CN201926602U - Simple propionic acid gas detection device - Google Patents
Simple propionic acid gas detection device Download PDFInfo
- Publication number
- CN201926602U CN201926602U CN2011200147741U CN201120014774U CN201926602U CN 201926602 U CN201926602 U CN 201926602U CN 2011200147741 U CN2011200147741 U CN 2011200147741U CN 201120014774 U CN201120014774 U CN 201120014774U CN 201926602 U CN201926602 U CN 201926602U
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- Prior art keywords
- propionic acid
- acid gas
- quartz crystal
- crystal sensor
- bottle
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model discloses a simple propionic acid gas detection device, which is characterized in that two gas inlet pipes (1 and 2) are combined into one pipe which penetrates through a drying pipe (5) and then enters the bottom of a detection bottle (10), the detection bottle (10) is sealed by a rubber plug (8), a quartz crystal sensor (6) and a gas outlet pipe (9) are inserted into the rubber plug (8), a sensitive film coating material which is coated on the quartz crystal sensor (6) is benzo-18-crown-6, the benzo-18-crown-6 can high-sensitively and high-selectively absorb propionic acid gas molecules through a supermolecule effect, the quartz crystal sensor (6) is connected with an oscillating circuit (11), and the oscillating circuit (11) is driven by a direct current power supply (12) and is connected with a frequency counter (13) to form a complete sensing detection loop. The simple propionic acid gas detection device is simple and convenient to manufacture, can accurately and rapidly detect the concentration of propionic acid gas in ambient air and can be used for online monitoring.
Description
Technical field
The utility model relates to a kind of easy propionic acid (CH
3CH
2COOH) gas sensing pick-up unit, this device can detect the concentration of propionic acid gas in the ambient atmosphere accurately and rapidly, and can be used for on-line monitoring.
Background technology
Propionic acid is one of the main poisonous air pollutants in resident living area and commercial production district, its high concentration steam has the strong impulse effect to eyes, skin and the mucous membrane of humans and animals, respiratory tract and gastrointestinal system etc. there is serious corrosive attack, can causes diseases such as stomachache, pharyngitis, bronchitis and pulmonary edema.The propionic acid gas Cmax that is allowed in U.S. Occupational Safety and Health Administration (OSHA) the regulation air is 10ppm (30mg/m
3), therefore the sensitivity monitoring to propionic acid in the ambient atmosphere has crucial meaning.The assay method of propionic acid mainly contains acid base titration, the chromatography of ions, high performance liquid chromatography, capillary electrophoresis, absorption spectrophotometry and fluorometry etc. at present, these methods are because operation link is many, waste time and energy, be unsuitable for the concentration of on-line monitoring propionic acid gas, therefore a kind of low cost, easy and simple to handle need be found, and the apparatus of accurate fast measuring propionic acid gas concentration can be reached.
The utility model content
Technical problem to be solved in the utility model provides a kind of easy propionic acid gas-detecting device, this device be easy to the preparation, easy to operate, can use repeatedly, the concentration of propionic acid gas can be in several minutes, detected exactly, and the determination and analysis of ambient atmosphere propionic acid can be used for.
In order to achieve the above object, the technical solution adopted in the utility model is: a kind of device that can detect propionic acid gas, this device comprises two air inlet pipelines and an outlet pipe, described two draft tube are merged into leads up to drying tube and enters and detect bottle, detect bottle and upward use rubber stopper seal, be inserted with a quartz crystal sensor and described escape pipe in the described rubber plug, the class coating material that is coated on the sensor is benzo 18 hats 6, described quartz crystal sensor is connected with transistor-transistor-logic (TTL) oscillatory circuit, described oscillatory circuit is driven by direct supply, and be connected with frequency counter, constitute a complete sensing detection loop.It is characterized in that device each several part design, quartz crystal sensor application and propionic acid gas is had the use that is coated with membrane substance benzo 18 hats 6 of special adsorption function, find that by a large amount of experimental datas its amount that is coated on the quartz crystal sensor is the detection best results between 5～35 micrograms time.Whole device is formed by above several component-assembled, and readily removable removing changed, and is easy to carry.Its principle of work is that propionic acid gas optionally is adsorbed on and is coated with on membrane substance benzo 18 hat 6, and the small mass change of generation can make the resonance frequency of sensor change, and calculates the propionic acid concentration in the gas sample surveyed with the frequency change value.This gas sensing pick-up unit has high sensitivity and wide sensing range to propionic acid, and selectivity, reappearance and reversibility are good, can be applicable to the monitoring of propionic acid in the ambient atmosphere.
