Zirconia Analyzer / Oxygen Analyzer Model: HAD-ZrO2
I. Overview
The zirconia flue gas oxygen analyzer is a new type of oxygen analyzer developed in recent decades. Due to its simple structure, convenient maintenance, fast reaction speed and wide measuring range, it is widely used in electric power, metallurgy and heating. Building materials, electronics and other departments analyze the oxygen content of flue gases in various industrial boilers and kiln, improve combustion efficiency, save energy and reduce environmental pollution.
The zirconia oxygen analyzer consists of a converter and a detector (commonly known as an oxygen probe). On the zirconia concentration cell of the core component of the detector, nanomaterials and advanced production processes are used to add a suppression electrode to the electrode coating. Aging additive. The accuracy and service life of the zirconia measuring probe are greatly improved. The detector adopts the in-line probe structure, which does not need a sampling system, and can timely reflect the combustion condition in the boiler. If used in conjunction with the automatic control device, the combustion condition can be effectively controlled. The converter adopts intelligent design of single-chip microcomputer and Chinese character liquid crystal display, which makes the data display and function control more humanized; it can be connected with various types of DCS data access devices. Make the operation of the meter simple and easy to master. Has the following characteristics:
??? 1. It has strong versatility and can directly replace other manufacturers' oxygen analyzers.
2. Large screen blue and white LCD display.
??? 3. Full Chinese operation menu (export menu can provide English menu).
4. The oxygen range is freely set within 0-25% (minimum range 0-5%).
5. The temperature is controlled by PID, and the temperature is 700 °C and 750 °C (selectable on site).
??? 6. It can set the upper and lower limit alarm indications of oxygen, and the upper and lower limit alarm indications.
7. The background potential is corrected by one button.
??? 8. Online calibration with standard gas.
9. The 4-20mA standard current output is optically isolated from the main circuit and can be directly transmitted to the DCS system.
??? 10. A variety of fault information tips.
Second, the working principle
Zirconium oxide is a high-temperature electrolyte concentration battery that has energy in a high temperature environment of hundreds of degrees.
Conductivity that produces oxygen ion migration due to the measured gas (flue or other gas) and the reference gas
The body (air or other gas) has different oxygen partial pressures on the platinum electrode on both sides of the zirconia, and there is a gap between the two poles.
A certain amount of oxygen ions migrate to generate an oxygen concentration potential, and the relationship between the potential value and the oxygen concentration can be
Expressed in Nernst's formula:
E=RT/4F×LnP1/P2
Where: E—oxygen concentration potential (V)
R—ideal gas constant (8.314J/moLK)
T—absolute temperature value (K)
F—Faraday constant (96500c/moL)
P1—reference gas partial pressure (air)
P2—the partial pressure of the gas to be measured
The transmitter converts the measured data into a single-chip computer, and displays the oxygen content on the LCD screen and converts it into a current signal for use by a computer or a recorder.
The relationship between oxygen concentration and oxygen concentration potential at 700 ° C and 750 ° C is shown in the attached table.
Third, technical indicators
?? Range: 0.01 ~ 25.0% O2 (range is freely set from 5.00% -25.00%)
Output signal: 4 ~ 20mA load resistance ≤ 500Ω isolation
Repeatability: ±0.5% of full scale
Basic error: ≤±2% (full scale)
Stability: ≤±1% (instrument continuous verification 4h)
Response time: When the standard gas is introduced from the detector inlet, it reaches 90% response within 5 seconds.
Ambient temperature: Detector -10 ° C ~ 80 ° C Converter 0 ° C ~ 40 ° C
Power and power consumption: 220±10% VAC for power supply and up to 150W
?? Sample gas temperature: ≤700 °C (confirmed supply above 700 °C)
Sample gas pressure range: ±10KPa
?? Detector length: 0.4m; 0.8m; 1.0m; 1.2m; (other lengths can be produced according to user requirements)
Fourth, the detector structure
The detector consists of dust-proof devices, zirconia tubes, heating furnaces, thermocouples, gas conduits, junction boxes, and housings. The entire device adopts a fully enclosed structure to increase the sealing performance of the entire device and increase the service life. For the high dust detection environment, a porous ceramic filter is added for better filtration.
The zirconia tube in the detector is the core component and belongs to the ceramic fragile product. During the transportation and installation, the violent vibration should be avoided to avoid damage. The function of the furnace in the detector is to provide the temperature required for the normal operation of the zirconia element. In order to extend the life of the furnace, special treatment is carried out in the process. Since the detector itself has a heating device, it can work normally in an environment below 700 °C.
Details in the data download
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