JP3533802B2 - Gas detection device and oil type identification device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas detecting device for accurately detecting a plurality of test gases and a gas identifying device using the gas detecting device. Further, the present invention relates to an oil type identification device capable of identifying the type of oil in a fuel tank of a vehicle, for example, at a gas station, and more specifically, accurately identifying gasoline vapor, light oil vapor or air. The present invention relates to an oil type identification device that can be identified.

[0002]

2. Description of the Related Art First, an oil type identification device will be described. 2. Description of the Related Art In recent years, at gas stations such as gas stations, a multifunctional fuel dispenser capable of refueling both gasoline for gasoline vehicles and light oil for diesel vehicles by one unit has been used. When using such a refueling machine, it is necessary to avoid the situation of refueling gasoline and light oil by mistake. As a countermeasure, the vapor in the fuel tank of the vehicle to be refueled is sucked into the oil type identification device as the test gas, and the oil type identification device that identifies whether the test gas is gasoline vapor or light oil vapor is used. Development is in progress.

The difference in the vapor component in the fuel tank between a gasoline vehicle and a diesel vehicle lies in the gas concentration. Gasoline, which mainly contains low-boiling components, produces high-concentration steam in the fuel tank, while it has a boiling point of 100-200.
Light oil containing a large amount of ° C component generates extremely low concentration of steam in the fuel tank at room temperature. As a method of distinguishing two kinds of gas, a heat conduction type gas sensor using two heaters is known. The basic configuration and basic operation of the heat conduction type gas sensor will be described. For example, in the heat conduction type gas sensor, a first heater is provided in a closed space in which gasoline vapor is sealed as a reference gas (standard gas), and a second heater is provided in an atmosphere in which light oil vapor or gasoline vapor can come into contact. deep. A current of a predetermined value is supplied to the first heater to heat it and the output of the heater is detected. Further, the second heater is also supplied with a current having a predetermined value to heat the second heater and its output is detected. Since only the gasoline vapor comes into contact with the first heater, its output is constant. When gasoline vapor comes into contact with the second heater, the output of the second heater is the same as that of the first heater, but when light oil vapor comes into contact with the second heater, the output of the second heater is Different from the output of the first heater. Therefore, if the difference between the outputs of the two heaters is detected with gasoline vapor as the reference gas as a reference, it should be possible to identify whether the gas to be inspected (test gas) is gasoline vapor or light oil vapor. .

Further, it has been attempted to use ultrasonic waves for gas discrimination (for example, Japanese Patent Laid-Open No. 58-209242). When such an ultrasonic identification method is applied to an oil type identification device, oil vapor is sucked from the oil tank as a test gas and taken into the oil type identification device, and ultrasonic waves are applied to the aspirated gas to apply suction gas. Whether the test gas is gasoline vapor or light oil vapor is discriminated from the difference in the reflected wave based on the difference in the mass of.

[0005]

In order to identify a gasoline vehicle or a diesel vehicle from the vapor in the fuel tank at room temperature, a stable sensitivity to a gas having an extremely wide range of concentration of several hundred ppm to several tens% is obtained. A gas sensor with is required. However, the above-mentioned heat conduction type gas sensor is not yet sufficient for detecting such a wide range of gas. In particular, the detection accuracy (sensitivity) of low-concentration gas is not sufficient. The type of oil used in a refueling machine is usually the atmosphere (air).
Done in. However, since the concentration of light oil vapor is low,
In the heat conduction type gas identification method described above, it is difficult to identify whether the gas sucked into the fuel filler is light oil gas or air.

Since an expensive ultrasonic transmitter / receiver is used in the ultrasonic discriminating method, there is a problem that the price of the oil type discriminating device becomes high. Further, in the oil type identification device using the ultrasonic transmitter / receiver, the output is substantially the same when the test gas is air and when it is the vapor of light oil. Therefore, the test gas suction pump for sucking the vapor in the fuel tank as the test gas fails, the test gas suction nozzle is clogged, and the air is identified. In some cases, it may be incorrectly identified as a vapor of light oil.

Both the heat conduction type gas identification method and the ultrasonic identification method have the above-mentioned problems. As a result, there is a problem in that light oil may be supplied to the fuel tank of a gasoline vehicle or vice versa, regardless of the identification.

