Infrared thermometer in equipment troubleshooting precautions
Atmospheric attenuation of the impact: the measured surface of the electrical equipment infrared radiation energy, transmitted by the atmosphere to the infrared detection instrument, which will be subject to atmospheric combination of water vapour, carbon dioxide, carbon monoxide and other gases such as molecules absorbed attenuation and the impact of the air in the air of the suspended particles of the attenuation of scattering. The attenuation of radiation energy transmission of equipment with the detection instrument to the distance between the equipment under test, will reduce the transmission rate of radiation from the equipment under test, so its attenuation is increased with the increase in distance. Reduce the inspected equipment fault parts and normal parts of the radiation contrast, but also because the infrared instrument received a reduction in the target energy, so that the temperature displayed by the instrument is lower than the actual temperature value of the measured fault point, resulting in missed detection or misdiagnosis, especially for the detection of low temperature rise when the equipment failure. Detection distance increases, the influence of the atmospheric combination will be more and more. In this way to obtain the accuracy of the target temperature, measurement needs to try to choose the environment atmosphere is drier, cleaner seasons for detection; in the conditions do not affect the ** shorten the detection distance as much as possible, while the need for temperature measurements for a reasonable distance correction, in order to measure the actual temperature value.
The impact of meteorological conditions: poor meteorological environment (rain, snow, fog and high winds, etc.), the temperature of the equipment will be detrimental to the detection of adverse effects, often giving false fault phenomena. In order to reduce the impact of meteorological conditions, try to detect at night when there is no rain, no fog, no wind and the ambient temperature is more stable.
Environment and the impact of background radiation: in the outdoor power equipment infrared detection, detection instruments to receive infrared radiation in addition to the corresponding parts of the equipment to be inspected in addition to their own radiation, will include other parts of the equipment and the background of the reflection, as well as directly into the solar radiation. These radiations will interfere with the temperature of the part of the equipment to be tested, bringing errors to fault detection. In order to reduce the impact of environmental and background radiation, outdoor electrical equipment on-site infrared detection, as far as possible, choose to carry out in cloudy days or in the sunset and evening without light time. This prevents direct incidence, reflection and scattering of solar radiation; indoor equipment can be used to turn off the lights, as well as to avoid the impact of other radiation. For highly reflective equipment surfaces, appropriate measures should be taken to reduce the impact of solar radiation and the surrounding high-temperature object radiation, or to change the detection angle, to find a reflection can avoid the * best angle for detection. In order to reduce the impact of solar radiation and the surrounding high temperature background radiation, in the detection of appropriate shielding measures, or in the infrared measuring instrument with appropriate infrared filters, in order to filter out the sun and other background radiation. Select the appropriate parameters of the instrument and the detection distance for detection, so that the parts of the equipment under test in the instrument field of view range, thereby reducing the interference of background radiation.
