CN108267544A - Formaldehyde module caliberating device and its application method - Google Patents
Formaldehyde module caliberating device and its application method Download PDFInfo
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- CN108267544A CN108267544A CN201710006263.7A CN201710006263A CN108267544A CN 108267544 A CN108267544 A CN 108267544A CN 201710006263 A CN201710006263 A CN 201710006263A CN 108267544 A CN108267544 A CN 108267544A
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- formaldehyde
- methanol
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- volume
- formalin
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 951
- 238000000034 method Methods 0.000 title claims abstract description 29
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 448
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 73
- 230000035945 sensitivity Effects 0.000 claims description 25
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- COTNUBDHGSIOTA-UHFFFAOYSA-N meoh methanol Chemical compound OC.OC COTNUBDHGSIOTA-UHFFFAOYSA-N 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 3
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 229930040373 Paraformaldehyde Natural products 0.000 abstract description 10
- 229920002866 paraformaldehyde Polymers 0.000 abstract description 10
- 238000004445 quantitative analysis Methods 0.000 abstract description 4
- 235000019256 formaldehyde Nutrition 0.000 description 179
- 239000007789 gas Substances 0.000 description 94
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 9
- 239000000126 substance Substances 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 238000004448 titration Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000000205 computational method Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- BGJSXRVXTHVRSN-UHFFFAOYSA-N 1,3,5-trioxane Chemical compound C1OCOCO1 BGJSXRVXTHVRSN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- LDKDGDIWEUUXSH-UHFFFAOYSA-N Thymophthalein Chemical compound C1=C(O)C(C(C)C)=CC(C2(C3=CC=CC=C3C(=O)O2)C=2C(=CC(O)=C(C(C)C)C=2)C)=C1C LDKDGDIWEUUXSH-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- CUHVTYCUTYWQOR-UHFFFAOYSA-N formaldehyde Chemical compound O=C.O=C CUHVTYCUTYWQOR-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000520 microinjection Methods 0.000 description 1
- 125000005704 oxymethylene group Chemical group [H]C([H])([*:2])O[*:1] 0.000 description 1
- JOHZPMXAZQZXHR-UHFFFAOYSA-N pipemidic acid Chemical compound N1=C2N(CC)C=C(C(O)=O)C(=O)C2=CN=C1N1CCNCC1 JOHZPMXAZQZXHR-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
Abstract
The invention discloses a kind of caliberating devices of formaldehyde module, have the calibration box of an accommodating chamber；For the heating plate for evaporating the formalin solution of calibration rapidly, the heating plate is fixed in the accommodating chamber of calibration box；For formalin solution to be placed in the micro syringe on the heating plate；For ensureing the fan of formaldehyde gas uniformity in calibration box；At least one auxiliary circuit board, by connection in computer, the auxiliary circuit board is set in the accommodating chamber auxiliary circuit board；At least one formaldehyde module to be calibrated, the auxiliary circuit board are electrically connected with formaldehyde module.The present invention is demarcated using the quantitative method PARA FORMALDEHYDE PRILLS(91,95) module of the formaldehyde and methanol determined in volume volatility process and combination national standard, realize the cost effective and mass of formaldehyde module calibration, there is the formaldehyde gas concentration needed for generating that can follow one's bent, can realize selectivity calibration formaldehyde and can demarcate in batches.
Description
Technical field
The present invention relates to transducer calibration technical field, more specifically to a kind of formaldehyde module caliberating device.
Background technology
For the module producer and user, calibration simple and fast can be carried out to module is very important, this is just
It is required that we there will be accurate marked gas source, and the influence of other interference gas that may be present can be eliminated.At present
There are the calibration that 4 kinds of methods can carry out formaldehyde module, respectively gas bomb mixing method, volatility process, diffusion method and permeation tube method.
Gas bomb mixing method is that the formaldehyde gas and other inertia background gas that are contained with steel cylinder are mixed, to generate
Formaldehyde standard gas with certain concentration, then formaldehyde module to be calibrated is placed in the calibrating gas environment and is demarcated.
The disadvantages of this method is that formaldehyde gas is extremely unstable, can polymerize at any time, gas concentration is caused to change；In addition it is long-term
Storing a large amount of gases, there are security risks.
Permeation tube method is by the high polymer of formaldehyde --- metaformaldehyde is placed in osmos tube, and solid is allowed by controlling temperature
Metaformaldehyde, which is decomposed, generates formaldehyde vapor, and generated steam diffuses out from the tube wall of osmos tube and enters ring to be calibrated
In border.The disadvantages of this method one is that equipment is very expensive, is not suitable for medium-sized and small enterprises' buying；Second is that gas preparation time is very
It is long, it usually needs to be not suitable for production enterprise and carry out a large amount of continuous productions half a day to two days；Third, generated gas flow is non-
It is often few, it is suitable only for low concentration calibration.
