As is known to all, the COVID-19 virus as a highly infectious virus has begun to spread around the world. In this epidemic prevention and control work, the most commonly used tools are infrared thermometers such as forehead thermometers, ear thermometers, infrared screening instrument and thermal imagers. The accurate measurement of thermometer plays an important role in screening fever patients.
There are two types of thermometers: Contact thermometers and non-contact thermometers. Contact thermometers are: glass thermometer and medical electronic thermometer. And Non-contact thermometers are: infrared forehead thermometer, infrared ear thermometer, infrared screening equipment, thermal imaging equipment, etc.
The calibration of different thermometers should refer to different national standards. For thermometers with large errors, they can be safely used after being sent to the measurement department for verification or calibration.
1. Contact thermometer
The national verification regulation of glass thermometer requires the use of second-class standard platinum resistance thermometer and supporting electrical measuring equipment as the standard device:
Electrical measuring equipment shall not be lower than 0.02 level;
The resolution shall not be less than 0.1M Ω;
The uniformity of incubation bath in the range of (30-45) ℃ is not more than 0.01 ℃;
The stability is not more than 0.01 ℃ / 10min;
The water three-phase point device is used to provide the water three-phase point resistance value of the standard platinum resistance thermometer.
The national verification regulation of medical electronic thermometer also requires the second-class standard platinum resistance thermometer, and the relative error is not more than 50ppm;
The thermostatic bath is in the range of (0 ~ 50) ℃;
Uniformity shall not be greater than 0.02 ℃;
The stability is not more than 0.02 ℃ / 10min and the water three-phase point device.
For the above two kinds of thermometers, BuenoBiotech can provide high-precision calibration thermo bath such as BRTS-0520 series.http://buenobiotech.com/products/calibration-thermo-bath/infrared-forehead-thermometer-calibration-bath-blackbody-radiation-calibration-bath.html
2. Non-contact thermometer
The infrared ear thermometer is more complex than the contact method because it uses the non-contact measurement principle, so it needs special equipment. A blackbody cavity with emissivity no less than 0.999 needs to be placed in a constant temperature bath to provide a constant temperature environment.
For infrared thermometer and other instrument used for rapid screening of human body surface temperature, please refer to the calibration specification of infrared thermometer for measuring human body temperature. The technical requirements for temperature source are as follows:
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Technical requirements of blackbody radiation source |
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Thermometer type |
Effective emissivity of cavity |
Temperature control stability (C /10min) |
Radiation temperature uncertainty (k=2) |
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Infrared ear thermometer |
More than 0.998 |
Less than 0.02 |
Not greater than the maximum allowable value of the compared thermometer 1 / 3 of the absolute value of error |
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Infrared surface thermometer |
More than 0.997 |
Less than 0.02 |
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Infrared body surface temperature Rapid screen |
More than 0.997 |
Less than 0.1 |
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For the above infrared thermometers, BuenoBiotech can provide high-precision calibration thermo bath such as BRTS-0520 series.http://buenobiotech.com/products/calibration-thermo-bath/infrared-forehead-thermometer-calibration-bath-blackbody-radiation-calibration-bath.html with cone-shaped blackbody chamber to provide constant temperature environment
