CN204129035U - A kind of portable gas-sensitive type ammonia nitrogen determination instrument - Google Patents
A kind of portable gas-sensitive type ammonia nitrogen determination instrument Download PDFInfo
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- CN204129035U CN204129035U CN201420538369.3U CN201420538369U CN204129035U CN 204129035 U CN204129035 U CN 204129035U CN 201420538369 U CN201420538369 U CN 201420538369U CN 204129035 U CN204129035 U CN 204129035U
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Abstract
The utility model discloses a kind of portable gas-sensitive type ammonia nitrogen determination instrument.It comprises liquid reactions chamber and gas-detecting cavity; Liquid reactions chamber is connected by pneumatic circuit with gas-detecting cavity; Pneumatic circuit is provided with 2 three-way solenoid valves and an air pump, between the gas vent that three-way solenoid valve is located at liquid reactions chamber and the gas access of gas-detecting cavity, another three-way solenoid valve is located between the gas vent of gas-detecting cavity and the gas access in liquid reactions chamber; Be provided with air-sensitive ammonia gas sensor and Temperature Humidity Sensor in gas-detecting cavity, air-sensitive ammonia gas sensor is all connected with sensor circuit board with Temperature Humidity Sensor, and sensor circuit board is connected with control circuit board, and control circuit board is located at outside gas-detecting cavity.Liquid reactions chamber headspace gas, by gas phase and liquid phase separation, is pumped into gas-detecting cavity during detection and measures by the utility model gas-sensitive type ammonia nitrogen determination instrument, during non-detection, the surrounding air after filtration is pumped into the cleaning that gas-detecting cavity carries out sensor.
Description
Technical field
The utility model relates to a kind of special purpose device detecting ammonia-nitrogen content in water, is specifically related to a kind of portable gas-sensitive type ammonia nitrogen determination instrument.
Background technology
Ammonia-nitrogen content in water is an important indicator of river pollution, and in current water, the main method of testing of ammonia nitrogen comprises: reagent colorimetric method, salicylic acid-hypochlorite colourimetry, ion-selective electrode method, distillation and titrimetry, the chromatography of ions and high-efficient liquid phase technique etc.
The measurement sensitivity of reagent colorimetric method is higher, detectability can reach 0.02mg/L, be widely used in the detection of potable water and sewage in the lab, but following problem limits the popularization of the method: metallic ion, sulfide and the organism such as suspension, chlorine residue, calcium magnesium all can bring interference to test, so need carry out sample pretreatment; Nessler reagent strong toxicity and not easily preserving, in analytic process, a large amount of mercury salt that uses can cause environmental pollution.It is 1mg/L that salicylic acid-hypochlorite colourimetry measures the upper limit, and current Problems existing is as follows: detect after needing dilution to high-concentration sewage, and needs repeatedly to sound out for the sample of unknown concentration; Developing time longer (under normal temperature at least 1h), reagent stability is poor; Aniline and monoethanolamine can produce severe jamming to this method, and too high acidity and basicity all can disturb the formation of color-developing compounds, also have interference during the material reduced containing making hypochlorite ion.Ion-selective electrode method detects and is limited to 0.07mg/L, the range of linearity is 0.4 ~ 1400mg/L, not by the impact of colourity, turbidity, suspension, therefore do not need through pre-service, but the interference of high ion concentration water sample and the quality existing problems of electrode own make it be difficult to widespread use.Distillation and titrimetry are the analytical approachs that laboratory is commonly used, concrete operations are: the pH of adjusting sample is in the scope of 6.0-7.4, adding magnesium oxide makes in alkalescence, the BAS that the ammonia that distillation disengages is received in bottle absorbs, with methyl red-methylenum careuleum for indicator, with the ammonium in sour standard solution titration distillate.The method has easy and simple to handle, highly sensitive, and detectability reaches the advantage of 0.2mg/L, but needs equally to take preprocess method to eliminate the chaff interference of mensuration process, and in titration process, adopt visual method to judge titration end-point, introduces larger personal error.Chromatography of ions and high-pressure liquid chromatography have successfully analyzed the ammonia in various water sample, but all need water sample clean especially, and the instrument price used is expensive, therefore applies less.
