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Introduction

principle

1. Principle of ultrasonic level measurement

The ultrasonic pulse emitted by the ultrasonic transducer propagates to the measured liquid surface through the transmission medium, and then returns to the receiving transducer through the sound transmission medium after reflection. Measure the time that the ultrasonic pulse propagates in the sound transmission medium from transmission to reception, and then according to the sound edge in the sound transmission medium, the distance from the transducer to the liquid level can be calculated to determine the liquid level.

2. The flow measurement principle of the weir tank

The larger the flow in the open channel with smooth circulation, the higher the liquid level; the smaller the flow, the lower the liquid level. The flow rate can be calculated by measuring the water level. The corresponding relationship between the flow and water level in an ordinary open channel is affected by the slope ratio of the channel and the roughness of the surface. A weir groove is installed in the channel to produce a throttling effect, so that the flow in the open channel has a fixed corresponding relationship with the liquid level.

Commonly used water measuring weirs are: Parshall flume, triangular weir, rectangular weir, etc. Parshall flume is preferred.

Features

●Built-in multiple algorithms, suitable for various standard water weirs

●Sturdy and stable ultrasonic sensor is suitable for harsh working conditions

●Chinese menu, more convenient to operate

●Probe replacement is convenient, spare parts replacement is more convenient

The blind area can be manually set to shield the interference signal near the probe

The transducer has built-in temperature sensor, real-time automatic temperature compensation

application

In many occasions such as sewage discharge, water conservancy projects, water supply diversion canals, and farmland irrigation, the waterways are open channels rather than pipes. The measuring instruments for the water flow of these channels are called open channel flowmeters. For a standard water weir tank, a high-precision liquid level gauge is installed at the fixed point of the weir tank, and the flow rate is calculated according to the water level-flow relationship of the corresponding buried tank. FU90 type is such a high-precision ultrasonic principle open channel flowmeter, which can display instantaneous flow/accumulated flow/liquid level at the same time.

technical parameter

Measuring range:0.1L/s~99999.99m3/h
Cumulative flow:Maximum: 4290000000.00m3
Maximum range of liquid level:3m 
Level measurement accuracy:0.5%
Resolution:3mm or 0.1% (whichever is greater)
show:Chinese LCD
Flow measurement accuracy:Standard weir groove: 1~5%
Non-standard weir groove: 10~30%
Analog output:4-wire 4~20mA/750Ω load
Relay output:2 groups of AC 220V/ 8A or DC 24V/ 5A 
powered by:Standard 24VDC
Optional 220V AC, 12VDC, battery powered, solar powered
Communication:Optional RS485, RS232 communication, MODBUS protocol
Product power consumption:Split 24V power supply, maximum 4.6W
Integrated four-wire 24V power supply, maximum 3.1W
Process temperature:﹣20~80℃
Process pressure:standard atmospheric pressure
Working temperature:Split type host: ﹣20~+60°C, Probe: 20~+80°C 
Working environment humidity:≤90%RH, non-condensing
Probe Material:Standard: ABS, optional PTFE
Protection class:All-in-one type: display part IP67, probe IP68
Split type: display part P65, probe IP68

Selection table

FU90-Ultrasonic Open Channel Flow Meter

Type of measuring medium

All-in-one

Split

Separate probe signal cable length

All-in-one without this accessory

5 m

10m

Custom Length Cable

output

4~20mA output

4~20mA output + 2 switch outputs (24V, 5A relay signal)

4~20mA output + 2 switch outputs (220V.8A relay signal)

Power supply

DC24V

AC85~265v

DC12V, battery pack and solar panel



(special option) VARIO

No special options

RS485 communication

RS232 communication
The complete data of this selection table, please contact the sales staff or email to sales@kewill-auto.cn for complete samples.


KBS-Parshall tank (small)
KBM-Parshall tank (medium size)
KBL-Parshall trough (large)

Range code

Range 1

code specifying range
The complete data of this selection table, please contact the sales staff or email to sales@kewill-auto.cn for complete samples.
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