Explosion-proof-type zirconia probe

Abstract

The invention provides an explosion-proof-type zirconia probe which is mainly structurally composed of eight parts: a limiting-current-type zirconia sensor, a gas interchanger, a heat tracing device, a filtering device, a transition lead, a protective casing with a flange, a scale gas connecting element and an explosion-proof terminal box, wherein the gas interchanger is internally provided with the limiting-current-type zirconia sensor, and is externally provided with the heat tracing device; outgoing lines of the limiting-current-type zirconia sensor and the heat tracing device are connected with one end of the transition lead, and the other end of the transition lead is connected with the explosion-proof terminal box; the limiting-current-type zirconia sensor, the gas interchanger and the heat tracing device are all arranged in the filtering device; the filtering device is connected with one end of the protective casing with a flange; and the scale gas connecting element is used for being connected with the protective casing with a flange and the explosion-proof terminal box and is communicated with the limiting-current-type zirconia sensor through the scale gas connecting element. Because a reference gas is not required to be introduced in detection, compared with the traditional explosion-proof-type zirconia probe, the explosion-proof-type zirconia probe is safer, and can realize online calibration at the same time.

Description

technical field [0001] The invention relates to an explosion-proof zirconia probe. Background technique [0002] The traditional explosion-proof zirconia probe uses a potentiometric zirconia sensor. The application principle is that at a certain temperature, when there is oxygen on both sides of the sensor that does not need to be divided, the voltage on both sides of the sensor In the formula: R-gas constant; T-thermodynamic temperature; F-Faraday's constant; Partial pressure of oxygen in the mixture; P A - the partial pressure of oxygen in the reference gas. [0003] When the temperature is constant, since the oxygen concentration of the reference gas is known, the oxygen concentration of the measured gas can be measured. Generally, air is used as the reference gas, and its value is 20.6%. The measurement process must ensure that the reference gas always exists, and in order to meet the explosion-proof requirements, the air in the non-hazardous place is led to the re...

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Problems solved by technology

The measurement process must ensure that the reference gas always exists, and in order to meet the explosion-proof requirements, the air in the non-hazardous place is led to the reference gas side of the explosion-proof zirconia sensor by laying pipelines. This method is not only used when the equipment system is initially installed. Time-consuming and labor-intensive, it is necessary to install and lay the air guide line, and ensure that the laid air guide line and other pipe fittings strictly meet the explosion-proof requirements in terms of application, and it also brings inconvenience to the subsequent maintenance and repair process, making the installation process and maintenance work complicated change

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