Project Description

Non Contact Ultrasonic Liquid Level Indicator

Working Principle

Ultrasonic sensor transmit and receive ultrasonic under the control of the microprocessor. Use the ultrasonic transmission time( t )in the air to calculate the distance(s) between the medium and the ultrasonic sensor. Due to the speed(c) of sound waves in the air is a certain amount , depending on: s = ct / 2 s can be calculated, and because the distance(H) from the ultrasonic sensor to the bottom of the container is certain, the level of the medium to be tested H = H – s.


  • Adopting high speed digital signal processing technology, intelligent recognition and analysis, suitable for bad environment.

  • Advanced signal environment display (oscilloscope technology), easy for debugging and installation.

  • High-speed and reliable microcomputer processing, fast and stable.

  • Non-contact measurement, multiple data filtering technology, stable and reliable measurement.

  • High accuracy D/A output, improve the precision of 4-20 mA output.

  • Equip with 485 interface, can contact with computer and other data collector.

Technical Indicators

Measurement Range 5m, 10m, 15m, 20m
Accuracy 0.25%, 0.5%
Resolution Ratio 1mm
Operating Temperature ﹣20℃~﹢50℃
Protection Grade Display part: IP65, probe part: IP67
Power Supply AC220V±10% 6W, DC24V
4~20mA Output External Loading: 0~500Ω
Error: 0.1% (Relative instrument indicate)
Output: Level or distance
RS485 (Optional) Encoding: 1 start bit, 8 data bits, 1 stop bit
Baud rate: 9600
00-09, when set as 00, every measurement will  output at a time
When set as 01-09, need order query:
Send the format: !X (x is address)
The echo formats: 3.128
Relay(Optional) Control mode: the upper limit of liquid level , the lower limit of liquid level .
Type: single pole double throw (normally open, normally closed)
Contact capacity: AC250V 1 A.DC30V 5 A

Related Level Measurement