Heng Aode Instrument Factory Direct Sales Radiometer Composition Classification
Thermal radiation meter is a quantitative detection instrument for thermal energy radiation transfer process, and it is an important tool for measuring the amount of thermal radiation migration during thermal radiation process and evaluating the thermal radiation performance. Both the magnitude of thermal radiation characterizes the degree of thermal radiation energy transfer. In other words, a thermal radiometer is an instrument that measures the magnitude and direction of thermal radiation energy transfer.
Constitute
It is composed of radiant heat flow sensor, display instrument and connecting wire.
The display instrument can be a digital voltmeter, a data logger or a data acquisition system.
Radiant heat flux sensor is a classification of heat flux sensor (heat flux sensor).
For example: HNTMR5 Haonat bolometer,
1. Purpose and characteristics
The HNTMR5 Haunat radiant heat meter is a newly developed thermal radiation test instrument that meets the standards of GBZ2 "Occupational Exposure Limits of Hazardous Factors in the Workplace" and GB / T4200 "Classification of High Temperature Operation". It can directly measure the radiant heat value, which is simple and fast. The instrument uses digital display, high accuracy, intuitive reading, and reliable use. It can be used in the fields of labor hygiene, labor protection, heating and ventilation to measure the meteorological conditions of high-temperature working environment and calculate the human body heat balance
2. How to use
1. Radiant heat intensity measurement;
Open the protective cover of the radiation probe and point the probe in the direction to be measured to directly measure the unidirectional radiant heat intensity received at the work place.
Note that during the measurement, do not touch the metal part of the probe with your hands to ensure the accuracy of the test.
2. Battery indication and replacement:
When the word "→" appears in the upper left corner of the meter, it means that the power supply has been reduced to an unusable level, and the power supply needs to be updated.
When reinstalling a new battery, be sure to pay attention to the polarity, and make sure that the power switch is placed in the "off" position, otherwise the instrument may be burned.
3. Maintenance of the instrument
1. The probe of the instrument is a sensitive component during measurement, so scratches, bumps and wear must be avoided. After each use, the radiation probe must be covered with a protective cover.
2. All the components inside the instrument are adjusted at the factory, so do not twist the position of the internal components at will to ensure the accuracy of the test.
3. The instrument should pay attention to moisture and shock.
4. The instrument will not be used for a long time. It is best to remove the built-in battery and store it separately.
classification
According to the wavelength of thermal radiation electromagnetic waves, it can be divided into: total (total radiation + convection) heat flow meter, infrared thermal radiometer, total (infrared + visible light) radiometer, sunlight radiation intensity meter, etc.
According to the ambient temperature, it can be divided into: low temperature thermal radiometer, high temperature thermal radiometer (such as flame calorimeter up to 1900 ℃).
application
Including radiant heating source test, solar radiation intensity and solar equipment test, fire occurrence and protection test, thermal intensity and thermal distribution test of gunpowder, explosive, propellant, thermal intensity and thermal distribution test of various combustion chambers, artificial environment Thermal comfort testing and control, high temperature wind tunnel testing, etc.
Some items in the heat radiation test may need to be considered for heat convection test at the same time.
Some of these tests also have corresponding national standards, such as GB / T 11785-2005, GB / T 4200-1997, GB / T 18204.17-2000, etc.
Development process
Because the thermal radiation sensor is a sensitive element of the thermal radiation meter, the development process of the thermal radiation sensor determines the development process of the thermal radiation meter.
Traditional heat radiation sensors include round foil type (Gardon), plug type (Schmidt Boelter), 2п type and other heat radiation sensors.
The latest thermal radiation sensor is a thin film thermal radiation sensor.
Thermal radiation sensors such as the Schmidt Boelter and 2п are being gradually replaced by fast-response thin-film thermal radiation sensors. However, the circular foil type (Gardon) thermal radiation sensor used for high-speed transient fast measurement (10 ~ 20ms) has been used until now. This is because the response time of the latest fast-response thin-film thermal radiation sensor cannot exceed 20 ms.
The display instrument of the heat flow meter has been developed from the original millivoltmeter and digital voltmeter to the use of high-precision data recorders and data acquisition systems.
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