1. Measuring oxygen working principle of zirconia oxygen analyzer.
Zirconia is a solid electrolyte of zirconia, which is a stable zirconia ceramic sintered with a certain amount of calcium oxide or yttrium in pure zirconia.Because it contains oxygen ion holes in its cubic lattice, it is a good oxygen ion conductor at high temperatures.
Using this characteristic, at a certain temperature, when the oxygen content on both sides of the sensor is different, it is a typical oxygen concentration cell.If both inside and outside the zirconia tube coating is made of pure platinum electrodes, use the electric stove for zirconia heating tube, make its internal and external wall contact with different gases oxygen partial pressure, zirconium oxide tube became a oxygen concentration cell, in two platinum electrodes will be the following reaction:
On the air side (reference side) electrode: O2＋4e to 2O2-.
On the low oxygen side (measured side) electrode: 2O2- to O2＋4e.
When these two kinds of migration reach equilibrium, an electric potential signal E associated with the concentration of oxygen is produced between the two electrodes.
2. Technical specifications of zirconia oxygen analyzer.
| Measurement object | Various industrial furnace flue gas, mixed gas concentration. |
| Measuring element | Zirconia tube |
| Oxygen measurement range | 0-20.6% O2 or 10% |
| Precision instruments | The basic error of the system is less than or equal to plus or minus 2%. |
| Transmitter accuracy. | Level 1.0 (less than 1.0% full range value) |
| Temperature control precision | 700 plus or minus 2. |
| The response time | No more than 3 seconds (90% response) |
| Alarm output | The output of upper and lower limit nodes can be selected as “normally open” or “normally closed” points. |
| Analog output signal. | 4-20 mA ADC (load Ω 0-750 Ω) corresponding to the oxygen 0-10% O2 or 0-20.6% O2 |
| Background correction. | – 20 mV – ＋ 20 mV |
| Digital display form | LED four digital tube display. |
| The power supply | AC220V plus or minus 15% |
| Power consumption | <6W (excluding heating power) |
| Heating power | About 50W (mean) can provide 150W output power. |
| Environmental conditions | Temperature 0-50 ℃ relative humidity < 90% |
| The detector | About 10Kg, about 5Kg. |
3. WSLY series zirconia oxygen analyzer has the following main characteristics.
1). The sensor USES the Japanese ion plating technology, which greatly improves the service life.
2). The zirconia probe adopts all-321 stainless steel (1Cr18Ni9Ti) sheath, which has excellent wear resistance and corrosion resistance.
3). Direct interpolation: no sampling system, quick response, effective reduction of ash in smoke.
4). Thermal diffusion reference: no special reference air pump is required, and maintenance is simple.
5). Double parameter design: to overcome the dispersion of zirconia in China, to measure accurately and extend the service life.
6). On-line calibration of working conditions: accurate and reliable, easy to calibrate the single standard gas online, and the working conditions can be directly calibrated and measured accurately.
7). Thermal inertia protection: easy to install, thermal installation, and strong adaptability to stop furnace.
8). Removable components: easy to replace components, easy to maintain and lower cost of use.
9). Multi-function display: oxygen content (%);The oxygen potential.Temperature, the background electric potential parameter digital display is convenient.
10). Double range: 0-10% and 0-20.6% double-range, with a wide range of measurement.
11). Double output: the output of the switch quantity node and the output of 4-20ma are also available.
12). Large load: 750 euro / 4-20ma, convenient for remote installation.
13). The electric potential of the background is adjustable, and the range of adjustment is wide, and the parameters such as aging of components can be checked at any time.
14. Full floating design: common mode input, strong resistance to electric field, no special ground line, convenient installation.
15). High adaptability of product serialization: applicable to various types of gas, fuel and coal.The measured temperature ranges from room temperature to 1400 degrees.
4. How to selecte the model zirconia oxygen analyzer ?
The following aspects are considered:
1). Converter
The converter has a disc assembly (WSLY-701): the opening size is 75＋2mm ＊ 150＋2mm.
Wall-mounted (wsy-702): installation size: 260mm * 205mm * 90mm.
The display range of the converter is 0-20.6% or 0-10%.
Output: 4-20ma.
2). The detector
1. Insert depth selection: furnace wall thickness +300mm (the detector length specification is 400mm, 600mm, 800mm, 1000mm, 1200mm)
2. Selection of temperature of cigarette lighting:
Smoke temperature <700℃, choose WSLY standard detector.
Smoke temperature is greater than 700℃, choose WSLY high temperature type detector.
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