Volatility process is that inert gas is passed through in certain density formalin, and formaldehyde gas is taken out of to be diffused into and waits to mark
Determine in environment.The disadvantages of this method is that accuracy is poor, and the concentration of gas occurs by temperature, used inert gas flow etc.
The influence of factor is very big；And the gas concentration generated is not known, and needs to re-scale.
Diffusion method is similar with osmosis, and difference part is in diffusion method it is that formalin solution is placed in diffuser to lead to
It crosses and controls certain temperature that liquid formaldehyde is allowed to be volatilized into gas and be in contact to form a certain concentration with carrier gas in the outlet of diffuser
Mixed gas.The disadvantages of this method is similar with osmosis, there is also the shortcomings of gas concentration occurred is low, and time of origin is long,
In addition to this accuracy of gas occurred is influenced by temperature very big, very high to the temperature control accuracy requirement of equipment.
The practicality of Intelligent Calibration system is acquired for a kind of multichannel formaldehyde application No. is CN201520080724.1, patent name
New patent is demarcated for PARA FORMALDEHYDE PRILLS(91,95) acquisition sensor, and disclosed calibration system uses formaldehyde standard gas bottle to formaldehyde
Formaldehyde standard gas in Calibration Box is provided, and the concentration of formaldehyde gas in formaldehyde Calibration Box is detected with PPM methylene oxide detecting instruments, according to
The concentration for the formaldehyde gas that PPM methylene oxide detecting instruments detect demarcates formaldehyde acquisition sensor to be calibrated.The system lacks
Point is to need formaldehyde standard gas bottle, PPM methylene oxide detecting instruments extremely related accessories, and system structure is complicated, of high cost；Formaldehyde gas
Highly unstable, concentration can be changed at any time due to polymerisation；Storing a large amount of gases for a long time, there are security risks；PPM
Methylene oxide detecting instrument can impact the accuracy of calibration result if there is failure.
Invention content
The technical problem to be solved by the present invention is to be directed to can not simply, accurately obtain in the prior art marked gas come
Source or the problems such as the influence of interference gas can not be eliminated, provide a kind of low cost, simple and practicable PARA FORMALDEHYDE PRILLS(91,95) module carries out
The device and its application method of calibration, can selectively demarcate formaldehyde and batch is demarcated.
In order to solve the above technical problems, technical solution provided by the invention is：
A kind of formaldehyde module caliberating device, including：
Calibration box with an accommodating chamber；
For the heating plate for evaporating the formalin solution of calibration rapidly, the heating plate is fixed on the appearance of calibration box
Receive intracavitary；
For formalin solution to be placed in the micro syringe on the heating plate；
For ensureing the fan of formaldehyde gas uniformity in calibration box；
At least one auxiliary circuit board, the auxiliary circuit board is by connection in computer, the auxiliary circuit board
It is set in the accommodating chamber；
At least one formaldehyde module to be calibrated, the auxiliary circuit board are electrically connected with formaldehyde module；The formaldehyde mould
Group is fixed in the accommodating chamber of the calibration box.
Further, the formaldehyde module includes formaldehyde sensor and mould-group circuit-board, the formaldehyde sensor and module
It is electrically connected between circuit board；Mould-group circuit-board is electrically connected with the auxiliary circuit board.
Further, the auxiliary circuit board is electrically connected with multiple formaldehyde modules.
Further, the auxiliary circuit board in the calibration box has multiple.
Further, the calibration box side is provided at least one injection port, and the micro syringe passes through injection port
Formalin solution is placed on the heating plate, the injection port is equipped with sealing cover.
Further, the fan has multiple.
