NON-CONTACT VELOCITY RADAR RG-30 / RG-30A | WATER FLOW SENSOR

NON-CONTACT VELOCITY RADAR RG-30 / RG-30A | WATER FLOW SENSOR

RADAR SENSOR FOR CONTACT-FREE VELOCITY MEASUREMENT

The flow velocity sensor RG-30 has been designed for contact-free measurements of the surface flow velocity of rivers and channels by means of radar technology.

Description

The flow velocity sensor RG-30 has been designed for contact-free measurements of the surface flow velocity of rivers and channels. The sensor is mounted above the channel, there it radiates the radar signal inclined about 60° to the water surface. The reflected radar signals from the water surface are received, analyzed and converted into the average surface velocity.

Measurement flow velocity

The measurement of the flow velocity is based on the principle of the Doppler frequency shift. Due to the comparison of the radiated frequency and the reflected frequency from the water surface, the local flow velocity is determined.

Measurements in hard to reach areas

The choice of the measurement location determines the quality of a measurement. By simply mounting the sensor on bridges, ceilings of closed channels or any superstructures of the channel, now locations can be selected that were previously difficult to achieve. The most important criterias are the quality of the measuring point of the profile, the water surface and the flow conditions.

The stability of the profile is the determining factor in order to ensure a constant measurement. The water surface must neither be completely smooth nor extremely upset, but there should be a visible swell of the water surface. Stones, swirls, steps or standing waves should not be within the measuring area. Depending on the condition of the water surface, the maximum mounting height above the water surface is 130 m, but a minimum distance of 0.5 m should be maintained.

FEATURES AND ADVANTAGES

Maintenance free
No structural work is neccesary in the water
Simple integration into existing systems
No threat to the system through flooding
Low power consumption
Recognition of flow direction
Measuring range 0.08 … 16 m/s (depending on the flow conditions)
Near blanking zone 0.5 m
Non-contact and fast measurement
Own measurement interval or externally triggered
Independent of environmental influences

FIELDS OF APPLICATION

The radar sensor RG-30 is used by hydrolography and water management. It is applied for example in open rivers, streams or channels. It is especially suitable for measurement tasks where the usage of conventional respectively contact intense measurement systems is problematic. As for example at measuring spots which are hard to reach or carry highly turbid water. It is installed outside the water and measures without direct contact to the same. Hence, the system requires no maintenance and works reliably even during high flow, floodings or despite of debris, driftwood or high turbidity.

IMPLEMENTATION

The sensor impresses with low power consumption and its high reliability for permanent recording of the flow velocity. The compact design and the contact-free measurement principle by means of radar technology allows easy and uncomplicated mounting and usage.

MEASURING PRINCIPLE

The measurement of the flow velocity is based on the principle of the Doppler frequency shift. The sensor emits a radar signal and compares its frequency with the one of the reflected signal from the water surface. The frequency is shifted proportional to the surface flow velocity. Those signals are collected, evaluated and the medial surface flow velocity is determined.

TECHNICAL DETAILS

GENERAL

Dimensions 241 mm x 246 mm x 154 mm
Total weight 2.7 kg
Protection class IP 67
Power supply 6 … 30 V
Power consumption at 12V standby approx. 1 mA; active operation approx. 110 mA
Operating temperature -35 … 60°C
Miscellaneous Protection over voltage protection, reverse power protection, lightning protection

VELOCITY MEASUREMENT

Measurement range 0.08 … 16 m/s (depending on flow conditions)
Accuracy +/- 0.01 m/s; +/- 1 % FS
Resolution 1 mm/s
Direction recognition +/-
Measurement duration single measurement 5 … 240 sec.
Measurement interval 8 sec. … 5h
Radar frequency 24 GHz (K-Band)
Radar opening angle 12°
Distance to water surface 0.50 …130 m
Necessary minimum swell 3 mm

AUTOMATIC VERTICAL ANGLE COMPENSATION

Accuracy +/- 1°
Resolution +/- 0.1°

INTERFACE

Analogue output (only at RG-30a) velocity 4 … 20 mA; 0 … 10 m/s configurable
Interface 1 x RS 485 or Modbus; 1 x SDI-12
Digital input 1 x trigger input low: 0 … 0.6 V; high: 2 … 30 V

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