TW201715230A - A kind of hydrocarbon gas sensor - Google Patents

Abstract

This innovation is regarded to a kind of hydrocarbon gas sensor which consists of control electrical circuits, displays, sensing, alert, and power modules and is able to sensing at room temperature and high temperature. The sensor is able to absorbing hydrocarbon gas by oversaturated carbon and sensing hydrocarbon gas.

Description

Carbon hydrogen sensor

The present invention relates to a sensor capable of performing carbon and hydrogen sensing at room temperature and high temperature, comprising: a control circuit module, a display module, a sensing module, a warning module and a power module, which are supersaturated. Carbon adsorption of carbon and hydrogen.

Generally, conventional gas sensors can be classified into semiconductor type, catalytic combustion type, electrochemical type, and infrared sensing type according to the principle of action.

The semiconductor type is sintered into an N-type semiconductor by using a metal oxide material, and the platinum wire is internally wound as a sensor and heated to 300 ° C. When there is only pure oxygen in the air, the negative ions generated by the oxygen contact are equal to the negative ions of the N-type semiconductor. The impedance is large and it is not easy to conduct electricity. When the air touches the flammable or toxic substances, the concentration of the opposite sex is large, the oxygen is reduced, the negative ions are relatively reduced, the impedance is reduced, the conductivity is easy, the electron flow is formed, and the electron flow is detected. The intensity can be known as the concentration.

Catalyst combustion type uses the amount of combustion to measure the gas concentration. The ruthenium fiber former is used to wind the platinum electric heating wire. The diameter of the hot wire is generally about 0.03mm, a certain length, and then the aluminum alloy is poured into the shape of the bead. The medium comes in contact with the heat of the peripheral air. When the platinum wire is supplied with a certain current of about 200-300 mA, its resistance is about 2-30 ohms. When the voltage is about 1.5~5.0V, it is about 300~500°C to maintain a certain temperature to help the reaction. When in the air At the time, certain oxygen will maintain a certain current. When the air is mixed with the flammable gas, the flammable gas is oxidized and contacted with the catalyst to generate combustion heat, which causes the surface temperature of the platinum wire to rise. Due to the metal characteristics, the higher the temperature, the greater the resistance, and the current is relatively reduced. Therefore, using the Wheatstone bridge to measure the change of the minimum resistance and amplifying it, the concentration of the flammable gas can be obtained.

The electrochemical type uses the diaphragm electrode type as an example. The principle of the diaphragm electrode is to measure the oxygen inventory by changing the pH value of the pH. The two electrodes are respectively immersed in the electrolyte, and passed through a 0.4mm Teflon sieve orifice membrane. As a dielectric diaphragm, the membrane has gas permeability, and the oxygen content in the air is small, and penetrates into the electrolyte to make the electrolyte produce acid. The change in alkali directly affects the hydrogen-oxygen molecule leaving the group, causing the current to form a loop, but this is a very small current. With a high-impedance amplifier, the signal can be amplified to identify the amount of oxygen. The main measurement is 0 ₂ , toxic Cl ₂ , NH ₃ , H ₂ S, etc.

Infrared sensing system uses any gas to generate temperature, displacement or frequency changes through energy excitation, and its orbit is regularly followed. For flammable gases, infrared radiation is used, and the degree of absorption by gas after irradiation comes. Judging whether there is any hydrocarbon content or not, when the wavelength absorption curve is studied, it can be qualitative or quantitative.

Among them, in infrared sensing applications suitable for hydrocarbon gas sensors, their quality is difficult to control due to their complicated system. In view of this, the creators of this case, together with their own creativity and continuous attempts, have developed a kind of room temperature and high temperature sensibility that can effectively improve and reduce this shortcoming, improve the shortcomings mentioned in the above-mentioned prior art. A sensor for measuring carbon and hydrogen.

The main purpose of the present invention is to provide a sensor for performing hydrocarbon sensing at room temperature and high temperature, comprising: a control circuit module 010, a display module 020, a sensing module 030, The warning module case 040 and the power module 050 are composed. Supersaturated carbon The adsorption of hydrogen, and the detection of hydrogen concentration by detecting the current time, the operation mode is different from the traditional sensing of carbon and hydrogen, and can quickly achieve the purpose of carbon and hydrogen sensing.

010‧‧‧Control circuit module

020‧‧‧Display module

030‧‧‧Sensor module

040‧‧‧Warning module

050‧‧‧Power Module

Figure 1 is a schematic diagram of the sensor of the present invention.

Figure 2 is a carbon/zinc composition diagram of the hydrogen sensing module component of the present invention. Carbon/zinc (C/Zn) values for different formulations. The ratio of oxalic acid C/Zn<2 is not saturated in the ratio (1:2), the oxalic acid C/Zn>2 obtained by the ratio (1:1) is supersaturated, and the oxalic acid C/Zn<2 obtained by the ratio (1:0.5) is not saturated.

