Ultrasonic open channel flowmeter

Ultrasonic open channel flowmeterpurpose

This instrument is used in conjunction with a measuring weir to measure the sewage flow rate in channels with free flow conditions. Due to the sensor not being in contact with the measured fluid, contamination and corrosion of sewage in the channel are avoided.

Measuring sewage flow rate can have higher reliability than other forms of instruments; The instrument can be equipped with two RS485 interfaces and one 232 interface, which can be connected to remote digital communication devices; The instrument stores and records data at minute intervals. The stored records can be viewed through the buttons on the instrument panel; It can also be done through digital communication devices; The instrument is suitable for monitoring sewage discharge and measuring the flow rate of water in open channels in irrigation areas.

Ultrasonic open channel flowmeterDimensions of the instrument:

I. Dimensional drawing of transmitter:

II. Dimensional diagram of probe:

Note: The probe cable is 10 meters long.

Main technical parameters of the instrument:

1. Flow range: 10L/s to 10000L/s (depending on the type and specifications of the measuring weir used)

2. Accumulated: 10 decimal digits, automatically reset and recalculate when accumulated to full.

3. Flow accuracy: ± (1~5)% (± (1~3)% for uncertain water measuring weir slots, with additional instrument measurement)

Measurement error ± (1-2)%

4. Measurement range: (0-2) meters

5. Probe blind spot:<0.1 meters

6. Distance measurement accuracy: ± 0.2% or ± 2mm (within a 1-meter range)

7. Resolution: 0.1mm

8. Instrument protection:

The protection level of the transmitter is IP66

The protection level of the sensor is IP68

9. Clock error:<1s/d

10. Accumulated traffic:

Accumulate queries on time

Accumulate daily queries

Monthly cumulative query

Annual cumulative query

11. Instrument data storage: stored by hour, can be saved for 10 years

12. Output signal (4-20) mA:

Transmitting instantaneous traffic

The external sampling resistor is 510 Ω

13. Digital signal:

ModBus RTU protocol

A is the positive electrode, B is the negative electrode

14. Relay output (1-4) channels:

Control the on/off of relays by setting instantaneous flow rate

Type: Single blade double throw (normally open, normally closed)

Contact capacity: AC250V 5A; DC30V 3A

15. Working temperature:

Temperature range of transmitter: -20

Temperature range of sensor: -30 ℃ to 70 ℃

16. Power supply:

Communication: 220V 50HZ 5W

直流： DC（12-28）V 3W