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Open Channel Flow Meter
There are two models of open channel flow meters. One can distinguish between “integrated type” and “split type” ultrasonic open channel flow meters. It is mainly used in urban water supply diversion channels and agricultural irrigation, etc.
Working Principle Of Open Channel Flow Meter:
- The idea behind an Open Channel Flow Meter is the conversion of liquid level to flow. Liquid level is converted into flow data using an ultrasonic open channel flow meter. Generally speaking, the liquid level in the weir rises with the channel’s flow.
- When the fluid passes through the trough, the Ultrasonic Open Channel Flow Meter’s measuring probe, which is positioned directly above it, determines the water level. The data processing system then automatically uses the matching formula that is recorded in the meter head to determine the medium flow rate.
Features:
Open Channel Flow Meters are usually used in conjunction with measuring channels and are suitable for triangular weirs, rectangular weirs, and Parshall flumes. During installation, the downstream water level of triangular weirs and rectangular weirs should be lower than the weir ridge, and the flooding of Parshall flumes should be lower than the necessary flooding water level of the parameters.
Two Types Of Open Channel Flow Meter:
There are two models of Open Channel Flow Meters. One can distinguish between “integrated type” and “split type” ultrasonic open channel flow meters. A digital LCD meter is mounted on top of the one-piece open channel meter to show flow data, and the integrated type is tiny and compact. Large in size, the split open channel flow meter has cables and probes, and the specially made cables can reach a length of 100 meters. The split open channel flow meter is wall mounted. The user should be mindful of upkeep and keep out of the rain and sun when using it. The split flow meter body can be installed in a protective box or indoors.
Parameters:
| Measurement range | 0.1L/s~99999.99m 3 /h |
| Total flow | Max.: 4290000000.00m 3 |
| Max. scale value of water level | 3m, 0.40m for dead area |
| Measurement accuracy of water level | 0.5% |
| Resolution ratio | 3mm or 0.1% (the larger one shall be taken) |
| Display | LCD display in English |
| Flow measurement accuracy | 1~5% for standard weir flume (wire flume and channel
complied with national standards) 10~50% for non-standard weir flume |
| Analog output | 4-wire, load of 4~20mA/600Ω |
| Relay output | (Optional) 2 setsAC 220V/ 8Aor DC 24V/ 5A |
| Power supply | Standard 24VDC 100mA; or optional 220V AC+15% 50Hz (Optional) 12VDC, supplied by battery or solar energy |
| Working temperature | display instrument -20~+60°C, probe -20~+80°C |
| Working pressure | Standard atmospheric pressure |
| Working temperature | ≤90%RH, non-condensed |
| Process temperature | -20～+80℃ |
| Process pressure | Standard atmospheric pressure |
| Communication | Optional, 485 & 232 communication, MODBUS protocol |
| IP grade | Display instrument IP66, probe IP68 |
| Probe cable | Standard 10m, maximum
100m |
| Probe installation size | M78×2 thread is the first chose, with small transmitting
angle and small blind area of 20cm. G1-1/2 thread + matting thread, and M48×2 thread + matting thread are optional, with blind area of 30-40cm. |
| Probe material | Standard made by ABS, and anticorrosive material shall
be used for ones for the corrosive environment |
Precautions For Use:
The probe’s measuring surface needs to be perpendicular to the water surface being measured in order to use the Open Channel Flow Meter. In practical use, the probe should be fixed using a bracket. The open channel flow meter’s probe is typically positioned 0.4 meters above the greatest water level. It is important for users to make sure that the water channel they are using is free of debris and foam. Although ultrasonic open channel flow meters are useful for monitoring agricultural water, they are not very accurate when measuring solid-material sewage.
