Open Channel Flow Measuring

The common method of measuring flow through an open channel is to measure the height or HEAD of the liquid as it passes over an obstruction (a flume or weir) in the channel. Using ultrasonic level technology, The open channel flow meters we offer include a non-contacting sensor mounted above the flume or weir. By measuring the time from transmission of an ultrasonic pulse to receipt of an echo, the water level or "Head" is accurately measured.

Flumes and weirs are specially designed channel shapes that characterize the flow of water. Common types are Rectangular Weirs, V-Notch Weirs, Parshall flumes and Palmer Bowlus flumes. The choice of flume or weir type depends on the application: flow rate, channel shape and solids content of the water.
The open channel flow meters can be calibrated to any flume or weir by menu selection. The flow meter electronics use an internal formula to calculate flow rate (Flow = K Hn, where `K` and `n` are constants and `H` is Head as measured by the instrument). Calibration to uncommon or custom flumes can be done by direct entry of `K` and `n` constants.

Sigma Ultrasonic Open Channel flow meter

A non-contact ultrasonic open channel flow meter, with low blind area, high sensitivity, high stability. It consists of ultrasonic probe and the Control Unit, mainly used for flow measurement & flow rate in water irrigation, sewage plants, chemical enterprises sewage outfalls, and institutions.

Features
• Multiple functions, with calculating, control, transmitting and other functions.
• Match with various weirs. Right-angle triangle weir,rectangular weir,groove, parshall flume, throat channel slot.
• Accurate measurement, automatic temperature compensation function, automatic filtering system, strong anti-jamming.
• Accurate measurement in colder regions with electric heat tracing sensor.
• With IR remote control, easy to operate.
• Large screen display,double line 14 bit LCD liquid crystal display (with backlight),characters of the man-machine interface.
• With RS485 serial communication,the standard MODBUS RTU protocol,can communicate with Ethernet device,PC,PLC and DCS.
• Can provide up to 6 relays,can set the upper limit and lower limit alarm and control (instantaneous flow rate and water level),can be set high,low and fault alarms.

TECHNICAL PARAMETERS
Weir & Flume Match：Parshall Flume,Triangular Weir, Rectangular Weir, Non-throat Flume, ISO Standard：Parshall Flume
USBR Standard： Long-throat Flume (Rectangular lume, Trapezoid Flume)

Probe：4m (otherwise other range and anti-corrosion requirements,
indicate when you ordering)
Accuracy：0.2% Full span (In air)
Display Resolution： 1mm
Display： 14 Digit LCD in 2 rows
Output Current： DC4~20mA / RS485 / Hart Serial communication RS485 (modbus standard protocol)
Output Load： 0~500Ω
Output Resolution： 0.03% Full span
Relays： 2、4、5、6(5A 250VAC/30VDC)
Baud rate： 19200/9600/4800
Parameter set up： 3 induction buttons
Temperature Range： -40 ºC ~75 ºC (LCD：-20 ºC ~+70ºC)
Temperature compensation： The whole range is automatic
Pressure Range： ±0.1MP (press definitely)
Power Supply： DC24V（±5%） 0.2A
AC220V（±20%） 0.1A
Cable： Ø6-12mm
Single Wire Diameter： Ø0.5-1.78mm
Cable Fix： PG13.5/M20
Measure Cycle： 1.5second
Crust Material： ABS
Sensor Material： ABS/PVC/PTFE
Protection rating： IP67

Sigma OCFM

Wall-Mounted Partially Filled Pipe & Open Channel Flow meter

Sigma-OCFM is used to measure water velocity, depth, and flow rate of water flowing in rivers, streams, open channels and pipes.
Combining any years of experience in the development of environmental monitoring instruments, a unique ultrasonic Doppler flow meter was developed, which integrates water quality monitoring technology, mobile data communication technology, data network technology,etc. with advanced flow meter technology and Internet of Things technology as the core, and intelligently realizes the monitoring of water parameters (flow, flow rate, water level),and uploads data to the system platform according to customizable protocols.
Controller unit: The controller unit uses a 2.8 inch industrial screen display and a membrane keypadoperation mode.The unit can collect flow meter data, display it and transmit it to the outside.You can also set the relevant parameters of the flow meter, such as pipe shape, cross-sectional area, water level reference, etc.,as well as coefficient correction of measurement parameters.

