Interpretation of Electric Field and Magnetic Fields on Occupational Health New Standards GBZ / T189.3-2018
my country officially implemented the new national standard on occupational health and low frequency electric fields and magnetic fields on July 1, 2019, replaced the 3rd part of the three-part operating field, the new standard increased the magnetic field description, the measurement object, measurement height, reading Do the corresponding regulations.
Standard modification background:
Reference Reference Icnirp International Non - ionic Organization in China. The original GB8702-88 electromagnetic protection regulations have nothing to do with the frequency of 100 kHz, in which occupational health standards 189.3-2007 are only specified for the 50Hz electric field, and the magnetic field and 100kHz are not clearly described below. The description of the power frequency magnetic field limit is a power standard. As living standards continue to increase, the problem of electromagnetic field produced by 100kHz below the product is getting more and more prominent, so the original standard is revised.
Measuring frequency change
The original GBZ / T189.3-2007 measurement frequency 50Hz, only the power frequency electric field.
New standard: GBZ / T189.3-2018, frequency measurement is expanded to 1 Hz ~ 100kHz, suitable for electric fields and magnetic field measurements within 1Hz to 100 kHz
2. Different measurement methods
The original GBZ / T189.3-2007 requires a diameter of 3m in the range, height 1.5M power frequency electric field measurement
New standards: GBZ / T189.3-2018, give more specific indicators (human head, chest, abdomen) for measurement; in detail of measurement point, reading time.
3. Measuring instruments
Original standard only describes the instrument range
The new standards have requirements for frequencies and ranges, and the magnetic field and electric field vector measurements are also described, such as three-dimensional sensors and single-phase satisfaction requirements.
Frequency Description:
The frequency of the instrument response should cover the frequency of the measured device. If the power consumption is measured, the measurement instrument frequency should cover 50 Hz to meet 50 Hz measurements.
Limit description:
The instrument range should reach 0.01 to 10 times the limit, and the maximum amount of instrument should be used in the range of 0.01 to 10 times. For example: the power frequency electric field and magnetic field limit are respectively
Power frequency electric field limit: 4kV / m
Power frequency magnetic field limit: 100UT
Its measurement instrument range can be used within its range
Power frequency electric field: 0.04 ~ 40kV / m (40V / m ~ 40000V / m)
Power frequency magnetic field: 1 ~ 1000UT (1000NT ~ 1MT)
According to the requirements of the new standard GBZ / T189.3-2018, the German FAUSER FM100 low-frequency electromagnetic radiation detector sold by our company meets its provisions.
FM10 low frequency electromagnetic radiation detector frequency range 1 Hz-400kHz, completely covered 100 kHz. The largest range of the instrument magnetic field 20UT, the electric field maximum range 2kv / m, also meets the provisions of the GBZ / T189.3-2018. The FM10 low-frequency electromagnetic radiation detector has an electric field and a magnetic field simultaneous measurement, and there is no need for correlation. Power on, easy to use. Optional 1GB recorder can perform low-frequency electromagnetic environment monitoring for a long time.
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