KR100656412B1 - Apparatus of preparing moisturized standard gas for the calibration of gas detectors - Google Patents

Abstract

An apparatus for manufacturing a moisturized standard gas for calibration of a gas detector is provided to correct the moisture of the measured gas to obtain a reproducible measured value. An apparatus for manufacturing a moisturized standard gas for calibration of a gas detector includes a dried air quantity regulator and an injection opening(100), humidifying impingers(200,210), a standard gas flow quantity regulator and an injection opening(110), a mixing container(300), a second temperature regulator(610), and a calibrating humidification gas container(400), and a first temperature regulator(600). A humidification standard gas formed by mixing a humidified air and a standard gas in the mixing container is introduced into the calibrating humidification gas container.

Description

Apparatus of preparing moisturized standard gas for the calibration of gas detectors

1 is a schematic diagram of a state of calibrating a measuring instrument using a standard gas manufacturing apparatus for calibrating a gas meter manufactured according to the present invention,

Figure 2 is a detailed configuration of the humidification standard gas production apparatus for calibration gas meter according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: dry standard gas storage tank

2: dry air storage tank

4: gas meter to be calibrated

10: humidification standard gas manufacturing device for gas measuring instrument calibration

100: dry air flow regulator and inlet

110: dry standard gas flow regulator and inlet

200: humidifier impinger 1 210: humidification impinger 2

201: water refill container 1 211: water refill container 2

202: regulating valve 1 212: regulating valve 2

300: mixing standard dry gas and humidified air

400: calibration humidification standard gas container 401: calibration work tool

500: temperature and humidity display unit 501: temperature and humidity sensor

600: first temperature controller 601: temperature sensor 602: heater 603: heating metal 1

610: second temperature controller 611: temperature sensor 612: heater 613: heating metal body 2

The present invention relates to a humidification standard gas manufacturing apparatus for calibrating a gas meter, which minimizes an error due to moisture in a humidity condition similar to that of an atmospheric environment, and makes a standard gas atmosphere so that moisture correction of a measurement gas is performed so that a reproducible measurement value is obtained. It relates to a simulation apparatus.

There are so many kinds of dangerous gases in our living environment. Recently, gas accidents in homes, businesses, and construction sites, explosion accidents and pollution pollution in petroleum combinats, coal mines, chemical plants, etc. are being followed. Human sensory organs can hardly quantify the concentration of dangerous gases or determine the type of them. In order to cope with this, gas sensors using physical and chemical properties of materials have been developed and are commonly used for gas leakage detection, concentration measurement records, and alarms.

Gas meters used in the atmosphere include methane, ethane, propane and butane meters, or various gas meters such as hydrogen and halon meters, volatile organic compounds (VOC) meters, and malodorous gas meters. I'm measuring. Semiconductor gas sensors are widely used as gas sensors of the gas measuring device as described above, but various kinds of gas sensors having different principles are used.

In general, the semiconductor gas sensor which is widely used generally uses the change of electrical conductivity that occurs when the gas comes into contact with the ceramic semiconductor surface, and most of them are used by heating in the air, and thus metal oxides (ceramics) which are stable at high temperatures are mainly used. . Among the ceramic semiconductors, a semiconductor having thermally stable properties in the use temperature range due to its high electrical conductivity and high melting point has been used for the sensor. Since semiconductor gas sensors mostly respond to toxic gases and flammable gases, there are many kinds of gas that can be detected, easy to manufacture sensors, and simple configuration of detection circuits. However, the ceramic semiconductor gas sensor uses a reaction between the surface of the solid and the gas, and thus the speed at which the gas is adsorbed and the selectivity of the adsorbed gas are greatly influenced by not only the operating temperature of the sensor but also the atmosphere around the sensor. If the ambient temperature and humidity are changed while the power is still applied, the resistance value of the sensor is changed, and accordingly, the gas detection sensitivity is greatly changed. Because of the semiconductor sensor, the sensor resistance decreases at high temperatures, the sensor resistance increases at low temperatures, and the high-humidity condition for a long time increases the sensor resistance because the equilibrium adsorption concentration of OH ions due to moisture is higher than in the dry state. This results in inadequate measurement of the measurement gas.

In addition to semiconductor gas sensors, various gas sensors, such as a contact combustion gas sensor and a vibrator-type gas sensor, are used in gas measuring instruments, but most gas sensors have a characteristic of being affected by humidity. Therefore, it is necessary to calibrate the gas meter to accurately and reproducibly measure the concentration of the gas to be measured regardless of humidity or concentration in the temperature and humidity range of the atmospheric environment in which the actual gas sensor or gas meter operates.

