What does it mean when an infrared thermometer shows LO?
The infrared thermometer has a temperature range of -50 ℃ to 550 ℃. When LO appears, it means that the detection temperature is below the lower limit, which means that the object you are measuring has a low temperature below -50 ℃! It could also be due to low battery levels.
Error analysis of infrared thermometer
Due to the non-contact nature of infrared thermometers, their measurement results are influenced by many factors. From the perspective of the instrument itself, there are several aspects: using a non isothermal blackbody as a calibration source, differences in instrument emissivity, scaling or wear of air media and instrument lenses, etc; From the perspective of external factors, the measurement results are influenced by factors such as the emissivity of the object being measured, the measurement distance coefficient, and the temperature of the external environment.
Solution to the Error of Infrared Thermometers
In applications, on-site comparison and calibration methods are generally used to minimize these effects. Depending on the actual calibration needs, several calibration temperatures are selected accordingly, and the calibration sequence is from low temperature to high temperature. First, set the emissivity ε=1 of the object for calibration, and then adjust the ε value to make the display temperature consistent with the calibration temperature. Read the indication of ε=1 and the adjusted indication of ε ≥ 1. Repeat reading several times at each calibration point, and then conduct data processing. For thermometers whose indication error and repeatability meet the requirements, mark its s value.
