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Stalker Surface Velocity Sensor

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Sets a new standard in OEM waterflow management

The Stalker Speed Sensor SVR is the ideal solution for OEM projects where accurate, reliable water flow measurement is a primary requirement. Backed by nearly two decades experience in microwave radar and 22 radar-related patents, the Speed Sensor SVR is self-contained in a waterproof enclosure and only needs 12 VDC to operate.

Ideally Suited for Water Flow Measurement
The Speed Sensor SVR features a rugged cast-metal exterior and the world’s most sensitive transmitter/receiver as well as miniaturized and modernized electronics. Its direction sensing software and updated algorithms position the Speed Sensor SVR as a new-generation radar ideal for the task of accurate and reliable water flow measurement. Moreover, the Speed Sensor SVR’s Ka Band performance measuring water flow is superior to the K Band used by some of its competitors’ radars.

User Adjustable Tilt Compensation
To make it better suited for measuring from elevated perspectives, the Speed Sensor SVR can be easily adjusted by the end user to compensate its speed reading based on the angle that the radar points at the target flow.

Wide Speed Range & Settings
The Speed Sensor SVR has a speed range of 0.2 m/s to 18.0 m/s – from below 1 mph to over 40 mph – with an accuracy of ±0.1 m/s. And it measures in meters/second, feet/second, miles per hour, and kilometers per hour.

Software Upgradeable
Utilizing a state-of-the-art Digital Signal Processor (DSP), the Speed Sensor SVR provides a level of performance, convenience, and accuracy previously unavailable. The DSP performs the critical filtering and timing functions required for speed measurement in its software, as opposed to hardware. This provides less unit-to-unit variation, more reliable performance, and easier maintenance. One unique feature is that it can be upgraded in the future by simply installing new software, preventing obsolescence!

And a Lot More
Adjustable tilt compensation, settings’ range, and DSP, combined with direction sensitivity, and 4 levels of sensitivity all make the Speed Sensor SVR the new standard in water flow measurement.



Stalker Traffic Control Sensor
Contact Information

Email: [email protected]






Features of the Stalker Surface Velocity Sensor

    • User adjustable tilt compensation adjusts speed reading based on angle to target.

    • Measures:
    meters/second, feet/second, miles per hour, and kilometers per hour.

    • Digital Signal Processing.

    • Senses flow direction - moving away, closing, or both directions.

    • 4 levels of sensitivity.


The Stalker Surface Velocity Sensor

General Specifications


Surface Velocity Radar Sensor
Operating Frequency 34.7 GHz (Ka-Band)
Stability +/-100 MHz
Power Requirements

Voltage: 9-24 VDC

Current: (at 12 VDC nominal)
Transmitter on: 470 mA
Transmitter off: 100 mA

Environmental Operating: -22° F (-30° C) to +158° F (+70° C) ,
90% relative humidity,
Non-operating: -40° F (-40° C) to +185° F (+85° C)
Mechanical Weight:  1.15 lb. (0.52 kg)
Diameter:  2.6 in. (6.7 cm)
Length: 4.7 in. (11.8 cm)
Case Material: Aluminum Die Cast
Accuracy +/- 0.1 m/s
Auto Self-Test Performed every 10 minutes while transmitting
Speed Range 0.2 m/s to 18 m/s

Microwave Specifications:

Antenna Conical horn
Polarization Circular
3DB Beamwidth 12° +/- 1°
RF Source Gunn-Effect diode
Receiver Type Two Direct-Conversion Homodyne receivers using four low-noise Schottky battier mixer diodes
Power Output

20 mW minimum
25 mW nominal
50 mW maximum

Power Density 2 mW/cm2 maximum at 5 cm from lens

Factory Configuration (defaults in bold)

Units ft/s (feet.sec), m/s (meters/sec), mph (miles/hour), or km/h (kilometers/hour)
Serial Port Baud Rate 9600
Serial Port Data Format Current Speed only or longer messages with speed, strength, and averages.
Communications Protocol RS-232 and RS-485

Field Configuration (defaults in bold)

Radar Zone Away, Closing or Auto directional sensitivity may be selected
Horizontal Angle Angles from 0° to 70° may be selected in 5° increments
Vertical Angle Angles from 0° to 70° may be selected in 5° increments
Sensitivity 4 levels of field sensitivity may be selected (1/2/3/4 max)


Click on the links below to download:

Stalker Surface Velocity Radar brochure

Stalker Sensor Catalog

Download setupDownloadS3SVR101exe.


REACT Application Downloads