... and so on. Ultrasonic can spread effective in lots of occasion, Such as: storage tank, materials trough, pool, well, Drains, measuring ... 20mA 2-wire,Provide MODBUS7. Relay output:Floor\Highest alarm and control (material level/liquid level)8. Temperature range: -40° ... sensor,Liquid level controller/transmitters/switch,Capacitance position and level sensor,Ultrasonic displacement sensor/level meter for ...