In the above, particularly, gasonline vapor, gas oil vapor, and air are identified as the gas (vapor). However, in addition to the above-mentioned example, the composition is similar and the identification is accurately performed. If you are also encountering similar issues as above.

The present invention distinguishes between three gases at low cost,
It is to provide a gas identification device that can be stably and accurately performed. Another object of the present invention is to provide, for example, a gas detection device that can be incorporated in a fuel dispenser and the like, and an oil type identification device that uses the gas detection device.

[0010]

According to the first aspect of the present invention,
In this case, the vibrating gas detector provided in the first space (20) into which the test gas such as gasoline vapor, light oil vapor, or air is introduced, and the crystal oscillator ( 62), an electrode (64) formed to make an electrical connection with the crystal unit, and the sample gas introduced into the first space to contact the crystal unit. A vibration type gas detection part having a gas adsorption film (66) formed by covering the electrodes and coated with an acetyl cellulose film, and a closed space (36) in which air is enclosed as a reference gas.
A first heat-conductivity-type gas detector for reference, which has a first heater (32) provided in the second heater, and a second heater provided in a second space (49) into which the test gas is introduced. (42)
And a difference between the detection output of the first heat conduction type gas detection unit and the detection output of the second heat conduction type gas detection unit is not less than a first predetermined value. And the output signal of the vibration type gas detection unit is equal to or higher than a second predetermined value, the test gas is identified as gasoline vapor, and the detection output of the first heat conduction type gas detection unit and the second heat conduction type are detected. When the difference from the detection output of the mold gas detection unit is less than or equal to the first predetermined value and the output signal of the vibration type gas detection unit is greater than or equal to the second predetermined value, the test gas is identified as light oil vapor. There is provided a gas detection device comprising: an identification unit (70) for identifying the test gas from air when the output signal of the vibration type gas detection unit is equal to or less than the second predetermined value.

The gas detection device of the present invention has two different principles.
Two detectors, that is, lower cost and lower concentration than the ultrasonic receiver.
Vibration type gas detector that also uses a vibrator that can identify the degree of gas
And a heat conduction type gas detector having a heat conduction type gas detector for reference.
It is composed by combining with the outlet. Vibration type gas detection
A crystal oscillator is used as the vibrating member of the section. Crystal vibration
Children are cheap and easy to handle. For refueling machine
If used, preferably the reference gas is air.
It This is to accurately distinguish between air and light oil vapor.

Preferably , the gas detection device is the above-mentioned gas to be detected.
The gas inlet for introducing the gas and the exhaust gas for exhausting the test gas.
With a container for defining the first space.
The vibration type part, the gas detection part, and the first heater.
And the second heater is provided in the container.
It

According to a second aspect of the present invention, gasoline vaporization
Introduction of test gas such as air, steam of light oil or air
The type of gas in the first space (20) to be detected is detected and
Oil type identification device for identifying the oil type of
Crystal oscillator (62) and electrical contact with the crystal oscillator
An electrode (64) formed to carry out
Contact the test gas introduced into the space with the crystal unit
An acetyl cell formed over the electrode to allow
Vibration having a gas adsorption film (66) coated with a loin film
Type gas detector and hermetically sealed with air as reference gas
Has a first heater (32) provided in the space (36)
A first heat conduction type gas detection unit for reference, and the test gas
The second space provided in the second space (49) into which the gas is introduced.
A second heat conduction type gas detection part having a heater (42);
The detection output of the first heat conduction type gas detection unit and the second
The difference from the detection output of the heat conduction type gas detection unit is less than the first predetermined value.
The output signal of the vibrating gas detector is above the second predetermined value.
At the above time, the test gas is identified as gasoline vapor, and
The detection output of the first heat conduction type gas detection unit and the second heat transfer
The difference from the detection output of the conductive gas detection unit is less than or equal to the first predetermined value.
And the output signal of the vibrating gas detector is below the second
When the gas is a predetermined value or more, the test gas is identified as light oil vapor,
The output signal of the vibrating gas detector is equal to or more than the second predetermined value.
In the case below, an identifying means (7) for identifying the test gas from air.
0) and the crystal unit (62) via the electrodes.
Oscillation circuit (63) that operates to oscillate the crystal unit
And via the electrode (64) of the vibrating gas detector
Detects the oscillation frequency of the crystal unit in contact with the test gas
And a first detection means for supplying power to the first heater.
1 power supply means (33) and the electrical output of the first heater
Second detecting means (35) for detecting
The second power supply means (43) for supplying power to the
The third detection means (45) for detecting the electrical output of the data
The identification means is provided with an output of the second detection means
The difference from the output of the third detecting means is equal to or more than the first predetermined value.
And the output of the first detection means is greater than or equal to the second predetermined value.
At this time, the test gas is identified as gasoline vapor, and the second gas
The difference between the output of the detection means of 1 and the output of the third detection means is
Output of the first detection means that is less than or equal to the first predetermined value
Is greater than or equal to the second predetermined value, the test gas is steamed with light oil.
And the output of the first detecting means is the second place.
An oil type identification device that identifies the test gas as air when the value is below a certain value.
Location is provided.

