CN201402268Y - Intelligent environmental air quality monitor - Google Patents
Intelligent environmental air quality monitor Download PDFInfo
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- CN201402268Y CN201402268Y CN 200920105888 CN200920105888U CN201402268Y CN 201402268 Y CN201402268 Y CN 201402268Y CN 200920105888 CN200920105888 CN 200920105888 CN 200920105888 U CN200920105888 U CN 200920105888U CN 201402268 Y CN201402268 Y CN 201402268Y
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Abstract
The utility model relates to an air quality monitor, comprising a sampling pump, an air monitoring passage, an inhalable particle monitoring passage and a microprocessor. The inhalable particle monitoring passage comprises a cutter and a detector, the sampling pump pumps inhalable particles into the cutter, the cutter removes oversize particles in the inhalable particles and sends the inhalable particles into the detector, the detector generates pulse in proportion to concentration of the particles and sends the pulse to the microprocessor, the microprocessor calculates the concentration of the particles via the pulse, the air monitoring passage comprises a filter and at least two air sensors, the sampling pump is used for pumping air into the filter, the filter is used for filtering impurities and water in the air and then sending the air to the air sensors, the air sensors are used for generating current signals in proportion to the concentration of the air and then sending the current signals to the microprocessor, and the microprocessor calculates the concentration of the air via the current signals. The monitor can monitor concentrations of various gases and particles simultaneously.
Description
Technical field
The utility model relates to the environmental monitoring technology field, particularly a kind of intelligent ambient air quality monitor.
Background technology
Along with China's rapid economy development, environmental protection problem becomes increasingly conspicuous, and the first step of environmental protection is exactly environmental monitoring.Along with the frequent generation of burst accident in recent years, carried out national environment protection key cities air-polluting prediction.The plantation of pollution-free food, organic food, production also need the air quality of planting environment is monitored.Environmental forecasting has been brought into play vital role for instructing industrial and agricultural production and ecologic environment.The emergency monitoring center of country-driven blue-sky project and foundation all needs a large amount of portable air quality monitoring instrument.
China overwhelming majority's large-and-medium size cities have been set up the air quality monitoring system basically at present, but he does not possess mobility, and cost is big, and maintenance cost is very high.Because its high expense, many small and medium cities do not have strength to be equipped with these systems, or stop using in the configuration back.At present widely used is air sampler and particle sampler, but these instruments want to dispose in the laboratory earlier absorption liquid, and sampling in the scene of delivering to then, takes the laboratory at last again and carry out data analysis.So not only troublesome poeration, and stochastic error and cumulative errors are all very big, cause final data inaccurate.
Though the monitor of the monitoring of environmental air quality that existing at present cost is low, a present monitor can only be monitored gas separately or be monitored pellet separately, can not monitor gas and pellet simultaneously.A present monitor can only monitoring rate than single S O
2, NO
2Or two or three kind of gas of CO, can not change the gaseous species of monitoring according to the varying environment situation arbitrarily, and when two or three kind of gas of monitoring, also have cross one another interference between the gas sensor that instrument adopted, cause the measurement result deviation bigger, can't accurately judge gaseous species.
The utility model content
Problem to be solved in the utility model provides a kind of intelligent ambient air quality monitor, can monitor the concentration of pellet in the air and the concentration of multiple gases simultaneously.
The utility model provides a kind of intelligent ambient air quality monitor, comprising: sampling pump, gas-monitoring passage, pellet monitoring channel and microprocessor;
Described pellet monitoring channel comprises: cutter and detecting device; Described sampling pump is used for pellet is drawn into described cutter; Described cutter is used for removing the oversize grain of described particle, sends into described detecting device; Described detecting device is used to produce the pulse that is directly proportional with particle concentration, with described pulse transmission to described microprocessor; Described microprocessor is used for being calculated by described pulsimeter the concentration of described particle;
Described gas-monitoring passage comprises: filtrator and at least two gas sensors; Described sampling pump is used for air is drawn into described filtrator; Described filtrator is used for sending into described gas sensor behind the impurity of filtered air and the moisture; Described gas sensor is used for producing and the proportional current signal of gas concentration, sends described current signal to described microprocessor; Described microprocessor is used for being calculated by described current signal the concentration of described gas.
Preferably, described gas sensor is an electrochemical sensor.
