This is specifically engineered for use in the oil and petrochemical industries, this stainless steel sensor is completely sealed and explosion-proof. This has low impedance which allow for transistor circuit input. When mated with conduit, it provides positive protection against damage due to water, high humidity, oil, dirt, or corrosive liquids. ATEX listed for II 2 GEExm II T3. This explosion proof is for gas, vapor, and liquid.