CN1916599A - Apparatus for calibrating gas detector in site, and method of gas distribution - Google Patents
Apparatus for calibrating gas detector in site, and method of gas distribution Download PDFInfo
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- CN1916599A CN1916599A CN 200510086246 CN200510086246A CN1916599A CN 1916599 A CN1916599 A CN 1916599A CN 200510086246 CN200510086246 CN 200510086246 CN 200510086246 A CN200510086246 A CN 200510086246A CN 1916599 A CN1916599 A CN 1916599A
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Abstract
An on-site calibrator of gas detector consists of a gas bottle for storing high pressure gas, a pressure stabilizing valve connected with gas bottle through gas tube, a covered container, a high-speed quantitative solenoid valve for sending said gas to covered container, a microprocessor connected to high-speed quantitative solenoid valve and a power supply module for supplying power on said processor and said solenoid valve.
Description
Technical field
The present invention relates to the simple and easy compound method of the mixed gas of two or more component gas, more particularly a kind of apparatus for calibrating gas detector in site and air distributing method for the certain density mixed gas design of preparation.
Background technology
The key component of apparatus for calibrating gas detector in site is the combination gas generating portion, and the preparation of mixed gas (being called for short " distribution ") method is a lot, and that mainly uses has following 5 kinds:
Static volume distribution method: the percentage concentration that refers to certain each component gas of mixed gas that need are joined is converted into the respectively volume of this gas, in full each component gas is injected a mixing container (as leather bag) under normal pressure, is compressed into gas cylinder after calibrating.This method is simple, accurate, but the preparation of inapplicable a large amount of gases;
Weighing distribution method: the concentration conversion that refers to certain each component gas of mixed gas that need are joined becomes the respectively weight of this gas, in full accurately claims to such an extent that respectively fill people's gas cylinder gas weight on precision balance with a gas cylinder.This generally is only limited to little gas cylinder preparation.This method is not acted upon by temperature changes, and joins to such an extent that gas concentration is accurate, often is used to the preparation of " standard gas sample ".But complicated operation; Require very high;
Flow distribution method: refer to each component concentrations of certain mixed gas of joining as required, regulate in the air distributing device the respectively quantitative bore of this gas, the Control Flow ratio carries out continuous distribution (claiming " automatic distributing " again).Air distributing device mainly contains throughput ratio regulating system and an oxygen concentration proportion regulating system continuously.This method is easy to use, can prepare use continuously, but the mixed gas concentration of preparation has certain error;
Pressure distribution (composition is press-fitted gas again) method: according to dalton's law of partial pressure, the percentage concentration of certain mixed gas that need are joined is converted into the partial pressure value of each component gas, charges into the method for air pressure in full to a gas cylinder by the rain glass of precision.This method is simple and easy to do, and is practical, but is subjected to the influence of factors such as temperature, pressure variation, and the accuracy of its concentration is poor than said method;
Osmosis is a kind of dynamic air-distributing method, utilizes the component gas in the osmos tube to be penetrated in the carrier gas by a suitable permeable membrane, thereby forms combination gas.Can the lower gas of configuration concentration, but the preservation of osmos tube needs lower temperature, in use need carry out thermostatic bath.
Machinery or the instrument of using above method formation also have a variety of, as the gas ratio pump, the distributing instrument that the service property (quality) flow controller is formed, use distributing instrument of high precision suspended body flowmeter or the like, if these distributing instruments carry out on-site proving to combustible gas probe and toxic gas alarm at present, in use exist a lot of problems, as:
Volume, weight are big, move inconvenience, demarcate for frequent mobile room and place and have any problem;
Price height, general distributing instrument price are all several ten thousand even tens0000, and extravagent price is unfavorable for popularizing and promoting;
Require certain setup time, as preheating, thermal equilibrium etc.;
The component atmospheric pressure there is requirement;
Power consumption is bigger, generally is Alternating Current Power Supply;
Can not arbitrarily change component gas, changing component gas need calibrate again.
Owing to have above situation, adopt following several method to solve the on-site proving problem of detector at present:
The method of substitution, to rock gas, liquefied gas, using gases lighter, solid alcohol etc. carry out on-the-spot qualitative demarcation.This kind method can only be qualitative can not be quantitative, and can not actual response detector operation state.With methane is example, the national Specification alarm concentration value is at 500-12500ppm, but the use lighter carries out timing signal, and its gas of emitting is isobutane, discharge liquid condition from lighter and become gaseous state under the normal pressure, directly enter detector, the gas concentration that gas sensor is experienced may reach hundreds of thousands ppm, far surpasses lower explosive limit 50,000 ppm, the detector that under this condition, can report to the police, when real generation is leaked, can not guarantee its effective warning, lead to a disaster.
