The direct reading dust detector is a portable direct reading dust concentration meter for determining the total dust or respiratory dust concentration in an environment where a flammable and explosive flammable gas mixture is present.
Direct-reading dust detector is used in coal mine or other dust working environment. Portable dust concentration measuring instrument for measuring the direct reading of total dust or respiratory dust concentration. Based on the principle of β-ray absorption method, the separation of impact-type respiratory dust separating device Efficacy meets the "BMRC" Respirable Dust Separation Performance Standard.
Conditions of Use
a) Working temperature: 0 ° C ~ 40 ° C;
b) relative humidity: atmospheric pressure ≤ 95%;
c) Atmospheric pressure: 86kPa~110kPa;
d) Coal mine underground.
installation method
When the dust is measured, it is mounted on the triangular bracket and fixed. The sampling head is in the direction of the wind flow, and the installation height is generally about 1.5m.
According to MT163-1997 "General technical conditions for direct reading dust concentration measuring instrument" and Q/3200KQSY017-2007 "1000 type direct reading type dust measuring instrument" enterprise standard and GB3836.4-2000 standard ExibI level (intrinsic safety type) explosion-proof Designed dust concentration measuring instrument, the separation efficiency of the instrument's respiratory dust separating device fully meets the requirements of the "BMRC" international standard curve, which can accurately and timely reflect the quality of the breathing dust inhaled by the dust collector and the different dust working places. The pollution status of dust provides reliable data for the correct evaluation of the health of the workplace.
Main features of the instrument
The instrument is designed and manufactured according to the ß ray principle, which has unparalleled advantages over other methods of dust measuring instruments. The ray is a kind of electron flow. When its energy is less than 1Mev and the mass of the penetrating substance is less than 20mg/cm2, its absorption is only related to the mass of the absorbing material, and it can directly detect the dust regardless of the physicochemical properties of the absorbing material. The mass concentration does not require any conversion and reduces the human error that is easily introduced in conventional measurements. This method is exactly equivalent to the weighing method, which is equivalent to a nuclear balance.
Due to the design principle, the instrument has no zeroing and drift. The instrument adopts C14 radioactive source ≤100 micro-residue, half-life of 5730 years, fully meets nuclear safety standards, and works stably for a long time without any adjustment. It is safe and reliable.
The instrument is controlled and managed by the microprocessor, manually passed the paper, and the work is automatically performed every cycle. The concentration digital direct reading and the internal storage can be repeated at the end of each cycle. The sampling pump is equipped with a constant current device to automatically compensate for temperature and load changes. Therefore the instrument is extremely simple to operate.
The instrument is equipped with different sampling inlet devices to monitor total dust, respirable dust (flying dust) and respiratory dust (B curve). Compared with the weighing method, the instrument has a correlation coefficient greater than 97% and a relative deviation of less than 10%.
Separation efficiency should meet the requirements of the "BMRC" sampling performance curve.
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