Zirconia oxygen analyzer

Zirconia oxygen analyzer--Jinhu Tianxiang Instrument Co., Ltd. Quality is the life of the enterprise, and every product is a masterpiece of craftsmanship!

1. Working principle of zirconia analyzer

Fully stable zirconia ceramic is a solid dielectric material that exhibits ion conductivity at a certain temperature. It is a key component in measuring devices that converts flue gas oxygen concentration into electrical signals. At a certain temperature, when the oxygen concentration on both sides of the zirconia tube is different, an oxygen concentration difference potential will be generated on both sides of the zirconia tube. The two leads on the zirconia tube will send the oxygen concentration difference potential to the secondary instrument for processing and calculation, and display the oxygen content.

1、 Product Overview

There are two installation methods: flange insertion installation for the primary oxygen sensor and embedded or wall mounted installation for the secondary display instrument panel. A six core cable is used to connect the primary oxygen sensor and the secondary display instrument for signal transmission, with four cores using shielded cables of ≥ 1mm2 (respectively connected to oxygen potential and thermocouple signals), and the other two cores using ordinary cables of ≥ 1.5mm2 (connected to heating furnace signals). Please pay attention to the polarity and sequence of the signal lines during installation and do not connect them incorrectly. Otherwise, the instrument cannot function properly and may even cause damage to the instrument.

WDG-1210 oxygen analyzer is a practical and reliable online gas oxygen content automatic analysis instrument. It consists of a primary oxygen sensor (commonly known as a zirconia probe) and a secondary display instrument (commonly known as an oxygen transmitter or analyzer). It is mainly used in various combustion equipment such as boilers, kilns, oil furnaces, and steam furnaces that use coal, oil, and gas as fuels in industries such as petroleum, power, metallurgy, chemical, glass, pharmaceuticals, and textiles. It monitors the residual oxygen content of the flue gas generated during the fuel combustion process to grasp the degree of fuel combustion in the combustion equipment, reduce waste, lower energy consumption, and at the same time reduce environmental pollution, achieving the goal of protecting the environment.

2、 Working principle

1. Zirconia tube is a metal oxide that forms a solid electrolyte at high temperatures and has the property of conducting oxygen ions. The measured gas (flue gas) passes through the probe filter and enters the inside of the zirconia tube, while the reference gas (air) enters the outside of the probe zirconia tube through natural convection. When the oxygen concentration inside and outside the zirconia tube is different, an oxygen concentration difference electromotive force will be generated between the inside and outside of the zirconia tube. (See Figure 1)

This oxygen concentration difference electromotive force can be expressed using the Nerast formula as follows:

In the formula: EZ - gas concentration electromotive force, unit mV

R - Ideal gas constant, 8.314 joules/degree · mole

T - working temperature K, 273.16+T ℃

N - the number of electrons involved in the reaction, which is 4

F-Faraday constant, 96500 Coulomb

PA - Reference gas (air) attempt to take 20.6%

PO - measured gas (flue gas) concentration, unit:%

Under the determination of the reference gas, the gas depth difference electromotive force Ez output by the zirconia probe is only a function of the working temperature of the probe and the concentration of the measured gas.

2. The main function of TXZO zirconia oxygen analyzer is to convert the gas concentration difference electromotive force Ez output by the gasification zirconium probe into a current signal output that is linearly related to the measured gas content in the flue gas.

3、 Main technical parameters

1. Structural composition

It consists of a primary oxygen sensor (commonly known as a zirconia probe) and a secondary display instrument (commonly known as an oxygen transmitter or analyzer).

(1) Specification (insertion depth) of zirconia probe for primary instrument: L=400mm, 600mm, 800mm, 1000mm, 1200mm, 1400mm, etc.

(2) Secondary instrument - zirconia oxygen analyzer, available in wall mounted and panel mounted horizontal sizes of 160 (width) x 80 (height) x 260 (depth); Straight 80 (width) x 160 (height) x 260 (depth); Wall hanging type 170 (width) × 220 (height) × 75 (depth)

2. Model naming and parameters

(1) Zirconia probe TXZO type, such as TXZO-800, refers to an 800mm zirconia probe.

(2) Zirconia oxygen analyzer is ZOX type, divided into three types: ZOX-H (horizontal disk mounted), ZOX-Z (vertical disk mounted), and ZOX-Q (wall mounted)

3. Primary oxygen sensor (zirconia probe)

Measurement range: 0.05% O2 to 20.6% O2

※ Tested flue gas temperature: ≤ 800 ℃ (low temperature type),>800 ℃ (high temperature type)

※ Excess coefficient of tested flue gas: 0.1-99

※ Response time: 3 seconds

Background potential of zirconia: ≤ 3mV (T=700 ℃± 10 ℃)

Working temperature of heating furnace: 700 ℃± 5 ℃, freely set within the range of 500 ℃～ 850 ℃

Heating furnace working voltage: (0-80) V pulse

※ Thermocouple division number: K-type

Work pressure: -100Kpa to 100Kpa

※ Insulation resistance: ≥ 20M Ω (500VDC. Megohmmeter)

※ Insulation strength: 1.5KV sine AC voltage does not break down for 60 seconds.

