KR20100004383U - Volatile Organic Compounds Detector - Google Patents

Abstract

The present invention relates to a volatile organic compound detector for detecting a plurality of volatile organic compounds at a time the volatile organic compounds contained in the atmosphere, and more particularly, a gas inlet (10) into which a predetermined atmosphere containing volatile organic compounds is introduced from the outside. ), An air inlet 20 for introducing predetermined clean air that does not contain volatile organic compounds in a separate tank or the outside, and a valve 30 for opening and closing the gas inlet 10 and the air inlet 20. The sensor array 40 detects volatile organic compounds contained in the atmosphere introduced by opening and closing of the valve 30, and the canister 41 includes air or clean air introduced into the sensor array 40. In the circulation pump 50 to force the circulation in the inside, the exhaust pump is configured in the rear end of the circulation pump 50 to discharge the outside air or clean air to the outside, and the sensor array 40 The sensor amplifier 70 for amplifying the obtained data signal, the sensor C oil unit 80 for calculating a reference voltage based on the data signal amplified by the sensor amplifier 70, and the sensor C oil unit 80 The main controller 90 controls the valve 30 and the circulation pump 50 based on the calculated data value, and the main controller 90 controls the screen display or audio output signal based on the calculated data value. It further comprises an LCD display unit 100 for displaying the analysis data of the atmosphere in the form of a character, a chart or a graph, and a voice output unit 110 that is controlled by the main controller 90 and outputs a voice when the set reference value is exceeded. The sensor array 40 may include a canister 41 to circulate air or clean air, and a temperature sensor, a humidity sensor, and 7 may be formed on an outer surface of the canister 41. Olfactory sensors (42) And right or upper and achieved by the configuration in parallel to the up and down pairs, provides a VOC detector capable of measuring a variety of volatile organic compounds or the detection of the concentration at a time contained in the atmosphere.

Volatile Organic Compounds, Olfactory Sensors, Sensor Arrays, Formaldehyde, Carbon Monoxide, Carbon Dioxide, Fine Dust

Description

Volatile Organic Compounds Detector

The present invention relates to a volatile organic compound detector which detects a plurality of volatile organic compounds at a time and analyzes the concentration of volatile organic compounds contained in the atmosphere with one detector, and more particularly, includes volatile organic compounds from the outside. A gas inlet 10 through which a predetermined atmosphere is introduced, an air inlet 20 for introducing clean air that does not contain volatile organic compounds from a separate tank or the outside, and the gas inlet 10 and an air inlet ( 20, the valve 30 to open and close, the sensor array 40 for detecting the volatile organic compounds contained in the air flow introduced by the opening and closing of the valve 30, the atmosphere introduced into the sensor array 40 or A circulation pump 50 for forcibly circulating clean air in the canister 41 and a rear end of the circulation pump 50 to discharge air or clean air to the outside. A sensor C oil unit 80 that calculates a reference voltage based on an outlet 60, a sensor amplifier 70 that amplifies the data signal obtained from the sensor array 40, and a data signal amplified by the sensor amplifier 70. And a main controller that receives the data signal calculated by the sensor C oil unit 80 and controls the valve 30 and the circulation pump 50, and controls a screen display or an audio output signal based on the calculated data value. 90), the LCD display unit 100, which is controlled by the main controller 90 to display the analysis data of the atmosphere in a text, diagram, or graph, and controlled by the main controller 90 to exceed the set reference value. To configure the voice output unit 110 for outputting, the sensor array 40 constitutes a canister (canister) to circulate the air or clean air, the temperature on the outer surface of the canister (41) Sensor, humidity sensor 7 pairs of olfactory sensors 42 are configured in parallel by pairing left, right or up and down, so that the volatile organic compounds contained in the atmosphere can be detected at once or the concentration can be measured. It has high sensitivity and can have a selectivity to selectively measure volatile organic compounds without replacing or installing a separate detector, and can realize measurement conditions of constant temperature by heating the air by a heater unit. The present invention relates to a volatile organic compound detector that can be calibrated to obtain reliable measured values.

Since the industrial revolution, industrial developments have highlighted the air pollution caused by the by-products of toxic gases, and the risk of gas explosion and gas poisoning has increased.

In particular, in recent years, volatile organic compounds (VOCs) cause a great deal of social controversy, and when volatile organic compounds (VOCs) coexist with nitrogen oxides in the atmosphere, photochemical reactions occur due to the action of sunlight. It refers to a substance that causes photochemical smog by generating photochemical oxidizing substances such as air pollutants, air pollutants and carcinogenic toxic chemicals, which are precursors of photochemical oxides, and also cause global warming and cause odor. Also do.

For example, petrochemicals, organic solvents or other substances in Korea are 31 substances such as benzene, acetylene and gasoline.

