CN109508049A - The bottled calibrating gas preparation method that gas test uses - Google Patents
The bottled calibrating gas preparation method that gas test uses Download PDFInfo
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- CN109508049A CN109508049A CN201811284200.9A CN201811284200A CN109508049A CN 109508049 A CN109508049 A CN 109508049A CN 201811284200 A CN201811284200 A CN 201811284200A CN 109508049 A CN109508049 A CN 109508049A
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- Prior art keywords
- gas
- concentration
- calibrating
- temperature
- controller
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
Abstract
The present invention relates to the bottled calibrating gas preparation method that a kind of gas test uses, high concentrations of gas and air are passed through into two gas mass flow controllers respectively controls to enter after two kinds of gas flows and be sufficiently mixed area；Controller is according to the required demand for matching various concentration, output control signal controls two gas mass flow controllers, it adjusts two kinds of gases and enters the gas volume ratio for being sufficiently mixed area, mixed gas concentration is acquired by the gas analyzer being placed in temperature and humidity case, acquisition signal feeds back to controller, after controller compares concentration difference, adjust two gas mass flow controller control amounts, until the gas concentration that gas analyzer detects is equal to setting concentration, the mixed gas for reaching setting concentration enters calibrating gas bottle, calibrating gas bottle and gas analyzer are under same temperature and humidity box temperature damp condition, the calibrating gas obtained under this temperature and humidity conditions is demarcated for gas detector.Cost is relatively low, control is simple, easy to maintain.
Description
Technical field
The present invention relates to a kind of gas technology of preparing, in particular to prepared by the bottled calibrating gas that a kind of gas test uses
Method.
Background technique
Environmental test in national standard in many gas detector examination criterias all includes that high and low temperature is tested, is constant wet
Heat test.Gas used in elementary error is tested when environmental test and is generally bottled calibrating gas, and tests domestic gas detection
Bottled standard gas distributing is difficult to reach test concentration when device, on the market some indoor formaldehyde gas detector accuracy grades
Not Shen Zhidadao 1ppm, and the precision of present calibrating gas itself cannot reach so high progress, many for spy
Survey the detection of device.
Currently on the market there are no can complete gas detector hot test, low-temperature test, steady-state damp heat test it is same
When dynamic air-distributing (low concentration) system, and in two kinds of modeling schemes of general extreme environment, using " being realized in cavity extremely low
Heat-insulated when warm environment " scheme, refrigeration can be difficult to realize；Explosion-proof cost mistake can be made using " placing cavity in extreme environment " scheme
It is high.
Summary of the invention
The present invention be directed to be difficult to the problem of allotting light concentration gas using bottled calibrating gas when environmental test, propose
A kind of bottled calibrating gas preparation method that gas test uses, the low cost for realizing that distribution and environmental test carry out simultaneously fill
It sets.
The technical solution of the present invention is as follows: the bottled calibrating gas preparation method that a kind of gas test uses, including two gas
Weight flow controller, controller, gas mixing zone, temperature and humidity case, valve, gas analyzer and standard configuration sample test bottle, will
High concentrations of gas and air pass through first gas mass flow controller and second gas mass flow controller control two respectively
Enter after kind gas flow and is sufficiently mixed area；Demand of the controller according to required proportion various concentration, output control signal
Two gas mass flow controllers are controlled, two kinds of gases is adjusted and enters the gas volume ratio for being sufficiently mixed area, be sufficiently mixed area
Gas, which is stablized to open after mixing, is sufficiently mixed the first valve on area's output channel, by pipeline where the first valve by affiliated matched proportion density
Gas be sent into the gas analyzer that is placed in temperature and humidity case, gas analyzer output gas under temperature and humidity box temperature damp condition
Concentration feedback returns controller, after this concentration is compared by controller with setting concentration, adjusts two gas mass flow controls
Device control amount, until the gas concentration that gas analyzer detects is equal to the first valve is closed after concentration is arranged, opening is sufficiently mixed
The second valve on area's output channel on another way pipeline, the mixed gas for reaching setting concentration enter calibrating gas bottle, Standard Gases
Body bottle and gas analyzer are under same temperature and humidity box temperature damp condition, obtain the calibrating gas under this temperature and humidity conditions, are tied
Beam preparation, turns off the second valve.
Calibration mask is housed, when detection, in calibration mask, calibrating gas and under test gas are detected on the calibrating gas bottleneck
Device probe comes into full contact with, and carries out gas detector calibration.
The beneficial effects of the present invention are: the bottled calibrating gas preparation method that gas test of the present invention uses, it can be in height
Low concentration distribution is carried out while low temperature, damp heat test, cost is relatively low, control is simple, easy to maintain.
Detailed description of the invention
Fig. 1 is the bottled calibrating gas preparation system schematic diagram that gas test of the present invention uses.
Specific embodiment
The bottled calibrating gas preparation system schematic diagram that gas test as shown in Figure 1 uses, high concentrations of gas is (such as highly concentrated
Degree methane) and diluent gas (such as air) be synthetically prepared the calibrating gas methane of (such as (0~100%LEL)) of required concentration.