A kind of formaldehyde module scaling method, this method are as follows：
S1：It is v to calculate formaldehyde module detection volumeMethanol volumeMethanol caused by net electric signal Δ VMethanol：ΔVMethanol=VMethanol-
V0；
S2：The volume is obtained as vMethanol volumeMethanol be added to calibration box caused by methanol gas concentration CMethanol, meter
Calculate sensitivity S of the formaldehyde module to methanolMethanol：
SMethanol=Δ VMethanol/CMethanol；
S3：The methanol gas in calibration box is replaced with pure air, and ensures that the output voltage of formaldehyde module restores to stablize；
S4：It is v ' to volume to calculate formaldehyde moduleFormalin volumeFormalin solution caused by net electric signal：
ΔV′Formalin=V 'Formalin-V0′；
S5：The volume is obtained as v 'Formalin volumeThe gas that is generated of formalin solution in formaldehyde concentration CFormaldehydeWith
Concentration C described in S2Methanol；Calculate formaldehyde module electric signal as caused by formaldehyde：
ΔVFormaldehyde=Δ V 'Formalin-CMethanol·SMethanol；
S6：Calculate the sensitivity of formaldehyde module detection formaldehyde：
SFormaldehyde=Δ VFormaldehyde/CFormaldehyde；
S7：Calculate relative sensitivity of the formaldehyde module detection methanol relative to formaldehyde：
S%=SMethanol/SFormaldehyde100%；
S8：The gas summation of formaldehyde in the formalin solution and methanol is converted into the concentration of pure formaldehyde, claimed
For formaldehyde equivalent concentration CAlways：
CAlways=CFormaldehyde+CMethanolS%
S9：By the formaldehyde equivalent concentration CAlwaysComputer is sent to demarcate formaldehyde module.
Further, the step S1 is specially：
1：Obtain output voltage values V of the formaldehyde module in pure air0；
2：It is v to measure volume by micro syringeMethanol volumeMethanol, methanol is added on heating plate, and open fan with
Ensure the uniformity of methanol gas in calibration box；
3：It is v to obtain formaldehyde module and detect the volumeMethanol volumePure methanol output electric signal
VMethanol；
4：It is v to calculate formaldehyde module and detect the volumeMethanol volumePure methanol caused by net electric signal Δ VMethanol：ΔVMethanol
=VMethanol-V0。
Further, the step S4 is specially：
1：The initial output voltage for obtaining formaldehyde module is recorded as V0′；
2：Volume v ' is measured with micro syringeFormalin volumeFormalin solution, solution is added on heating plate, open
Fan records the voltage value V ' of formaldehyde module output to ensure the uniformity of gas in calibration boxFormalin；
3：Calculate electric signal net caused by formaldehyde module：
ΔV′Formalin=V 'Formalin-V0′。
Further, C in the step S5MethanolComputational methods it is as follows：
Calculating volume is v 'Formalin volumeFormalin solution in the content of contained formaldehyde and methanol, and calculate by
The concentration C of formaldehyde in the gas that the formalin solution of the volume is generated after being added in calibration boxFormaldehydeIt is dense with methanol
Spend CMethanol。
Beneficial effects of the present invention：
Formaldehyde module caliberating device of the present invention is using the formaldehyde and methanol determined in volume volatility process and combination national standard
Quantitative method PARA FORMALDEHYDE PRILLS(91,95) module is demarcated, and can obtain concentration accurately and reliably formaldehyde standard gas, solve bottled first
Aldehyde calibrating gas is unstable and osmosis can not carry out the problem of batch is demarcated, and realizes the low cost of formaldehyde caliberating device
Change, there is the formaldehyde gas concentration needed for generating that can follow one's bent, can realize selectivity calibration formaldehyde and can realize
The advantages that batch is demarcated.
Description of the drawings
Fig. 1 is the structure diagram of one preferred embodiment of formaldehyde module caliberating device of the present invention；
Fig. 2 is the internal structure schematic diagram of one preferred embodiment of formaldehyde module caliberating device of the present invention；
Fig. 3 is the structure diagram of formaldehyde module of the present invention.
Reference numeral includes：
1- demarcates box 2- heating plate 3- fans
4- auxiliary circuit board 5- computer 6- injection ports
7- micro syringe 8- sealing cover 9- formaldehyde modules
91- formaldehyde sensor 92- mould-group circuit-boards
Specific embodiment
The present invention is described in detail below in conjunction with attached drawing.
For the module producer and user, calibration simple and fast can be carried out to module is very important, this is just
It is required that we there will be accurate marked gas source, and the influence of other interference gas that may be present can be eliminated.To reach
To above-mentioned purpose, the present invention obtains the Standard Gases of certain concentration in 9 calibration process of formaldehyde module using volume volatility process is determined
Body is described in detail below：
A kind of formaldehyde module caliberating device, including calibration box 1, heating plate 2, fan 3, auxiliary circuit board 4 and computer 5.
Demarcating box 1 has an accommodating chamber, good airproof performance, and volume fixes and it is known that in the present embodiment, during calibration box 1 is
Empty rectangular box facilitates and calculates its volume.The side of calibration box 1 is provided at least one injection port 6, and injection port 6 is installed
There is sealing cover 8, for injecting the formalin solution of certain volume into calibration box 1.