Standard gas method, it is fixed to return emblem mark, pulls down from the scene that detector is installed, and return-to-factory uses standard gas at the scene, demarcates with the mode of calibration cover, and the shortcoming of this method is to cost an arm and a leg, and need carry heavy gas bomb.And can not decide and measurement at the enterprising rower of a plurality of concentration point, be not suitable for a large amount of detector on-site provings.Be example still with methane (rock gas), generally only carry 500ppm with this kind method, the standard gas of two kinds of concentration of 12500ppm judges whether detector does not report to the police at low side when using 500ppm, when 12500ppmm, whether report to the police, but that real alarm set point can not be judged is clear;
Again demarcate in the laboratory that the demarcation condition is arranged, this method cost is higher, the time is long, and makes monitored system be in the outer state of monitoring, influences safety.
Summary of the invention
The object of the present invention is to provide a kind of apparatus for calibrating gas detector in site and air distributing method, can the on-the-spot distribution of simple and convenient realization, gas alarm to be demarcated, volume is small and exquisite, battery-powered, the high-pressure mini gas cylinder provides component gas, and can adapt to various ingredients gas, cheap.
To achieve these goals, the invention provides a kind of apparatus for calibrating gas detector in site, wherein, comprising:
One gas cylinder stores the high pressure component gas;
One gas pressure maintaining valve links to each other with described gas cylinder by gas transmission line;
One cover body container;
One high-speed quantitative solenoid valve is connected with described gas pressure maintaining valve by gas transmission line, and transmits described component gas to described cover body container;
One microprocessor system is used to control described high-speed quantitative solenoid valve; And
One supply module is to described microprocessor and high-speed quantitative solenoid valve.
Above-mentioned apparatus for calibrating gas detector in site wherein, also comprises:
An one pressure detection module and a temperature detecting module are connected with described microprocessor system respectively;
Described pressure detection module comprises a pressure transducer, is arranged in the gas transmission line between described gas pressure maintaining valve and the high-speed quantitative solenoid valve;
Described temperature detecting module comprises a temperature sensor, is arranged in the gas transmission line between described gas pressure maintaining valve and the high-speed quantitative solenoid valve.
Above-mentioned apparatus for calibrating gas detector in site, wherein, described microprocessor system comprises:
One high-speed quantitative solenoid-driven module is electrically connected with described high-speed quantitative solenoid valve; And
One microprocessor sends high-speed quantitative solenoid control parameter to described high-speed quantitative solenoid-driven module;
Described pressure detection module is connected with the A/D switched pins of described microprocessor respectively with temperature detecting module.
Above-mentioned apparatus for calibrating gas detector in site wherein, also comprises:
One exhaust fan is used to stir component gas in the described cover body container, obtains electric power supply from described supply module;
One exhaust fan driver module is according to the described exhaust fan of the instruction control of described microprocessor.
Above-mentioned apparatus for calibrating gas detector in site wherein, also comprises:
One battery voltage detection module is electrically connected described supply module and described microprocessor.
Above-mentioned apparatus for calibrating gas detector in site, wherein, the bottom of described cover body container is provided with a telescopic connecting link.
In order better to realize above-mentioned purpose, the present invention also provides a kind of air distributing method of apparatus for calibrating gas detector in site, wherein, may further comprise the steps:
Step 1 discharges the component gas in the gas cylinder;
Step 3, microprocessor calculates and controls the switching number of times of quantitative solenoid valve;
Step 4, quantitatively solenoid valve is carried out the switch motion of described switching number of times, described component gas is input in the cover body container forms detected gas.
The air distributing method of above-mentioned apparatus for calibrating gas detector in site wherein, also comprises after the step 4:
Step 5 utilizes the exhaust fan that is arranged at described cover body container that gas is stirred.
The air distributing method of above-mentioned apparatus for calibrating gas detector in site, wherein, described step 3 specifically comprises:
Step 31, microprocessor are calculated the valve parameter of described quantitative solenoid valve;
Step 32, microprocessor is according to the switching number of times of the described quantitative solenoid valve of volume calculation of described valve parameter, described detected gas required concentration, described cover body volume of a container and detected gas detector;
Step 33, microprocessor is controlled described quantitative solenoid valve according to the switching number of times of described quantitative solenoid valve.