This shows, there is the deficiencies such as the complicated cost of Instrument Design is high, mensuration process is loaded down with trivial details, require high, determination period long to human users in above-mentioned existing method.
Utility model content
The purpose of this utility model is to provide portable gas-sensitive type ammonia nitrogen determination instrument, be specially a kind of gas-liquid separation type water body ammonia nitrogen determination instrument based on amino molecule gas-liquid principle of mobile equilibrium, without the need to toxic reagent during detection, easy testing process achieves the ammonia nitrogen test of water body; Liquid reactions is separated with gas detection function by the utility model, is placed in reaction chamber and test chamber respectively, has both achieved the measurement function of gas-sensitive type ammonia nitrogen, solves again liquid to the pollution of sensor and damage problem.
Portable gas-sensitive type ammonia nitrogen determination instrument provided by the utility model, comprises liquid reactions chamber and gas-detecting cavity;
Described liquid reactions chamber is connected by pneumatic circuit with described gas-detecting cavity;
Described pneumatic circuit is provided with 2 three-way solenoid valves and an air pump, between the gas vent that described three-way solenoid valve is located at described liquid reactions chamber and the gas access of described gas-detecting cavity, three-way solenoid valve described in another is located between the gas vent of described gas-detecting cavity and the gas access in described liquid reactions chamber;
Air-sensitive ammonia gas sensor and Temperature Humidity Sensor is provided with in described gas-detecting cavity, described air-sensitive ammonia gas sensor is all connected with sensor circuit board with described Temperature Humidity Sensor, described sensor circuit board is connected with control circuit board, and described control circuit board is located at outside described gas-detecting cavity.
In described portable gas-sensitive type ammonia nitrogen determination instrument, the gas vent in described liquid reactions chamber is located at the top in described liquid reactions chamber, the bottom in described liquid reactions chamber is located in the gas access in described liquid reactions chamber, can realize respectively carrying out aeration to the liquid in described liquid reactions chamber and headspace gas enters described gas-detecting cavity.
In described portable gas-sensitive type ammonia nitrogen determination instrument, another entrance being located at the described three-way solenoid valve between the gas vent in described liquid reactions chamber and the gas access of described gas-detecting cavity is connected with a gas filter, in order to cleaning ambient air, realize cleaning without ammonia test chamber.
In described portable gas-sensitive type ammonia nitrogen determination instrument, the gas outlet end of described gas-detecting cavity is located at by described air pump, by the work of described air pump, carries out aeration to impel the volatilization of amino molecule to the liquid in described liquid reactions chamber, accelerate the mobile equilibrium of ammonia in gas circuit, improve detection speed
In described portable gas-sensitive type ammonia nitrogen determination instrument, described sensor circuit board realizes being sealed and matched by O-ring seal and described gas-detecting cavity.
In described portable gas-sensitive type ammonia nitrogen determination instrument, attitude sensor is provided with in described gas-detecting cavity, described attitude sensor is connected with described control circuit board with described sensor circuit board successively, initiatively switching described three-way solenoid valve in time when there being liquid to invade the risk of pneumatic circuit, preventing liquid from entering described gas-detecting cavity and damaging each sensor.
Liquid reactions chamber headspace gas, by gas phase and liquid phase separation, is pumped into gas-detecting cavity during detection and measures by the utility model gas-sensitive type ammonia nitrogen determination instrument, during non-detection, the surrounding air after filtration is pumped into the cleaning that gas-detecting cavity carries out sensor.Realized the active cycle of gas flow path by three-way solenoid valve and air pump, accelerate the mobile equilibrium of ammonia in gas circuit, improve detection speed.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model portable gas-sensitive type ammonia nitrogen determination instrument.
In figure, each mark is as follows:
1 liquid reactions chamber, 2 gas filters, 3,4 three-way solenoid valves, 5 air pumps, 6 gas-detecting cavities, 7 sensor combinations, 8 sensor circuit boards, 9 control circuit boards 9.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further, but the utility model is not limited to following examples.