SPECIFICATIONS
Controller
Flow range : 0.03m/s~10m/s
Display: 2.8" TFT color screen, resolution 240×320
Communication interface: One digital flow meter interface (24VDC+RS485)
Two switch outputs (passive, can withstand up to 24V 1A)
One RS485; One 4-20mA output; 4G IoT (by customization)
Memory capacity: 128Mbit
Electrical interface: Four PG9 waterproof connectors; One USB-Type C (reserved)
Power requirements: 100-240VAC 50/60Hz; 9-36VDC
Operating temperature: -20℃~60℃
Dimensions: 164 mm×146 mm×101 mm
Weight: 1.5kg
Installation type: Wall-mounted

Doppler Sensor
Flow range : 0.03m/s~10m/s
Measurement accuracy: Relative error ±1%, absolute error ±0.010m/s
Water level range: 0～10m
Water level accuracy: 0.5%FS
Minimum water level height: 0.02m
Temperature measurement range: 0～60℃
Temperature measurement accuracy: ±1℃
Response time: <1s
Protection rating: IP68
Power supply: 9~36VDC
Power: <0.4w
Communication interface: RS485

Applications
Suitable for open channel measurement applications such as influent flow monitoring, effluent flow monitoring, wastewater, storm water, industrial wastewater applications, and irrigation water flow measurement.

RADAR FLOW CONTINUOUS METERING FOR STREAMS & RIVERS

Sigma R-600 Radar Flow & Level Meter

Sigma R-600 employs microwave technology for non-contact measurements.
Its advanced K-band planar radar technology ensures accurate flow velocity and water level measurements without physical contact

Applications :
● River water monitoring
● Stream water monitoring
● Flood control early warning
● Reservoir flood control system
● Ecological discharge flow
● Monitoring of flow rate of agricultural water channels
● Sewage discharge control
● Process water canals
● Outlets / inlets
● Environmental Monitoring and Compliance
● Field Research and Data Collection
● Emergency Response and Rapid Deployment

Features
● 24GHz frequency modulated continuous wave (FMCW), and output measurement data of flow velocity, water level, and flow rate at the same time.
● Continuous non-contact surface velocity measurements during low, normal or high flows
● Unaffected by floating debris or suspended sediment
● IP68 waterproof (lightning protection design), not affected by bad weather and virus factors.
● With Bluetooth parameter adjustment function, it supports mobile phone APP to wirelessly configure and maintain the device on-site.
● Optional RTU function to support remote upgrade and remote maintenance of equipment.
● Built-in Vertical Angle Correction: Suitable for irregular open channels or ditches (e.g., trapezoid, round, or U-shaped).
● Weather-Resistant: Unaffected by wind, temperature, haze, sediment, or floating objects.
● Mobile App Support: Easily configure and control parameters wirelessly using a mobile phone app.
● Low power consumption, ideal for powering with solar power
● Optional Solar Power: Avoids frequent battery replacements.
● Virtually maintenance free

Technical Characteristics

Velocity Measurement System
Measuring Principle: Planar microstrip array antenna CW+FMCW
Operating Mode: Manual, automatic, telemetry
Applicable environment: 24-hour, rainy days
Operating temperature: -30~80℃
Operating Voltage: 7-32VDC;5.5-32VDC(Optional)
Working current: For 12VDC input, operating mode: <150mA
Standby mode: <1mA
Ambient temperature output: Temperature resolution 0.1℃;
temperature measurement accuracy: ±1℃
IP Rating: IP68

Radar Wave Velocity Meter
Radar power: 100mW
Radar frequency: 24GHz
Max measuring range: 40m
Velocity range: 0.03~20m/s
Velocity measurement accuracy: ±0.01m/s;±1%FS
Antenna angle: 12°
Measuring direction: Automatic recognition of water flow direction, built-in vertical angle correction

Radar Water Level Sensor
Radar power: 100mW
Radar frequency: 80Ghz(7-40m) 60GHZ (under 7m)
Measuring range: 40 meters
Measurement accuracy: ±3mm,±2mm
Antenna angle: 11°

Data transmission system
Data transmission: RS485 (default), RS232 (reserved), 4~20mA, 433MHz (optional), 4G (optional), NB-IoT (optional)