Portable Doppler Open Channel Flow Meter
Doppler Open Channel flow meter can be used to measure the liquid flow rate of the pipe which is partially filled with liquid.
Principle: Use Doppler frequency shift to measure the flow velocity, it is suitable for measuring the fluid which contains solid particles or bubbles, not suitable for measuring pure water.
Application scope: City pipe network, underground sewage testing, sewage treatment plants, streams and rivers testing.
Portable type Doppler Open Channel flow meter consists of a portable flow calculator and a transducer. The transducer consists of a flow velocity sensor, a water depth sensor of ultrasonic principle, a water depth sensor of pressure principle and a conductivity sensor, which are separately used to measure flow velocity, depth, and conductivity of water in rivers, streams, open channels and pipelines.
Composition of the transducer:
Detailed illustration for the transducer as follows:
1) Water flow velocity measurement uses ultrasonic Doppler principle in Quadrature Sampling Mode. The flow sensor transmits ultrasonic energy through its epoxy case into the water. The suspended sediment particles or small gas bubbles in the water reflect some of the transmitted ultrasonic energy back to the flow sensor’s ultrasonic receiver which processes this received signal and calculates the water flow velocity.
2) Two methods for water depth measurement. One method is using the top mounted ultrasonic sensor in the transducer to measure water depth. Another method is using the bottom mounted pressure sensor in the transducer to measure water depth. User should select the suitable water depth measuring method according to the on-site condition.
3) In the transducer, there is a conductivity meter which has 4 conductivity electrodes which expose to the water at the top of the transducer. When the transducer is working, the conductivity electrodes continuously measure the conductivity of the water for user analyzing the nature of the water in open channels or pipes.
● Rechargeable battery can work up to 50 hours.
● The fluid must contain a certain amount of air bubbles or suspended solid particles
● 20 coordinate points to describe cross section of the river’s shape.
● Measurement of flow velocity, depth and conductivity of fluid
● Flow Velocity Range: 0.02 ~ 0.8m/s, 0.02 ~ 1.6m/s, 0.02 ~ 3.2m/s, 0.02 ~ 6.4m/s, 0.02 ~ 13.2m/s, bi-directional, accuracy 1%.
● Depth can be measured by the pressure sensor or ultrasonic level sensor principles.
● Depth Range: 0.02 to 5 m (for ultrasonic principle, error: ±1mm); 0 to 10m (for pressure principle, error: ±2mm).
● Measurement of flow velocity in both forward flow and reverse flow.
● With coordinate correction and pressure compensation function.
● IP68 Epoxy-sealed body design of transducer, long time working under water.
● RS485 communication (MODBUS protocol) optional, for connecting to the upper computer.
Technical data of Transducer:
|Velocity:||Velocity range :||0.02 ~ 0.8m/s, 0.02 ~ 1.6m/s, 0.02 ~ 3.2m/s, 0.02 ~ 6.4m/s, 0.02 ~ 13.2m/s, Bidirectional|
|Velocity accuracy:||±1% measured velocity|
|Range:||0.02 to 5 m|
|Resolution:||± 1 mm|
|Range:||0 to 10 m|
|Resolution:||± 2 mm|
|Temperature：||Range:||0°C to 60°C|
|Electrical Conductivity (EC):||Range:||0 to 200,000 µS/cm, Typically ± 1% of measurement|
|recorded as a 16-bit value (0 to 65,535 µS/cm) or a 32-bit value (0 to 262,143 µS/cm)|
|Range:||±70° in roll and pitch axes.|
|Accuracy:||±1° for angles less than 45°|
|Output:||SDI-12:||SDI-12 v1.3, Max. cable 50m|
|RS485:||Modbus RTU, Max. cable 500m|
|Environmental：||Operating temperature:||0℃ ~+60℃ water temperature|
|Storage temperature:||-20℃ ~+60℃|
|Others：||Cable:||The standard cable is 15m, the maximum option is 500m.|
|Sensor material:||Epoxy-sealed body, Marine Grade 316 Stainless Steel Mounting Bracket|
|Sensor size:||135mm x 50mm x 20mm (L x W x H)|
|Sensor weight:||1kg with 15m of cable|
Technical data of Flow calculator:
|Power supply:||Calculator:85-265 VAC (Charging battery)|
|IP class:||Calculator: IP66|
|Operating temperature:||0℃ ~+60℃|
|Case material:||Fiber Glass|
|Display:||4.5” color LCD|
|Output:||Pulse, 4-20mA（Flow & Depth）,RS485 (Modbus), Datalogger|
|Application:||Partially Filled Pipe: 150-6000mm; Open Channel: width >200mm|
Partially pipe Pipe with siltation on bottom
Triangle Channel Rectangular channel
Polygonal channel Irregular-shaped channel
Answer : Please send your question or enquiry to our email: email@example.com, we will forward the questions to the related engineer.
Answer : Please communicate with the sales about the return procedure before returning product.
Answer : The delivery time depends on the order quantity and product specification. If the product’s specification is conventional ( not special ), delivery time is 5 or 7 working days for order quantity ≤ 10 pieces; delivery time is 2 or 3 working weeks for order quantity 15 ~ 30 pieces.
Answer : by Courier, by Sea or by Air
Answer : Yes, Generally warranty is one year.
Answer : From year 2015 to year 2021, average annual sales is RMB 350 million ( about USD 54.7 million )