The air distributing method of above-mentioned apparatus for calibrating gas detector in site, wherein, described step 31 specifically may further comprise the steps:
Step 311, a pressure detection module detects the pressure parameter of the gas that obtains in the described step 2;
Step 312, a temperature detecting module detects the temperature parameter of the gas that obtains in the described step 2;
Step 313, microprocessor are calculated the valve parameter of described quantitative solenoid valve according to pressure parameter, temperature parameter that described step 311 and step 312 obtain in conjunction with the kind of described component gas.
The air distributing method of above-mentioned apparatus for calibrating gas detector in site wherein, also comprises before the described step 1:
Step 7 is calibrated described apparatus for calibrating gas detector in site.
The air distributing method of above-mentioned apparatus for calibrating gas detector in site, wherein, described step 7 specifically comprises:
Step 71 links to each other described cover body container respectively with air intake opening by the gas outlet of air intake opening with gas outlet and infrared gas analyzer;
Step 72 starts described infrared spectrum analyser, makes gas and described infrared spectrum analyser in the described cover body container form circulation, and zero point is regulated in the stable back of described infrared spectrum analyser;
Step 73 makes to form certain density mixed gas in the described cover body container, treats that described gas links to each other respectively with air intake opening at mouth;
Step 72 starts described infrared spectrum analyser, makes gas and described infrared spectrum analyser in the described cover body container form circulation, and zero point is regulated in the stable back of described infrared spectrum analyser;
Step 73, make and form certain density mixed gas in the described cover body container, treat that described gas mixes in described cover body container after, read in the gas concentration value that infrared spectrum analyser shows, the concentration value of setting with described apparatus for calibrating gas detector in site compares, if the concentration value that described infrared spectrum analyser shows is greater than the concentration value of described setting, then reduce to respond the coefficient of gas, if the concentration value that described infrared spectrum analyser shows is less than the concentration value of described setting then increase the coefficient of described response gas, it is consistent with the concentration value of described setting to adjust the concentration value that shows up to described infrared spectrum analyser repeatedly.
Apparatus for calibrating gas detector in site of the present invention reduces pressure through reduction valve by the high pressure component gas that gas cylinder provides, through the gas pressure maintaining valve pressure stability is arrived certain value again, again by pressure transducer detected gas pressure, utilize temperature sensor detected gas temperature, this parameter is input in the microprocessor by analog to digital converter, according to user's needs concentration, through calculating time and the number of times that the back quantitative solenoid valve of decision opens and closes, the component gas of certain volume is injected in the container, detector is put into combination gas, warning whether the detected gas alarm expects under this specific concentrations and corresponding action, thus it is carried out the detection of validity.This marking apparatus volume is small and exquisite, battery-powered, the high-pressure mini gas cylinder provides component gas, and can adapt to various ingredients gas, and power consumption is little, cheap.
Description of drawings
Fig. 1 is an apparatus for calibrating gas detector in site one-piece construction synoptic diagram of the present invention;
Fig. 2 is the main machine structure synoptic diagram of apparatus for calibrating gas detector in site of the present invention;
Fig. 3 is the cover body containment system structural representation of apparatus for calibrating gas detector in site of the present invention;
Fig. 4 is the circuit module connection diagram of apparatus for calibrating gas detector in site of the present invention;
Fig. 5 is the microprocessor pin synoptic diagram of apparatus for calibrating gas detector in site of the present invention;
Fig. 6 a is respectively 14 volts of voltage generations of apparatus for calibrating gas detector in site of the present invention and Voltage stabilizing module, the generation of 5V voltage and Voltage stabilizing module, news Chinese percussion instrument module, exhaust fan driver module, the quantitative electrical block diagram of solenoid-driven module, battery voltage detection module, temperature detecting module and pressure detection module to Fig. 6 h.
Embodiment
The fixed 10ml gas that approximately consumes calculates one bottle of gas with this and approximately can demarcate 2000 above gas alarms.And gas cylinder 12 itself has reduction valve No. one time, and top hole pressure 0.5Mpa also comprises a rain glass between the 0.8Mpa, indication gas cylinder internal pressure.
