Open Channel Flow Meter from China Manufacturer

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Ultrasonic flow meter

Water Flow Meter

Water treatment

Liquid flow meter

Introduction

Application

Technical data

Installation

Introduction

PLCM open channel flow meter is an economical solution for open channel measuring， which measures level, flow rate and total volume of water flowing through weirs and flumes. The meter includes a non-contact ultrasonic level sensor to detect the water level and then calculates the flow rate and volume using the Manning equation and characteristics of the channel.

Advantages

Open Channel Flow Meter Advantages and Disadvantages
Economical and reliable. The accuracy of change in level is 1 mm.
Suitable for a variety of weirs and flumes, Parshall flumes (ISO), V-Notch weirs, Rectangular weirs(With or Without End Contractions) and custom Formula type weir;
Displays flow rate in L/S , M3/h or M3/min;
Clear display with Graphical LCD(with backlight) ;
The cable length between probe and host up to 1000m;
The probe with leak-proof structure and IP68 protect grade;
Chemically resistant probe materials for maximum application flexibility;
Provided 4-20mA output and RS485 serial communication (MODBUS-RTU) output;
Provided programmable 6 relays at most for alarms;
Three button for programming or remote control for easy configuration and operation（opt.）;

Application

PLCM open channel flow meter is well suited for applications ranging from flow into water treatment plants, storm and sanitary sewer systems, and effluent from water resource recovery, to industrial discharge and irrigation channels.

Water Resource Recovery

Irrigation Channel

River

Industrial Discharge

Irrigation Channel

Urban Water Supply

Technical data

Power Supply	DC24V (±5%) 0.2A; AC220V (±20%) 0.1A ;Optional DC12V
Display	Backlit LCD
Flow Rate Range	0.0000~99999L/S or m3/h
The maximum of Accumulative Flow	9999999.9 m3/h
Accuracy of Change in Level	1mm or 0.2% of full span (whichever is greater)
Resolution	1mm
Analogue Output	4-20mA, corresponding to instantaneous flow
Relays Output	Standard 2 relay outputs(Optional up to 6 relays)
Serial Communication	RS485, MODBUS-RTU standard protocol
Ambient Temperature	-40℃~70℃
Measure Cycle	1 second (selectable 2 seconds )
Parameter Setting	3 induction buttons / remote control
Cable gland	PG9 /PG11/ PG13.5
Converter Housing Material	ABS
Converter Protection Class	IP67
Sensor Level Range	0~4.0m ;other level range also available
Blind zone	0.20m
Temperature Compensation	Integral in probe
Pressure Rating	0.2MPa
Beam Angle	8° (3db)
Cable Length	10m standard (can be extended to 1000m)
Sensor Material	ABS, PVC or PTFE (optional)
Sensor Protection Class	IP68
Connection	Screw (G2) or flange (DN65/DN80/etc.)

Installation

Open channel flow meter Hints for probe mounting
1. The probe can be supplied as standard or with a screw nut or with an ordered flange.
2. For applications requiring chemical compatibility the probe is available fully enclosed in PTFE.
3. The use of metallic fittings or flanges is not recommended.
4. For exposed or sunny locations a protective hood is recommended.
5. Make sure that the probe is mounted perpendicular to the monitored surface and ideally, at least 0.25 meters above it, because the probe cannot get response in the blind zone.
6. The probe has a 10 inclusive conical beam angel at 3 db and must be mounted with a clear unobstructed sight of the liquid to be measured. But smooth vertical sidewalls weir tank will not cause false signals.
7. The probe must be mounted upstream of the flume or weir.
8. Do not over-tighten the bolts on flange.
9. The stilling well can be used when there is volatility in the water or needs to improve the accuracy of level measurement. The still well connect with the bottom of the weir or flume, and the probe measures the level in the well.
10. When install to the cold area, should choose the lengthen sensor and make the sensor extend into the container, shun frost and icing.
11. For Parshall flume, the probe should be installed in a position the 2/3 contraction away from the throat.
12. For V-Notch weir and rectangular weir, the probe should be installed on the upstream side, the maximum water depths over the weir and 3~4 times away from the weir plate.

Simple setup for flumes and weirs
Selectable pre-programmed formulas for flumes, weirs and other geometries

Except above standard flumes/weirs, it also can work with non-standard
channel such as U shape Weir, Cipolletti Weir and user self-defined weir.