Figure 3 shows the selectivity of various gases at normal temperature (25 ° C) and high temperature (150 ° C), with better selectivity for carbon and hydrogen.

Figure 4 is the recovery time for the creation of normal temperature (25 ° C) and high temperature (150 ° C).

In order to more clearly describe a sensor proposed by the present invention, a preferred embodiment of the present invention will be described in detail below with reference to the drawings. Please refer to FIG. 1 , which is a schematic diagram of a sensor, comprising: a control circuit module 010 , a display module 020 , a sensing module 030 , a warning module 040 and a power module 050 .

The process of the sensor of the present invention is as follows: zinc acetate is added to a methanol solution in proportion, zinc acetate methanol solution is disposed, and then a gel method is performed. In addition, the prepared reduced graphene oxide powder is added and shaken by an ultrasonic oscillator, and then centrifuged in a micro centrifuge to take out and clean. Then, the centrifuge is taken out and placed in an oven for a period of time, and finally the prepared oxalic acid powder is taken out, and then the thunder is taken. The film is condensed and formed into a film, and then combined with the circuit to perform various tests.

Please refer to Figure 2, which is the composition diagram of the sensing module of this creation. The energy divergence spectrometer (EDS) was used to analyze the elemental composition over a large area. EDS uses an electron beam to strike electrons from the inner layer of the element in the test piece, and backfills the electronic track by the outer layer of electrons, so that X-rays representing the characteristics of the element are emitted, and the characteristic X-ray is a high-energy electron. When an atom in a material is incident, low-level electrons are excited away from the nucleus, and high-energy electrons are backfilled to X-rays produced by low-level energy. The ratio of the RGO/ZnO ratio of the double precursor to the RGO/ZnO ratio (1:2); the RGO/ZnO ratio (1:1); and the ratio of the RGO/ZnO ratio (1:0.5) to prepare the carbon-containing oxalic acid.

Please refer to Fig. 3, which is the result of sensing the various gases of super-saturated carbon oxalic acid at room temperature (25oC). The carbon-hydrogen response increases obviously and continues to rise with time. However, there was no significant change for O2 oxygen and N2 nitrogen.

Please refer to Figure 4 for the recovery time diagram at room temperature (25 ° C) and high temperature (150 ° C). It can recover about 75% in tens of minutes at room temperature, and it can recover completely at high temperature.

The structure and characteristics of this creation have been described in detail above. It is known from this creation that the advantages of this creation are the ability to perform carbon and hydrogen sensing at room temperature and high temperature, and to quickly restore the original state. However, the above detailed description is intended to be illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. It is included in the patent scope of this case.

010‧‧‧Control circuit module

020‧‧‧Display module

030‧‧‧Sensor module

040‧‧‧Warning module

050‧‧‧Power Module

Claims (7)

A carbon hydrogen sensor comprises: a control circuit module, which is a control circuit module required for sensing; a display module for displaying sensing information; and a sensing module for sensing carbon Hydrogen sensing module; a warning module, which senses the concentration value of hydrocarbon molecules to a value, and provides a warning function; a power module provides the power required for the hydrogen sensor. Carbon-hydrogen sensing can be performed by adsorbing carbon and hydrogen with supersaturated carbon at room temperature. A carbon hydrogen sensor comprises: a control circuit module, which is a control circuit module required for sensing; a display module for displaying sensing information; and a sensing module for sensing carbon A sensing module for hydrogen; a warning module that senses a hydrogen concentration value up to a value and provides a warning function; and a power module that supplies the power required by the carbon-hydrogen sensor. Carbon and hydrogen gas can be adsorbed by supersaturated carbon at a high temperature to perform carbon hydrogen sensing. A carbon hydrogen sensor comprises: a control circuit module, which is a control circuit module required for sensing; a display module for displaying sensing information; and a sensing module for sensing carbon Hydrogen sensing module; a warning module, which senses the concentration value of hydrocarbon molecules to a value, and provides a warning function; a power module provides the power required for the carbon hydrogen sensor. Gas sensing is performed, and the gas content is calculated using the time at which the adsorption signal is generated. A carbon hydrogen sensing module is a sensing module for sensing carbon and hydrogen, which is an oxalic acid containing supersaturated carbon, which can sense carbon and hydrogen at room temperature. A carbon hydrogen sensing module is a sensing module for sensing hydrocarbon molecules, which is an oxalic acid containing supersaturated carbon, which can sense carbon and hydrogen at high temperatures. A carbon hydrogen sensing module powder is prepared by a sol-gel method, and is prepared by adding graphene oxide and zinc oxide double precursors in different proportions. A carbon hydrogen sensing module sensing film is prepared by a sol-gel method using graphene oxide and zinc oxide double precursors, and is prepared by adding in different proportions, and then processed into a film by laser.