However, since the standard gas for calibrating the gas meter is generally used as a simple dilution standard gas mixed with dry air and a dry standard gas to be measured, the measurement error due to moisture cannot be accurately corrected. Therefore, there is a need for a technique for manufacturing a standard gas containing moisture to correct the error due to moisture in manufacturing a standard gas for calibration of the gas meter.

Accordingly, it is an object of the present invention to provide a humidification standard gas production apparatus for calibrating a gas meter for accurately calibrating various gas meters used in an atmospheric environment.

In addition, the humidification standard gas production apparatus for calibration gas meter of the present invention is provided with a device that can control the humidity to correct the measurement error due to moisture in the air environment to minimize the measurement error according to the humidity of the gas meter more specific object have.

In order to achieve the above object, the present inventors have developed a device for producing a humidified standard gas having a humidity similar to that of an atmospheric environment by mixing and diluting a dry standard gas and humidified air.

The present invention relates to a humidification standard gas manufacturing apparatus for calibrating a gas meter, comprising a device for supplying moisture to supply moisture to dry air and mixing with a dry standard gas to humidify the gas meter at a similar humidity to the atmospheric environment. To a standard gas production apparatus.

Accordingly, the present invention provides a humidification standard gas production apparatus for calibrating a gas meter for calibrating the gas meter in a humidity condition similar to the atmospheric environment. Gas measuring instruments to which the humidification standard gas production apparatus for calibrating the gas measuring instrument of the present invention may be applied include a breathalyzer, a methane, ethane, propane and butane meter, a hydrogen and a halon meter, a volatile organic compound (VOC) meter, and the like.

Humidification standard gas production apparatus for calibration gas meter according to the present invention

A dry air flow controller and inlet for injecting dry air while controlling the flow rate from the dry air storage tank;

At least one series connected humidifying impinger for applying humidification to the dry air injected from the dry air flow regulator and the inlet to produce humidified air;

Standard gas flow regulator and inlet for injecting standard gas while adjusting the flow rate from the dry standard gas storage tank;

A mixing vessel in which humidified air discharged from the humidifying impinger and standard gas injected from the dry standard gas flow controller and the inlet are mixed;

A second temperature controller for controlling a temperature of the at least one humidifying impinger and the mixing vessel connected in series;

A humidification standard gas container for calibrating a humidification standard gas in which the humidifying air and the standard gas are mixed in the mixing container and connected through a calibration gas detector and a calibration tool; And

A first temperature controller for adjusting the temperature of the calibration humidification standard gas container;

Characterized in that comprises a.

Hereinafter, a humidification standard gas production apparatus for calibrating a gas meter according to the present invention will be described in detail with reference to the drawings. 2 shows a preferred example of the gas meter calibration humidification standard gas production apparatus according to the present invention, Figure 1 is a state of calibrating the meter using a gas meter calibration humidification standard gas production apparatus manufactured according to the present invention Schematic diagram.

Humidification standard gas production apparatus according to the present invention injects dry air from the dry air storage tank (2) to the humidifying impinger 200 through the dry air flow regulator and the inlet (100). The dry air introduced into the humidifying impinger 200 is introduced into another humidifying impinger 210 connected in series through water received in the humidifying impinger. The dry air passes through one or more humidifiers and becomes humidified air containing moisture. Water replenishing vessels 201 and 211 are connected to the humidifying impingers 200 and 210, respectively, to automatically replenish water through control valves 202 and 212 when water contained in the humidifying impinger is consumed. . One or more humidifier impingers are connected in series, and as the number of connected impingers increases, more moisture is contained in dry air. The dry air is converted into humidified air by passing through one or more series of humidifying impingers, and the humidifying air produced while passing through the humidifying impinger is introduced into the mixing vessel 300. The standard gas is injected from the dry standard gas storage tank 1 into the mixing vessel 300 through the standard gas flow controller and the inlet 110, and the humidified air and the dry standard gas are mixed in the mixing vessel to humidify the standard gas. Is made. The humidified standard gas is introduced into the calibration humidification standard gas container 400, and the calibration humidification standard gas container includes a calibration tool 401 that can be connected to the calibration gas detector 4. Humidification standard gas container is further provided with a temperature and humidity meter consisting of a temperature and humidity sensor 501 and a temperature and humidity display unit 500 to measure the temperature and humidity of the calibration humidification standard gas.

