The liquid level sensor uses the principle of infrared optics to transmit the detected liquid level and liquid level signals through optical transmission and convert them into electrical signals for output. The liquid level is judged by the voltage signal collected by the sensor. The sensor is compact in design, small in size, waterproof, and has a cylindrical shape that is convenient for drilling and installation; The installation methods are diversified, which can be installed on the top, bottom, sideways, and obliquely. The sensor head is , easy to clean, and the accuracy is that of the float type liquid level switch. The controllable accuracy is within 0.5MM. The existing commonly used float type liquid level switch has an accuracy of 3.0MM; light principle, no friction and other mechanical moving parts, the service life is greatly increased Working voltage; Dc5V Working current: less than 10MA Output mode 1: analog output 0-4.5V Output mode 2: high/low level signal output Response time: less than 500Ms Insulation resistance: 100M Working temperature: -30~80 Celsius Working humidity: 0-100%RH Waterproof features: fully sealed waterproof design Installation : M15*12 round hole Lead Length: 0.5m Size: 30MM x 20MM x 12MM Colour:black Material:pvc Package Contents: 1 * sensor 1 * probe Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.