How to Measure Temperature on a Coolant
Temperature Sensor
The Fluke 80BK Thermocouple Adapter that comes with
the meter is suitable for making temperature measure-
ments from -40 C (or F) to 260 C (500 F) in teflon-
compatible environments.
Warning
Above this temperature, toxic gas might be
emitted. Do not immerse this thermocouple in
liquids .
For best results, use the thermocouple probe designed for
each application (i.e., an immersion probe for liquid or gel,
an air probe for air measurements, etc), and follow the
measuring techniques below:
Clean the measurement surface and make sure the
probe is attached securely to the surface.
When measuring above-ambient temperatures, move
the thermocouple on the surface until you get the
highest temperature reading.
When measuring below-ambient temperatures, move
the thermocouple on the surface until you get the
lowest temperature reading.
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When measuring near-ambient temperatures, take
the reading when the display is most stable.
Excessive voltage and strong, low-frequency and radio-
frequency fields can reduce the accuracy of temperature
readings.
Caution
Do not sharply bend the thermocouple leads.
Repeatedly bending the leads can break
them.
To measure temperature of a coolant temperature sensor:
1. Plug the adapter with thermocouple into the jacks as
shown in Figure 15.
2. Turn the rotary switch to C F.
To toggle between Fahrenheit and Celsius, press
R momentarily.
3. Attach the thermocouple to the sensor.
4. Read the display.
If the meter detects an open (or no) thermocouple,
the display flashes the internal temperature of the
meter.