JPS61266953A - Gas concentration detector - Google Patents

Abstract

PURPOSE:To obtain a small-sized gas concn. detector having simple constitution without using gas having 100% concn. by constituting one of electrodes of a metal having the same kind of ions as a solid electrolyte. CONSTITUTION:The solid electrolyte 5 is inserted into a cylinder 7 and the solid electrolyte 5 is sandwiched by two electrodes 6, 8. Pt is used form the electrode 6 on the side of the gas to be measured and the metal having the same kind of ions as the solid electrolyte 5 calculated in the gas to be measured is used for the other electrode 8. The solid electrolyte 5 is lead chloride and the metal of lead is used for the electrode 8 if the gas to be measured is gaseous chlorine. Pure gas of 100% is supplied on the supply side of the gas to be measure prior to the use in such constitution and a calibration is preliminarily made in an arithmetic circuit 3 by using the electromotive force generated in the solid electrolyte 5 by such supply. The electromotive force generated by the gas to be measured is thereafter subjected to concn. conversion by the calibrated arithmetic circuit 4.

Description

TECHNICAL FIELD The present invention relates to a gas concentration detection device, and more particularly to a gas concentration detection device for detecting the concentration of gas contained in the atmosphere.

Wataru Yoshimi Conventionally, gas sensors using solid electrolytes are used as gas concentration batteries, so 100% concentration gas is constantly supplied to one electrode with the solid electrolyte sandwiched between them, and the detection signal is supplied to the other electrode. The concentration of the gas to be measured is calculated using the Nernst equation from the electromotive force of the solid electrolyte generated due to the concentration difference.

In a gas concentration detection device having such a configuration, it is necessary to constantly supply 100% concentration gas to one electrode, which has the disadvantage that the device itself becomes complicated and large. Furthermore, the gas adsorption phenomenon makes it difficult to accurately measure the electromotive force in the solid electrolyte, so there is also the drawback that the gas concentration cannot be directly read.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas concentration detection device that is small and has a simple configuration without using 100% concentration gas.

The gas concentration detection device according to the present invention has a solid electrolyte sandwiched between two electrodes, and a gas to be measured is supplied to one of the electrodes.
The target is a gas concentration detection device that detects the concentration of a gas to be measured by the potential difference generated between these two electrodes, and its characteristics are that the other of the two electrodes is
1fH&-+ noodles in that it is made of a metal containing the same type of ions as the solid electrolyte.

1 pho 1 Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing the configuration of a gas concentration detection device according to an embodiment of the present invention, in which a gas sensor 1 generates an electromotive force corresponding to the concentration of a gas to be measured, and a voltmeter 2 measures the electromotive force. be done. Then, the calculation circuit 2 calculates the concentration corresponding to this electromotive force using Nernst's equation,
The calculated concentration is visually displayed on the monitor 4.

FIG. 2 is a sectional view showing an example of the configuration of the gas sensor 1 shown in FIG. 1. In the figure, a solid electrolyte 5 is inserted into a cylinder 7,
This solid electrolyte 5 is sandwiched between two electrodes 6°8. As the electrode 6 on the gas to be measured side, P is used as in the conventional case.
As the other electrode 8, a metal having the same type of ions as the solid electrolyte 5 fired in the gas to be measured is used. If the gas to be measured is, for example, chlorine gas, the solid electrolyte 5 is lead chloride, and the electrode 8 is made of lead metal.

Note that 7a is a cylindrical portion for introducing the gas to be measured, and 9.degree. 9a is a lead wire.

In such a configuration, 10
0% pure gas is supplied, and the calculation circuit 3 uses the electromotive force generated in the solid electrolyte 5 to perform calibration. Thereafter, without supplying 100% concentration gas, the electromotive force generated by the gas to be measured is converted into concentration using the thus calibrated arithmetic circuit 4.

1. As mentioned above, according to the present invention, it is no longer necessary to constantly supply 100% pure gas, which makes it possible to simplify and downsize the device, and to prevent the occurrence of 100% gas adsorption. This has the effect of being able to prevent power deterioration and accurately detecting the concentration of the gas to be measured.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of an embodiment of the present invention, and FIG. 2 is a sectional view of an example of the configuration of a gas sensor section used in the present invention. Explanation of symbols of main parts 5...Solid electrolyte 6.8...Electrode

Claims (1)

[Claims] A gas concentration detecting device in which a solid electrolyte is sandwiched between two electrodes, a gas to be measured is supplied to one electrode, and the concentration of the gas to be measured is detected by a potential difference generated between the two electrodes. A gas concentration detection device characterized in that the other electrode is made of a metal containing ions of the same type as the solid electrolyte.