How to prolong the service life of oxygen sensorStep 1: Ensure the oxygen sensor and transmitter board wire correctly and securely
Verify that the oxygen sensor unit is securely mounted and properly sealed (if it fits). Verify that neither the O2 oxygen sensor nor the wiring is damaged; make sure the cables are strain-free and not twisted; all screw terminals are properly tightened. Test the power supply to ensure it is providing the correct terminal block voltage before connecting to the device.
Step 2: Evaluate the environment in which the oxygen sensor will be used
When using the oxygen sensor in a warm, humid environment, it is not a problem because the zirconium oxide core is heated to 700°C. However, when the oxygen sensor is powered off, it may corrode because if condensation forms on the heater and sensing element, when the sensor is powered back on, the condensation will evaporate, leaving corrosive salts that will damage the heater and sensing element. As shown in the picture, the outside of the oxygen sensor is normal, but the core is corroded.
Step 3: Avoid using oxygen sensors with silicone
The presence of silicon in the gas can damage the zirconium oxide oxygen sensor. The vapors (organic silicon compounds) of RTV rubber and sealants are the culprits. When heated, the silicone vapors are released into the surrounding atmosphere. When these vapors reach the sensor, they partially burn, leaving behind silicon dioxide (SiO2). This SiO2 blocks the pores and active parts of the electrode. It is recommended to use seals such as FKM, NBR, PTFE, etc. that do not contain silicone components.
Step 4: Prevent combustible gases and chemicals from damaging the oxygen sensor
Combustible gases
H2 (hydrogen) up to 2%; CO (carbon monoxide) up to 2%; CH4 (methane) up to 2.5%; NH3 (ammonia) up to 1500 ppm;
Heavy metals
Vapors from metals such as zinc, cadmium, lead, bismuth, which will have an impact on the catalytic performance of the platinum electrode.
Halogens and sulfur compounds
Small amounts (< 100ppm) of halogens and/or sulfur compounds have no effect on the performance of the oxygen sensor. Higher concentrations of these substances in a condensing environment will corrode sensor components and affect the service life of the oxygen sensor. Gas Survey:
Halogen, fluorine, chlorine; HCL (hydrogen chloride), HF (hydrogen fluoride) SO2 (sulfur dioxide) H2S (hydrogen sulfide) Freon gas, CS2 (carbon disulfide)
Step 5: Avoid long-term use under reducing gas, fine dust and strong vibration
Prolonged exposure to reducing atmosphere will weaken the catalytic effect of platinum electrodes. In this type of atmosphere, oxygen is consumed as the combustible gas burns. Fine dust may cause clogging of the porous stainless steel filter and may affect the response speed of the oxygen sensor. Severe shock or vibration may change the sensor characteristics