Preferably, a gas for introducing the test gas
Inlet part (12) and gas discharge part for discharging the test gas
A container (1) having (14) and defining the first space.
0), and the vibrating gas detector, the first heater
And the second heater is provided in the container.
The oscillation circuit, the first detection means, the first power supply means, the second detection means, the second power supply means,
The third detection means and the oil vapor identification means are provided outside the container.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the oil type identification device of the present invention will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 shows an oil type identification device according to a first embodiment of the present invention.
Will be described with reference to. The oil type identification device 1 of the first embodiment of the present invention includes a heat conduction type gas sensor 50, a crystal oscillator gas sensor 60, and an identification device 70. Thermal conductivity type gas sensor 5
Reference numeral 0 includes a reference unit 30 and a gas detection unit 40.

The oil type identification device container 10 includes a gas inlet 12
And a gas discharge part 14, and the vapor of the oil to be detected introduced from the gas inlet part 12 into the internal space (lumen), that is, the cavity (space) 20 inside the oil type identification device, that is, the test gas. Is introduced and discharged from the gas discharge part 14.

The detailed structures of the reference section 30 and the gas detection section 40 which constitute the heat conduction type gas sensor 50 will be described. Reference part 30
Has a reference heater 32 and a reference portion hermetically sealed container 34 provided in the oil type identification device internal cavity 20 that accommodates the reference heater 32 in a hermetically sealed state. Air as a reference gas (standard gas) is sealed at a predetermined pressure in the closed space, that is, the cavity 36 in the reference portion. Further, the reference portion 30 has an electrode terminal 38 for applying electricity to the reference heater 32 for heating, and the electrode terminal 38 penetrates the oil type identification device container 10 and is connected to the reference heater 32. ing. Reference part 30
Is a first power supply device 33 that heats the reference heater 32 by applying a voltage (current) to the outside of the oil type identification device container 10 via an electrode terminal 38, and the electrode terminal 3.
A second output detection device 35 for detecting the output of the reference heater 32 via 8 is provided. The electrode terminal 38 penetrates the oil type identification device container 10 and connects the first power supply device 33 and the second output detection device 35 provided outside the oil type identification device container 10 to the reference heater 32. ing.

The gas detector 40 is a heater 4 for gas detection.
2. It has a gas detection part container 44 that houses the gas detection heater 42. Hole 4 in the gas detector container 44
6 is provided so that the test gas introduced into the oil type identification device cavity 20 can contact the gas detection heater 42 in the gas detection unit 40. The gas detector 40 has a second power supply device 43 and an electrode terminal 48 for applying a voltage (flowing a current) from the second power supply device 43 to the gas detection heater 42 for heating. is doing. Furthermore, the gas detection unit 40 has a third output detection device 45 that detects the output of the gas detection heater 42 via the electrode terminal 48. The electrode terminal 48 penetrates through the oil type identification device container 10, and the gas detection heater 42 in the oil type identification device container 10, the second power supply device 43 and the third output outside the oil type identification device container 10. It is connected to the detection device 45.