This ranges from solvents used in industry to organic gases emitted from chemical and pharmaceutical factories or plastic drying processes, and hydrocarbons commonly used in everyday life such as low boiling liquid fuel, paraffin, olefins, aromatic compounds, etc. Yes.

The sources of volatile organic compounds (VOCs) include natural sources such as soil, wetlands, vegetation and grasslands, and artificial sources such as organic solvent use facilities, coating facilities, laundry facilities, storage stations, gas stations, and exhaust gases from various means of transportation. Emissions are mostly made up of mobile pollutants such as organic solvent use facilities and automobiles.

Due to the serious air pollution in the emission of the volatile organic compounds (VOC), the emission regulations are made today, and various olfactory sensors have been developed to measure and detect the concentration of volatile organic compounds (VOC) contained in the atmosphere.

Among them, the semiconductor olfactory sensor is a sintered body such as SnO2 or ZnO, which is a metal oxide semiconductor, and measures the presence and concentration of a specific gas in the air as a change in resistance. It has been mainly used for gas leak alarm and gas concentration measurement.

During this process, the sensor is evolved, commercialized, and used in the industrial, medical and real-life fields according to the detection gas and its application through the improvement of its material and applied sensor mechanism.

Although the above-described technique constitutes a detector composed of only one type of olfactory sensor, the process can be simplified and the possibility of instability due to deterioration of the detector can be reduced, but various types of olfactory sensors can be used for accurate determination of volatile organic compounds. Using only one type of detector has a problem because it is necessary to synthesize the results by using the result.

Therefore, the process can be simplified by constructing a detector composed of only one type of olfactory sensor, and the possibility of instability due to deterioration of the detector can be reduced, but various types of olfactory sensors can be used for accurate determination of volatile organic compounds. It is not easy to detect volatile organic compounds or determine the concentration in air by using only one type of olfactory sensor.

Therefore, the present invention constitutes a gas inlet through which a predetermined atmosphere containing volatile organic compounds is introduced from the outside, and constitutes an air inlet through which a predetermined clean air containing no volatile organic compounds is introduced from a separate tank or the outside, A valve array configured to open and close the gas inlet and the air inlet, and a sensor array configured to detect volatile organic compounds contained in the atmosphere introduced by the opening and closing of the valve, and forcibly inserting air or clean air into the sensor array. A circulation pump configured to circulate in a canister, a rear end of the circulation pump, configured to discharge an air or clean air to the outside, and a sensor amplifier configured to amplify the data signal obtained from the sensor array Calculate a data signal amplified by the sensor amplifier, and operate the valve and the circulation pump. And a main controller configured to deliver a screen display or an audio output signal based on the calculated data value, an LCD display unit configured to display the analysis data of the atmosphere calculated by the main controller in a text, diagram or graph. The object of the present invention is to solve the conventional problems by providing a plurality of volatile organic compound detectors comprising a voice output unit based on the result calculated by the main controller, and further including an LED display unit lit by the underload signal of the main controller. It is done.

As described above, the present invention consists of a plurality of olfactory sensors as one sensor array, but the temperature sensor, the humidity sensor, and the seven olfactory sensors are located on the outer surface of the stainless steel branch line canister. By pairing them down, they are configured in parallel, and by separately configuring air inlets for introducing clean air as well as the air, it has the effect of detecting various concentrations of volatile organic compounds in the atmosphere at once or measuring the concentration. It has high sensitivity even with a small amount of gas, and can have selectivity to selectively measure volatile organic compounds without replacing or installing a separate detector, and can realize a constant temperature measurement condition by heating the atmosphere by a heater unit. In addition to the calibration of the sensor array, the sensor array body is made of stainless steel. Property to the aqueous phase of the volatile organic compound does not change the trust useful designed to obtain a measure that can.

In order to achieve the above object, the present invention provides a volatile organic compound detector for detecting a volatile organic compound contained in the atmosphere.

A gas inlet 10 into which a predetermined atmosphere containing a volatile organic compound is introduced from the outside;

An air inlet 20 for introducing predetermined clean air that does not contain volatile organic compounds in a separate tank or outside;

A valve 30 for opening and closing the gas inlet 10 and the air inlet 20;

A sensor array 40 for detecting volatile organic compounds contained in the atmosphere introduced by opening and closing of the valve 30;

A circulation pump 50 for forcibly circulating air or clean air introduced into the sensor array 40 in a canister 41;

A discharge port 60 configured at a rear end of the circulation pump 50 to discharge air or clean air to the outside;

A sensor amplifier 70 for amplifying the data signal obtained from the sensor array 40;

A sensor C oil unit 80 for calculating a reference voltage based on the data signal amplified by the sensor amplifier 70;

The main controller 90 controls the valve 30 and the circulation pump 50 by receiving the data signal calculated by the sensor C oil unit 80 and controls the display or audio output signal based on the calculated data value. Wow;

An LCD display unit 100 controlled by the main controller 90 to display atmospheric analysis data in text, diagram, or graph form;

It is configured to further include a voice output unit 110 that is controlled by the main controller 90 and outputs a voice when the set reference value is exceeded.