High concentration methane and air are passed through into gas mass flow controller 1 respectively and gas mass flow controller 2 is controlled
It makes to enter after two kinds of gas flows and is sufficiently mixed area.Two gas mass flow controller flow signals are provided by controller, control
Demand of the device processed according to required proportion various concentration, output control signal two gas mass flow controllers of control, tune
Whole two kinds of gas enters the gas volume ratio for being sufficiently mixed area, after the output of two controllers is stablized, illustrates that adjustment control terminates,
It is sufficiently mixed area's gas and stablizes to open after mixing and be sufficiently mixed area's output channel upper valve 1, by 1 place pipeline of valve by affiliated proportion
The gas of concentration is sent into the gas analyzer being placed in temperature and humidity case, and gas analyzer precision is higher than under test gas detector, gas
Body analyzer output gas concentration under temperature and humidity box temperature damp condition feeds back to controller, and controller is dense by this concentration and setting
After degree is compared, two gas mass flow controller control amounts are adjusted, until the gas concentration that gas analyzer detects
Equal to setting concentration.Valve 1 is closed, the valve 2 being sufficiently mixed on area's output channel on another way pipeline is opened, reaches setting concentration
Mixed gas enters calibrating gas bottle, and calibrating gas bottle and gas analyzer are under same temperature and humidity box temperature damp condition, obtain
Calibrating gas under this temperature and humidity conditions terminates preparation, turns off valve 1 and 2.Equipped with mark on standard gas bottle mouth when detection
Fixed cover, in calibration mask, calibrating gas comes into full contact with under test gas detector probe, carries out gas detector calibration.
The proportion that various concentration can be realized by two gas mass flow controllers, passes through the tune of temperature and humidity box temperature humidity
It is whole that each test environmental requirement can be achieved.
Claims (2)
1. the bottled calibrating gas preparation method that a kind of gas test uses, which is characterized in that including two gas mass flows
Controller, controller, gas mixing zone, temperature and humidity case, valve, gas analyzer and standard configuration sample test bottle, by high concentrations of gas
Pass through first gas mass flow controller respectively with air and second gas mass flow controller controls two kinds of gas flows
Enter afterwards and is sufficiently mixed area；Demand of the controller according to required proportion various concentration, output control signal two gas of control
Weight flow controller adjusts two kinds of gases and enters the gas volume ratio for being sufficiently mixed area, and it is stable mixed to be sufficiently mixed area's gas
It is opened after conjunction and is sufficiently mixed the first valve on area's output channel, be sent into the gas of affiliated matched proportion density by pipeline where the first valve
The gas analyzer being placed in temperature and humidity case, gas analyzer output gas concentration under temperature and humidity box temperature damp condition are fed back to
Controller adjusts two gas mass flow controller control amounts, directly after this concentration is compared by controller with setting concentration
The gas concentration detected to gas analyzer closes the first valve after being equal to setting concentration, and opening is sufficiently mixed on area's output channel
The second valve on another way pipeline, the mixed gas for reaching setting concentration enter calibrating gas bottle, calibrating gas bottle and gas point
Analyzer is under same temperature and humidity box temperature damp condition, obtains the calibrating gas under this temperature and humidity conditions, terminates preparation, turns off the
Two valves.
2. the bottled calibrating gas preparation method that gas test uses according to claim 1, which is characterized in that the standard
Calibration mask is housed on gas bottleneck, when detection, in calibration mask, calibrating gas comes into full contact with under test gas detector probe,
Carry out gas detector calibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811284200.9A CN109508049A (en) | 2018-10-31 | 2018-10-31 | The bottled calibrating gas preparation method that gas test uses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811284200.9A CN109508049A (en) | 2018-10-31 | 2018-10-31 | The bottled calibrating gas preparation method that gas test uses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109508049A true CN109508049A (en) | 2019-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811284200.9A Pending CN109508049A (en) | 2018-10-31 | 2018-10-31 | The bottled calibrating gas preparation method that gas test uses |
Country Status (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112191117A (en) * | 2020-09-21 | 2021-01-08 | 上海仪器仪表自控系统检验测试所有限公司 | Blending device and blending method for multiple combustible gases |
| CN112540149A (en) * | 2019-09-20 | 2021-03-23 | 中国石油化工股份有限公司 | Gas generating device and method |
| CN113805616A (en) * | 2021-09-30 | 2021-12-17 | 深圳市科曼医疗设备有限公司 | Gas concentration adjusting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540149A (en) * | 2019-09-20 | 2021-03-23 | 中国石油化工股份有限公司 | Gas generating device and method |
| CN112191117A (en) * | 2020-09-21 | 2021-01-08 | 上海仪器仪表自控系统检验测试所有限公司 | Blending device and blending method for multiple combustible gases |
| CN113805616A (en) * | 2021-09-30 | 2021-12-17 | 深圳市科曼医疗设备有限公司 | Gas concentration adjusting device |
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Application publication date: 20190322 |