Non-Contact Infrared Temperature Measurements - Extech Instruments EX850 User Manual

Non‐Contact InfraRed Temperature Measurements
1. Set the function switch to the IR Temp position.
2. Aim the infrared sensor (rear of the meter) at the
surface to be measured.
3. Press the button in the center of the rotary function
switch to turn on the laser pointer and identify the
surface spot to be measured.
4. The area of the surface to be measured must be larger
than the spot size as determined by the distance to
spot size specification.
5. Read the temperature in the display.
Note: See the "Temperature Units" paragraph to select
WARNING: Do not directly view or direct the laser pointer at an eye. Low power visible lasers do
not normally present a hazard, but may present some potential for hazard if viewed directly for
extended periods of time.
IR Spot to Distance Diagram
The 8:1 spot to distance ratio determines the size of the measured surface area with respect to the
distance the meter is held away from the surface.
IR Measurement Notes
1. The object under test should be larger than the spot (target) size calculated by the field of view
diagram.
2. If the surface of the object under test is covered with frost, oil, grime, etc., clean before taking
measurements.
3. If an object's surface is highly reflective, apply masking tape or flat black paint to the surface
before measuring.
4. The meter may not make accurate measurements through transparent surfaces such as glass.
5. Steam, dust, smoke, etc. can obscure measurements.
6. To find a hot spot, aim the meter outside the area of interest then scan across (in an up and
down motion) until the hot spot is located.
Diameter of spot
2.5cm
1.25cm
10cm
20cm
60cm
Distance to object
8
EXTECH INSTRUMENTS
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F or C
7.5cm
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