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Hawk Flow Meter Sizing: Acoustic and Radar Non-Contact Level-Velocity Systems for Channels
Quick Answer
Hawk flow meter sizing for open channels uses level and velocity data from acoustic or radar sensors. Silver Automation Instruments supplies non-contact level-velocity systems for channels from 0.2 m to 30 m wide. Send us your channel width, level range, velocity range, and output preference for a sized quote.
Silver Automation Instruments. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
What Acoustic and Radar Non-Contact Systems Measure
Many plants ask us about Hawk flow meter sizing because they have a concrete channel or flume and cannot shut down flow. Acoustic and radar systems do not touch the water. Acoustic sensors measure velocity by Doppler shift. Radar sensors measure surface level with microwave pulses. The flow computer combines level and velocity with channel geometry.
Here is the thing. A correct sizing exercise is not just about pipe diameter. Channels are open. The level changes. The velocity profile changes with flow. Engineers need to check the sensor frequency, beam angle, and mounting height.
Acoustic vs Radar Level-Velocity Systems for Channels
Acoustic velocity sensors often work well in water with small particles or bubbles. Radar level sensors perform better in foam, steam, or high humidity. Silver Instruments supplies both types. We have seen a wastewater plant in Southeast Asia use acoustic sensors for concrete channels with 0.3 to 2.5 m depth. A separate chemical plant in Egypt chose radar because the channel had heavy vapor and occasional foam.
Do not assume one technology fits all. Acoustic velocity needs a minimum depth. Radar level needs a clear vertical distance from the sensor to the water surface.
Key Sizing Inputs for Channel Flow
These are the numbers we ask for when a customer requests Hawk flow meter sizing or a Silver Instruments alternative.
Channel width and shape. Tell us the width at the bottom, the slope, and whether the channel is rectangular, trapezoidal, or a Parshall flume.
Level range and zero point. Give the minimum and maximum water level. The zero point should match the sensor mounting position.
Velocity range. State normal and maximum velocity. Acoustic sensors often cover 0.03 m/s to 6 m/s. Radar level sensors can cover level up to 30 m or 70 m depending on the antenna.
Flow range. Calculate the expected minimum and maximum flow rate in m³/h or L/s. The flow range sets the resolution and accuracy class.
Water composition. Tell us if the water has solids, oil, grease, or chemicals. The water composition changes the acoustic signal and the radar dielectric constant.
Output and power. Choose 4-20 mA HART, Modbus RS485, pulse, or relay outputs. Most Silver Instruments channel systems accept 24 V DC or 220 V AC.
Flow Calculation for Acoustic and Radar Systems
The flow computer uses the continuity equation. Flow equals average velocity times cross-sectional area. The area changes with level. For a rectangular channel, area equals width times level. For a Parshall flume, the level-to-flow table is stored in the electronics.
Because the velocity sensor measures surface velocity, not the average velocity, the flow computer applies a velocity index. This index is usually between 0.85 and 0.95 for concrete channels. Silver
Recommended Silver Instruments Models for Channel Applications
For acoustic non-contact level-velocity systems, we recommend the Silver Instruments SIL-AC-LV100. This model has a Doppler velocity sensor with a 1 to 20 m measurement range. Level accuracy is ±0.25 percent of full scale. Velocity accuracy is ±0.5 percent of reading. Output is 4-20 mA HART plus Modbus RS485. The sensor is IP68 rated.
For radar non-contact level-velocity systems, the Silver Instruments SIL-RD-LV80 fits channels with foam, vapor, or corrosive conditions. Radar level range is 0 to 30 m with ±3 mm accuracy. The antenna is PTFE sealed. The electronics support 4-20 mA HART and Modbus RS485. This model suits chemical plants, paper mills, and food wastewater.
Both models can be paired with a local flow display and a totalizer. We also supply panel-mounted or field-mounted transmitters. If the site needs hazardous area approval, ask for ATEX Zone 1 or Zone 2 option.
Installation Notes for Accurate Sizing
Mounting location matters more than sensor brand. Do not install a velocity sensor near a bend, gate, or pump discharge. Allow 5 to 10 straight channel lengths upstream for stable flow. For radar level, make sure the beam avoids walls, ladders, or cables.
Most engineers skip this part. The sensor must be above the maximum flood level. A lightning strike or submersion kills the electronics. Use a stilling well or a mounting bracket that allows sensor removal without entering the channel.
Heavy rain in Southeast Asia and tropical coastal sites can create foam. Radar systems handle this better than acoustic level sensors. But acoustic velocity sensors still work if the foam is thin and the particles remain in the water.
FAQ
Q1. Can Silver Instruments match Hawk flow meter sizing for existing channels?
Yes. Send us the Hawk model number, channel dimensions, level range, and velocity range. We will size a Silver Instruments non-contact system with equivalent or better accuracy.
Q2. What is the price of an acoustic channel flow meter?
Price depends on channel width, sensor type, output, and hazardous area class. A basic acoustic level-velocity system for a 0.5 to 2 m channel starts around 2,000 USD. Radar systems start around 2,800 USD. Ask for a formal quote with your project details.
Q3. Do these systems work in partially full pipes?
Yes. Acoustic and radar non-contact systems can measure open channel flow in partially full pipes if the pipe slope and diameter are known. The flow computer uses level to calculate the wetted area.
Q4. What maintenance do non-contact channel flow meters need?
Keep the sensor face clean. In wastewater, clean the acoustic sensor every 4 to 8 weeks. In clean water, inspect every 6 months. Radar antennas are mostly maintenance free unless grease or dust builds up.
Q5. Can I use these systems in an irrigation canal with variable backwater?
Yes. You can add an upstream level sensor or use a radar velocity model. Silver Instruments can configure a two-level input to compensate for backwater conditions.
Send us your water type, channel width, level range, velocity range, and output preference. Our engineers will reply within 24 hours with a sizing sheet and price. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
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