JP2929761B2 - Gas in oil detector - 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-in-oil detector for measuring the concentration of dissolved gas in oil in an oil filling device using a gas sensor.

[0002]

2. Description of the Related Art In a gas-in-oil detecting device, the size of a gas extraction chamber such as a gas sensor chamber 3 and the like of a sample oil 2 contained in a sample oil chamber 1 is made equal, and the gas in the gas extraction chamber is sampled by an air pump 7. While extracting the gas in the sample oil 2 through the oil, the gas concentration is detected by the gas sensor and measured by the gas concentration indicator 4.

[0003]

The above-described conventional gas-in-oil detecting apparatus in which the size of a gas extraction chamber is the same as that of a sample oil is to measure near the zero point of a gas sensor when the amount of gas is small.

[0004] The accuracy of the gas sensor is over the entire measuring range,
It is about ± 10% of the full scale, and the error is large near the zero point. For this reason, there has been a defect that the measurement accuracy is not good and the measurement results vary widely.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to detect a gas concentration with high accuracy near a full scale of a gas sensor and obtain a gas-in-oil gas. It is an object of the present invention to provide an oil-in-oil gas detecting device for accurately measuring the concentration.

[0006]

In order to achieve the above object, the present invention provides a gas-in-oil detecting apparatus in which a gas extraction chamber including a gas sensor chamber is connected to a sample oil container, and gas is supplied to the sample oil by an air pump. And measuring the gas concentration with a gas concentration indicator connected to the gas sensor while extracting the gas by circulating the gas through the gas sensor chamber, wherein the size of the gas extraction chamber is の of the sample oil amount. ~ 1 /
4 and an arithmetic unit for multiplying the measured value of the gas concentration indicator by the ratio of the gas extraction chamber and the amount of the sample oil is provided.

[0007]

[Function] The size of the gas extraction chamber is set to 1/2 to 1/1 /
If it is 4, the gas concentration in the gas extraction chamber will be 1/2 to 1/4 times. For this reason, even if the gas concentration in the oil is low, the gas sensor can accurately detect near the full scale with high accuracy. Then, if the output value of the gas concentration indicator connected to the gas sensor is multiplied by the ratio of the size of the gas extraction chamber to the amount of the sample oil using an arithmetic unit, the ratio between the gas extraction chamber and the sample oil is calculated. It can be converted to an oil concentration of 1: 1. Therefore, a low gas concentration in oil can be accurately measured.

[0008]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an apparatus for detecting gas in oil. The same components as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof will not be repeated.

[0010] In FIG. 1, 3 ₁ of the gas sensor chamber such as a gas extraction chamber to the sample oil 2 size gas sensor chambers made to be 1/3, 5 the output of the gas concentration indicator 4 An A / D converter 6 for converting to a digital signal is a CPU for multiplying a gas concentration measurement value measured by a gas concentration indicator connected to the A / D converter 4 by 1/3 and outputting the result.

As described above, since the gas extraction chamber is reduced to 1/3 of the sample oil and the measurement is performed at a position close to the full scale of the gas sensor, the gas concentration can be detected accurately.

In the above embodiment, the size of the gas extraction chamber is set to 1/3 of the sample oil, and the measured value of the gas concentration indicator is set to 1 by the CPU.
However, the size of the gas extraction chamber is 1 /
2, 1/3, 1/4, etc., and reduce the measured value of the gas concentration indicator to 1/2, 1
/ 3, 1/4 times.

[0013]

The present invention is constructed as described above, so that the extraction gas chamber can be made smaller with respect to the sample oil and the gas can be measured as altitude. Since the measurement can be performed, the measurement can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing an apparatus for measuring a gas concentration in oil according to an embodiment of the present invention.

FIG. 2 is a configuration explanatory view showing a conventional gas concentration measurement device in oil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sample oil container 2 ... Sample oil 3, 3 ₁ ... Gas sensor room 4 ... Gas concentration indicator 5 ... D / A converter 6 ... CPU 7 ... Air pump

Claims (1)

(57) [Claims] 1. A gas extraction chamber including a gas sensor chamber is connected to a sample oil container, and the gas is circulated by an air pump so as to pass through the sample oil and the gas sensor chamber, thereby extracting the gas and controlling the gas concentration to the gas sensor. In the measurement using a connected gas concentration indicator, the size of the gas extraction chamber is set to 1/2 to 1/4 of the amount of the sample oil, and the measured value of the gas concentration indicator is used to measure the size of the gas extraction chamber and the sample. A gas-in-oil detection device comprising an arithmetic unit for multiplying a ratio of an oil amount.