Oxygen analyzer is an industrial process analysis instrument, mainly used for the detection of oxygen content in mixed gases in various industrial processes. It is widely used in petroleum, air separation, chemical process, magnetic materials, high temperature sintering furnace protective gas, electronic industry protective gas and glass, building materials industry and other industries. According to different working conditions, there are different principles of oxygen analyzer, specifically divided into electrochemical oxygen analyzer (also known as fuel cell oxygen analyzer), zirconia oxygen analyzer, magnetic oxygen analyzer (also known as paramagnetic oxygen analyzer), laser oxygen analyzer, different principles of oxygen analyzer, each has different advantages and disadvantages. Oxygen analyzer is widely used in flue gas on-line continuous monitoring systemCEMSThe measurement of flue gas humidity can also be applied to the humidity measurement and control of wood, building materials, papermaking, chemical, pharmaceutical, fiber, textile, tobacco, vegetable and food processing.

At present, electrochemical oxygen analyzers occupy the main market share. However, the disadvantages of electrochemical oxygen analyzers are that the temperature range of the sensor workplace is narrow, the pressure cannot be high, and the sensor life is short. In addition, because the electrolyte has been consumed, the stability of the instrument is poor, and the drift is large. In the process of use, it is necessary to debug and correct frequently to ensure the stability of the instrument operation.

Therefore, there is currently an ion flow sensor on the market that can replace electrochemistry, although the cost is slightly more expensive than electrochemistry. However, with a wide range, high precision and high temperature tolerance, the ion flow based on the zirconia principle basically only needs to be calibrated once in the whole life cycle. Later basically does not need maintenance.

What is the limiting current sensor?AustriaSensorLimiting current oxygen sensors are also referred to by users as ion current sensors. The carrier of the current in the zirconia electrolyte of the sensor is oxygen ions, so when a voltage is applied to the zirconia electrolytic cell, oxygen is pumped through the zirconia disk to the anode. If a perforated cover is added to the cell cathode, the rate of oxygen flow to the cathode is limited. Limited by this rate, the current in the cell will reach saturation as the applied voltage is gradually increased. This saturation current is called the limiting current and is proportional to the oxygen concentration in the ambient environment. Based on this principle, the limiting current oxygen sensor has a very wide measurement range, and the measurable oxygen concentration ranges from10 ppmTo96%Oxygen varies. And high precision, fast response, in most cases only need to be carried out once during the life of the sensor.“Single point calibration”Later maintenance is very important.

Working mode.There are two main modes of operation of the sensor. Depending on the ambient conditions, the sensor operates with a constant voltage or a constant resistance. If the ambient temperature change is small, heating can be performed with a constant voltage, the required heating voltage depending on the sensor package. If the temperature change is large, the sensor should be used in constant resistance mode. In this case, the sensor is regulated by a constant heating resistor so that the sensor temperature remains constant. For sensor heating, the sensor also requires a secondary voltage. This depends on the sensor type0.7 - 1.6V. In general, the circuit design is not difficult, but there is one more driving circuit than electrochemical oxygen analysis.

Oxygen analyzer is an industrial process analysis instrument, which is mainly used for oxygen content detection in mixed gas of various industrial processes. According to different working conditions, there are oxygen analyzers with different principles. While acting on the ion flow oxygen sensor, the saturation current inside the electrolytic cell is proportional to the oxygen concentration in the surrounding environment at all times. The display screen of the oxygen analyzer allows you to ensure that the environment and working conditions are normal at a glance. Ion flow sensor wide range selection, and long life characteristics are very suitable for oxygen analysis equipment, commonly used models are.0-1000PPMofSO-B0-001、0-25%rangeSO-E2-250and0-96%rangeSO-E2-960。