Measurement precautions for infrared thermometers
Distance ratio to target (light spot)
field of view
environmental conditions
ambient temperature
Emissivity
Distance ratio to target (light spot)
The optical system of the infrared sensor collects the energy from the circular measuring point and focuses it on the detector. Optical resolution is determined by the ratio of the distance from the device to the object and the size of the measured light spot (D:S ratio). The larger the ratio, the better the resolution of the device, allowing smaller spots to be measured from greater distances. The latest in infrared optics is the addition of a near-focus feature, providing accurate measurements of small target areas without undesirable background temperatures.
Infrared thermometer field of view
Make sure the target is larger than the spot size the device is measuring. The smaller the target, the closer you should be. When accuracy is particularly important, make sure the target is at least twice the size of the spot.
environmental conditions
Pay attention to the environmental conditions in the work area. Steam, dust, smoke, etc. can block the lens of the device and prevent measurements. Other conditions such as noise, electromagnetic fields or vibration should also be considered before installation begins. Protective housing, air purification, and air or water cooling protect the sensor and ensure accurate measurements. Therefore, some Raytek products, such as the Thermalert and Marathon series sensors, include air purification functions.
Ambient temperature (ambient temperature)
If the thermometer is exposed to a sudden environment with a temperature difference greater than 20°C, please keep it for at least 20 minutes to allow it to adapt to the new ambient temperature. Raytek fixed sensors are optimized for performance in special ambient temperature ranges. For example, the Raytek MIH can withstand ambient temperatures up to 180°C (356°F) (without water or air cooling). For high ambient temperatures, Raytek offers air cooling and water cooling options as well as accessories such as high-temperature protective boots.
Emissivity
Emissivity is a measure of an object's ability to radiate infrared energy. The energy of radiation indicates the temperature of an object. Emissivity ranges from 0 (smooth mirror) to 1.0 (blackbody). Learn about emissivity and emissivity values for various materials
