Infrared digital thermometers are designed for instant temperature measurement in hard-to-reach areas and can be categorized into contact and non-contact types. Key parameters for selecting an infrared thermometer include emissivity, distance to spot ratio, and operating specifications such as temperature range and accuracy. Safety precautions are essential when using these thermometers, such as inspecting for damage and avoiding reflective surfaces.

1. Infrared Digital
Thermometers

2. Infrared thermometers are designed for applications
requiring users to instantly measure temperature in
hard-to-reach areas
http://www.fluke.com/fluke/inen/products/Thermometers.htm

3. Temperature measurement
• Contact Type Thermometers
– Uses temperature probes / thermo-couples
– Highly accurate, good for Lab / calibration work
• Non-Contact Thermometers
– Uses Infra Red beams to measure surface temperature
– Moderate accuracy for day to day work
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4. Why IR thermometers - 3 main reasons
• Safety
– From high temperature objects
– From high voltages (temperature at circuit
breakers terminals, bus-bars)
– Moving objects - Rotating motors, conveyors,
belts
• Hard to Reach
– Object mounted at heights
– Object mounted inside safety perimeter
– Objects at hard to reach places
• Convenience
– IR thermometer is easy to use
– Just point-shoot-measure
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5. Important Parameters – IR Thermometers
• Emissivity
• A numerical value between 0 and 1 which indicates the ability of an
object to emit infrared energy.
• Emissivity is determined primarily by the material from which an
object is constructed and its surface finish.
• Examples:
– Polished brass: 0.03
– Roughly polished copper: 0.07
– Black lacquer paint: 0.96
– Circuit boards
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6. Important Parameters – IR Thermometers
• DISTANCE TO SPOT RATION
Ratio of the distance from the measured object vs. sampling
spot size
EXAMPLES:
- 4:1 optical resolution: 4” away from measured object 1”
diameter
- 12:1 optical resolution: 24” away from measured object 2”
diameter
• OBJECT SIZE
Know your application! An IR device with a 4:1 optical
resolution
can not effectively be used to measure a diffuser temperature
15’ away.
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7. Important Parameters – IR Thermometers
FIELD OF VIEW
- Field of view refers to the target size relative to the IR thermometer’s spot size .
- Ideally, the target surface to be measured should be twice the size of the spot .
- If the spot size is larger than the surface to be measured, measurement errors are
increased .
- Spot size calculator www.Fluke.Com
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8. HOW DOES IR THERMOMETER WORK
Infrared thermometers measure the surface
temperature of an opaque object
The thermometer’s optics sense emitted,
reflected, and transmitted energy, which is
collected and focused onto a Detector
The unit’s electronics translate the information
into a temperature reading which the unit
displays
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9. IMPORTANT SPECIFICATIONS
FOR SELECTION OF RIGHT IRTHERMOMETER
• Temperature range
• Measurement accuracy
• Distance to Spot Ratio
• Rugged & Reliable
• Response time
• Display resolution
• Battery life
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10. OPERATING THE IR THERMOMETER
• To measure temperature, point the thermometer at an object and pull the trigger.
• Laser pointer to help aim the thermometer
• To find a hot or cold spot, aim the thermometer outside the desired area.
• As the distance from the object being measured increases, the spot size of the area
measured by the unit becomes larger
• For accurate measurements, make sure that the target is larger than the unit’s spot
size
• The display retains its last infrared measurement for twenty seconds when the trigger
is released, with HOLD appearing on the display
• The stored data can be downloaded to a personal computer (PC) via the
included USB cable and the included Fluke View Forms Documenting Software
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11. SAFETY PRECAUTIONS
• Before using the thermometer inspect the case. Do not use the thermometer if it appears
damaged. Look for cracks or missing plastic. Pay particular attention to the insulation
around the connectors
• Disconnect the thermocouple(s) from the thermometer before opening the case
• Replace the batteries as soon as the battery indicator appears. The possibility of false
readings can lead to personal injury
• Do not use the thermometer if it operates abnormally. Protection may be impaired. When
in doubt, have the thermometer serviced / calibrated at authorized labs.
• Reflective objects result in lower than actual temperature measurements. These objects
pose a burn hazard
Do not operate the thermometer around explosive gas, vapor, or dust
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12. • Company Name : Fluke Corporation - India
• Website: http://www.fluke.com/fluke/inen/home/default.htm
• Address: Division of DHR Holding India Pvt. Ltd.
10th Floor, Sigma
Hiranandani Business Park, Powai
Mumbai, Maharashtra 400076
• Contact Number: 1 800 209 9110
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13. Thank You