In the present embodiment, demarcate in 1 accommodating chamber of box and heating plate 2 is installed, the micro syringe 7 crossed with accurate quantitative analysis measures
Solution by injection port 6 is slowly added dropwise on heating plate 2, makes formalin solution fast by the formalin solution of certain volume
Speed is volatilized into calibration mixed gas used.Injection port 6 and sealing cover 8 prevent mixed gas from being spread out from calibration box 1.
It in the present embodiment, demarcates in box 1 and at least one fan 3 is installed, for ensureing that the gas in calibration box 1 uniformly divides
Cloth.
Demarcate inside the accommodating chamber of box 1 and be additionally provided at least one auxiliary circuit board 4, auxiliary circuit board 4 with it is at least one
Formaldehyde module 9 to be calibrated is electrically connected, and can be that formaldehyde module 9 is powered, and as terminal and be installed on computer 5
Calibration software is connected.One auxiliary circuit board 4 can be connect with multiple formaldehyde modules 9, in one embodiment, an auxiliary
Circuit board 4 is connect with 10 formaldehyde modules 9, and each formaldehyde module 9 has corresponding serial number, can also be set in calibration box 1 more
A auxiliary circuit board 4, to realize that batch is demarcated.In one embodiment of the invention, formaldehyde module 9 can be set to position
Plate, convenient for being positioned to formaldehyde module 9 and reference numerals.
Formaldehyde module 9 is made of formaldehyde module 91 and mould-group circuit-board 92, formaldehyde sensor 91 and mould-group circuit-board 92 it
Between be electrically connected, mould-group circuit-board 92 is electrically connected with auxiliary circuit board 4.Formaldehyde module 9 is fixed on the accommodating chamber of calibration box 1
Interior, in the presence of having formaldehyde gas in environment, the formaldehyde module 9 can be catalyzed formaldehyde gas and generate certain electric signal, module
Circuit board 92 can detect the electric signal, store it in from carrying space, be worked as receiving by what calibration software reception and registration came
During content of formaldehyde gas in preceding calibration environment, the sensitivity of formaldehyde module 9 is calculated by the instruction of calibration software, draws and demarcates
Curve is simultaneously stored in from carrying space；Collected electric signal is converted into concentration value in real time simultaneously, to realize formaldehyde module 9
Calibration.
Collected electric signal is uploaded to the mark being installed on computer 5 by mould-group circuit-board 92 by auxiliary circuit board 4
Determine software, if formaldehyde module 9 has multiple, auxiliary circuit board 4 successively uploads electric signal according to 9 corresponding serial number of formaldehyde module
To the calibration software being installed on computer 5.
Calibration software can be calculated in the formaldehyde 9 corresponding electric signal of module for receiving different serial numbers according to preset
Journey demarcates each formaldehyde module 9, and writes the result into the included memory of mould-group circuit-board 4.
Since the volume of calibration box 1 is that the content of formaldehyde and methanol is also one in certain, added formalin solution
Fixed, so the equivalent concentration of the formaldehyde gas obtained is also fixed, it is readily available certain density formaldehyde Standard Gases
Body does not need to the equipment of additional detection formaldehyde gas concentration or storage formaldehyde standard gas.It and can be according to micro-injection
The volume of formalin solution in device 7 adjusts required formaldehyde gas concentration, uses simple and convenient.
Generally use formalin solution in calibration process, that is, the formalin that content of formaldehyde is 37~40%.
Formalin solution be configured during in order to prevent oxymethylene polymerization be usually added into a certain amount of methanol prevent polymerization (referring to
National standard GB/T685-1993), the methanol content added in is 15~20%, and the methanol content added in each batch with
And content of formaldehyde is all different, it is necessary to can just be used after strictly being quantified to it.Since most of formaldehyde modules 9 do not have
The performance of selective enumeration method, that is, formaldehyde module 9 can also detect methanol other than it can detect formaldehyde.With the present apparatus
It when PARA FORMALDEHYDE PRILLS(91,95) module 9 is demarcated, demarcates mixed gas used and includes formaldehyde gas and methanol gas, therefore, in calibration
Need first to be calculated the relative sensitivity of each 9 methanol PARA FORMALDEHYDE PRILLS(91,95) of formaldehyde module, then in calibration mixed gas used
Methanol be converted into formaldehyde by above-mentioned relative sensitivity, obtain formaldehyde equivalent concentration, then demarcated, circular is such as
Under：
(1) in formalin solution content of formaldehyde calculating
National standard GB/T685-1993《Chemical reagent formalin solution》4.1 define formaldehyde in formalin solution and contain
The assay method of amount, concrete operation step are as follows：50mL sodium sulfite solutions (126g/L) are measured, are placed in 250mL conical flasks,
Add 3 drop thymolphthalein indicator solutions (1g/L), with sulfuric acid standard titration solution [c (1/2H2SO4)=1mol/L] be titrated to it is colourless.
