Measurement Notes; Maintenance; Troubleshooting - Extech Instruments IRT25 User Manual

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. The meter compensates for deviations in ambient temperature. It can, however, take up to
30 minutes for the meter to adjust to extremely wide ambient temperature changes.
7. 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.
Maintenance
Cleaning
To clean the lenses use compressed air to clear dust and other particles, then carefully clean
with a wet cotton swab. The cotton swab should be moistened with clean water.
To clean the meter housing, wipe with a damp, soft cloth. Do not use solvents or abrasives. Do
not immerse the IRT25 in water or other liquid.
Troubleshooting
Symptom
OL display
‐OL display
Battery icon flashes
Blank display screen
No Laser pointer
Problem
Target temperature exceeds range
Target temperature under‐range
Low Battery power
Low battery power
Low battery or environmental
temperature higher than 40°C (104°F)
Action
Select a target within range
Select a target within range
Replace Batteries
Check and/or replace batteries
Replace the batteries or move the
IRT25 to an area with a lower
ambient temperature
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IRT25‐en‐GB_V1.0 2/17
EXTECH INSTRUMENTS