The crystal oscillator gas sensor 60 comprises a crystal substrate 62, an electrode 64, a gas adsorption film 66, and an electrode terminal 68 which are housed in the oil type identification device cavity 20 of the oil type identification device container 10. The crystal oscillator gas sensor 60 has electrodes 64 formed on both sides of a crystal substrate 62, and the surface thereof is covered with a gas adsorption film 66. The crystal oscillator gas sensor 60 also includes an electrode terminal 68, an oscillation circuit 63, and a first output detection device 65. The electrode terminal 68 penetrates the oil type identification device container 10 and applies a voltage from the oscillation circuit 63 to the crystal substrate 62 via the electrode 64. The oscillator circuit 63 supplies electricity to the crystal substrate 62 and cooperates with the crystal substrate 62 to oscillate the crystal substrate 62. First
The output detection device 65 detects the vibration frequency of the crystal substrate 62. The electrode terminal 68 penetrates the oil type identification device container 10, and the electrode 64 and the crystal substrate 62 provided in the oil type identification device internal cavity 20 of the oil type identification device container 10 are provided outside the oil type identification device container 10. The oscillation circuit 63 and the first output detection device 65 thus connected are connected.

The discriminating device 70 is composed of, for example, a microcomputer, and judges the outputs of the second output detecting device 35, the third output detecting device 45 and the first output detecting device 65 to discriminate the oil type. The test gas introduced into the cavity 20 in the oil type identification device of the container 10 is identified. Details of this identification method will be described later.

The operation of the oil type identification device shown in FIG. 1 will be described. Since air as a reference gas is sealed in the reference portion cavity 36 of the operation reference portion 30 of the heat conduction type gas sensor 50 , a predetermined voltage (reference voltage) is applied to the reference heater 32 from the first power feeding device 33 via the electrode terminal 38. When the electric current is supplied, the reference heater 32 is constant regardless of the presence or absence of the test gas introduced into the oil type identification device cavity 20 and its amount. The reference heater 32
Can be detected by the second output detection device 35. The gas to be detected introduced into the cavity 20 inside the oil type identification device is introduced into the cavity 49 inside the detection section of the gas detection section 40 and comes into contact with the heater 42 for gas detection. As a result, even if the same voltage (or current) as that applied to the reference heater 32 is supplied from the second power feeding device 43, the cavity 4 in the detection unit 4
The gas detection heater 42 that is detected by the third output detection device 45 according to the type and concentration of the test gas introduced into
Output changes. In the identification device 70, the difference between the output of the second output detection device 35 that detects the output of the reference heater 32 and the output of the third output detection device 45 that detects the output of the gas detection heater 42 The existence of

When the test gas introduced into the operating oil type identification device cavity 20 of the crystal oscillator gas sensor 60 is adsorbed by the gas adsorption film 66 of the crystal substrate 62, the mass of the crystal substrate 62 changes, so that it is adsorbed. The vibration frequency of the quartz substrate 62 that cooperates with the oscillation circuit 63 changes in proportion to the mass of the test gas. When the first output detection device 65 connected to the electrode terminal 68 detects the frequency or frequency change, the existence of the test gas can be known.

The principle of discriminating the type of the test gas in the discriminating device 70 as a result of using the two sensors of the heat conduction type gas sensor 50 and the crystal oscillator gas sensor 60 having different operation principles will be described. The heat conduction type gas sensor 50 including the reference unit 30 and the gas detection unit 40 has a linear characteristic with respect to the test gas having a relatively high concentration of about several% to several tens%. On the other hand, the crystal oscillator gas sensor 60 has a characteristic of being able to detect a test gas having a low concentration of several thousand ppm or less. The difference between the components of gasoline vapor and light oil vapor lies in their gas concentrations. Gasoline, which mainly contains low boiling point components, produces a high concentration of steam in the fuel tank, but light oil containing components with a boiling point of 100 to 200 ° C produces extremely low concentrations of vapor at room temperature, which results in heat conduction. It is difficult for the type gas sensor 50 to distinguish between light oil vapor and air. In order to distinguish between gasoline and light oil from the vapor component in the vehicle's fuel tank, a gas sensor with stable sensitivity that can reliably identify gas concentrations in a wide range of several hundred ppm to several tens of percent, That is, it is desirable to detect with the heat conduction type gas sensor 50. On the other hand, it is desirable to use the crystal oscillator gas sensor 60 for distinguishing low concentration test gas such as light oil vapor from air. That is, in the present invention, by combining the heat conduction type gas sensor 50 and the crystal oscillator gas sensor 60, gasoline vapor and light oil vapor are accurately identified, and light oil vapor and air are also identified.