As shown in Figure 1, be the portable gas-sensitive type ammonia nitrogen determination instrument that the utility model provides, it comprises liquid reactions chamber 1 and gas-detecting cavity 6, and wherein liquid reactions chamber 1 is connected by pneumatic circuit with gas-detecting cavity 2.Pneumatic circuit in the utility model is provided with 2 three-way solenoid valves 3 and 4, and an air pump 5, wherein three-way solenoid valve 4 is located between the gas vent in liquid reactions chamber 1 and the gas access of gas-detecting cavity 6, three-way solenoid valve 3 is located between the gas vent of gas-detecting cavity 6 and the gas access in liquid reactions chamber 1, and the gas outlet end of gas-detecting cavity 6 is located at by air pump 5, by the work of this air pump 5, aeration is carried out to impel the volatilization of amino molecule to the liquid in liquid reactions chamber 1, accelerate the mobile equilibrium of ammonia in gas circuit, improve detection speed.In the utility model, in order to realize carrying out aeration to the liquid in liquid reactions chamber 1 and headspace gas enters in gas-detecting cavity 6, the gas access in liquid reactions chamber 1 is located at bottom it, and gas vent portion provided thereon.In addition, in order to cleaning ambient air, realize cleaning without ammonia test chamber, another entrance of three-way solenoid valve 4 is connected with gas filter 2.
As shown in Figure 1, air-sensitive ammonia gas sensor, Temperature Humidity Sensor and attitude sensor is provided with in gas-detecting cavity 6, these sensors composition sensor combinations 7, this sensor combinations 7 is connected with sensor circuit board 8, sensor circuit board 8 is connected with control circuit board 9, and control circuit board 9 is located at outside gas-detecting cavity 6, sensor circuit board 8 realizes being sealed and matched with gas-detecting cavity 6 by O-ring seal (not showing in way).In the utility model, set attitude sensor can prevent liquid from entering in gas-detecting cavity 6 and damaging each sensor, this effect is achieved in that when there being liquid to invade the risk of pneumatic circuit, this attitude sensor can monitor the conversion of liquid level, this signal of timely transmission is to control circuit board 9, control circuit board 9 is switching three-way solenoid valve 3 and 5 initiatively, makes both all be communicated with outside air.
Use above-mentioned portable gas-sensitive type ammonia nitrogen determination instrument to measure ammonia nitrogen concentration can carry out in accordance with the following steps:
Before mensuration, control circuit board 9 regulates three-way solenoid valve 3 and 4 that liquid reactions chamber 1 and the equal outside air of gas-detecting cavity 6 are connected automatically, the surrounding air filtered through gas filter 2 pumps in gas-detecting cavity 6 by air pump 5, the response at zero point of determination sensor combination 7.
During mensuration, testing sample and reagent mix and add in liquid reactions chamber 1 and control application of sample amount by the scale on reaction chamber surface by user, the pushbutton enable on instrument panel is used to measure, control circuit board 9 automatically regulates three-way solenoid valve 3 and 4 to make liquid reactions chamber 1 realize gas with gas-detecting cavity 6 to be communicated with, the headspace gas in liquid reactions chamber 1 pumps in gas-detecting cavity 6 by air pump 5 continuous service, sensor combinations 7 responds to gas information, and control circuit board 9 Information Monitoring is also carried out ammonia nitrogen concentration that data processing calculates sample and to be gone forward side by side line item and display.
After mensuration terminates, control circuit board 9 regulates three-way solenoid valve 3 and 4 that liquid reactions chamber 1 is all connected with outside air with gas-detecting cavity 6 automatically, the surrounding air filtered through gas filter 2 pumps in gas-detecting cavity 6 by air pump 5, carry out cleaning to sensor combinations 7 to recover, in order to measuring next time.
In the utility model portable gas-sensitive type ammonia nitrogen determination instrument operational process, control circuit board 9, according to the response message of instrument current operating conditions and sensor combinations 7, judges automatically to control testing process by the terminal that gas circulates.The attitude sensor of control circuit board 9 continues to monitor the position that instrument is placed simultaneously, when instrument be in tilt to certain angle time, be switched to surrounding air path by automatically controlling three-way solenoid valve 3 and 4, and stop air pump running, damage sensor to prevent liquid from entering test chamber 6.
