CN202661347U - Simple ammonia detection device - Google Patents
Simple ammonia detection device Download PDFInfo
- Publication number
- CN202661347U CN202661347U CN 201220258997 CN201220258997U CN202661347U CN 202661347 U CN202661347 U CN 202661347U CN 201220258997 CN201220258997 CN 201220258997 CN 201220258997 U CN201220258997 U CN 201220258997U CN 202661347 U CN202661347 U CN 202661347U
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- quartz crystal
- crystal sensor
- ammonia
- detection device
- bottle
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The utility model discloses a simple ammonia detection device which is characterized in that two gas inlet pipe (1 and 2) are combined into a path to pass through a drying pipe (5) and enter 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 coating material coated on the quartz crystal sensor is pyridoxine hydrochloride/polyvinyl chloride and can adsorb ammonia molecules with high sensitivity and high selectivity through the hydrogen-bond interaction; 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 to form a complete sensing detection loop. The device is easy and convenient to manufacture, can accurately and rapidly detect the ammonia concentration in the ambient atmosphere and can be used for online detection.
Description
Technical field
The utility model relates to a kind of easy ammonia (NH
3) the gas sensing pick-up unit, this device can detect the concentration of ammonia gas in the ambient atmosphere accurately and rapidly, and can be used for on-line monitoring.
Background technology
Ammonia is one of the main poisonous air pollutants in resident living area and commercial production district, eyes, skin and the upper respiratory tract to humans and animals have the strong impulse effect, suck a large amount of ammonias can cause shed tears, pharyngalgia, the symptom such as uncomfortable in chest, nauseating, pulmonary edema, adult respiratory distress syndrome (ARDS) even shock can occur and cause death in severe patient.The ammonia Cmax that allows in U.S. Occupational Safety and Health Administration (OSHA) the regulation air is 50 ppm, therefore the sensitivity monitoring tool of micro-ammonia in the ambient atmosphere is of great significance.The assay method of ammonia mainly contains acid base titration, spectrophotometric method, vapor-phase chromatography, high performance liquid chromatography, infra-red sepectrometry, mass spectrometry and ion-selective electrode method etc. at present, these most methods are because operation link is many, waste time and energy, be unsuitable for the concentration of on-line monitoring ammonia gas, therefore a kind of low cost, easy and simple to handle need to be found, and the apparatus of accurate Fast Measurement ammonia gas concentration can be reached.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of easy ammonia detection device, but this device is easy to preparation, easy to operate Reusability, the concentration of ammonia gas can be in several minutes, detected exactly, and the determination and analysis of ambient atmosphere ammonia 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 ammonia gas, this device comprises two draft tube and an escape pipe, described two draft tube are merged into one the tunnel through entering detection bottle bottom behind the drying tube, and drying tube inner stuffing matter is anhydrous CaCl
2Detect the upper rubber stopper seal of using of bottle, 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 Pyridoxine Hydrochloride/Polyvinylchloride of 1:1, described quartz crystal sensor is connected with transistor-transistor-logic (TTL) oscillatory circuit, described oscillatory circuit is driven by direct supply and is connected with frequency counter, consists of a complete sensing detection loop.It is characterized in that device each several part design, quartz crystal sensor application and ammonia gas is had the use of the class coating material Pyridoxine Hydrochloride/Polyvinylchloride of special adsorption function, find by lot of experimental data, its amount that is coated on the quartz crystal sensor is the detection best results between 5 ~ 45 micrograms time.Whole device is formed by above several assembling parts, and is readily removable except changing, and is easy to carry.Its principle of work is that ammonia gas optionally is adsorbed on class coating material Pyridoxine Hydrochloride/Polyvinylchloride, and the Tiny Mass variation of generation can make the resonance frequency of sensor change, with the frequency change value calculate surveyed ammonia concentration in the gas sample.This gas sensing pick-up unit has high sensitivity and wide sensing range to ammonia, and selectivity, reappearance and reversibility are good, can be applicable to the monitoring of ammonia in the ambient atmosphere.
In the design of device, two draft tube of nitrogen and krypton gas sample can independent gauge tap, and nitrogen and krypton gas sample can alternately enter and detect in the bottle.Nitrogen can make the ammonia gas desorption that is adsorbed on the described class coating material, makes sensor resonant frequency return to initial value.Whole process exists
5Minute just can finish with interior, just can continue on for subsequently detection next time, so this device can effectively reduce detection time and simplify the operation course.
The beneficial effects of the utility model are, can measure accurately, rapidly, continuously the concentration of ammonia gas, 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 ammonia in the ambient atmosphere etc.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is the schematic diagram of simple and easy ammonia detection device.