3.2g (3mL) formalin solution sample is weighed, 0.0001g is accurate to, is placed in above-mentioned solution, is shaken up with sulfuric acid standardized titration
Solution [c (1/2H2SO4)=1mol/L] it is titrated to solution and is become colorless by blue.It can obtain in formalin solution, formaldehyde
Mass percentage, use XFormaldehydeIt represents.
Content of formaldehyde is calculated as follows：
XFormaldehyde=v × C × 0.03003/m × 100
XFormaldehydeThe percentage composition of formaldehyde；
V- samples consume the volume of sulfuric acid standard titration solution；
The concentration of C- sulfuric acid standard titration solutions；
0.03003- and 1.00mL sulfuric acid standard titration solution [c (1/2H2SO4)=1.000mol/L] it is comparable, with a gram table
The quality of the formaldehyde shown；
The quality of m- formalin solution samples.
(2) in formalin solution methanol content calculating
According to above formula, the exact level of formaldehyde in formalin solution used is accurately determined, referring to national standard
GB/T685-1993 and GB/T611-1988 carrys out the methanol concentration in solution used in accurate quantitative analysis.First, according to national standard GB/
T611-1988《Chemical reagent density measurement universal method》5.1 density for determining formalin solution, are represented, then root with ρ
According to national standard GB/T685-1993《Chemical reagent formalin solution》, the density p by formalin solution and the regulation by 4.1
The percentage composition X of the formaldehyde measuredFormaldehyde, the A1 that tables look-up obtains the content of methanol in formalin solution, uses XMethanolIt represents.
(3) calculating of concentration of formaldehyde in mixed gas used is demarcated
Due to the volume v ' for the formalin solution that micro syringe 7 measuresFormalin volumeWith the volume V of calibration box 1Demarcate boxAll
It is known, it is known that the percentage composition X of formaldehyde in the density p and formalin solution of formalin solutionFormaldehyde, can calculate
When formalin solution is volatilized into gas, the concentration of formaldehyde in the mixed gas used in obtained calibration.With micro syringe 7
The volume of a certain amount of formalin solution is weighed, is denoted as v 'Formalin volume, formalin solution is had been obtained in above-mentioned (1)
The content X of middle formaldehydeFormaldehyde, volume can be calculated as v 'Formalin volumeThe quality of middle formaldehyde is v 'Formalin volumeρXFormaldehyde, obtain formaldehyde
Relative molecular mass MFormaldehyde, volume can be calculated as v 'Formalin volumeThe amount n of the substance of middle formaldehyde is v 'Formalin volumeρXFormaldehyde/MFormaldehyde,
Due to substance, the amount of substance remains unchanged under gaseous state and liquid, further according to The Ideal-Gas Equation, you can is calculated often
Normal temperature and pressure lower volume is v 'Formalin volume, formaldehyde content XFormaldehydeVolume of formalin solution when being volatilized into formaldehyde gas be
v′Formalin volumeρXFormaldehydeRT/MFormaldehydeP obtains the volume V of calibration box 1Demarcate box, calculate in the mixed gas that calibration is used in calibration box 1
The concentration C of formaldehydeFormaldehyde。
The concentration of formaldehyde is calculated as follows in calibration mixed gas used：
CFormaldehyde=v 'Formalin volumeρXFormaldehydeRT/MFormaldehydePVDemarcate box
CFormaldehydeThe concentration of formaldehyde in calibration mixed gas used；
v′Formalin volumeThe volume for the formalin solution that micro syringe 7 weighs；
The density of ρ-formalin solution；
XFormaldehydeThe content of formaldehyde in formalin solution；
MFormaldehydeThe relative molecular mass of formaldehyde；
R- ideal gas constants；
T- room temperature；
P- normal pressures；
VDemarcate boxDemarcate the volume of box 1.
Wherein, the value of R is about 8.3145, and room temperature T usually takes 298K, normal pressure p to take 101325pa, MFormaldehydeIt is 30.
