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Additional Information
The SQ-R+ continuously measures flow rate without contacting the water. Designed for effluent channels, partially filled pipes, and industrial and municipal water systems, it combines radar measurements of surface velocity and water level to calculate flow. Mounting the sensor above the water helps prevent fouling from debris, grease, and solids that can interfere with submerged sensors.
Its compact design and flexible mounting options make it well suited for sewers, manholes, and wastewater treatment facilities. Applications include monitoring influent and effluent flow, supporting process control, and measuring wastewater volumes for cost allocation. It also provides flow data during rain and flood events to support sewer system management.
The SQ-R+ can be mounted under bridges, on extension arms, or overhead inside sewers and manholes. Installation above the water keeps the sensor accessible for inspection and reduces maintenance associated with submerged equipment. An optional adjustable mounting bracket is available for sewer manhole installations.
SQ-R+ Technical Specifications
| Measurement | |
|---|---|
| Method | Non-contact radar level and surface velocity; onboard hydraulic flow calculation |
| Practical velocity range | 0.08–16 m/s; depends on surface conditions |
| Velocity accuracy | ±0.01 m/s with ±1% FS |
| Velocity resolution | 1 mm/s |
| Flow direction | Positive and negative |
| Measurement duration | 5–240 seconds |
| Measurement interval | 8 seconds–5 hours |
| Velocity radar | 24 GHz; 12° beam |
| Velocity sensor distance | 0.05–130 m to water surface |
| Level sensor distance | 0.05–8 m (0.16–26.25 ft) to water surface |
| Level accuracy | ≤2 mm |
| Level radar | 80 GHz; 8° beam |
| Angle compensation | Automatic; ±1° accuracy |
| Outputs & Power | |
| Digital interfaces | RS-485 ASCII / Modbus RTU; SDI-12 |
| Analog outputs | Four 4–20 mA channels: level, velocity, flow rate, self-check; 250 Ω maximum load |
| Pulse output | Volume-based pulse output |
| Supply voltage | 9–30 VDC |
| Power consumption | 1.5 Ah/day at 12 VDC with 60-second measurement interval |
| Construction & Environment | |
| Protection rating | IP68 |
| Operating / storage temperature | −40 to 185°F (−40 to 85°C) |
| Housing | Zytel 103HSL NC010 |
| Dimensions | 10.71 × 5.99 × 7.30 in (272 × 152.2 × 185.5 mm), including mounting cube |
| Weight | 3.42 lb (1.55 kg) |
| Mounting | Mounting cube for 30 mm diameter pipe |
SQ-R+ Applications
Wastewater Treatment
Monitor influent flow to support treatment plant operations and process control.
Sewer Networks
Track sewer flow and wastewater volumes to support system management and cost allocation.
Manhole Monitoring
Measure flow at sewer access points using compact, above-water installation.
Effluent Channels
Continuously monitor discharge in open effluent channels without immersing the sensor.
Partially Filled Pipes
Measure flow in partially filled pipes using radar level and surface velocity measurements.
Industrial Process Water
Monitor flow in industrial water channels and process water circuits.
Standard Communication Interface for Seamless Integration
Analogue outputs: 2 x 4 ... 20 mA
1 x water level
1 x flow rate or flow velocity
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
Optional Remote Monitoring Systems | Data Loggers and Displays
Your SQ-R requires an external data logger or telemetry system for optimal functionality, Please take a moment to review the options outlined below, or feel free to contact us directly for additional alternatives that may better suit your specific needs. We are here to assist you in finding the best solution for your application.
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