In addition, the sensor array 40 constitutes a canister 41 so that air or clean air flows. The sensor array 40 is electropolished using stainless steel 3041 or 3161. On the outside, a temperature sensor, a humidity sensor, and seven olfactory sensors 42 are configured in parallel by pairing left, right, or up and down.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

First, as shown in FIG. 1, a predetermined atmosphere containing volatile organic compounds is introduced from the outside through the gas inlet 10, and predetermined clean air containing no volatile organic compounds is introduced from a separate tank or outside. The air inlet 20 to be configured separately.

At this time, the gas inlet 10 and the air inlet 20 is configured to short the distance from the inlet (10, 20) to the sensor array 40 so that the atmosphere to be measured immediately enters the sensor array 40, the remaining amount after the measurement Since volatile organic compounds may remain in the sensor array 40, the calibration air (clean air) is introduced to dilute the sensor array 40.

The valve 30 is connected to the gas inlet 10 and the air inlet 20 to open and close the gas inlet 10 and the air inlet 20 according to a control signal.

And the sensor array 40 detects the volatile organic compounds contained in the atmosphere introduced into the rear end of the valve 30 by the opening and closing of the valve 30.

The sensor array 40 is a body made of a straight canister (41) so as to flow into the atmosphere or clean air as shown in Figure 2, the material is made of stainless steel 3041 or 3161 electrolytically polished A body is formed and sealed between the canister 41 and the olfactory sensor 42 by an O-ring 43 made of stainless steel, so that the properties of the volatile organic compounds introduced into the sensor array 40 do not change. You can get reliable measurements.

On the outer surface of the canister (41), a temperature sensor, a humidity sensor, and seven olfactory sensors 42 are configured in parallel by pairing left, right, up, down, and each olfactory sensor 42. The reference resistor is configured to be connected to a variable resistor (not shown). The variable resistor (not shown) is used to adjust the output voltage according to the resistance of the olfactory sensor 42 during initial calibration.

As the olfactory sensor 42, commercially available sensors such as Figaro TGS2600, TGS2602, TGS2610, TGS2611, TGS2620, FIS, SP-AQ2, SP-19, etc. are paired left, right or up and down. The outer surface of the canister 41 is formed.

The TGS2600 is a sensor that has high sensitivity at low concentrations and is used to detect contaminants in the air. The TGS2600 is sensitive enough to detect hydrogen, carbon, and monoxide in cigarette smoke. Have

The TGS2602 is a sensor having a very high sensitivity to volatile organic compounds, and has a high sensitivity for detecting a low concentration of gas such as ammonia and hydrogen sulfide in the atmosphere.

The TGS2610 has a high sensitivity for flammable gas, the TGS2611 has a high sensitivity for detecting methane gas, and the TGS2620 is a sensor having high sensitivity for alcohol or organic solvent (Solvent) vapor.

The SP-AQ2 is mainly used to measure the concentration of less than 100ppm for toxic gas to determine the air quality, SP-19 has a high sensitivity and selectivity to the hydrogen (Hydrogen).

As illustrated in FIG. 2, the olfactory sensors 42 form a sensing unit 2 which directly reacts with the atmosphere containing a volatile organic compound on one surface of the insulator 1 and the sensing unit 2. Heater 3 is configured on the opposite side of the heater, which generates heat and raises the temperature of the gas to be detected to an appropriate temperature.

At this time, the reason for maintaining at the proper temperature is to give the activation energy required for the detection reaction on the surface of the sensing unit (2).

Looking at the operation principle of the olfactory sensor 42, oxygen is normally adsorbed in the sensing unit 2, the volatile organic compound is adsorbed to the sensing unit 2 better than oxygen, the volatile organic compound is introduced and adsorbed When the oxygen is separated from the sensing unit 2 by the volatile organic compound, the electrical conductivity changes, that is, the potential barrier changes in the process of desorption, thereby changing the electrical resistance. Organic compounds and concentrations can be measured.

Referring to Figure 3a is a graph showing the state when the atmosphere does not contain a volatile organic compound in the detector when oxygen is adsorbed to the detector 2, the electrical conductivity of the olfactory sensor 42 is lowered to flow the electrons It can be seen that the dislocation barrier becomes high.

The chemical reaction equation is

이다.

to be.

As shown in FIG. 3B, when the atmosphere containing the volatile organic compound is introduced, the volatile organic compound is adsorbed to the sensing unit 2 instead of oxygen, thereby increasing the electrical conductivity of the olfactory sensor 42 and lowering the potential barrier. Able to know.

