Precautions for using a human body thermometer
Precautions for the use of human body thermometers: Experts from the Chinese Academy of Metrology have provided guidance on the correct use of anti SARS infrared radiation human body thermometers.
Experts point out that infrared radiation thermometers measure the temperature of the human body surface, such as the forehead. The body surface temperature is not only related to the human body temperature, but also influenced by the blood circulation, thermal conductivity, and surface heat transfer conditions under the receptor surface. In order for infrared radiation thermometers to accurately and reliably reflect changes in human body temperature, it is necessary to achieve eight points:
1： Try to require the measured person to stay in the measurement environment for a sufficient period of time, so that the surface heat transfer conditions of the measured person are the same or similar. For example, at an airport, measurements should be taken 10 minutes after passengers arrive at the airport terminal. At this point, the ventilation and temperature conditions in the aircraft building are basically stable, and the external heat exchange conditions on the passenger's forehead are basically similar.
2： The measurement location should be chosen indoors as much as possible, and avoid direct sunlight on the infrared radiation thermometer and the forehead of the person being measured.
3： Accurately estimate the distance of the measured person.
4： The temperature of a person's forehead is generally 1 to 3 degrees Celsius lower than the axillary temperature. At this point, the criterion for a fever's axillary temperature should be converted to the forehead temperature.
5： Infrared ear thermometers measure ear temperature and can be completed within one second. As the eardrum and ear canal are less affected by external environmental conditions, infrared ear thermometers can accurately measure body temperature. The ear temperature of a person is generally 0.4 degrees Celsius higher than the axillary temperature. At this point, the infrared ear thermometer should convert the axillary temperature criterion for fever to the ear temperature criterion.
6： To ensure the accuracy and stability of infrared radiation thermometers, regular calibration comparisons should be conducted with standard calibration devices.
7： Non contact infrared radiation thermometers are divided into industrial and medical types. When measuring body temperature, medical infrared radiation thermometers should be selected because industrial use has a wide range, low resolution, and large errors.
8： Various human body thermometers are ranked in descending order of measurement accuracy: medical thermometer, infrared ear thermometer, and body surface infrared radiation thermometer. From the perspective of preventing SARS, infrared ear thermometers are more accurate than surface infrared radiation thermometers.