Preferably, also be provided with flow sensor after the described sampling pump, be used to monitor the flow of the air that sampling pump is drawn into, send described flow to described microprocessor; When the described flow of described microprocessor judges is below or above the preset flow rate value, the aperture of the screen of control setting after described flow sensor.
Preferably, also be provided with heater coil on the described sampling pump pipeline, also be provided with Temperature Humidity Sensor after the described filtrator;
Described Temperature Humidity Sensor is used to monitor the humiture of gas, sends described humiture to described microprocessor; The described humiture of described microprocessor judges is lower than when being scheduled to the humiture value, and sending controling instruction is to described heater coil, and described heater coil is described sampling pump pipeline heating.
Preferably, described gas sensor is an infrared sensor, comprises infrared radiation source, measuring sonde and reference probe;
Tested gas enters air chamber, is provided with described infrared radiation source in the described air chamber; Described infrared radiation source is used to reflect gas in described measuring sonde with reference to probe; The filter that is covered with on the described measuring sonde is used for that section spectrum through the tested gas absorption of infrared spectrum; Described with reference to the filter that is covered with on the probe, be used for seeing through the non-absorbent spectrum of the tested gas of infrared spectrum; Described two probes are exported the level that an infrared light intensity that contacts with its surface is directly proportional separately; Described measuring sonde and the ratio of going up output level with reference to popping one's head in are used to calculate the concentration of tested gas.
Preferably, be provided with temperature sensor in the described probe or near the probe, be used for described infrared sensor is carried out temperature compensation.
Preferably, described cutter is PM10, PM5, PM2.5 or overall suspended pellet TSP type.
Preferably, described monitor also comprises liquid crystal display, is used to show gas and the related data of pellet and the duty of monitor of monitoring.
Preferably, the communication interface of described monitor comprises: wireless transmission interface, USB (universal serial bus), RS232 and/or RS485.
Preferably, described wireless transmission interface is GPRS or CDMA.
Preferably, the power supply of described monitor adopts AC power interface and the dual-purpose power-supply system of direct supply interface, is provided with electrical isolation and photoelectricity between described AC power interface and the extraneous power supply and isolates; Described direct supply interface directly connects battery.
The utility model also provides a kind of pellet monitor, comprising: sampling pump, cutter, detecting device and microprocessor; Described sampling pump is used for pellet is drawn into described cutter; Described cutter after being used for removing the oversize grain of described particle, is sent into described detecting device; Described detecting device is used to produce the pulse that is directly proportional with particle concentration, with described pulse transmission to described microprocessor; Described microprocessor is used for being calculated by described pulsimeter the concentration of described particle.
The utility model also provides a kind of gas monitoring instrument, comprising: sampling pump, filtrator, at least two gas sensors and microprocessor; Described sampling pump is used for air is drawn into described filtrator; Described filtrator is used for sending into described gas sensor behind the impurity of filtered air and the moisture; Described gas sensor is used for producing and the proportional current signal of gas concentration, sends described current signal to described microprocessor; Described microprocessor is used for being calculated by described current signal the concentration of described gas.
Compared with prior art, the utlity model has following advantage:
A kind of intelligent ambient air quality monitor that the utility model provides comprises pellet monitoring channel and gas monitoring channel, particle concentration monitoring be by detecting device according to light scattering principle, produce the pulse that is directly proportional with particle concentration.Microprocessor is calculated the concentration of particle according to described pulsimeter.Comprise a plurality of gas sensors in the gas-monitoring passage, the air of sampling pump collection is sent into each gas sensor passage respectively.Each gas sensor only with own corresponding gas sensitization, thereby chemical reaction takes place, the current signal that generation is directly proportional with gas concentration.Microprocessor calculates the concentration of corresponding gas according to described current signal.The utility model can add and change described gas sensor as required arbitrarily, realizes the concentration monitor to gas with various.The principle that the utility model monitoring particle and gas concentration adopt can effectively reduce the volume of monitor, makes the described monitor can be portable.
Description of drawings
Fig. 1 is based on the utility model air quality monitoring instrument first example structure figure;
Fig. 2 is based on the structural drawing of the utility model monitor gas-monitoring;
Fig. 3 is based on the structural drawing of the utility model monitor pellet monitoring;
Fig. 4 is based on the second example structure figure of the utility model monitor.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, this figure is based on the utility model air quality monitoring instrument first example structure figure.
