Principle and Application of Zirconia Oxygen Sensor

Abstract: The principle and application information of zirconia oxygen sensor are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. *The working principle of some zirconia oxygen sensors 1. Product introduction: The zirconia oxygen sensor uses zirconia ceramic sensitive elements to measure the oxygen potential in various heating furnaces or exhaust pipes, and calculates the corresponding oxygen concentration by the chemical balance principle to achieve monitoring and. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the principle and application details of the zirconia oxygen sensor. *The working principle of some zirconia oxygen sensors 1. Product introduction: The zirconia oxygen sensor uses zirconia ceramic sensitive elements to measure the oxygen potential in various heating furnaces or exhaust pipes, and calculates the corresponding oxygen concentration by the chemical balance principle to achieve It is a measuring element that monitors and controls the combustion air ratio in the furnace to ensure product quality and exhaust emission standards. It is widely used in the atmosphere control of various types of coal combustion, oil combustion, gas combustion and other furnace bodies. It is the best combustion atmosphere measurement method at present, and has the advantages of simple structure, quick response, easy maintenance, convenient use and accurate measurement. Using this sensor to measure and control combustion atmosphere can not only stabilize and improve product quality, but also shorten production cycle and save energy. 2. Working principle of oxygen sensor: Oxygen sensor is designed by utilizing the oxygen ion conductive properties generated by stable zirconia ceramics in an environment above 650 ℃. Under certain temperature conditions, if there are different oxygen partial pressures (that is, oxygen concentrations) in the gas on both sides of the zirconia bulk ceramic, a series of reactions will occur inside the zirconia ceramic, and oxygen ions migration. At this time, through the extraction electrodes on both sides of the zirconium dioxide, a stable millivolt level signal can be measured, which we call the oxygen potential. It obeys the Nernst equation: where E is the oxygen potential (mv) output by the oxygen sensor, Tk is the absolute temperature (K) in the furnace, and P1 and P2 are the oxygen partial pressures of the gases on both sides of the zirconium dioxide, respectively. . In practical application, one side of the zirconium dioxide is passed into a gas (usually air) with a known oxygen concentration, which we call the reference gas. The other side is the gas to be tested, which is the atmosphere in the furnace we want to test, see Figure 1 for details. The signal output by the oxygen sensor is the oxygen potential signal. Through the Nernst equation, we can obtain the relationship between the oxygen partial pressure and the oxygen potential in the furnace atmosphere under test. When the reference gas is air, it can be expressed as: where E is the output oxygen potential of the oxygen sensor; Tk is the absolute temperature in the furnace; P02 is the oxygen partial pressure in the furnace. Our oxygen sensor products are equipped with a self-heating device, and the temperature is generally guaranteed at 700 ° C, so that the TK value is basically constant, so that the oxygen partial pressure concentration in the furnace can be directly measured by the above formula. In engineering applications, standard gas is used to calibrate the corresponding relationship between the output oxygen potential E of the oxygen sensor and the oxygen partial pressure concentration PO2. This method is also the most accurate and direct calibration method currently recognized. The second part HMP series oxygen sensor one. Basic structure of HMP oxygen sensor: The core component of HMP oxygen sensor adopts imported zirconia oxygen sensor (see Figure 2 for details). Ensure that the sensor works continuously and stably at this constant temperature. To install the probe, it is necessary to adjust the direction of the guide plate, and try to make the guide plate face the direction of the airflow, so as to form a self-guided gas flow to the detection atmosphere. The typical performance characteristics of imported zirconia oxygen sensor are as follows: Zero error: ￡±0.2mv; AC resistance (1500 Hz): (700°C) £100kΩ; (1100°C) £5kΩ. Response time (700-1300 ℃): ￡1 second two. Sampling and maintenance method of HMP oxygen sensor: The HMP oxygen sensor adopts the atmosphere self-direction method to introduce the detected atmosphere. Considering the environmental factors of the project site, it is designed with a purging and removal channel, which can easily purge the sampling guide pipeline to prevent To avoid dust, coal ash, oil impurities, etc. in the furnace or pipeline from clogging the sampling pipe, please refer to Figure 3. three. Technical performance: use temperature: room temperature ~ 1100 ℃; oxygen potential display range: -50 ~ 1240mV; oxygen potential output accuracy:±0.5mV; response time:≤1 second; normal service life:≥18 months. The third part of the installation of oxygen sensor Reasonable installation is the key to ensure the reliable operation of the oxygen sensor. Many use problems are caused by improper installation of the oxygen sensor. I hope users must pay special attention to this point. Please try to consider the installation of the oxygen sensor when installing the oxygen sensor. Requirements: 1. Sampling measurement points: Determining the measurement points is the primary work. The following principles should be followed: (1) The selected measurement point should correctly reflect the required furnace atmosphere to ensure the authenticity of the output signal of the oxygen sensor, and try to avoid the dead angle of the return air; (2) The measurement point should not be too close Burning points or nozzles, where the atmosphere is in a violent reaction, will cause the detection value of the oxygen sensor to fluctuate and distort; also do not get too close to the fan and other gas-producing equipment, so as not to damage the sensor due to the vibration of the motor; (3) Avoid placing it where possible The position of the collision, so as not to damage the probe due to collision, and ensure the safety of the sensor;

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