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Chlorine (Cl?) is a strong oxidant and has corrosiveness. When using Cl? to test some sensors, corrosion-resistant materials should be used in the testing system. Polytetrafluoroethylene (PTFE) or electroplated and polished stainless steel are recommended.

Before testing products with Cl? standard gas, it is necessary to ventilate for a certain period of time to rinse the inner wall of the gas pipeline. Otherwise, the concentration of Cl? is low in the initial stage of ventilation, resulting in a very slow signal output of the sensor. Through our multiple tests, after using Cl? standard gas with a standard concentration of 10 ppm, a gas pipeline with a length of 20 cm, and rinsing the pipeline at a flow rate of 0.5 L/min for 8 to 9 minutes, then introducing the gas into each sensor for testing can obtain relatively accurate test results.