SQ-R + Non-Contact Radar Flow Discharge Monitoring System

SQ-R Non-Contact Radar Flow Meter for Wastewater, Sewers, and Process Water Monitoring

The SQ-R continuously measures flow rate without contacting the water, making it an ideal solution for effluent channels, partially filled pipes, and technical ducts in industrial and municipal water systems. Because the sensor is mounted above the water surface, it is not affected by debris, grease, or entrained solids that commonly interfere with submerged flow sensors.

With its compact design and versatile mounting options, the SQ-R is especially well suited for installation in manholes, sewers, wastewater treatment facilities, and other confined monitoring points. It is designed for municipal and industrial applications such as monitoring influent flow at wastewater treatment plants, supporting process control, and helping allocate wastewater costs. It can also be used to record the frequency and duration of rain and flood events, providing valuable data for sewer system management and utility operations.

The SQ-R is easy to install under bridges, on extensions, on sewer ceilings, or inside manholes. Its non-contact measuring technology allows for simple installation above the flow, easy access for maintenance, and reliable long-term operation without the risk of clogging or blockage.

For sewer manhole applications, a specially designed adjustable mounting bracket is also available.

• Non-contact measurement, maintenance-free system

• Calculation of discharge by continuous measurement of flow velocity and water level

• No construction measures necessary in the sewer

• Waterproof and resistant housing also for use in aggressive environments

• Wide measuring range from a few liters up to several cubic meters per minute

• High data availability even with intensive turbidity and high solids content

• Easy integration into existing measuring and control systems

• Self-check function supports correct installation and high data quality

• Versatile measurement output via RS-485, Modbus, SDI-12, pulse and analog signal

• Integrated hydraulic model for precise flow calculations

• Easy configuration with SQ-Commander software

Flow velocity

A 24 GHz radar sensor measures the velocity of the water surface. Radar impulses are transmitted at an angle towards the water surface where ripples and waves induce a Doppler frequency shift that is detected by the SQ-R.

Water level

A radar sensor measures the distance between the SQ-R and the water surface by registering the travel time of an impulse sent towards the water surface. An ultrasonic level sensor is available on request.

Water Discharge

The discharge Q is computed by the SQ-R:

Q = vm * A (h)

The SQ-Commander manages all your monitoring and configuration tasks with an attractive user interface.

• Create or import a cross-sectional profile

• Communicate with your SQ-R+ locally and remotely

• Configure and update the sensor settings

• View your measurement data

• Validate your data with the velocity diagnostics tool

• Transfer data files to HTTP and FTP servers

• Install the SQ-R+ with easy step-by-step guidance

GENERAL

• Dimensions 272 x 153 x 186 mm (1 bracket for pipe with Ø 30 mm)

• Total weight 1.55 kg

• Protection class IP 68

• Power supply 6 ... 30 V DC

• Power consumption 1.5 Ah per day (for a measurement interval of 60 s)

• Operating temperature -40…85 °C (-40…185 °F) C

• Storing temperature -40° ... 60° C

• Protection over voltage protection, reverse power protection, lightning protection

LEVEL MEASUREMENT

• Measuring range 0.05 ... 8 m (0.16…26.25 ft)

• Radar frequency 80 GHz (W-band)

• Beam angle 8

• Near field blanking 0.05 m

• Resolution ≤ 2 mm

VELOCITY MEASUREMENT

• Measuring principle Doppler-radar

• Measuring range 0.08 ... 16 m/s (depending on flow conditions)

• Accuracy +/- 0.01 m/s; +/- 1 % FS

• Resolution 1 mm/s

• Direction recognition +/-

• Measuring duration 5 ... 240 sec.

• Measuring interval 8 sec. ... 5 h

• Measuring frequency 24 GHz (K-Band)

• Radar opening angle 12°

• Distance to water surface 0.05 ... 35 m (0.16...114.83 ft)

• Required minimum swell 3 mm

AUTOMATIC VERTICAL ANGLE COMPENSATION

• Accuracy +/- 1°

• Resolution +/- 0,1 °

INTERFACES

Analogue Outputs:  4 x 4 ... 20 mA

• 1 x water level

• 1 x flow rate 

• 1x flow velocity

• 1x self check

Pulse Output: Pulse per volume (selectable units)

Digital Interfaces 

1 x SDI-12; 1 x RS 485 or Modbus

Transfer rate: 1.2 to 115,2 kBd

Protocol: various ASCII-protocols

Output: discharge, flow velocity, water level, quality parameter

What is the SQ-R+ used for?
The SQ-R+ is used for continuous, non-contact flow measurement in wastewater channels, sewer systems, industrial water applications, effluent channels, and other open channel flow monitoring locations.

Does the SQ-R+ require a flume or weir?
No. The SQ-R+ is designed to measure open channel flow without requiring a flume or weir, which can help reduce installation complexity and cost.

How does the SQ-R+ measure flow?
The SQ-R+ uses non-contact radar technology to measure flow velocity and water level, allowing it to calculate discharge continuously without touching the liquid.

Can the SQ-R+ be used in wastewater and sewer applications?
Yes. Because it is installed above the flow and does not contact the water, the SQ-R+ is well suited for wastewater, sewage, and other dirty water applications where debris, grease, and solids may be present.

Where can the SQ-R+ be installed?
The SQ-R+ can be installed in manholes, sewer networks, effluent channels, partially filled pipes, ducts, and other open channel flow applications where non-contact measurement is preferred.

What are the advantages of a non-contact radar flow meter?
A non-contact radar flow meter helps reduce fouling, clogging, and maintenance compared to submerged flow sensors. It is ideal for harsh applications where reliability and low maintenance are important.

Can the SQ-R+ integrate with SCADA, PLCs, or data loggers?
Yes. The SQ-R+ is well suited for integration with SCADA systems, PLCs, and data loggers for remote monitoring and process control applications.

Is the SQ-R+ a good choice for confined or hard-to-access locations?
Yes. Its compact design and flexible mounting options make it a strong solution for manholes, sewers, and other difficult installation points.

For more accurate information please contact AWM Instruments today.

(One SQ-R W/ 20 M Cable)

11X9X19 Inches @ 10 LBS

(27X24X47 CM @ 4.5 KG)

(One Stainless Steel V4A Mounting Bracket Without Adjustable Tube)

33X25X7 Inches @ 40 LBS

SHIPPING NOTE: Orders for two or more systems which include the manhole installation bracket are considered oversize and will be shipped by LTL Freight.