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New态氧分压变送器(氧含量分析仪) ZH420-O推出


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标签(TAG):oxygen sensor O2S


· Oxygen pressure range 2 mbar...3 bar

· Zirconium dioxide (ZrO2 ) sensing elements

O2S-FR-T4/ O2S-FR-T4-4P/ O2S-FR-T2/ O2S-FR-T2-18A/ O2S-FR-T3/O2S-T6/O2S-T6-SH/O2S-T2/O2S-T3

O2S Series

Oxygen sensors

· Non-consumptive technology

· Integral heating element

· No need for temperature stabilisation

· No reference gas required

· Function testing and calibration in

ambient air

· High accuracy

· Linear output signal

· Operates with external interface boards


by admin 发表于:2007/8/11 7:35:09
回复:oxygen sensor  of  X
引用 | 举报回复

At temperatures above 6500C Zirconium Dioxide (ZrO2 ) exhibits two mechanisms:

Firstly, it partly dissociates, producing mobile oxygen ions within the material. Normally moving at random, these ions can be transported through the piece of ZrO2 when a DC voltage is applied across the material. This liberates an amount of oxygen at the anode proportional to the charge transported (electrochemical pumping action).

Secondly, when there is an oxygen pressure difference across a piece of ZrO2 a voltage (the Nernst voltage) is generated across it. This voltage is proportional to the natural logarithm of the ratio of the oxygen pressure on each side of the material.

These mechanisms are used in a number of oxygen sensors but our sensor makes use of both simultaneously. This removes the need for a reference pressure which simplifies the sensor operation.

Our sensor contains 2 pieces of ZrO2 with a small hermetically sealed chamber between them. One of the discs functions as a reversible oxygen pump, which is used to successively fill and empty the chamber. The second disc measures the ratio of the oxygen partial pressure difference and generates a corresponding sense voltage. A heater surrounding the sensing element produces the 7000C required for the ZrO2 to act as a pump.

The time taken for the pump to achieve specific minimum and maximum pressures within the chamber is a measure of the partial pressure of oxygen in the environment. Al2O3 discs filter particulate matter and neutralize un-burnt gasses to avoid contamination, which might lead to unstable readings.

by advsensors 发表于:2007/8/11 18:16:17
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