On Design of device, but two air inlet pipeline independent switches of nitrogen and propionic acid gas sample, and nitrogen and propionic acid gas sample can alternately enter and detect in the bottle.Nitrogen can make and be adsorbed on the described propionic acid desorbing gas that is coated with on the membrane substance, makes sensor resonant frequency return to initial value.Whole process just can be finished with interior at 5 minutes, just can continue on for detection next time subsequently, so this device can reduce detection time effectively and simplify the operation course.
The beneficial effects of the utility model are, can measure the concentration of propionic acid gas accurately, rapidly, continuously, and apparatus structure are simple, is easy to portable and intellectualized reconstruction, thereby can be used for the analyzing and testing, on-line monitoring of propionic acid in the ambient atmosphere etc.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is the synoptic diagram of simple and easy propionic acid gas-detecting device.
Fig. 2 is the graph of relation of frequency change value (representing with Hz) Yu the propionic acid gas corresponding concentration (mg/L) of sensor.
Fig. 3 is the molecular structure that the propionic acid gas molecule is had benzo 18 hats 6 of specific selective adsorption function.
1. gas sample draft tube among Fig. 1,2. nitrogen draft tube, 3. gas sample draft tube switch, 4. nitrogen draft tube switch, 5 drying tubes (the anhydrous CaCl of interior filling
2), 6. quartz crystal sensor, 7. escape pipe switch, 8. rubber plug, 9. escape pipe 10. detects bottle, 11. oscillatory circuits, 12. direct supplys, 13. frequency counters.
Fig. 2 is coated on benzo 18 hats 6 of 12.5 micrograms on the quartz crystal sensor, by adding the propionic acid standard model, can obtain the relation curve of propionic acid gas concentration and response frequency changing value, and the equation of this curve fitting is:
y＝22.09+25.37x
Y represents the concentration (mg/L) of propionic acid gas in the formula, and x represents frequency change value Δ F (Hz).The above-mentioned relation curve is drawn when 24 ℃ of room temperatures.
Embodiment
As shown in fig. 1, two draft tube 1,2 are merged into one the tunnel through entering detection bottle 10 bottoms behind the drying tube 5, and detecting bottle 10 can be glass, also can be plastic, big or small desirable 0.5L.Detect on the bottle 10 with rubber plug 8 sealings, be inserted with a quartz crystal sensor 6 and escape pipe 9 in the rubber plug 8, quartz crystal sensor 6 is connected with oscillatory circuit 11, oscillatory circuit 11 is driven by direct supply 12 and is connected with frequency counter 13, so just is assembled into a complete sensing detection loop easily.Should be mentioned that quartz crystal sensor 6 the above coating material benzo 18 hat 6 are key substance of this sensing detection, it can carry out selective adsorption with sensitivity to propionic acid gas by the supermolecule effect.Rubber plug 8 with detect bottle 10, escape pipe 9 all is close-connected with rubber plug 8, and is good with this overall tightness that guarantees to detect bottle 10.