It should be noted that, the embodiment shown in Fig. 1 is the preferred embodiment that the utility model is introduced, and those skilled in the art can design more embodiment on this basis completely, therefore do not repeat herein.
Claims (6)
1. a portable gas-sensitive type ammonia nitrogen determination instrument, is characterized in that: it comprises liquid reactions chamber and gas-detecting cavity;
Described liquid reactions chamber is connected by pneumatic circuit with described gas-detecting cavity;
Described pneumatic circuit is provided with 2 three-way solenoid valves and an air pump, between the gas vent that described three-way solenoid valve is located at described liquid reactions chamber and the gas access of described gas-detecting cavity, three-way solenoid valve described in another is located between the gas vent of described gas-detecting cavity and the gas access in described liquid reactions chamber;
Air-sensitive ammonia gas sensor and Temperature Humidity Sensor is provided with in described gas-detecting cavity, described air-sensitive ammonia gas sensor is all connected with sensor circuit board with described Temperature Humidity Sensor, described sensor circuit board is connected with control circuit board, and described control circuit board is located at outside described gas-detecting cavity.
2. portable gas-sensitive type ammonia nitrogen determination instrument according to claim 1, is characterized in that: the gas vent in described liquid reactions chamber is located at the top in described liquid reactions chamber, the bottom in described liquid reactions chamber is located in the gas access in described liquid reactions chamber.
3. portable gas-sensitive type ammonia nitrogen determination instrument according to claim 1 and 2, is characterized in that: another entrance being located at the described three-way solenoid valve between the gas vent in described liquid reactions chamber and the gas access of described gas-detecting cavity is connected with a gas filter.
4. portable gas-sensitive type ammonia nitrogen determination instrument according to claim 3, is characterized in that: the gas outlet end of described gas-detecting cavity is located at by described air pump.
5. portable gas-sensitive type ammonia nitrogen determination instrument according to claim 4, is characterized in that: described sensor circuit board realizes being sealed and matched by O-ring seal and described gas-detecting cavity.
6. portable gas-sensitive type ammonia nitrogen determination instrument according to claim 5, it is characterized in that: be provided with attitude sensor in described gas-detecting cavity, described attitude sensor is connected with described control circuit board with described sensor circuit board successively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420538369.3U CN204129035U (en) | 2014-09-18 | 2014-09-18 | A kind of portable gas-sensitive type ammonia nitrogen determination instrument |
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| CN201420538369.3U CN204129035U (en) | 2014-09-18 | 2014-09-18 | A kind of portable gas-sensitive type ammonia nitrogen determination instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606765A (en) * | 2015-12-21 | 2016-05-25 | 苏州纳格光电科技有限公司 | Formaldehyde tester |
| CN106770592A (en) * | 2016-12-13 | 2017-05-31 | 派棱环保科技（苏州）有限公司 | A kind of float type ammonia nitrogen water quality detecting system and its detection method |
| CN108776198A (en) * | 2018-07-31 | 2018-11-09 | 上海安杰环保科技股份有限公司 | A kind of nitrogen sulfide detection device and detection method based on chemical vapors genetic method |
| CN109374732A (en) * | 2018-08-14 | 2019-02-22 | 杭州超钜科技有限公司 | Tomography escapes the portable quick hydrogen-measuring apparatus of gas and its monitoring method |
-
2014
- 2014-09-18 CN CN201420538369.3U patent/CN204129035U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606765A (en) * | 2015-12-21 | 2016-05-25 | 苏州纳格光电科技有限公司 | Formaldehyde tester |
| CN106770592A (en) * | 2016-12-13 | 2017-05-31 | 派棱环保科技（苏州）有限公司 | A kind of float type ammonia nitrogen water quality detecting system and its detection method |
| CN108776198A (en) * | 2018-07-31 | 2018-11-09 | 上海安杰环保科技股份有限公司 | A kind of nitrogen sulfide detection device and detection method based on chemical vapors genetic method |
| CN109374732A (en) * | 2018-08-14 | 2019-02-22 | 杭州超钜科技有限公司 | Tomography escapes the portable quick hydrogen-measuring apparatus of gas and its monitoring method |
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