The above operation will be described with reference to FIGS. The identification device 70 identifies the test gas according to the following table.

Table 1 Output difference between the output of the second output detector 35 and the output of the first output detector 65 and the output of the third output detector 45 Above a certain level Above a certain level Gasoline vapor Below a certain level Above a certain level Light oil vapor Below a certain level Below a certain level Air

The operation of the identification device 70 will be described below. The identification device 70, as shown in FIG.
The output of the second output detection device 35 connected to the reference heater 32 of the reference unit 30 of 0 and the output of the third output detection device 45 connected to the gas detection heater 42 of the gas detection unit 40. When the difference is equal to or higher than a predetermined level and the output of the first output detection device 65 of the crystal oscillator gas sensor 60 is equal to or higher than the predetermined level, the test gas introduced into the oil type identification device internal cavity 20 is gasoline vapor. To identify. As shown in FIG. 3, the identification device 70 includes an output of the second output detection device 35 connected to the reference heater 32 of the reference part 30 of the heat conduction type gas sensor 50 and a gas detection heater of the gas detection part 40. When the difference from the output of the third output detection device 45 connected to 42 is small, and the crystal oscillator gas sensor 60
If the output of the first output detection device 65 is higher than a predetermined level, it is identified as light oil vapor. The identification device 70 is shown in FIG.
As shown in, the second output detection device 35 connected to the reference heater 32 of the reference portion 30 of the heat conduction type gas sensor 50.
And the output of the third output detector 45 connected to the gas detection heater 42 of the gas detector 40 is small, and the output of the first output detector 65 of the crystal oscillator gas sensor 60 is small. Is also low, the test gas is identified as air. As described above, by combining the output of the heat conduction type gas sensor 50 and the output of the crystal oscillator gas sensor 60, the test gas can be accurately identified.

Experimental Example As the heat conduction type gas sensor 50, the applied current to the reference heater 32 by the first power feeding device 33 was set to 8 mA. A quartz substrate of the oscillation frequency 10 MHz _Z in AT-cut as quartz substrate 62 of the crystal resonator gas sensor 60, the acetyl cellulose film is applied as a gas adsorption film 66, the quartz substrate 6
2 and a C-MOS as an oscillation circuit 63 that constitutes an oscillation circuit.
A Colpitts oscillator circuit using an inverter was used. The results measured under the above conditions, in particular, the scale are shown in FIGS. As is clear from the diagrams of FIGS. 2 to 4, the output difference is remarkable. In other words, the identification of the test gas is clear. Therefore, it is possible to accurately and stably identify the test gas. The identifying device 70 determines that the output voltage of the second output detecting device 35, the third output detecting device 45, and the first output detecting device 65 is 0.
Identify with 5V or less. In particular, according to this embodiment,
Not only the gasoline vapor and the light oil vapor can be distinguished, but also the air as the test gas and the light oil gas can be accurately distinguished.

According to the oil type identification device 1 of this embodiment, it is possible to accurately identify whether the test gas is gasoline vapor, light oil vapor or air. Therefore, when the oil type identification device 1 is used as a vehicle oil type identification device, the test gas suction pump for sucking the vapor in the fuel tank as the test gas fails, or the test gas suction nozzle is not visible. Even if an abnormal situation such as clogging occurs and the air is identified, the test gas is not mistakenly identified as the vapor of light oil. As a result, even if such an abnormal situation occurs,
It is possible to avoid filling the fuel tank of a gasoline vehicle with light oil. Further, according to the oil type identification device 1 of the present embodiment, it is not necessary to use an expensive ultrasonic transmitter / receiver, and the cost of the device can be reduced.

Modification of First Embodiment The oscillation circuit of the crystal oscillator gas sensor 60 is not limited to the Colpitts type oscillation circuit described above, but various other well-known oscillation circuits,
For example, a Hartley oscillator circuit or the like can be used. The first power supply device 33 and the second power supply device 43 can be integrated. In addition, the second output detection device 35, the third output detection device 45, the first output detection device 6
5 and the identification device 70 can be integrally configured by using a microcomputer or the like.