The utility model provides a kind of intelligent ambient air quality monitor, comprising: sampling pump 101, gas-monitoring path 10 2, pellet monitoring channel 103 and microprocessor 104.
Described gas-monitoring path 10 2 comprises: filtrator 102a and at least two gas sensor 102b, be used for producing and the proportional current signal of gas concentration, and send described current signal to described microprocessor 104.
Described microprocessor 104 is used for being calculated by described current signal the concentration of described gas.
Described pellet monitoring channel 103 comprises: cutter 103a and detecting device 103b.
Described sampling pump 101 is used for pellet is drawn into described cutter 103a.
Described cutter 103a is used for removing the oversize grain of described particle, sends into described detecting device 103b.
Described detecting device 103b is used to produce the pulse that is directly proportional with particle concentration, with described pulse transmission to described microprocessor.
Described microprocessor 104 is used for being calculated by described pulsimeter the concentration of described particle.
The intelligent ambient air quality monitor that the utility model provides comprises pellet monitoring channel and gas monitoring channel, particle concentration monitoring be by detecting device according to light scattering principle, produce the pulse that is directly proportional with particle concentration.Microprocessor is calculated the concentration of particle according to described pulsimeter.Comprise a plurality of gas sensors in the gas-monitoring passage, the air of sampling pump collection is sent into each gas sensor passage respectively.Each gas sensor only with own corresponding gas sensitization, thereby chemical reaction takes place, the current signal that generation is directly proportional with gas concentration.Microprocessor calculates the concentration of corresponding gas according to described current signal.The utility model can add and change described gas sensor as required arbitrarily, realizes the concentration monitor to gas with various.The monitoring principle that the utility model monitoring particle and gas concentration adopt can effectively reduce the volume of monitor, makes the described monitor can be portable.
In order to make those skilled in the art implement the utility model better, introduce the concentration monitoring principle of pellet and gas below respectively.
Referring to Fig. 2, this figure is the structural drawing based on the utility model monitor gas-monitoring.
The gas-monitoring structure comprises sampling pump 101, filtrator 102a, gas sensor 102b, Temperature Humidity Sensor 201, pre-amplification circuit 202, connects tracheae 203, heater coil 204 and microprocessor 104.
At first, sampling pump 101 is drawn into filtrator 102a with air.
Airborne impurity of filtrator 102a filtering and moisture are sent the air after filtering into different gas sensor 102b and Temperature Humidity Sensor 201 respectively.
Need to prove, couple together by connecting tracheae 203 between each monitoring element of whole gas-monitoring passage.Certainly, there are several gas sensors just to need several monitoring channels.For example, when 5 gas sensors, 5 independently gas-monitoring passages will be set, sampling pump will be drawn into the air that comes and send into every monitoring channel respectively.
Gas sensor adopts decides electrochemical sensor or infrared ray sensor monitoring gas concentration.
Electrochemical gas sensor is a kind of micro fuel cell element, and it can directly reflect gas concentration and needn't reflect by dividing potential drop.
Oxidation or reduction reaction take place on the induction electrode surface in the gas that diffuses into sensor, produce an internal current between two electrodes, and current value externally inserts a pull-up resistor and just can detect it corresponding to gas concentration in the circuit.
Cause the misjudgment of gaseous species for fear of the cross interference between gas, portion gas adopts the infrared ray sensor principle in the present embodiment.
Described infrared sensor comprises infrared radiation source, measuring sonde and reference probe;
Tested gas enters air chamber, is provided with described infrared radiation source in the described air chamber; Described infrared radiation source is used to reflect gas in described measuring sonde with reference to probe; The filter that is covered with on the described measuring sonde is used for that section spectrum through the tested gas absorption of infrared spectrum; Described with reference to the filter that is covered with on the probe, be used for seeing through the non-absorbent spectrum of the tested gas of infrared spectrum; Described two probes are exported the level that an infrared light intensity that contacts with its surface is directly proportional separately; Described measuring sonde and the ratio of going up output level with reference to popping one's head in are used to calculate the concentration of tested gas.
