NON-CONTACT-DISCHARGE-RADAR-RQ-30-RQ-30A

NON-CONTACT DISCHARGE RADAR RQ-30 / RQ-30A

Name: Testingindonesia
Rating: 5

Category: Water Discharge Monitoring Tags: alat ukur debit air, jual alat ukur debit air, rq-30, rq-30a, water discharge, water discharge instrument, water discharge monitoring

Description

NON-CONTACT DISCHARGE MEASUREMENT BY MEANS OF RADAR TECHNOLOGY FOR OPEN RIVERS

The RQ-30 is a sensor for continuous discharge measurement of rivers, open channels and canals with known cross-section profile. The sensor uses innovative radar technology to measure velocity, water level and discharge. It enables reliable, non-contact measurement without the need for structural work in the water.

FIELDS OF APPLICATION

The RQ-30 enables discharge measurement for rivers, streams, open channels and canals for which continuous monitoring is desired. Thanks to the non-contact radar technology the measuring equipment is not susceptible to contamination, debris or driftwood in the water. Furthermore, the non-contact measurement warrants very low maintenance and fail-safe operation especially during high water or flooding.

IMPLEMENTATION

The sensor can be simply mounted on bridges, on the roofs of closed canals or channel superstructures. The bed of the water should be as stable as possible in order to warrant consistent measurement. A visible swell must be evident on the surface of the water.

MEASURING PRINCIPLE

The non-contact radar technology determines the water surface flow velocity using the Doppler frequency shift method and furthermore the water level is established by a travel time measurement. With known cross section profile the discharge Q of the water can then be calculated on basis of the continuity equation: Q = vm · A (h)

Features

Non-contact, maintenance free measurement system
No structural work is necessary in the water
No threat to the system through flooding
Low power consumption enables operation using solar cells
Recognition of flow direction
Measuring range 0.08 - 16 m/s (depending on the flow conditions)
Recognition of hysteresis-effects
Measurement in backwater situations
Measures even where weed growth prevails and sensor is not affected by turbidity
Measurement in tidal waters
Automatic angle measurement
Optional (RQ-30a): analogue outputs from 4 to 20 mA

Spesification

GENERAL

Dimensions: 338 mm x 333 mm x 154 mm
Total weight: 5.4 kg
Protection class :IP 67
Power supply: 6 - 30 V
Power consumption at 12V: standby approx. 1mA; active operation approx. 140mA
Operating temperature: -35 - 60°C
Miscellaneous: over voltage protection, reverse power protection, lightning protection

WATERLEVEL MEASUREMENT

Measurement range: 0 - 15 m standard version / 0 - 35 m extended version
Resolution: 1 mm
Radar frequency: 26 GHz (K-Band)
Radar opening angle: 10°

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: 5 - 240 sec.
Measurement interval: 8 sec. - 5h
Measurement frequency: 24 GHz (K-Band)
Radar opening angle: 12°
Distance to water surface: 0.50 - 35 m
Necessary minimum wave height: 3 mm

AUTOMATIC VERTICAL ANGLE COMPENSATION

Accuracy: +/- 1°
Resolution: +/- 0.1°

INTERFACE

Analogue Output (RQ-30a): 4 x output 4 - 20 mA for water level, velocity, discharge and AUX
Digital Interface: 1 x SDI-12; 1 x RS 485 or Modbus
- Transfer rate: 1.2 to 115.2 kBd
- Protocol: various ASCII-protocols
- Output: water level, velocity and discharge, quality parameters

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