The great river, the video reporter
Recently, following news that the mercury thermometer will leave the market in 2026, a number of people are concerned about the use of electrostatic thermometers and the infrared thermometers being insufficiently accurate. So, are electrostatic thermometers, ear-temperature guns, e. G. Thermometers really less accurate than mercury thermometers? What choice should be made of electrostatic thermometers, ear-temperature guns, e-temperature guns? In response to issues of concern, the newspaper daa river whip video reporter contacted henan metering experts for interpretation。
Expert questions the difference between electrons, infrared thermometers, mercury thermometers
As a result of the epidemic, thermometers of various types have become high commodities. At present, domestic thermometers sold on the market consist mainly of mercury thermometers, electrostatic thermometers and infrared thermometers, such as guns, ears, etc. The mercury thermometer is more popular to consumers than the multi-hundred-dollar electron thermometer, the infrared thermometer, and each multi-dollar mercury thermometer, especially after the subject of the total production ban since 2026 has been on the hot list。
Along with thermal sales of thermometers, concerns have been raised as to whether the electron thermometer, the infrared thermometer, although more technologically advanced and faster in measurement, is less accurate than the mercury thermometer, and whether there is a deviation in measuring body temperature。
In response, sun xiaochu, director of the thermal institute of the henan scientific institute of metrology and testing, and secretary-general of the henan technical commission for thermal and meteorological measurement, told daheru that electrons and infrared thermometers could be influenced by the stability of electronic components and environmental factors, while mercury thermometers were the most reliable for measuring the temperature of mercury by using thermal inflationary properties of mercury (silver)。
“the greatest difference between the three thermometers is between stability and environmental requirements, such as the infrared thermometer, which requires a normal operating environment of 16°c ~ 35°c, which does not meet the requirements for use in cold, cold, cold, hot, hot or windy environments and therefore does not have reference value.”
Sun xiaoqin described the infrared thermometer as a measure of human temperature through the collection of infrared thermal radiation energy from the human body, suitable for use as a preliminary and rapid screening of body temperature, and the final determination of a fever using a mercury thermometer or an electronic thermometer if those screening for abnormal body temperature were required. Infrared thermometers measure accuracy at 35 °c ~ 42 °c ± 0. 2 °c, 32 °c ~ 34. 9 °c and 42. 1 °c ~ 43 °c。
The electron thermometer is the conversion of measured temperature signals to telecommunications or digital signals using temperature sensors, which are digitally displayed through monitors (lcds, digital tubes, led matrices) after internal integration circuit recognition and processing, and are capable of recording, reading and reading the highest values of measured body temperature。
The mercury thermometer, which is an expanding thermometer, works on the principle that the effect of the mercury receptor temperature in a glass bubble is slightly different, and that the expansion of the mercury volume allows for a significant change in the length of the mercury column in the measuring tube, resulting in measurements; its internal structure allows the mercury column to remain at its highest position at the measurement of the body temperature, so it still shows the temperature of the human body when it leaves the body. The later mercury thermometer should be “backwatched”, i. E., the upper side with the thermometer should be pushed down so that the mercury that had been lifted into the measuring tube could be re-entered into the glass bubble for the next measurement。
“in sum, the exposure thermometer is more accurate than the non-exposure thermometer, of which the mercury thermometer is the most stable.” sun xiaochu said。
With regard to whether new products will be introduced after the mercury thermometers are released, sun xiaochuan said, “for the time being, we are also studying mercury-like non-toxic liquid work media, which is the next step in the search”。
Selective thermometers recognize these standards
Body thermometers are thermometers, thermometers for measuring human temperature, which can be measured by thermal inflating cooling principles of mercury or other liquids, or by temperature sensors. The main areas where body temperature is commonly measured are those of forehead, snail, mouth, armpit, etc. In terms of classification, there are mainly glass thermometers, electrostatic thermometers, multifunctional infrared thermometers, tablet thermometers and “pharmaceutical” internal thermometers。
In order to regulate the technical characteristics of products and ensure their effectiveness and safety, relevant standards have been developed as a basis for production and quality control, such as the glass temperometer (gb1588-2001) and the medical electronic temporometer (gb/t21416-2008) part 1: medical infrared temporometer (gb/t21417. 1-2008) " clinical body temperometers - electronic temperometer performance requirements for continuous measurements (yy0785-2010) " , " t/zzb0999-2019) " , " jjg111-2019 " , " medical electronic temporometers (jjg1162-2019) " , and " medical electrical equipment part i: general requirements for safety (gb9706. 1-2007) " 。
The standards set out the terms and definitions, requirements, test methods, inspection rules and markings, instructions for use, packaging, transport, storage of products. Among them, “gb” represents the national standard, “yy” represents the industry standard, “t” represents the group standard, “jjg” is the initial letter of the national measurement control protocol, and it is possible to observe whether or not the above criteria are being applied in the production of the product when selecting a thermometer。