The oil type identification device 1 shown in FIG. 1 has a structure and a structure suitable for being incorporated in a fuel dispenser. That is, the oil type identification device container 10 accommodates the minimum necessary components, that is, the reference unit 30, the gas detection unit 40, and the crystal oscillator gas sensor 60. Oil type identification device container 10
The size of the oil type identification device container 10 can be reduced because the number of components contained therein is minimum. Of course, the reference part 30 which does not need to be brought into contact with the test gas can be provided outside the oil type identification device container 10. These can be used only as a gas detection device. Of course, if an appropriate standard gas is stored in the reference-portion cavity 36 in the reference heater 32 of the reference unit 30, it can be used for other gas identification by gas comparison with the standard gas as a reference. The first power supply device 33, the second output detection device 35, the second power supply device 43, the third output detection device 45, the oscillation circuit 63, the first output detection device 65 and the identification device 70 are oil type identification devices. It is provided outside the container 10. These can be provided at any part if only the wiring is considered.

[0031]

[Embodiment 2] In the oil type identification apparatus of the first embodiment, the crystal oscillator gas sensor 60 is used to identify low-concentration light oil vapor, but not limited to the crystal oscillator, the test gas adheres. Therefore, another oscillation element (vibrator) whose mass changes and whose oscillation frequency changes can be used. Transducers are cheaper and smaller in size than ultrasonic receivers. Further, the first output detection device 65 is suitable for forming an oscillation circuit that oscillates in cooperation.

[0032]

As described above, according to the oil type identification device of the present invention,
It is possible to accurately identify whether the test gas is gasoline vapor, light oil vapor or air from the output patterns of the heat conduction type gas sensor and the crystal oscillator gas sensor. for that reason,
If the oil type identifying device of the present invention is used in a fueling machine at a gas station, it is possible to avoid supplying wrong oil to a vehicle. Further, according to the oil type identifying apparatus and the method thereof of the present invention, it is not necessary to use an expensive ultrasonic transmitter / receiver, and the cost of the apparatus can be reduced.

The gas detection device of the present invention can be applied to various gas identification devices other than the above-described oil type identification device. In that case, the standard gas (reference gas) is appropriately selected.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of an oil type identification device of the present invention.

2 is a first characteristic diagram showing identification of a test gas by the oil type identification device shown in FIG. 1. FIG.

FIG. 3 is a second characteristic diagram showing identification of a test gas by the oil type identification device shown in FIG.

4 is a third characteristic diagram showing identification of a test gas by the oil type identification device shown in FIG. 1. FIG.

[Explanation of symbols]

1 .. Oil type identification device 10 ... Oil type identification device container 12 ... Gas inlet 14 ... Gas discharge section 20 .. Cavity inside oil type identification device 30 ... Reference section 32 .. Reference heater 33 .. First power supply device 34 .. Reference part closed container 35..Second output detection device 36 .. Cavity in reference part 38..Electrode terminals 40 .. Gas detector 42 .. Gas detection heater 43 ... Second power supply device 44 .. Gas detector container 45 .. Third output detection device 46 ... holes 48 ... Electrode terminals 49 .. Cavity inside detector 50 ··· Thermally conductive gas sensor 60 ... Crystal oscillator gas sensor 62 .. Crystal substrate 63..Oscillation circuit 64 ... Electrode 65..First output detection device 66 .. Gas adsorption film 68..Electrode terminals 70..Identification device

Continuation of front page (56) Reference JP-A-5-312707 (JP, A) JP-A-7-260773 (JP, A) JP-A-5-281120 (JP, A) JP-A-5-312708 (JP , A) JP-A-7-134111 (JP, A) JP-A-2-231548 (JP, A) Fukuikaihei 6-40853 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) G01N 27/00-27/24 G01N 33/00-33/46 G01N 5/02

Claims (4)