(4) calculating of methanol concentration in mixed gas used is demarcated
Methanol concentration refers under normal temperature and pressure in mixed gas, formalin solution volatilization pure methanol gas volume with
The ratio of the volume of box 1 is demarcated, computational methods are demarcated with described in the calculating of concentration of formaldehyde in (3) calibration mixed gas used
The concentration of methanol is calculated as follows in mixed gas used：
CMethanol=v 'Formalin volumeρXMethanolRT/MMethanolPVDemarcate box
CMethanolThe concentration of methanol in calibration mixed gas used；
v′Formalin volumeThe volume for the formalin solution that micro syringe 7 weighs；
The density of ρ-formalin solution；
XMethanolThe content of methanol in formalin solution；
MMethanolThe relative molecular mass of methanol；
R- ideal gas constants；
T- room temperature；
P- normal pressures；
VDemarcate boxDemarcate the volume of box 1.
Wherein, the value of R is about 8.3145, and room temperature T usually takes 298K, normal pressure p to take 101325pa, MFormaldehydeIt is 32.
(5) formaldehyde module 9 is to the measure of methanol sensitivity
There is the methanol standard substance of certain concentration on sale on the market at present, such as purity is up to 99.9% liquid first
Alcohol, its density p under room temperature ' it is 0.791g/mL.So in calibration, we, which first calibrate, carrys out formaldehyde module 9 to the sensitive of methanol
Degree.Accurately weigh vMethanol volumeMethanol, according to the density p of methanol ', volume can be calculated as vMethanol volumeMethanol quality m=
vMethanol volumeρ′.It is v by volumeMethanol volumeMethanol micro syringe 7 be placed on heating plate 2, calibration box 1 in volatilize.It obtains
Take the relative molecular mass M of methanolMethanol, you can volume is calculated as vMethanol volumeMethanol in methanol substance amount vMethanol volumeρ′/
MMethanol, since the amount of substance of the substance under gaseous state and liquid remains unchanged, further according to The Ideal-Gas Equation, you can calculate
Volume is obtained as vMethanol volumeMethanol, at normal temperatures and pressures, volume when being volatilized into methanol gas is vMethanol volumeρ′RT/MMethanolP is obtained
Take the volume V of calibration box 1Demarcate box, calculate the concentration W for demarcating methanol gas in box 1Methanol=vMethanol volumeρ′RT/MMethanolp VDemarcate box。
Formaldehyde module 9 is opened, formaldehyde module 9 is made to be detected the methanol gas in calibration box 1, formaldehyde module 9 is existed
Net electric signal is denoted as Δ V caused by during detection methanol gasMethanol, formaldehyde module 9 counts the sensitivity of methanol as the following formula
It calculates：
SMethanol=Δ VMethanol/WMethanol
By WMethanolIt brings into above formula, sensitivity S of the formaldehyde module 9 to methanol can be obtainedMethanol：
SMethanol=Δ VMethanol·MMethanol·p·VDemarcate box/(vMethanol volume·ρ′·R·T)。
SMethanolSensitivity of the formaldehyde module 9 to methanol；
P- normal pressures；
VDemarcate boxDemarcate the volume of box 1；
The density of ρ '-methanol；
R- ideal gas constants；
T- room temperature.
(6) calculating of formaldehyde sensitivity
Again by formaldehyde module 9 to formaldehyde in the response of mixed gas and the mixed gas being derived above and methanol
Content can obtain the sensitivity of sensor PARA FORMALDEHYDE PRILLS(91,95), use SFormaldehydeIt represents, for details, reference can be made to the following formula：
SFormaldehyde=(Δ V 'Formalin-CMethanol·SMethanol)/CFormaldehyde
SFormaldehydeThe sensitivity of 9 PARA FORMALDEHYDE PRILLS(91,95) of formaldehyde module；
ΔV′FormalinThe net electric signal caused by formaldehyde module 9 during formalin solution is demarcated；
CMethanolThe concentration of methanol in calibration mixed gas used；
SMethanolSensitivity of the formaldehyde module 9 to methanol；
CFormaldehydeThe concentration of formaldehyde in calibration mixed gas used.
(7) formaldehyde module 9 calculates the relative sensitivity of methanol
The relative sensitivity of methanol can be calculated as follows in formaldehyde module 9：
S%=SMethanol/SFormaldehyde100%；
S%- formaldehyde module 9 is to the relative sensitivity of methanol；
SMethanolSensitivity of the formaldehyde module 9 to methanol；
SFormaldehydeThe sensitivity of 9 PARA FORMALDEHYDE PRILLS(91,95) of formaldehyde module.
So even with same middle formalin solution, each formaldehyde module 9 is different to the relative sensitivity of methanol, needs
Relative sensitivity of each formaldehyde module 9 to methanol is obtained one by one.
