HDL602 gas cylinder type liquid level transmitter consists of stainless steel gas cylinder, stainless steel capillary and explosion-proof junction box. The sensor and signal processing circuit are designed inside the junction box, and the gas cylinder is put into the liquid under test to collect the pressure signal. The liquid level pressure signal collected by the gas in the gas cylinder transmits the pressure to the sensor through the stainless steel capillary, thereby avoiding the direct contact between the sensor and the measured medium, suitable for high-temperature corrosiveness and other occasions, effectively solving high-temperature corrosive liquids and Difficulties in wastewater level measurement.