Designing And Implementation Of Synchronous Dust Breathe Measure

There were a lots of instruments at home and abroad used to sample the dust, poisonous substance. The designing principles mostly were to imitate the human body breath or according the inhale circumstance .These sample instruments used in fixed-point or individuals generally were to adopt the machine motive to inhale, and get the fixed amount by filter membranes or absorber , then compute the density of poison or workday inhale amount according to the volume. We design a new sampler, which can better reflect the level of dust and chemical substance inhaled. It is directly placed on the nose and mouth of the worker. This sampler, make use of the human body nature breathe conduct; can pump air samples into the sampler without any power. The spot sampler can change at will with the human body homework, can sample with breath synchronously. The sample volume can change with the strength of the labor. It is obviously true that this method is closely matching the human body which gets in touch with the dust and poison substance in the work environment. According the pulmonary ventilations and dust densities and swimming SiO2 etc, it can also calculate "the ratings of the labor strength " and " the ratings of the dust hazardous degree."The actual breath quantity of the workers has relations with the pressure, temperature and time. The new instrument consists two parts, which is a sampler and a mainframe. The sampler is placed on the nose and mouth of the worker, which makes use of the human breath to inhale airs and pass the airs into the sensor. Thesensor samples the pressure and transfer to electricity and transmit it to the mainframe. It consists of a cover and a sampler and a flow conduct detector. The mainframe is placed on waist of the worker, which consists of single microcomputer, memory, A/D conversion, temperature sensor, atmospheric pressure sensor, keyboard and display etc. It can test the temperature, pressure and sampling times. It also can calculate and save the data.The test of the synchronous dust sampler is classified two steps; the first step is to verify the instrument, which includes the verifying of the closet of breath and inhale valet and the verifying of the resistance of the inhale and the verifying the input parameters and the verifying of the sample volume. The second step is spot experiment. We use synchronous dust test instrument, the normal regulations fixed-point dust sample instrument, the individual dust sample instrument and the pulmonary ventilation test instrument in the same spot to carry on the sample. We carry on the test in many spots, and acquire the valid samples totally. The statistics results show that the pulmonary ventilation is consistence with the results of the pulmonary ventilation test instrument, the dust density result has no evidence difference with the result of the normal regulations fixed-point dust sample instrument and the individual dust sample instrument, and it has evidence correlative with the results of the individual dust sample instrument. Multi-function breath synchronous sample instrument makes use with the human body breathe for motive, carries on breath to sample synchronously. This method is more objective and true.According the design principles of breathe synchronous dust testing instrument, the sample result can really reflect the measure of the inhalation of the dust and the poisonous substance, and it can obtain the lung ventilation synchronously. It also can protect the worker's health because the sample is placed on the face of the worker.The use of the synchronous breath dust sample instrument can develop and perfect monitoring and studying, and to strengthen the management. It has the aggressive meaning in promoting occupation hygiene and working safety.