Oxygen Sensor

The oxygen sensor is a current source, and the current depends on the oxygen reaction rate (Faraday's law). The voltage can be measured by connecting a known resistance. If the oxygen flow through the sensor is completely limited diffusion, this electrical signal can reflect the oxygen concentration.

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The life of the sensor is 2 years, and it can directly measure oxygen in the concentration range of 0-25%. The pins on the bottom of the sensor can be directly connected to a PCB board. This sensor is suitable for portable or fixed safety devices.

Output model

The operation of the oxygen sensor is simple, which is achieved by connecting a low resistance resistor to generate a voltage signal. The maximum voltage signal must not exceed 100mV.

In most cases, a 100Ω resistor is sufficient. In general, the higher the resistance value, the longer the response time of the sensor. It is important to choose a suitable range of resistors to eliminate changes and long-term drift between the sensors due to differences in output current and temperature.

Linear relationship

The signal generated in this oxygen series is slightly non-linear (refer to Figure 2), following the following formula:

Signal output and concentration

Note: If the sensor is calibrated in dry air, the value is 20.9% (S = 20.9, C = 0.209). This results in a K value of 89.14.

In the figure, the percentage concentration of oxygen in both curves is in the range of 0-20.9%, which reflects the relationship between the signal output during the calibration in the air and the oxygen concentration. The maximum deviation occurs when the oxygen concentration is 10%, and the output value is 0.5% lower than the standard value. In most cases, this deviation is negligible, but if necessary, digital technology can be used to compensate.

Carrier gas impact
In most cases, the oxygen sensor can be calibrated in ambient air, but if it is a high-concentration gas other than air, the carrier gas (that is, very little mixed oxygen) will have a greater impact on the output signal.

The output signal depends on the oxygen diffusion rate, which depends on the molecular weight of the carrier gas (Graham's law). The dry air contains 20.95% oxygen, and the remaining nitrogen with a molecular weight of 28, so when the carrier gas used is a gas with a molecular weight greater than that of nitrogen, the output signal will be greatly affected.  

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Operation notes
Please follow the instructions below to ensure proper use.

The sensor must not be stored for more than six months, and must be stored in a sealed container placed in clean air at 0-20 ° C.

The sensor cannot be stored in an environment containing liquid vapor. All sensors can not be used in the environment containing organic vapor, otherwise it will destroy its performance.

It must not be stressed during installation and fixation.

Because the sensor contains a small amount of lead, the discarded sensor must be properly disposed to protect the environment.



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