Detected gas enters air chamber by the stainless steel spark arrester of a sintering.There is a lamp that the round-robin infrared light supply is provided in the air chamber.Light source reflects in air chamber and ends on two thermoelectric probes.Two are visited first is " measuring sonde ", and another is " with reference to a probe ".When tested gas enters air chamber, gas absorption one section of infrared radiation, also weaken from the signal that measuring sonde is exported like this with regard to corresponding.Although and have tested gas to exist, the signal level on " with reference to probe " remains unchanged.
Because of the output signal of infrared sensor changes because of temperature variation, the temperature output that raises increases, and temperature reduces output and diminishes.For the accuracy that guarantees to measure, in described probe or near the probe, be provided with temperature sensor, be used for described infrared sensor is carried out temperature compensation.
General infrared sensor output signal under normal temperature and finite concentration is a standard, deviation will take place in output signal after temperature changes, by microprocessor the temperature sensor signal that records is offset the signal that changes on the infrared sensor, and then reach the purpose of compensation.
The humiture of Temperature Humidity Sensor 201 monitoring air sends humiture to microprocessor 104.
When microprocessor 104 judged that described humiture value is lower than predetermined humiture value, sending controling instruction was to heater coil 204, and heater coil 204 heats for monitoring channel.Be in order to use temperature and humidity compensation, to make the gas concentration of measurement more accurate like this.
Airborne all gases respectively with corresponding sensor generation chemical reaction, the current signal of generation is sent into microprocessor 104 after handling through pre-amplification circuit module 202.
After 104 pairs of data process temperature and humidity compensations of microprocessor and the linear process, calculate the concentration of corresponding gas.Simultaneously, to the result data comparison of transfiniting,, then report to the police if the concentration of certain gas surpasses desired indicator or content.
Need to prove that the described monitor of present embodiment also comprises liquid crystal display 205, the concentration of gas and alarm condition all can show on liquid crystal display 205.
Simultaneously, the described monitor of present embodiment also comprises wired communication interface 206 and wireless communication interface 207, can result data be sent to information center by wired or wireless mode, is convenient to file and analyze.
At last, the tail gas that tests all enters high-precision T-valve and is aggregated into a gas circuit and is discharged into outside the monitor.
Need to prove that monitor adopts alternating current-direct current automatic switching mode power-supply system 208.
Adopt the alternating current 220V power supply under the online mode, in power supply, charge.
Use powered battery under the portable mode.The complete machine battery adopts lithium battery power supply, guarantees that normal and continuous operation is more than 10 hours under the instrument normal temperature.When battery capacity is lower than operating voltage, send corresponding prompt messages.In discharging and recharging design, design short circuit and polarity and connect safeguard measures such as anti-, increased the serviceable life and the reliability of battery.
AC power is taked external mode, need not to use under portable situation, by external, eliminate the power frequency of being brought by AC power and disturbs and solved heat dissipation problem when fixed installation.Wherein the lowering and stabilizing blood pressure module is selected the switching power supply module for use, and this module converts efficient height need not outer radiation fin, and output current is that 1A, output voltage are 5V, and the voltage stabilizing power supply of 5V is provided for digital circuit.
The monitor that present embodiment provides can be monitored the concentration of multiple gases simultaneously, because the mode that adopts galvanochemistry and infrared ray principle to combine can effectively be avoided the monitoring cross interference between each gas, makes monitoring result more accurate.And, adopt the sensor of above principle can make the volume of whole monitor become very little, realize portable.
Describe the monitoring of structures of pellet in the monitor below in detail.
Referring to Fig. 3, this figure is the structural drawing based on the monitoring of the utility model monitor pellet.
Need to prove that the difference of pellet monitoring channel and gas-monitoring passage only is cutter and detecting device.Wherein Temperature Humidity Sensor, microprocessor, wired and wireless communication interface, liquid crystal display and power-supply system and microprocessor are that two monitoring channels are shared.
At first, sampling pump 101 is with the described cutter 103a of air suction.
After cutter 103a removes airborne oversize grain, air is sent into detecting device 103b.
Need to prove that the cutter 103a of the monitor that present embodiment provides can change, the cutter of this monitor compatible PM10, PM5 or PM2.5 and overall suspended pellet (TSP, Total SuspendedParticulate) standard.
The concentration of detecting device 103b monitoring particle is the micro computer laser powder detecting device according to the band filter membrane on-line sampling device of light scattering principle design.
