Starflow QSD Ultrasonic Flow Logger 6527L

• Integrated Depth and Velocity Flow logger
• Dual depth measuring available; Ultrasonic and Pressure
• Low profile form
• Barometric reference module available
• Flowmeter display option available
• SDI-12 compatible
  
• Easy to use
• Robust, reliable – completely sealed against water ingress
• Inexpensive – to buy, install and operate
• Easy to web-enable – with Neon telemetry data loggers
• Easy to install – compact, will easily fit most structures
• Low maintenance – no battery changes or calibration required
• Low power consumption
  
• Records Flow in streams, open channels and part-filled pipes.
• Battery Powered for use in remote locations

The successor to the highly succesful Starflow ultrasonic flow logger, the 6527L is an improved smaller version of th eold favourite. Using Starlog 4 software and the built-in logger, cross-section profiles can be defined to calculate flow rate and total flow. The software also includes a diagnostics package which is extremely useful during the installation process. For customers with the 6527L who also want it to operate as an SDI-12 sensor, we have a special scheme to stop the logger and allow SDI-12 to command to trigger the measurement while the internal Scheme is running. The measurement interval is controlled by the scheme scan frequency. Some customers see this as a good backup solution, if the main, perhaps telemetered data logger stops for any reason, the Starflow QSD 6527L logger will continue logging, providing a fallback position so data is not lost. There is a large flash memory space available within the Starflow QSD. It can store perhaps years of data points in flash memory, and that memory is retained even if the power to the unit is interrupted.

The new 6527L comes with a USB RS485 converter and StarlogV4 (Lite) version to create a scheme for the internal logger and to download data from the internal logger to a PC. The product was released in July 2023. The Starflow QSD 6527 manual details how to use the internal logger function.

The 6527L is robust, reliable and easy to use. It is completely sealed against water ingress, requires low maintenance, low power, no calibration and there are no fussy power arrangements required.

Ultrasonic Doppler Principle in Quadrature Sampling Mode is utilised to measure water velocity. The 6527 transmits ultrasonic energy through its epoxy casing into the water. Suspended sediment particles or small gas bubbles in the water reflect some of the transmitted ultrasonic energy back to the 6527’s ultrasonic receiver instrument that processes this received signal and calculates the water velocity.

The 6527L Starflow QSD incorporates an ultrasonic depth sensor and an absolute pressure depth sensor. An ultrasonic depth sensor measures the water depth using the ultrasonic principle and has a range of up to 5m. An absolute (non-vented) pressure sensor measures pressure forces applied to the strain gauge. Pressure sensor reports a value equal to the sum of the water
pressure and the atmospheric pressure above the water.

In order to compensate for the atmospheric (barometric) pressure fluctuation, the 6527L Starflow QSD should be connected to the 6515 Starflow QSD barometric reference. The absolute
pressure sensor has a range of up to 10m. Having sensors using different depth measurement methods provides flexibility in depth measurement.

The 6527L’s low profile form factor minimises disturbance to the flow it’s measuring. Furthermore, the 6527 measures velocity in both directions and is suitable for use in a wide range of water qualities, from sewage to potable water, seawater too.

Simply mount it on, or near the bottom of the water channel and you are ready to measure.

PHYSICAL SPECIFICATIONS
MATERIAL: Epoxy-sealed body, Marine Grade 316 Stainless
Steel Mounting Bracket
SIZE: 135mm x 55mm x 22mm (LxWxH)
WEIGHT: 1kg with 15m of Cable
DATA LOGGER: 8MB flash memory
(About 6 years log data recording @ 15min interval)
VELOCITY RANGE:
20mm/sec to 0.8 m/sec
20mm/sec to 1.6 m/sec (default)
20mm/sec to 3.2 m/sec
20mm/sec to 13.2 m/sec
Bidirectional velocity capability, set using SDI-12 /Modbus commands
VELOCITY ACCURACY: ±1% typical
DEPTH RANGE:
Ultrasonic Sensor:
20mm up to 5m above top surface of the instrument
40mm up to 5m from base of the instrument
DEPTH ACCURACY: Typical ±1%
DEPTH RANGE: Absolute Pressure sensor: 0 to 10m
DEPTH ACCURACY: Typical ±0.19% for 0m to 5m range, Typical ±0.38% for 0m to 10m range
TEMPERATURE: 0°C to 60°C
TEMPERATURE RESOLUTION: 0.1°C
FLOW COMPUTATION: Flow rate, Totalised flow – Scheme defined
CHANNEL TYPE: Pipe, open channel, natural stream
CABLE: 15 metre, 6 way
CABLE OPTIONS: User specified up to 50 metres

ELECTRICAL SPECIFICATIONS
POWER SOURCE: External Battery 12V – 24V DC
POWER USAGE: 10V to 24V DC, 50μA standby, 100mA active for 1 sec
SDI-12: SDI-12V 1.3
RS 485: Modbus RTU

Brochures
6527L Starflow QSD Ultrasonic Doppler Flow Monitoring Instrument 2922_1
6515 Barometric Reference Module

Manual
Unidata-Manual-6527B-and-6537A-Starflow-QSD-User-Manual-08-05-2023

Application Notes
CSIRO Remote Stream Gauging System Design
Irrigation Channel Measurement and Control
Flood Monitoring / Flood Alerts
Rivers and Streams Monitoring
Surface Water Monitoring
Industrial Outflow Monitoring