WP311 input type level transmitter uses imported sensitive components with anti-corrosive diaphragm. It puts the chip into a stainless steel case. The steel cap can protect the sensor and make the liquid contact diaphragm. The instrument uses special cable which makes the pressure diaphragm can contact with air. The measurement does not affect by the external atmospheric change. It is high accuracy and long-term stability. It is in line with marine standard and be used in the water and oil for a long time. the PTFE case and cable can be used to measure many corrosive liquid.