The chemical reaction equation is

이다.

to be.

If the change in the electrical resistance of the olfactory sensor through the reaction of adsorption and desorption of oxygen of the sensing unit 2 as described above,

이다.

to be.

는 후각센서의 저항이고, A는 상수, [C]는 가스농도,

는

곡선의 기울기이다. At this time

Is resistance of olfactory sensor, A is constant, [C] is gas concentration,

Is

The slope of the curve.

Therefore, by using seven kinds of olfactory sensors in an array, each of the olfactory sensor reactions can detect and detect multiple volatile organic compounds at once.

Humidity sensing measures humidity by measuring the change in capacitance according to the humidity included in the atmosphere. When the relative humidity is changed from 0 to 100%, the capacitance changes by about 163 to 201pf and outputs different frequencies according to humidity. Do it.

Temperature sensing uses a measuring range from -55 ° C to + 150 ° C, which amplifies its output so that it can be detected even at low outputs.

In addition, the circulation pump 50 is configured to force the air or clean air introduced into the sensor array 40 to circulate along the canister 41, and is configured at the rear end of the circulation pump 50 to provide atmospheric or An outlet 60 for discharging clean air to the outside is connected.

The sensor amplifier 70 amplifies the data signal obtained by the sensor array 40, and calculates a reference voltage in the sensor C oil unit 80 based on the data signal amplified by the sensor amplifier 70.

The main controller 90 receives the data signal calculated by the sensor C oil unit 80 to control the valve 30 and the circulation pump 50, and displays a screen display or audio output signal based on the calculated data value. Control, and configured by the main controller 90, the LCD display unit 100 to display the analysis data of the atmosphere in the form of text, diagram or graph, and is controlled by the main controller 90 and exceeds the set reference value. A voice output unit 110 for outputting voice is configured.

According to the above configuration, if the air to be measured is forcedly forced into the sensor array in which a plurality of olfactory sensors are arrayed, multi-monitoring of the atmosphere in the sensor array enables simultaneous detection / concentration measurement of various volatile organic compounds. .

1 is an exemplary view showing a configuration according to the present invention

2 is an exemplary view showing a configuration of an olfactory sensor according to the present invention

Figure 3a is a graph showing a state in which oxygen is adsorbed on the olfactory sensor according to the present invention

3b is a graph showing a state in which a volatile organic compound is adsorbed on the olfactory sensor according to the present invention

Figure 4 is a cross-sectional view showing the configuration of the sensor array according to the present invention

     <Explanation of symbols for each major part of drawing>

1: Insulation material 2: Detection part 3: Heater part

10: gas inlet 20: air inlet 30: valve

40: sensor array 41: canister 42: olfactory sensor

50: circulation pump 60: outlet 70: sensor amplifier

80: sensor CPU 90: main controller 100: LCD display unit

110: audio output unit

Claims (3)

In constructing a volatile organic compound detector for detecting volatile organic compounds contained in the atmosphere, A gas inlet 10 into which a predetermined atmosphere containing a volatile organic compound is introduced from the outside; An air inlet 20 for introducing predetermined clean air that does not contain volatile organic compounds in a separate tank or outside; A valve 30 for opening and closing the gas inlet 10 and the air inlet 20; A sensor array 40 for detecting volatile organic compounds contained in the atmosphere introduced by opening and closing of the valve 30; A circulation pump 50 for forcibly circulating air or clean air introduced into the sensor array 40 in a canister 41; A discharge port 60 configured at a rear end of the circulation pump 50 to discharge air or clean air to the outside; A sensor amplifier 70 for amplifying the data signal obtained from the sensor array 40; A sensor C oil unit 80 for calculating a reference voltage based on the data signal amplified by the sensor amplifier 70; The main controller 90 controls the valve 30 and the circulation pump 50 by receiving the data signal calculated by the sensor C oil unit 80 and controls the display or audio output signal based on the calculated data value. Wow; An LCD display unit 100 controlled by the main controller 90 to display atmospheric analysis data in text, diagram, or graph form; Volatile organic compound detector, characterized in that it further comprises a voice output unit 110 that is controlled by the main controller (90) and outputs a voice when the set reference value is exceeded. The method according to claim 1, The sensor array 40 constitutes a canister 41 in a straight line made of stainless steel so that air or clean air simply flows. A temperature sensor and a humidity sensor are formed on an outer surface of the canister 41. And seven olfactory sensors 42 paired left, right, or up and down to form a parallel volatile organic compound detector. The method according to claim 2, Volatile organic compound detector, characterized in that for configuring the variable resistor (not shown) in each of the olfactory sensor 42, to adjust the output voltage according to the resistance of the olfactory sensor during the initial calibration.

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