※ Protection level: IP65

※ Oxygen potential transmission range: 126.205mV~0mV (corresponding to 0.05% O2~20.6% 02)

※ Insertion depth: 400mm, 600mm, 800mm, 1000mm, 1200mm, 1400mm (special specifications can be negotiated and ordered)

Installation method: Dn50Pn0.25 flange (see flange external structure diagram)

Weight: ≤ 10Kg

4. Secondary oxygen display instrument (zirconia oxygen analyzer)

Oxygen range: 0.05% O2 to 20.6% O2, accuracy ± 0.2%

※ Temperature range: 0 ℃~800 ℃

Heating furnace working voltage: (0-80) V pulse

※ Output current: (4-20) mA accuracy ± 0.5%

Working voltage: (220 ± 15%) VAC. 50Hz~60Hz

※ Environmental temperature: 0 ℃~50 ℃

※ Environmental humidity: ≤ 85% in an environment without corrosive gases.

※ Upper and lower limit settings: 0.05% O2~20.6% O2, 100% full-scale setting

※ Relay contact capacity: 1A220VAC. Resistive load

※ Power consumption: ≤ 15W

Weight: ≤ 2Kg

※ Dimensions: Plate mounted horizontal type 160 (width) x 80 (height) x 260 (depth)/straight type 80 (width) x 160 (height) x 260 (depth)/wall mounted type 170 (width) x 220 (height) x 75 (depth)

※ Hole size: Horizontal 151 (width) x 76 (height), straight 76 (width) x 151 (height)

4、 Product Selection Table

1. Primary oxygen sensor (zirconia probe)

2. Secondary oxygen display instrument (zirconia oxygen analyzer)

3. Attention to selection of zirconia probes

For the frequent use of our company's intelligent instruments in industry, we must have a good understanding of the usage environment. The temperature range of the flue gas is 800 degrees, which belongs to a low-temperature environment. We use standard zirconia probes. For environments above 800 degrees, we use low temperature zirconia probes. If the flue gas contains a high concentration of sulfur dioxide and SO2 gas, we use specially designed probes.

The detector consists of main components such as dust prevention device, zirconia tube, heating furnace, thermocouple, gas conduit, junction box, and housing. The entire device adopts a fully enclosed structure to increase its sealing performance and improve its service life. For high dust detection environments, porous ceramic filters were installed to achieve better filtration efficiency.

The zirconia tube inside the detector is the core component and is a fragile ceramic item. During transportation, installation, and use, severe vibration should be avoided to prevent damage. The function of the heating furnace inside the detector is to provide the temperature required for the normal operation of the zirconia element. In order to extend the service life of the heating furnace, special treatment has been made in the process. Due to the heating device of the detector itself, it can work normally in environments below 700 ℃.

5、 Typical applications

Control of Heating Boiler

Control of industrial production processes

Control of Aircraft Onboard Oxygen Generation System in the Aviation Industry

Diagnosis of Automotive Exhaust

※ Factory instruments

Medical oxygen supply equipment

Detection of oxygen content in industrial flue gas

※ Burner oxygen content detection

※ Oxygen concentrator

Submarine oxygen chamber, oxygen bar

Oxygen measurement in the ship warehouse and controlled atmosphere preservation storage industry

Detection of protective gases in the food packaging industry

Detection of residual oxygen in fermentation industry

Protective gases during the production process (welding, heat treatment)

Experimental equipment

Testing of Oxygen in Biotechnology and Medical Systems

In any situation where accurate measurement of oxygen concentration is required

Tianxiang Instrument is a key measurement and control engineering complete unit in China, mainly engaged in gas flow meters, liquid flow meters, steam flow meters and other related products. The company has a group of professional high-tech talents engaged in the design, development, installation and commissioning of automation control research, providing satisfactory complete systems for various industries.

Welcome to choose Tianxiang Instrument Zirconia Oxygen AnalyzerFor our series of products, if there is any non-human damage or quality issue with our products, we will implement a three guarantee policy within one year from the date of delivery, and provide lifelong maintenance services beyond the three guarantee period. To achieve the great Chinese Dream, Tianxiang Instrument is working hand in hand with you!