(57) [Claims] 1. A vibrating gas detector provided in a first space (20) into which a test gas such as gasoline vapor, light oil vapor or air is introduced, and a quartz vibration as a vibrating member. a child (62), a formed electrode (64) to perform the crystal oscillator and electrical connection, contacting the pre-Symbol test gas introduced into the first space to said crystal oscillator covering said electrode is formed so as to, have a gas adsorption film coated with acetylcellulose membrane (66)
A first reference unit having a vibrating gas detection unit and a first heater (32) provided in a closed space (36) in which air is sealed as a reference gas.
A heat conduction type gas detection part, a second heat conduction type gas detection part having a second heater (42) provided in a second space (49) into which the test gas is introduced, and The difference between the detection output of the first heat conduction type gas detection unit and the detection output of the second heat conduction type gas detection unit is a first predetermined value or more, and the output signal of the vibration type gas detection unit is the second. When the gas is above a predetermined level, the test gas is identified as gasoline vapor, and the difference between the detection output of the first heat conduction type gas detection unit and the detection output of the second heat conduction type gas detection unit is the first. When the output signal of the vibration type gas detection unit is equal to or lower than a predetermined value and is equal to or higher than the second predetermined value, the test gas is identified as light oil vapor,
A discriminating means (7) for discriminating the test gas from air when the output signal of the vibrating gas detector is equal to or less than the second predetermined value.
0) and a gas detector. 2. A gas inlet part (1) for introducing the test gas.
2) and a gas discharge part (14) for discharging the test gas, and a container (10) defining the first space, the vibration type gas detection part, the first heater, and , The second heater is provided in the container.
The gas detector described. 3. Gasoline vapor, light oil vapor or air barrier
In the first space (20) into which a slight amount of test gas is introduced
Oil type identification device that detects the type of gas and identifies the oil type
And a crystal unit (62) as a vibrating member, and an electric circuit formed to electrically connect to the crystal unit.
The pole (64) and the test gas introduced into the first space are mixed with the quartz crystal.
An electrode formed over the electrode to contact the pendulum.
Has a gas adsorption film (66) coated with a cetyl cellulose film.
The vibration type gas detector and the closed space (36) in which air is enclosed as a reference gas are installed.
First reference, with first heater (32) worn
The heat-conducting gas detector of the above and the second space (49) into which the test gas is introduced are provided.
Second heat-conducting gas having a second heater (42)
A detection unit, the detection output of the first heat conduction type gas detection unit, and the second output.
The difference from the detection output of the heat conduction type gas detection unit is less than the first predetermined value.
The output signal of the vibrating gas detector is above the second predetermined value.
At the above time, the test gas is identified as gasoline vapor, and
The detection output of the first heat conduction type gas detection unit and the second heat transfer
The difference from the detection output of the conductive gas detection unit is less than or equal to the first predetermined value.
And the output signal of the vibrating gas detector is below the second
When the gas is a predetermined value or more, the test gas is identified as light oil vapor,
The output signal of the vibrating gas detector is equal to or more than the second predetermined value.
In the case below, an identifying means (7) for identifying the test gas from air.
0), an oscillating circuit (63) that oscillates the crystal unit in cooperation with the crystal unit (62) via the electrode, and the electrode (64) of the vibrating gas detector through the electrode (64). First detection means for detecting the oscillation frequency of the crystal resonator in contact with the test gas, and first power supply means (33) for supplying power to the first heater.
A second detection means (35) for detecting an electric output of the first heater; and a second power supply means (43) for supplying power to the second heater.
And a third detecting means (45) for detecting an electric output of the second heater, wherein the identifying means includes the output of the second detecting means and the third detecting means (45).
When the difference from the output of the detecting means is greater than or equal to the first predetermined value and the output of the first detecting means is greater than or equal to the second predetermined value, the test gas is identified as gasoline vapor, and the second When the difference between the output of the detection means and the output of the third detection means is less than or equal to the first predetermined value and the output of the first detection means is greater than or equal to the second predetermined value, the test gas is light oil. An oil type identification device that identifies the test gas as air when the output of the first detection unit is equal to or less than the second predetermined value. 4. A gas inlet part (1) for introducing the test gas.
2) and a gas discharge part (14) for discharging the test gas
And having a container (10) defining the first space, the vibration-type gas detection unit, the first heater, and the front.
A second heater is provided in the container, and the oscillation circuit, the first detection means, the first power supply means, the second detection means, the second power supply means, the third power supply means. The oil type identification device according to claim 3 , wherein the detection means and the oil vapor identification means are provided outside the container.