Oxygen Analyzers

Oxygen analyzers provide valuable measurements in combustion control, process quality, safety and environmental applications. These are used in a variety of measurement scenarios including, but not limited to, boiler trimming in power plants, furnace optimization in refinery and petrochemical applications, process safety in vent headers, and product quality in ethylene production.

Yokogawa offers a full range of product solutions including an industry leading zirconia oxygen probe series, as well as a line of cutting edge tunable diode laser spectrometers.

Applications

	Tunable Diode Laser TDLS	Zirconia type（Concentration cell system） ZR/ZS	Zirconia type（Limiting Current type） OX	Magnetic type MG
Combustion / Process management	✓	✓		✓
Semiconductors / electronic components / manufacturing process			✓
Measurements containing flammable gas	✓			✓
No sampling required	✓	✓	✓
Explosion-proof	✓	✓		✓

>> Please refer to the Measurement Systems of the Oxygen Analyzer

Zirconia Oxygen/Humidity Analyzer ZR22G, ZR802G

This Oxygen concentration and humidity at high temperatures consists of a ZR22G detector equipped with a long-life and highly reliable zirconia sensor, and a converter ZR802G equipped with digital communication and data log functions.
ZR22G and ZR802G can be measured directly and continuously without a sampling device. It is easy to maintain and reduce operating costs by self-diagnosis of sensor deterioration (without using calibration gas )and replacing the heater assembly on site.

Vezi mai mult
Explosion proof Zirconia Oxygen Analyzer, Converter ZR802S, ZR22S

Oxygen Analyzer ZR802S, and ZR22S are most suitable for monitoring combustion and controlling the low-oxygen combustion of various industrial furnaces in explosive atmosphere at petroleum refinery, petrochemical plant, and natural gas plant.
Contributes to OPEX reduction in safe operation and maintenance work.

Vezi mai mult
Multi Channel Oxygen Analyzer System ZR22/AV550G

The AV550G multi channel oxygen analyzer system allows for measurements on up to 8 ZR22 probes simultaneously.The ZR probe's in-situ measurement method does not require any process conditioning or extractive sampling. This reduces maintenance costs and allows faster measurement response to changes in the process.

Vezi mai mult
Integral Oxygen Analyzer ZR202

The EXAxt ZR202 transmitter / detector combines benefits of the ZR402 remote analyzer and the ZR22 detector into an intelligent, rebuildable, low-cost measurement device for in-situ humidity measurement.

Vezi mai mult
Low Concentration (ppm) Zirconia Oxygen Analyzer OX400

The OX400 is a highly accurate and reliable low-concentration zirconia oxygen analyzer that is capable of measuring a wide range of concentrations, from 0-10 ppm up to 0-100 vol%O₂.

Vezi mai mult
Paramagnetic Oxygen Analyzer (Flameproof Type) MG8E

The MG8E paramagnetic oxygen analyzer measures the concentration of oxygen, employing a technique that is based on the fact that a magnet attracts gaseous oxygen. Whereas zirconia oxygen analyzers cannot measure oxygen in flammable gas mixtures, the MG8E can measure not only the oxygen concentration in flammable gas mixtures but also in low concentrations, with high precision.

Vezi mai mult
Paramagnetic Oxygen Analyzer (General Purpose Type) MG8G

The MG8G paramagnetic oxygen analyzer measures the concentration of oxygen based on the fact that a magnet attracts gaseous oxygen. Whereas zirconia oxygen analyzers cannot measure oxygen in flammable gas mixtures, the MG8G can measure oxygen concentration in flammable gas mixtures.

Vezi mai mult
Probe type Tunable Diode Laser Spectrometer TDLS8200

Sampling unnecessary, installation flange is only on one side, installation cost is reduced by half while keeping high speed measurement / high speed response. It can be easily exchanged from existing equipment.

Vezi mai mult
Product Finder

This web tool makes it easier to find products according to the application, measurement conditions and required specifications.

Vezi mai mult
In-Situ Gas Analyzer TDLS8000

Yokogawa’s new TDLS™8000 houses all of the industry’s leading features in one robust device. The platform design is for in situ measurements which negate the need for sample extraction and conditioning.

Vezi mai mult

Oxygen Analyzer Measurement Systems and Their Advantages and Drawbacks

The measurement system of the oxygen analyzer we currently sell is as follows.