(8) the centinormal 1 calculating of formaldehyde
Since 9 PARA FORMALDEHYDE PRILLS(91,95) of formaldehyde module and methanol have response, so a concentration of formaldehyde and first that formaldehyde module 9 detects
The concentration of alcohol mixed gas, by the concentration conversion of methanol into formaldehyde equivalent concentration, formaldehyde equivalent concentration is calculated as follows the present invention：
CAlways=CFormaldehyde+CMethanolS%
CAlwaysCalibration mixed gas formaldehyde equivalent concentration used；
CFormaldehydeThe concentration of formaldehyde in calibration mixed gas used；
CMethanolThe concentration of methanol in calibration mixed gas used；
S%- formaldehyde module 9 is to the relative sensitivity of methanol.
The scaling method of formaldehyde module caliberating device of the present invention, is as follows：
S1：Obtain output voltage values V of the formaldehyde module (9) in pure air0；Body is measured by micro syringe (7)
Product is vMethanol volumeMethanol, pure methanol is added on heating plate (2), and open fan (3) with ensure demarcate box (1) interior methanol gas
The uniformity of body；It is v to obtain formaldehyde module (9) and detect the volumeMethanol volumeMethanol output electric signal VMethanol；Calculate formaldehyde mould
It is v that group (9), which detects the volume,Methanol volumeMethanol caused by net electric signal Δ VMethanol：ΔVMethanol=VMethanol-V0。
S2：The volume is obtained as vMethanol volumePure methanol be added to the concentration of methanol gas caused by calibration box (1)
CMethanol, calculate sensitivity S of the formaldehyde module (9) to methanolMethanol：
SMethanol=Δ VMethanol/CMethanol。
S3：The methanol gas in calibration box is replaced with pure air, and ensures that the output voltage of formaldehyde module (9) restores steady
It is fixed.
S4：The initial output voltage for obtaining formaldehyde module (9) is recorded as V0′；Volume is measured with micro syringe (7)
v′Formalin volumeFormalin solution, solution is added on heating plate (2), open fan (3) with ensure demarcate box (1) interior gas
Uniformity, and record formaldehyde module (9) output voltage value V 'Formalin；Calculate telecommunications net caused by formaldehyde module (9)
Number：
ΔV′Formalin=V 'Formalin-V0′。
S5：Calculating volume is v 'Formalin volumeFormalin solution in the content of contained formaldehyde and methanol, and calculate
Go out the concentration C of formaldehyde in the gas generated after the formalin solution of the volume is added in calibration box (1)FormaldehydeWith
The concentration C of methanolMethanol, and calculate formaldehyde module (9) electric signal as caused by formaldehyde：
ΔVFormaldehyde=Δ V 'Formalin-CMethanol·SMethanol；
S6：Calculate the sensitivity that formaldehyde module (9) detects formaldehyde：
SFormaldehyde=Δ VFormaldehyde/CFormaldehyde；
S7：It calculates formaldehyde module (9) and detects relative sensitivity of the methanol relative to formaldehyde：
S%=SMethanol/SFormaldehyde100%；
S8：The gas summation of formaldehyde in the formalin solution and methanol is converted into the concentration of pure formaldehyde, claimed
For formaldehyde equivalent concentration CAlways：
CAlways=CFormaldehyde+CMethanolS%
S9：By the formaldehyde equivalent concentration CAlwaysComputer (5) is sent to demarcate formaldehyde module (9).
More than content is only presently preferred embodiments of the present invention, for those of ordinary skill in the art, according to the present invention
Thought, in specific embodiments and applications can be with many changes may be made, as long as these variations are without departing from the structure of the present invention
Think, all belong to the scope of protection of the present invention.
Claims (10)
1. a kind of formaldehyde module caliberating device, which is characterized in that including：
Calibration box (1) with an accommodating chamber；
For the heating plate (2) for evaporating the formalin solution of calibration rapidly, the heating plate (2) is fixed on calibration box
(1) in accommodating chamber；
For formalin solution to be placed in the micro syringe (7) on the heating plate (2)；
For ensureing the fan (3) of calibration box (1) interior formaldehyde gas uniformity；
At least one auxiliary circuit board (4), the auxiliary circuit board (4) is by connection in computer (5), the auxiliary electricity
Road plate (4) is set in the accommodating chamber；
At least one formaldehyde module (9) to be calibrated, the auxiliary circuit board (4) are electrically connected with formaldehyde module (9)；The first
Aldehyde module (9) is fixed in the accommodating chamber of the calibration box (1).
2. a kind of formaldehyde module caliberating device according to claim 1, which is characterized in that the formaldehyde module (9) includes
Formaldehyde sensor (91) and mould-group circuit-board (92) electrically connect between the formaldehyde sensor (91) and mould-group circuit-board (92)
It connects；Mould-group circuit-board (92) is electrically connected with the auxiliary circuit board (4).
