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Stevens - Surface Velocity Radar (SVR) Sensor
SVR is a non-contact method for measuring surface flow velocity in open channels. The SVR uses radar technology to measure the Doppler shift of electromagnetic waves reflected from the water surface. The Doppler shift is proportional to the water’s surface velocity and can calculate the velocity of water at various depths.
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General
- Measurement Range: 0.05 to 15 m/s. Depending on flow conditions
- Speed Selection: Default is meters / second. Feet / second is an option
- Flow Direction: Bi-directional | Measures backwater situations.
- Measurement interval: Up to 1 measurement per second
- Resolution: 0.1 mm/s (0.0001 ft)
- Accuracy: +- 2% of measured value
- Radar frequency: 24 GHz (K-band)
- Radar opening angle: 12 degrees Azimuth
- 24 degrees Elevation
Power
- Power supply:
- 4-20 mA
- 600 ohms @ 24 VDC
- 150 ohms @ 12 VDC
- 4-20 mA with (2) NPN outputs
- Power /current consumption active:
- Typical 112 mA at 12 VDC
- ~ 5 second warmup. 30 to 60 seconds for measurement output (depending on flow conditions)
- Maximum current: 250 mA
Sensor Input and Positioning
- Serial interface: RS-485
- Protocol: MODBUS
- Vertical distance to water surface: 0.5 to 15 m (1.64 to 82 feet) minimum depending on wave height
Environmental
- Operating temperature: -40°C to 85°C (-40°F to 185°F). Battery charging protected below 0°C.
- Housing: IP 68
- Lightning protection: Gas Discharge Tubes on sensor inputs
Physical
- Dimensions (L x W x H): 134.5 mm (5.3 in) x 114.5 mm (4.5 in) x 80 mm (3.2 in) [without mounting bracket]
- Weight: 0.756 kg (1.67 lbs)