Standard for Infrared Thermometers ASTM E 1965-98 of Blackbody Calibrator
1. IR thermometer can be divided into two types: Ear temperature gun and Forehead temperature gun. The ear temperature gun is used to evaluate the internal temperature of the main body. The forehead temperature gun is used to evaluate the main external surface temperature.
2. Temperature display range:
In any display mode, the ear thermometer shall display the body temperature in the minimum range of 34.4 to 42.2 ° C ( 94.0 to 108.0°F ).
The forehead thermometer shall display the main body temperature with a minimum temperature range of 22 to 40.0 ° C ( 71.6 to 104.0°F ).
3. Maximum permissible laboratory error (for Ear Thermometer):
The Blackbody temperature range is from 36 to 39 ° C ( 96.8 to 102.2°F ), laboratory error d is not more than 0.2 ° C ( 0.4°F )
The Blackbody temperature range is less than 36 ° C ( 96.8°F ) or more than 39 ° C (102.2°F ), and the laboratory error d is not more than 0.3 ° C (0.5°F )
4. Maximum permissible laboratory error (for Forehead Thermometer):
The Blackbody temperature range is from 22 to 40.0 ° C ( 71.6 to 104.0°F ), laboratory error d is not more than 0.3 ° C (0.5°F )
5. Test method
Under laboratory conditions, IR thermometers should be tested according to the blackbody standard. The true temperature of the blackbody shall be monitored by immersion or immersion thermometer with an uncertainty of no more than +-0.03° C
A. The ear thermometer test should be repeated at three blackbody temperatures: 35° C, 37° C, and 41 ° C (95°F, 98.6°F, and 105.8°F), within +- 0.5 ° C
Before measurement, the IR thermometer shall be stabilized at the specified ambient temperature and humidity for at least 30 minutes or longer. Measure at least 6 times at each blackbody temperature at each corresponding operating temperature and humidity. The number of readings shall be the same for each combination. In each mode, three sets of data shall be formed.
B. The skin contact IR thermometer test should be set at three designated blackbody temperatures: 23° C,, 30° C,, and 38 ° C, (73°F, 86°F, and 100°F), within +- 1 ° C
6. Standard blackbody cavities are made of metal with high thermal conductivity, preferably oxygen free copper. The outer surface of the cavity is coated with a thin layer of nickel gold to prevent oxidation. The inner surface of the cavity is coated with a thick layer of dry organic enamel between 20-50um. The empty body is immersed in a circulating water bath. The tank shall have a volume of 2L or more, and the stability shall be within plus or minus 0.02 ° C.
Contact thermometers should be placed in a water bath close to the blackbody cavity.