3. a kind of formaldehyde module caliberating device according to claim 2, which is characterized in that the auxiliary circuit board (4) with
Multiple formaldehyde modules (9) are electrically connected.
4. a kind of formaldehyde module caliberating device according to claim 3, which is characterized in that auxiliary in the calibration box (1)
Circuit board (4) is helped to have multiple.
5. a kind of formaldehyde module caliberating device according to claim 4, which is characterized in that described calibration box (1) side is set
At least one injection port (6) is equipped with, formalin solution is placed in described add by the micro syringe (7) by injection port (6)
On backing (2), the injection port (6) is equipped with sealing cover (8).
6. a kind of formaldehyde module caliberating device according to claim 5, which is characterized in that the fan (3) has multiple.
7. a kind of formaldehyde module scaling method is provided such as claim 1-6 any one of them formaldehyde module caliberating devices, spy
Sign is that this method is as follows：
S1：It is v to calculate formaldehyde module (9) and detect volumeMethanol volumeMethanol caused by net electric signal
ΔVMethanol∶ΔVMethanol=VMethanol-V0；
S2：The volume is obtained as vMethanol volumeMethanol be added to the concentration C of methanol gas caused by calibration box (1)Methanol, calculate
Formaldehyde module (9) is to the sensitivity S of methanolMethanol：
SMethanol=Δ VMethanol/CMethanol；
S3：The methanol gas in calibration box is replaced with pure air, and ensures that the output voltage of formaldehyde module (9) restores to stablize；
S4：It is v ' to volume to calculate formaldehyde module (9)Formalin volumeFormalin solution caused by net electric signal：
ΔV′Formalin=V 'Formalin-V0′；
S5：The volume is obtained as v 'Formalin volumeThe gas that is generated of formalin solution in formaldehyde concentration CFormaldehydeIn S2
The concentration CMethanol；Calculate formaldehyde module (9) electric signal as caused by formaldehyde：
ΔVFormaldehyde=Δ V 'Formalin-CMethanol·SMethanol；
S6：Calculate the sensitivity that formaldehyde module (9) detects formaldehyde：
SFormaldehyde=Δ VFormaldehyde/CFormaldehyde；
S7：It calculates formaldehyde module (9) and detects relative sensitivity of the methanol relative to formaldehyde：
S%=SMethanol/SFormaldehyde100%；
S8：The gas summation of formaldehyde in the formalin solution and methanol is converted into the concentration of pure formaldehyde, referred to as first
Aldehyde equivalent concentration CAlways：
CAlways=CFormaldehyde+CMethanolS%
S9：By the formaldehyde equivalent concentration CAlwaysComputer (5) is sent to demarcate formaldehyde module (9).
8. a kind of formaldehyde module scaling method according to claim 7, which is characterized in that the step S1 is specially：
1：Obtain output voltage values V of the formaldehyde module (9) in pure air0；
2：It is v to measure volume by micro syringe (7)Methanol volumeMethanol, methanol is added on heating plate (2), and open fan
(3) with ensure demarcate box (1) interior methanol gas uniformity；
3：It is v to obtain formaldehyde module (9) and detect the volumeMethanol volumePure methanol output electric signal VMethanol；
4：It is v to calculate formaldehyde module (9) and detect the volumeMethanol volumePure methanol caused by net electric signal Δ VMethanol∶ΔVMethanol=
VMethanol-V0。
9. a kind of formaldehyde module scaling method according to claim 8, which is characterized in that the step S4 is specially：
1：The initial output voltage for obtaining formaldehyde module (9) is recorded as V0′；
2：Volume v ' is measured with micro syringe (7)Formalin volumeFormalin solution, solution is added on heating plate (2), is beaten
(3) are opened fan to ensure the uniformity of calibration box (1) interior gas, and record the voltage value V ' of formaldehyde module (9) outputFormalin；
3：Calculate electric signal net caused by formaldehyde module (9)：
ΔV′Formalin=V 'Formalin-V0′。
A kind of 10. formaldehyde module scaling method according to claim 9, which is characterized in that C in the step S5MethanolMeter
Calculation method is as follows：
Calculating volume is v 'Formalin volumeFormalin solution in the content of contained formaldehyde and methanol, and calculate will be described
The concentration C of formaldehyde in the gas that the formalin solution of volume is generated after being added in calibration box (1)FormaldehydeIt is dense with methanol
Spend CMethanol。
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| CN112505260A (en) * | 2020-12-23 | 2021-03-16 | 南京工程学院 | Formaldehyde removal effect evaluation device |
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