In conjunction with illustrated in figures 1 and 2, main frame 11 mainly is made up of control circuit board 110, display screen 111, keyboard 112, various interface 113, gas pressure maintaining valve 114 and battery modules (not shown).Apparatus for calibrating gas detector in site of the present invention can also comprise a battery charger simultaneously, can charge to the battery modules of apparatus for calibrating gas detector in site, after apparatus for calibrating gas detector in site is full of electricity, can use 48 hours, the marked gas alarm is more than 400 continuously.
Also a fan 115 can be set in main frame 11 simultaneously, be used for the heat radiation of the microprocessor of main frame, can disperse the component gas of leakage simultaneously.
Wherein gas pressure maintaining valve 114 links to each other with gas cylinder 12 by pipeline, makes the gaseous tension by gas cylinder 12 inputs be stabilized to certain value, and guarantees that in use the gaseous tension of output remains unchanged, and is controlled among the present invention about 30Kpa;
As shown in Figure 3, cover body system 13 comprises:
Cover body container 131 is used for the confining gas alarm, holds the gas that is used to demarcate simultaneously;
Cover body covers (not shown), has air inlet and give vent to anger to connect mouth, is used for the calibration of marking apparatus, can not carry in actual use;
High-speed quantitative solenoid valve 132 is arranged at cover body container 131, and control enters the volume of the marked gas of cover body container 131;
The exhaust fan (not shown) is arranged at the bottom of cover body container 131, is used to stir the marked gas that enters cover body container 131, and marked gas is mixed;
Gas connection pipe line 134 is connected in the gas vent and the high-speed quantitative solenoid valve of main frame 11, transmits marked gas to the cover body container; And
Control circuit of the present invention connects block diagram as shown in Figure 4, mainly comprises following main modular:
Microprocessor module: the present invention uses the 8051 kernel enhancement mode single-chip microcomputers of the model of Philips company production as P89LPC935, and it has the additional ram in slice of Flash program storage, 256 byte RAM data-carrier stores and 512 bytes of 16kB byte-erasable.User data EEPROM memory block in 512 chunks can be used to deposit the device sequence code and parameter etc. is set.8 A/D converters of 24 tunnel inputs/DAC output.This single-chip microcomputer is the core of apparatus for calibrating gas detector in site of the present invention, finishes calculating, control and demonstration task, and concrete pin as shown in Figure 5.
Display module: the interface that the user exchanges, be connected with microprocessor, use 128 * 64 dot pattern display modules, pixel 0.28 * 0.35mm, whole demonstration is fine and smooth, and menu and information are used Chinese, can show 4 * 8 of 16 * 16 dot matrix Chinese characters altogether, display control chip DS1250, for EL backlight, can easy manipulation than dark situation.
14 volts of voltages generate and Voltage stabilizing module: the present invention provides 6V voltage to 7V by rechargeable battery set, but the quantitative solenoid valve adhesive of present embodiment and exhaust fan need of work 14V voltage, this just need carry out boosting inverter, the max1771 boosted switch controller chip that the present invention uses MAXIM to produce, switching frequency 300KHz, peripheral cell seldom, can produce 14V voltage, 1A is provided electric current, physical circuit is shown in Fig. 6 a, simultaneously in order to prolong the service time of battery, 12 volts of voltage generates and Voltage stabilizing module is only just worked when quantitatively solenoid valve adhesive and exhaust fan rotate, other times make it be in dormant state by microprocessor module, and consumed power seldom.The present invention uses five joint NiH rechargeable batteries, every batteries capacity 4Ah, about 100mA electric current during work.The battery output current reaches 1A during solenoid valve work, but each measurement of duration is no more than 15 seconds;
5V voltage generates and Voltage stabilizing module: in the present embodiment, intrasystem most of device all needs to be operated in 5V, and the voltage of rechargeable battery set is along with changing service time, change between the 6.8V about 5.5V greatly, therefore the present invention uses the linear voltage stabilization integrated circuit of the low pressure reduction of LM2940 that voltage is stabilized in 5.0V, circuit structure is shown in Fig. 6 b, and the electric capacity in the circuit plays burning voltage and moves back the lotus root effect;
News Chinese percussion instrument module: use 5V to yowl, by microprocessor module control, the prompting that is used to sound, as button prompting, electric weight is not enough points out, point out in the distribution etc., its physical circuit is shown in Fig. 6 c.
The exhaust fan driver module: exhaust fan uses 14V direct current supply, and axial flow blower is controlled its switch by microprocessor module, opens 12 seconds during each distribution, and component gas and air mixed is even, and its physical circuit is shown in Fig. 6 d.
