Amprobe IR-712 IR-720 IR-730 Infrared-Thermometers - Manual (Page 13)

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2. The instrument cannot measure through transparent surfaces such as glass. It will measure the surface
temperature of the glass instead.
3. See Table of Surface Emissivity for use in measuring shiny or polished metal surfaces (stainless steel,
aluminum, etc.).
4. Steam, dust, smoke, etc., can prevent accurate measurements by obstructing the instrument’s optics.
TYPICAL MEASUREMENTS
This section describes a variety of measurements often performed by technicians.
Reminder:
• User may select to turn on or off the backlight and laser whenever you are making readings with the
thermometer.
• Relatively high emissivity normally means emissivity setting of about 0.95.
• Relatively low emissivity normally means emissivity setting of about 0.30.
• When user cannot identify the emissivity of the object to be measured, user could cover the surface to be
measured (temperature >150°C) with black electric tape (emissivity of about 0.95). Allow time for the tape
to reach the same temperature as the object to be measured. Measure and record the temperature of the
tape.
Aim the thermometer at the object to be measured, adjust the emissivity setting to make it as the same temperature
as the tape. At this time, the thermometer emissivity setting is close to the emissivity of the object to be measured,
measurement may be taken.