How to increase the service life gas detector oxygen sensor
Provide you with 4 practical tips on how to extend the life of gas detector oxygen sensor. These details should be paid attention to by us:
1. Fail safe mechanism
Equipped with a dynamic movable sealed chamber in the oxygen sensor. The biggest advantage is that it can make the product come with inherent fail-safe inspection capabilities. The continuous periodic signal and the measured Nernst voltage are like the heartbeat of a sensor. If these stop, then there must be a malfunction in the sealed chamber. In this way, the failure phenomenon will be quickly detected by the interface circuit.
2. Working in aggressive and humid environments
When the zirconium dioxide sensor is working in a warm and humid environment, it is important to keep the sensor at a better temperature than the surrounding environment. Especially the gas to be measured is mixed with corrosive components. This is not a problem if the heater is working at 700 degrees Celsius. However, this also means that when the sensor or application device is powered off, and the surrounding ambient temperature has dropped appropriately, the heater must be turned off last. Theoretically speaking, if working in a very humid environment, the sensor should always be on or still be provided with a backup voltage source.
If the above rules are not followed, condensate will form on the heater and sensor. Once the sensor is restarted, the condensate will evaporate, leaving corrosive salts and quickly damaging the heater and the sensor.
3. Protection under high humidity
In such an environment with high humidity or water droplets, the sensor should be protected from direct contact with water or dripping onto the high temperature outer cap of the sensor. Because this will cause a huge temperature shock to the sealed chamber of the sensor and the heater. The typical approach is to cover the outer cap of the sensor with a well-ventilated hood, or install the sensor in a cylinder with a larger diameter. At least the sensor should be installed in the application device tilted down, because this placement can make the sensor get rid of some water vapor and not be dripped into water droplets.
4. Using the sensor in a silicone environment
If there is silicone in the measured gas, it will damage the sensor. RTV rubber and organosilicon compounds are the main culprits, because these are widely used in many applications. These materials are often made of cheaper silicone resins, and once heated, they will release silicone vapors into the ambient atmosphere. When these vapors come into contact with the sensor, the organic components will be burnt at the high temperature part of the sensor, leaving behind fine silica particles. Silica will completely cover the pores and moving parts on the electrode.