Zirconia type measurement system:

Concentration cell system: ZR22G/ZR802, ZR202G, ZR202S and OX400
Limiting Current type: OX100 and OX102

Magnetic type measurement system:

Paramagnetic system: MG8G and MG8E

Tunable Diode Laser measurement system:

Tunable Diode Laser measurement system: TDLS8000, TDLS8100, TDLS8200

Since each measurement system has its own advantages and drawbacks, it is important to select an oxygen analyzer that is appropriate for your application and intended use. Below is an overview of each measurement system and its advantages and drawbacks.

Zirconia type measurement system

Concentration cell system

A solid electrolyte like zirconia exhibits conductivity of oxygen ions at high temperature. As shown in the figure below, when porous platinum electrodes are attached to both sides of the zirconia element to be heated up and gases of different partial oxygen concentrations are brought into contact with the respective surfaces of the zirconia, the device acts as an oxygen concentration cell. This phenomenon causes an electromotive force to be generated between both electrodes according to Nernst’s equation.

Concentration cell system

Advantages

Can be directly installed in a combustion process such as a boiler’s flue and requires no sampling system. And response is faster (ZR22G, ZR202G).
Capable o f measuring trace oxygen concentration (OX400).

Drawbacks

If the sample gas contains a flammable gas, a measurement error occurs (combustion exhaust gas causes almost no problem because it is completely burned).

Limiting Current type

As shown in the figure below, if the flow of oxygen into the cathode of a zirconia element heated to high temperature is limited, there appears a region where the current becomes constant even when the applied voltage is increased. This limited current is proportional to the oxygen concentration.

Limiting Current type

Advantages

Capable of measuring trace oxygen concentration.
Calibration is required only on the span side (air).

Drawbacks

If the sample gas contains a flammable gas, a measurement error occurs.
The presence of dust causes clogging of the gas diffusion holes on the cathode side; a filter must be installed in a preceding stage.

Magnetic type measurement system

Paramagnetic system

This is one of the methods utilizing the paramagnetic property of oxygen. When a sample gas contains oxygen, the oxygen is drawn into the magnetic field, thereby decreasing the flow rate of auxiliary gas in stream B. The difference in flow rates of the two streams, A and B, which is caused by the effect of flow restriction in stream B, is proportional to the oxygen concentration of the sample gas. The flow rates are determined by the thermistors and converted into electrical signals, the difference of which is computed as an oxygen signal.

Paramagnetic system

Advantages

Capable of measuring flammable gas mixtures that cannot be measured by a zirconia oxygen analyzer.
Because there is no sensor in the detecting section in contact with the sample gas, the paramagnetic system can also measure corrosive gases.
Among the magnetic types, the paramagnetic system offers a faster response time than other systems.
Among the magnetic types, the paramagnetic system is more resistant to vibration or shock than other systems.

Drawbacks

Requires a sampling unit corresponding to the sample gas properties or applications.

Tunable Diode Laser measurement system

Tunable Diode Laser (or TDL) measurements are based on absorption spectroscopy. The TruePeak Analyzer is a TDL system and operates by measuring the amount of laser light that is absorbed (lost) as it travels through the gas being measured. In the simplest form a TDL analyzer consists of a laser that produces infrared light, optical lenses to focus the laser light through the gas to be measured and then on to a detector, the detector, and electronics that control the laser and translate the detector signal into a signal representing the gas concentration.
Gas molecules absorb light at specific colors, called absorption lines. This absorption follows Beers law.
TDL Analyzers are effectively infrared analyzers which obey the Beer- Lambert Law.

I = I_o e^-EGL
where I is the radiation intensity after absorption
I_o is the initial radiation intensity
E is the extinction coefficient
G is the gas concentration
and L is the path length of the measurement area

Yokogawa Electric’s model : TDLS8000

Tunable Diode Laser measurement system

Advantages

Capable of measuring a number of nearinfrared absorbing gases in difficult process applications.
Capability of measuring at very high temperature, high pressures and under difficult conditions (corrosive, aggressive, high particulate service).
Most applications are measured in-situ, reducing installation and maintenance costs.
Most measurements are rapid (5 seconds) and interference free.

Drawbacks