An intelligent methane full-scale sensor and its full-scale methane concentration measurement method

Abstract

The invention discloses an intelligent methane full-range sensor and a full-range methane concentration measurement method of the intelligent methane full-range sensor. The intelligent methane full-range sensor comprises a four-wire socket, a bridge working power supply, a weak-current circuit power supply, a communication interface circuit, a methane bridge operating circuit, a singlechip circuit and an ambient temperature measuring circuit, wherein two power lines of the four-wire socket are connected with the bridge working power supply; the weak-current circuit power supply is connected with the bridge working power supply; two communication lines of the four-wire socket are I2C communication lines and are connected with the communication interface circuit; the communication interface circuit is connected with the singlechip circuit; an EEPROM storage is contained in a singlechip STM32L151C8 in the singlechip circuit and is used for storing operating parameters and set I2C address of the sensor; the needed DAC, ADC and I2C peripherals are integrated on the singlechip; and the methane bridge operating circuit and the ambient temperature measuring circuit are respectively connected with the singlechip circuit. According to the intelligent methane full-range sensor, the full-range methane concentration measurement can be realized, field correction is not needed, a communication interface connected with the outside is an I2C interface, and the sensor is convenient to use.

Description

technical field [0001] The invention relates to the technical field of smart sensors, in particular to an smart methane full-range sensor and a full-range methane concentration measurement method thereof. Background technique [0002] The measurement of methane concentration is very important for the coal and petrochemical industries, and the main measurement method at present is the catalytic combustion method. The detection element of catalytic combustion is composed of platinum resistance black element and platinum resistance white element in series. The surface of the black element contains catalyst. After the detection element is heated to a high temperature of about 400°C by electric heating, if there is methane gas around the black element, methane will be produced. Flameless catalytic combustion and release of heat, the heat will further increase the resistance value of the black element. The rise of the resistance value of the black element is proportional to the c...

AI Technical Summary

Problems solved by technology

The combination sensor switches between the catalytic element and the heat conduction element when it is working. This method can partially solve the problem of full-scale measurement, but there are still problems with the smooth transition of the two measurement elements when switching, and even double-value problems. At the same time, due to the lack of catalytic combustion black The temperature control mechanism of the element, the temperature is still high during catalytic combustion, which shortens the service life of the entire sensor

In addition, the general methane analog sensor needs to be used in conjunction with a dedicated transmitter, which does not provide a general digital communication interface

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