The concrete operating process that detects is as follows:
1. opening power at first, make oscillatory circuit 11 starting of oscillations, this moment, frequency counter 13 can demonstrate the frequency of vibration, opened nitrogen draft tube switch 4 and escape pipe switch 7 then, treat that its frequency shows and close nitrogen draft tube switch 4 and escape pipe switch 7 when stablizing, note original frequency value F
1
2. open gas sample draft tube switch 3 and escape pipe switch 7 then, when treating that frequency counter 13 demonstrations are stablized, close hold one's breath sample draft tube switch 3 and escape pipe switch 7, note frequency value F
2
3. (Δ F Hz) can be drawn by following formula the frequency response values of each gas sample: Δ F=F
1-F
2, Δ F is updated in the working curve equation of Fig. 2, can calculate the concentration value of propionic acid gas in the gas sample;
4. after detection finishes, open escape pipe switch 7 and nitrogen draft tube switch 4, make frequency counter 13 display frequencies return to original frequency value F
1, close all gas circuits then, use in order to detecting next time.
The utility model can be applied to the on-line analysis monitoring of propionic acid gas in the ambient atmosphere.Employed quartz crystal sensor has the real-time response performance, can in time reflect the concentration of propionic acid in the detected gas sample.As long as gas sample pipeline is connected to the monitoring point, just can reach the purpose of remote monitor.
Claims (4)
1. simple and easy propionic acid gas-detecting device, it is characterized in that: this device is merged into one the tunnel through entering detection bottle (10) bottom behind the drying tube (5) by two draft tube (1,2), detecting bottle (10) goes up with rubber plug (8) sealing, be inserted with a quartz crystal sensor (6) and escape pipe (9) in the rubber plug (8), quartz crystal sensor (6) is connected with oscillatory circuit (11), oscillatory circuit (11) is driven by direct supply (12) and is connected with frequency counter (13), constitutes a complete sensing detection loop.
2. simple and easy propionic acid gas-detecting device according to claim 1 is characterized in that: two air inlet pipelines (1,2) can independent gauge tap, and nitrogen and propionic acid gas sample can alternately enter and detect in the bottle (10).
3. simple and easy propionic acid gas-detecting device according to claim 1 is characterized in that: the responsive class coating material that is coated on the quartz crystal sensor (6) is benzo 18 hats 6.
4. simple and easy propionic acid gas-detecting device according to claim 3 is characterized in that: the amount that is coated on responsive class coating material benzo 18 hats 6 on the quartz crystal sensor (6) is 5～35 micrograms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200147741U CN201926602U (en) | 2011-01-18 | 2011-01-18 | Simple propionic acid gas detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200147741U CN201926602U (en) | 2011-01-18 | 2011-01-18 | Simple propionic acid gas detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201926602U true CN201926602U (en) | 2011-08-10 |
Family
ID=44430447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200147741U Expired - Fee Related CN201926602U (en) | 2011-01-18 | 2011-01-18 | Simple propionic acid gas detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201926602U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165819A (en) * | 2013-08-29 | 2014-11-26 | 北京至感科技有限公司 | Online real-time magnetic particle monitoring system |
| CN104535449A (en) * | 2015-01-21 | 2015-04-22 | 山东师范大学 | Non-contact electrode piezoelectric transducer device for monitoring strongly-corrosive gas and method |
| CN113075290A (en) * | 2021-03-01 | 2021-07-06 | 南京诺奥新材料有限公司 | Propionic acid concentration measuring device and method |
-
2011
- 2011-01-18 CN CN2011200147741U patent/CN201926602U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165819A (en) * | 2013-08-29 | 2014-11-26 | 北京至感科技有限公司 | Online real-time magnetic particle monitoring system |
| CN104535449A (en) * | 2015-01-21 | 2015-04-22 | 山东师范大学 | Non-contact electrode piezoelectric transducer device for monitoring strongly-corrosive gas and method |
| CN104535449B (en) * | 2015-01-21 | 2017-02-22 | 山东师范大学 | Non-contact electrode piezoelectric transducer device for monitoring strongly-corrosive gas and method |
| CN113075290A (en) * | 2021-03-01 | 2021-07-06 | 南京诺奥新材料有限公司 | Propionic acid concentration measuring device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20120118 |