After air after removing oversize grain enters the darkroom of detecting device 103b, dust in the darkroom produces scattered light under laser radiation, receive and convert to the per minute that is directly proportional with scattered light intensity and dust concentration through forward direction and dash counting second, should dash second and be sent to microprocessor 104.
Referring to Fig. 4, this figure is the second example structure figure based on the utility model monitor.
Comprise gas-monitoring passage and particle monitoring passage among this figure.
Need to prove, during sampling pump 101 sampled air, simultaneously air is sent into particle monitoring passage, gas-monitoring passage and Temperature Humidity Sensor passage, promptly send into filtrator 102a, cutter 103a and Temperature Humidity Sensor 201.The humiture of Temperature Humidity Sensor 201 monitoring air sends humiture to microprocessor 104.Microprocessor 104 judges that described humiture is lower than when being scheduled to the humiture value, and sending controling instruction is to heater coil 204 and heater coil 304.
Wherein, heater coil 304 is arranged on the pipeline of particle monitoring passage.
Also connect between each parts of particle monitoring passage by connecting tracheae 303.
The data of particle monitoring also will carry out being sent to microprocessor 104 after the signal Processing through preposition discharge circuit module 202.
Follow-up data processing is identical with gas-monitoring, do not repeat them here, for example liquid crystal display data, send to other equipment etc. by wireless or wire communication mode.
Need to prove, also be provided with flow sensor after the described sampling pump, be used to monitor the flow of the air that sampling pump is drawn into, send described flow to described microprocessor; When the described flow of described microprocessor judges is below or above the preset flow rate value, the aperture of the screen of control setting after described flow sensor.
Need to prove that the utility model provides a kind of pellet monitor, identical among its specific implementation and the above-mentioned air quality monitoring instrument embodiment, do not repeat them here.
The utility model also provides a kind of gas monitoring instrument, and is identical among its specific implementation and the above-mentioned air quality monitoring instrument embodiment, do not repeat them here.
Need to prove that the air quality monitoring instrument that the utility model provides can be monitored the concentration of pellet and gas simultaneously, and the kind of particle and gas can combination in any.
The gas of monitoring can be selected arbitrarily in following 30 multiple gases, and combination in any:
Environmental monitoring gaseous species commonly used is: sulphuric dioxide, nitrogen dioxide, carbon monoxide, sulfuretted hydrogen, ozone, hydrogen fluoride.
Other optional gas is: carbon dioxide, ammonia, hydrogen cyanide, chlorine, hydrogen chloride,, fluorine gas, hydrogen, oxygen, nitrogen monoxide, bromine gas, hydrogen phosphide, uns-dimethylhydrazine, chlorine dioxide, hydrogen bromide, chloromethanes, vinyl chloride, phosgene, arsenic hydride, hydrogen peroxide, iodine gas, acid gas, arsonium, diborane, germane, hydrogen selenide, silane, oxirane, formaldehyde, toluene, ethanol, acetylene; Alkanes, hydro carbons, alcohols etc.
Below the simple using method of introducing the monitor that the utility model down provides.
Opening power at first, waiting system carries out self check to all hardware equipment and parameter, and when picture showed that self check finishes the non-fault prompting, the expression monitor was normal.
Can detect after monitor starts, by sampling pump and pipeline with the tested gas sampling in the surrounding environment to the air chamber of sensor, and affact on the different sensors in the sealed air chamber.
Each sensor is an exportable electric signal that is directly proportional with tested gas and inspirable particle concentration, sends electric signal to microprocessor and handles.
Microprocessor calculates the concentration of each gas and pellet, and demonstrates concentration value by display screen.Also can data be will detect and data transmission to information center data processing, secondary storage and printing carried out by wireless or wired mode by serial communication interface.
All data of monitor self storage can be checked whenever and wherever possible by the button of monitor self.
This monitor adopts battery monitoring circuit simultaneously, shows state of charge in real time, and has the undervoltage warning prompting.
The above only is preferred embodiment of the present utility model, is not the utility model is done any pro forma restriction.Though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model.Any those of ordinary skill in the art, do not breaking away under the technical solutions of the utility model scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solutions of the utility model are made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solutions of the utility model, all still belongs in the scope of technical solutions of the utility model protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present utility model.