In addition, the humidification standard gas production apparatus according to the present invention includes a heater (612), a temperature sensor 611 and a second temperature controller (610) comprising a control unit (not shown) for controlling the heater through the temperature measured from the temperature sensor. It controls the temperature of one or more series of humidifying impinger and mixing vessel. The water and humidified air filled in the humidifying impinger are heated because the humidifying impinger is heated by the second thermostat while the dry air is introduced into the humidifying impinger and made into humidified air by the water contained in the humidifying impinger. All are heated by the thermostat to maintain a constant temperature. In addition, since the water filled in the humidifying impinger is heated by the second temperature controller, more moisture is contained in the dry air as it is heated due to a change in the vapor pressure of the water according to the temperature, and thus has a high humidity. In addition, the mixed container 300 in which the heated humidified air and the dry standard gas are mixed is also heated by the second temperature controller to prevent moisture from condensing due to a temperature drop when mixing with the dry standard gas.

Humidification standard gas produced in the mixing vessel is introduced into the calibration humidification standard gas storage container 400 is maintained at a constant temperature by the first temperature controller (600). The first temperature controller 600 includes a heater 602, a temperature sensor 601, and a controller (not shown) that controls the heater through a temperature measured from the temperature sensor.

The temperature of the calibration humidification standard gas is controlled by the first temperature controller, the concentration of the standard gas is controlled by the amount of standard gas injected and the amount of dry air, and the humidity of the calibration humidification standard gas is controlled by the second temperature controller. By changing the temperature of the water contained in the humidifying impinger can be adjusted by changing the amount of water evaporated.

The humidification standard gas manufacturing apparatus for calibrating a gas meter according to the present invention may manufacture a humidification standard gas having a change in concentration and humidity by using a dry standard gas of a component gas to be measured, and the standard dry gas used may include methane, ethane, Various aldehydes such as propane, butane, alcohol, halon and formaldehyde, acetaldehyde and benzene and styrene. Odors such as hydrogen sulfide, methyl mercaptan, ammonia, and volatile organic compound (VOC) component gases, but are not limited thereto.

As described above, the gas meter calibrating humidification standard value manufacturing apparatus according to the present invention may change the concentration and humidity of the standard gas in various ranges, and in particular, the standard gas component may be prepared by containing moisture in preparing a high concentration standard gas. Errors caused by adsorption with moisture can be corrected. In addition, there is an advantage that the gas meter can be calibrated under the humidity conditions of the atmospheric environment in which the gas meter to be calibrated actually operates. In addition, since the measurement error caused by moisture is generated in the gas meter, moisture, that is, humidity, is improved. The measurement error can be corrected so that the gas meter can be calibrated to produce a more accurate and accurate measurement value.

When the gas meter is calibrated using the humidification standard gas manufactured in the humidification standard gas manufacturing apparatus for calibrating the gas meter according to the present invention, humidity correction is performed so that a measurement error due to humidity does not occur in a range of humidity similar to the atmospheric environment. The advantage of having reproducible measurement values without measuring errors due to moisture and moisture is that it can be used in atmospheric environments, methane, ethane, propane and butane meters, or hydrogen and halon meters, and volatile organic compounds (VOC). ) It is used to calibrate various gas measuring instruments such as measuring instruments, odor gas component measuring instruments, and has the advantage of producing more accurate and accurate measured values.

Claims (5)

A dry air flow controller and inlet for injecting dry air while controlling the flow rate from the dry air storage tank; At least one series connected humidifying impinger for applying humidification to the dry air injected from the dry air flow regulator and the inlet to produce humidified air; A standard gas flow regulator and inlet for injecting standard gas while controlling the flow rate from the dry standard gas storage tank; A mixing vessel in which humidified air discharged from the humidifying impinger and standard gas injected from the standard gas flow controller and the inlet are mixed; A second temperature controller for controlling a temperature of the at least one humidifying impinger and the mixing vessel connected in series; A humidification standard gas container for calibrating a humidification standard gas in which the humidifying air and the standard gas are mixed in the mixing container and connected through a calibration gas detector and a calibration tool; And A first temperature controller for adjusting the temperature of the calibration humidification standard gas container; Humidification standard gas production apparatus for calibration gas meter, characterized in that comprises a. The method of claim 1, The first temperature controller and the second temperature controller comprises a temperature sensor, a heater and a control unit for controlling the heater by the temperature measured from the temperature sensor, characterized in that the calibration gas humidifier standard gas production apparatus. The method of claim 1, Humidification impinger is a humidifier standard gas production apparatus for calibration a gas meter, characterized in that the water replenisher is further provided. The method of claim 1, Humidification standard gas container for calibration calibration gas meter further comprises a temperature and humidity measuring instrument consisting of a temperature and humidity sensor and a temperature and humidity display. The method according to any one of claims 1 to 4, Moisture content of the calibration humidification standard gas is a gas meter calibration humidification standard gas production apparatus, characterized in that adjusted according to the temperature of the humidifying impinger.

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