Fig. 2 is the graph of relation of frequency change value (representing with Hz) Yu the ammonia gas corresponding concentration (ppm) of sensor.
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 tube, 6. quartz crystal sensor, 7. escape pipe switch, 8. rubber plug, 9. escape pipe, 10. detect bottle, 11. oscillatory circuits, 12. direct supplys, 13. frequency counters.
Fig. 2 is coated on the Pyridoxine Hydrochloride/Polyvinylchloride of 13.8 micrograms on the quartz crystal sensor, by adding the ammonia standard model, can obtain the relation curve of ammonia gas concentration and response frequency changing value, and the equation of this curve is:
y?=?5.03?+?1.54?
x
In the formula
yThe concentration (ppm) of expression ammonia gas,
xExpression 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 and detect bottle 10 bottoms through entering behind the drying tube 5, and drying tube 5 inner stuffing matter are anhydrous CaCl
2Detecting bottle 10 can be glass system, 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 easily a complete sensing detection loop.Should be mentioned that, quartz crystal sensor 6 the above class coating material Pyridoxine Hydrochloride/Polyvinylchloride are key substance of this sensing detection, and it can carry out with sensitivity selective adsorption to ammonia by hydrogen bond action.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, then opened nitrogen draft tube switch 4 and escape pipe switch 7, treat that its frequency shows and close nitrogen draft tube switch 4 and escape pipe switch 7 when stablizing, record original frequency value F
1
2. then open gas sample draft tube switch 3 and escape pipe switch 7, when treating that frequency counter 13 demonstrations are stablized, close hold one's breath sample draft tube switch 3 and escape pipe switch 7, record frequency value F
2
3. the frequency response values of each gas sample (Δ F, Hz) can be drawn by following formula: Δ F=F
1-F
2, Δ F is updated in the working curve equation of Fig. 2, can calculate the concentration value of ammonia in the gas sample;
4. detect complete after, open escape pipe switch 7 and nitrogen draft tube switch 4, make frequency counter 13 display frequencies return to original frequency value F
1, then close all gas circuits, use in order to detecting next time.
The utility model can be applied to the on-line analysis monitoring of ammonia gas in the ambient atmosphere.Employed quartz crystal sensor has the real-time response performance, can in time reflect the concentration of ammonia 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 ammonia detection device, it is characterized in that: two draft tube (1,2) are merged into one the tunnel through entering detection bottle (10) bottom behind the drying tube (5), detect bottle (10) upper 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), consists of a complete sensing detection loop.
2. simple and easy ammonia detection device according to claim 1 is characterized in that: two draft tube (1,2) can independent gauge tap, and nitrogen and krypton gas sample can alternately enter and detect in the bottle (10).
3. simple and easy ammonia detection device according to claim 1, it is characterized in that: the class coating material that is coated on the quartz crystal sensor (6) is Pyridoxine Hydrochloride/Polyvinylchloride of 1:1.
4. simple and easy ammonia detection device according to claim 3, it is characterized in that: the amount that is coated on the class coating material Pyridoxine Hydrochloride/Polyvinylchloride on the quartz crystal sensor (6) is 5 ~ 45 micrograms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258997 CN202661347U (en) | 2012-06-04 | 2012-06-04 | Simple ammonia detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258997 CN202661347U (en) | 2012-06-04 | 2012-06-04 | Simple ammonia detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202661347U true CN202661347U (en) | 2013-01-09 |
Family
ID=47456247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220258997 Expired - Fee Related CN202661347U (en) | 2012-06-04 | 2012-06-04 | Simple ammonia detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202661347U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204294A (en) * | 2014-05-30 | 2015-12-30 | 中芯国际集成电路制造(上海)有限公司 | Ammonia concentration detection method and photoetching process figure critical dimension (CD) control method |
| CN111474284A (en) * | 2020-04-09 | 2020-07-31 | 中国工程物理研究院材料研究所 | Feed gas pretreatment and automatic sample introduction system for gas chromatography |
-
2012
- 2012-06-04 CN CN 201220258997 patent/CN202661347U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204294A (en) * | 2014-05-30 | 2015-12-30 | 中芯国际集成电路制造(上海)有限公司 | Ammonia concentration detection method and photoetching process figure critical dimension (CD) control method |
| CN105204294B (en) * | 2014-05-30 | 2017-07-28 | 中芯国际集成电路制造(上海)有限公司 | Figure CD method in ammonia concentration method for detecting and control photoetching process |
| CN111474284A (en) * | 2020-04-09 | 2020-07-31 | 中国工程物理研究院材料研究所 | Feed gas pretreatment and automatic sample introduction system for gas chromatography |
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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: 20130109 Termination date: 20140604 |