open channel flow meter, ultrasonic flow meters for irrigation canal of 9000m3/h

General introduction
The Open channel Ultrasonic Flowmeter is a high precision flow measurement instrument, which use Transit Time Ultrasound principle to measure the flow in a variety of Flumes, Weirs or Troughs.

Work principle
Ultrasonic transducer, is a transceiver which emits high frequency sound, which hits the medium surface and returns back to the sensor receiver. The time of travel of the ultrasound is inversely proportional to the height of the flowing medium. This way the height of the flowing medium is calculated. And with the algorithms programmed the Height, Flowrate and Total Flow are calculated and displayed.

Main technical index

Dimensions

Features

• Built-in variety of algorithms, suitable for a variety of standard weirs.
• Stable sensors - Suitable for harsh industrial situations
• Isolated 4~20mA current output. Optional spot bus interface.
• The blind zone can be manually set, shielding the probe near the interference signal.
• Calibrated at Factory. And if required we shall do calibration at site.

Sensors

Ultrasonic sensor Static pressure sensor
Applications
Measurement of water flow in Effluent, Waste Water, Rivers, Canals, Drains, Sewage, etc.
Flow Totalizer parameters
Flow measuring range: Depends on the size of the flume.
Maximum Count: 9999999999
Types of suitable weirs: Triangular weir, rectangular weir, Parshall flume, etc.
Display accuracy: 1 count. Overall accuracy depends on the input signal. Different Weirs /
flumes has different accuracies. A triangular weir has 1 to 2% flow error, a rectangular weir
has 1 to 4% accuracy, a Parshall flume has 3% flow error, etc.
Display: 2.8-inch LCD. Displays Height, Flowrate, Total Flow, etc.

Output
Voltage output: DC 12V or 24V
Signal output: RS485/RS232; 4~20mA; 2 channel relay

Troughs

Triangle weirs

Installation sample


Advantage
The production capacity is 20000 ultrasonic converter and 100,000 ultrasonic sensor.