Quantitative solenoid-driven module: quantitatively the driving circuit of solenoid valve requires drive current big, and response speed is fast, and the operating current of solenoid valve needs 0.5A approximately, and it is big that the rising edge of electric current and the negative edge gradient are wanted, and opens and closes rapidly with the assurance solenoid valve.Quantitatively the switching of solenoid valve is controlled by microprocessor module, and quantitatively solenoid-driven module physical circuit is shown in Fig. 6 e.
Battery voltage detection module: shown in Fig. 6 f, cell voltage is through the negative terminal of dividing potential drop input comparator, 2.5V reference voltage source input comparator anode, when cell voltage is lower than 5.3V, the comparer output low level, this voltage signal input microprocessor module, and by news Chinese percussion instrument module prompting user battery electric quantity deficiency.
Temperature detecting module: the viscosity of gas is subjected to gas temperature and pressure influence, therefore needs to measure the temperature of using gases.Temperature sensor uses the thermistor (NTC) of negative temperature coefficient, as temperature-sensing element (device), thermistor is placed in the pipeline of gas stream warp, in real time the detected gas temperature.Thermistor is selected 25 ℃/100k for use, is its resistance 100k at temperature 25 degree, 0 294.2k when spending, and 40 56k when spending, highly sensitive, output signal can be without the A/D switched pins of amplifying direct input microprocessor module, and physical circuit is shown in Fig. 6 g.
The pressure detection module: the gas that discharges from gas cylinder through the gas pressure maintaining valve after, pressure stability is at certain value, in order to prevent the pressure maintaining valve pressure surge, the working pressure sensor carries out pressure monitoring.The 24 serial pressure transducers that pressure transducer selects for use honeywell company to produce, concrete model is 24PCB, pressure limit 0-5psi, gauge pressure.The input of 10V voltage, output is electric bridge difference 0-50mv, and this voltage amplifies 50 times through instrument amplifier AD623, and the A/D switched pins of input microprocessor module is carried out analog to digital conversion, and physical circuit is shown in Fig. 6 h;
Keyboard, the interface of the keyboard person of being to use operating instrument has four buttons and is respectively: mode key, measure key, compensation key, aligning key, give an order to microprocessor module.
The critical component of apparatus for calibrating gas detector in site of the present invention is the high-speed quantitative solenoid valve, in most preferred embodiment, select the 34B-ABA-GDNA-1BA type solenoid valve of U.S. MAC company for use, it is fast that this solenoid valve opens and closes reaction velocity, the time of the solenoid valve of at every turn opening is certain, time set utilizes the number of times of opening solenoid valve to control the volume of the component gases of discharge at 10ms.
Suppose cover body vessel volume V, each solenoid valve is opened the gas volume β (to call valve parameter in the following text) of discharge, needs the mixture strength P of configuration, and solenoid valve opens and closes times N, then:
P＝(N*β)/(V+N*β)
When N* β＜＜during V, following formula can be write as:
P＝(N*β)/V
The gas concentration P required according to the detected gas detector can calculate solenoid valve action frequency N, is shown below:
N＝(P*V)/β
Valve parameter β is not a fixed value, and it changes along with the variation of temperature and pressure, and under the constant situation of time aperture, valve parameter is the function of temperature and pressure.
At first, be the relation that example is determined gaseous tension and valve parameter with methane, at normal temperature 25 degree,, carry out least square method then and return, the quadratic polynomial function that to draw a pressure K be variable by measuring the valve parameter of gas with various pressure:
β
1＝aK
2+bK+c
a＝-0.3574
b＝85.5330
c＝983.9044
For remaining gas hydrogen, propane, carbon monoxide, do identical demarcation respectively, draw a each other respectively, b, c coefficient.
And then the relation of definite temperature and β, under the situation of gaseous tension K=30Kpa,, measure the valve parameter under the different temperatures by changing temperature gradually, draw the proportional relation of temperature T and β:
β=β
1* (1+ (T-10) * 0.072); Wherein
Wherein T is degree centigrade, and 10 ℃ of temperature correction scopes--40 ℃, α is a gas factor, and in order to other deviations that compensation occurs, scope is 0.8-1.2.
10 ℃ of temperature--in 40 ℃ of scopes, the temperature compensation of all gases can be thought identical, all uses following formula.