Claims (13)
1, a kind of intelligent ambient air quality monitor is characterized in that, comprising: sampling pump, gas-monitoring passage, pellet monitoring channel and microprocessor;
Described pellet monitoring channel comprises: cutter and detecting device; Described sampling pump is used for pellet is drawn into described cutter; Described cutter is used for removing the oversize grain of described particle, sends into described detecting device; Described detecting device is used to produce the pulse that is directly proportional with particle concentration, with described pulse transmission to described microprocessor; Described microprocessor is used for being calculated by described pulsimeter the concentration of described particle;
Described gas-monitoring passage comprises: filtrator and at least two gas sensors; Described sampling pump is used for air is drawn into described filtrator; Described filtrator is used for sending into described gas sensor behind the impurity of filtered air and the moisture; Described gas sensor is used for producing and the proportional current signal of gas concentration, sends described current signal to described microprocessor; Described microprocessor is used for being calculated by described current signal the concentration of described gas.
2, monitor according to claim 1 is characterized in that, described gas sensor is an electrochemical sensor.
3, monitor according to claim 2 is characterized in that, also is provided with flow sensor after the described sampling pump, is used to monitor the flow of the air that sampling pump is drawn into, and sends described flow to described microprocessor; When the described flow of described microprocessor judges is below or above the preset flow rate value, the aperture of the screen of control setting after described flow sensor.
4, monitor according to claim 1 is characterized in that, also is provided with heater coil on the described sampling pump pipeline, also is provided with Temperature Humidity Sensor after the described filtrator;
Described Temperature Humidity Sensor is used to monitor the humiture of gas, sends described humiture to described microprocessor; The described humiture of described microprocessor judges is lower than when being scheduled to the humiture value, and sending controling instruction is to described heater coil, and described heater coil is described sampling pump pipeline heating.
5, monitor according to claim 1 is characterized in that, described gas sensor comprises infrared radiation source, measuring sonde and reference probe;
Tested gas enters air chamber, is provided with described infrared radiation source in the described air chamber; Described infrared radiation source is used to reflect gas in described measuring sonde with reference to probe; The filter that is covered with on the described measuring sonde is used for that section spectrum through the tested gas absorption of infrared spectrum; Described with reference to the filter that is covered with on the probe, be used for seeing through the non-absorbent spectrum of the tested gas of infrared spectrum; Described two probes are exported the level that an infrared light intensity that contacts with its surface is directly proportional separately; Described measuring sonde and the ratio of going up output level with reference to popping one's head in are used to calculate the concentration of tested gas.
6, monitor according to claim 5 is characterized in that, is provided with temperature sensor in the described probe or near the probe, is used for described infrared sensor is carried out temperature compensation.
7, monitor according to claim 1 is characterized in that, described cutter is PM10, PM5, PM2.5 or overall suspended pellet TSP type.
8, monitor according to claim 1 is characterized in that, described monitor also comprises liquid crystal display, is used to show gas and the related data of pellet and the duty of monitor of monitoring.
9, monitor according to claim 1 is characterized in that, the communication interface of described monitor comprises: wireless transmission interface, USB (universal serial bus), RS232 and/or RS485.
10, monitor according to claim 1 is characterized in that, described wireless transmission interface is GPRS or CDMA.
11, monitor according to claim 1 is characterized in that, the power supply of described monitor adopts AC power interface and the dual-purpose power-supply system of direct supply interface, is provided with electrical isolation and photoelectricity between described AC power interface and the extraneous power supply and isolates; Described direct supply interface directly connects battery.
12, a kind of pellet monitor is characterized in that, comprising: sampling pump, cutter, detecting device and microprocessor; Described sampling pump is used for pellet is drawn into described cutter; Described cutter after being used for removing the oversize grain of described particle, is sent into described detecting device; Described detecting device is used to produce the pulse that is directly proportional with particle concentration, with described pulse transmission to described microprocessor; Described microprocessor is used for being calculated by described pulsimeter the concentration of described particle.
13, a kind of gas monitoring instrument is characterized in that, comprising: sampling pump, filtrator, at least two gas sensors and microprocessor; Described sampling pump is used for air is drawn into described filtrator; Described filtrator is used for sending into described gas sensor behind the impurity of filtered air and the moisture; Described gas sensor is used for producing and the proportional current signal of gas concentration, sends described current signal to described microprocessor; Described microprocessor is used for being calculated by described current signal the concentration of described gas.
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