1.Ultrasonic water meter for water\liquid level 2.Ac or Dc power supply optional 3 ... 1 second 6. Output signal: 4~20mA 2-wire,Provide MODBUS7. Relay output:Floor\Highest alarm and control (material level/liquid level) ... position sensor,Liquid level controller/transmitters/switch,Capacitance position and level sensor,Ultrasonic displacement sensor/level meter for industrial,mobile and oil,gas,fuel ...