Valve parameter is in case determine that open solenoid valve, if the time is certain, then the gas volume of Pai Chuing is only relevant with temperature, gaseous tension and gaseous species at every turn.When gaseous species is determined, by pressure maintaining valve, gaseous tension is kept certain, utilize the temperature sensor measurement gas temperature that valve parameter is necessarily compensated, can realize the distribution concentration consistance under the different temperatures.
Apparatus for calibrating gas detector in site of the present invention in use, press and measure key selection gaseous species, after mode key selection marked gas concentration, the high pressure component gas that gas cylinder provides is after the reduction valve decompression of gas cylinder self, through the gas pressure maintaining valve pressure stability is arrived certain value again, by pressure transducer detected gas pressure, utilize temperature sensor detected gas temperature, the temperature and pressure parameter is input in the microprocessor module by analog to digital converter, mixture strength according to user's needs, through calculating time and the number of times that the back quantitative solenoid valve of decision opens and closes, the last quantitative solenoid valve of microprocessor module, the component gas of certain volume is injected in the container, stir through fan, form certain density combination gas, detector is put into combination gas, warning whether the detected gas alarm expects under this specific concentrations and corresponding action, thus it is carried out the detection of validity.
When measuring, selected gas mode is improper, be that the blending ingredients gas concentration is improper, can not make detector produce the action of expection, then press the compensation key, at this moment sampling valve starts once more, in the cover body container, append the gas that injects selected concentration pattern 1/10, make the gas concentration in the cover body container raise 1/10, and start exhaust fan 4 seconds, fully mixed gas.
Various parameters all are kept among the EEPROM, when apparatus for calibrating gas detector in site starts, can read the value and the assignment of each parameter and carry out corresponding calculated to variable from EEPROM.
Yet apparatus for calibrating gas detector in site of the present invention in use for some time, in order to keep its distribution precision, need calibrate it, and calibration needs the infrared gas analyzer of heap component air-sensitive sense, and Calibration Method specifically comprises the steps:
Step 1 connects distribution cover and the lid of giving as an addition, and the air intake opening on the lid is given vent to anger by the air inlet of tracheae and infrared gas analyzer with the gas outlet to link to each other;
Step 3, the beginning distribution, measurement key by marking apparatus begins distribution, make and form certain density mixed gas in the cover body container, treat that gas mixes in the cover body container after, read in the gas concentration value that infrared spectrum analyser shows, the concentration value of setting with marking apparatus compares, if the concentration value that infrared spectrum analyser shows is greater than the concentration value of setting, in marking apparatus calibration menu, reduce to respond the coefficient of gas, if the concentration value that described infrared spectrum analyser shows is less than the concentration value of described setting then increase the coefficient of described response gas, it is consistent with the concentration value of described setting to adjust the concentration value that shows up to described infrared spectrum analyser repeatedly;
After each distribution is finished, read in the concentration value of infrared spectrum analyser,, the combination gas in the container emitted if distribution again then needs the cover body container cover is opened, up to infrared spectrum analyser till the zero point.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (12)
1, a kind of apparatus for calibrating gas detector in site is characterized in that, comprising:
One gas cylinder stores the high pressure component gas;
One gas pressure maintaining valve links to each other with described gas cylinder by gas transmission line;
One cover body container;
One high-speed quantitative solenoid valve is connected with described gas pressure maintaining valve by gas transmission line, and transmits described component gas to described cover body container;
One microprocessor system is used to control described high-speed quantitative solenoid valve; And
One supply module is to described microprocessor and high-speed quantitative solenoid valve.
2, apparatus for calibrating gas detector in site according to claim 1 is characterized in that, also comprises:
An one pressure detection module and a temperature detecting module are connected with described microprocessor system respectively;
Described pressure detection module comprises a pressure transducer, is arranged in the gas transmission line between described gas pressure maintaining valve and the high-speed quantitative solenoid valve;
Described temperature detecting module comprises a temperature sensor, is arranged in the gas transmission line between described gas pressure maintaining valve and the high-speed quantitative solenoid valve.
3, apparatus for calibrating gas detector in site according to claim 2 is characterized in that, described microprocessor system comprises:
One high-speed quantitative solenoid-driven module is electrically connected with described high-speed quantitative solenoid valve; And
One microprocessor sends high-speed quantitative solenoid control parameter to described high-speed quantitative solenoid-driven module;
Described pressure detection module is connected with the A/D switched pins of described microprocessor respectively with temperature detecting module.
4, apparatus for calibrating gas detector in site according to claim 3 is characterized in that, also comprises:
One exhaust fan is used to stir component gas in the described cover body container, obtains electric power supply from described supply module;
One exhaust fan driver module is according to the described exhaust fan of the instruction control of described microprocessor.
5, apparatus for calibrating gas detector in site according to claim 3 is characterized in that, also comprises:
One battery voltage detection module is electrically connected described supply module and described microprocessor.
According to claim 1,2,3 or 4 described apparatus for calibrating gas detector in site, it is characterized in that 6, the bottom of described cover body container is provided with a telescopic connecting link.
7, a kind of air distributing method of apparatus for calibrating gas detector in site is characterized in that, may further comprise the steps:
Step 1 discharges the component gas in the gas cylinder;
Step 2 outputs to quantitative solenoid valve after the gas that described gas cylinder is discharged is stabilized in a force value;
Step 3, microprocessor calculates and controls the switching number of times of quantitative solenoid valve;
Step 4, quantitatively solenoid valve is carried out the switch motion of described switching number of times, described component gas is input in the cover body container forms detected gas.
8, the air distributing method of apparatus for calibrating gas detector in site according to claim 7 is characterized in that, also comprises after the step 4:
Step 5 utilizes the exhaust fan that is arranged at described cover body container that gas is stirred.
According to the air distributing method of claim 7 or 8 described apparatus for calibrating gas detector in site, it is characterized in that 9, described step 3 specifically comprises:
Step 31, microprocessor are calculated the valve parameter of described quantitative solenoid valve;
Step 32, microprocessor is according to the switching number of times of the described quantitative solenoid valve of volume calculation of described valve parameter, described detected gas required concentration, described cover body volume of a container and detected gas detector;
Step 33, microprocessor is controlled described quantitative solenoid valve according to the switching number of times of described quantitative solenoid valve.
10, the air distributing method of apparatus for calibrating gas detector in site according to claim 9 is characterized in that, described step 31 specifically may further comprise the steps:
Step 311, a pressure detection module detects the pressure parameter of the gas that obtains in the described step 2;
Step 312, a temperature detecting module detects the temperature parameter of the gas that obtains in the described step 2;
Step 313, microprocessor are calculated the valve parameter of described quantitative solenoid valve according to pressure parameter, temperature parameter that described step 311 and step 312 obtain in conjunction with the kind of described component gas.
11, the air distributing method of apparatus for calibrating gas detector in site according to claim 7 is characterized in that, also comprises before the described step 1:
Step 7 is calibrated described apparatus for calibrating gas detector in site.
12, the air distributing method of apparatus for calibrating gas detector in site according to claim 11 is characterized in that, described step 7 specifically comprises:
Step 71 links to each other described cover body container respectively with air intake opening by the gas outlet of air intake opening with gas outlet and infrared gas analyzer;
Step 72 starts described infrared spectrum analyser, makes gas and described infrared spectrum analyser in the described cover body container form circulation, and zero point is regulated in the stable back of described infrared spectrum analyser;
Step 73, make and form certain density mixed gas in the described cover body container, treat that described gas mixes in described cover body container after, read in the gas concentration value that infrared spectrum analyser shows, the concentration value of setting with described apparatus for calibrating gas detector in site compares, if the concentration value that described infrared spectrum analyser shows is greater than the concentration value of described setting, then reduce to respond the coefficient of gas, if the concentration value that described infrared spectrum analyser shows is less than the concentration value of described setting then increase the coefficient of described response gas, it is consistent with the concentration value of described setting to adjust the concentration value that shows up to described infrared spectrum analyser repeatedly.
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| CN2005100862466A CN1916599B (en) | 2005-08-18 | 2005-08-18 | Apparatus for calibrating gas detector in site, and method of gas distribution |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042484A (en) * | 2009-10-16 | 2011-05-04 | 北京均方理化科技研究所 | Normal-pressure and room-temperature dynamic gas distribution system and gas distribution method thereof |
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| US5205322A (en) * | 1992-06-17 | 1993-04-27 | Puritan-Bennett Corporation | Method and apparatus for flow control for sensor calibration |
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| CN2910342Y (en) * | 2005-08-19 | 2007-06-13 | 北京均方理化科技研究所 | In-situ gage instrument of gas detector |
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2005
- 2005-08-18 CN CN2005100862466A patent/CN1916599B/en not_active Expired - Fee Related
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