QSD Flow and Conductivity SDI-12 Instrument

• Integrated 4 electrode electro conductivity instrument (EC)
• Barometric reference module available
• Flowmeter display option available
• SDI-12 and MODBUS 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 
• Low power consumption
  
• Records Flow in streams, open channels and part-filled pipes.
• Battery Powered for use in remote locations

Based on the 6527, QSD flow instrument, the 6537 Starflow QSD SDI-12 and Modbus Instrument has a 4 electrode electro conductivity instrument (EC) included to measure the quality of the water. Water quality is measured on an ongoing basis and this parameter can be recorded along with velocity and depth to better analyse the nature of the water in open channels and pipes. Conductivity is a very important water quality measure and any spike on the conductivity is a strong indicator of a pollution event.

The 6537 QSD Instrument is used to measure water velocity, depth, temperature and conductivity of water flowing in rivers, streams, open channels and large pipes. When used with a companion data logger, flow rate and total flow can also be calculated.

The 6537 Instrument 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 6537 Instrument 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 6537 Instrument’s ultrasonic receiver instrument that processes this received signal and calculates the water velocity.

The 6537 Starflow QSD incorporates 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 pressure sensor measures pressure forces applied to the strain gauge. The absolute, non-vented, 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 6537 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 6537 instrument’s low profile form factor minimises disturbance to the flow it’s measuring. Furthermore, 6537 instrument 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.

Velocity
Range:
20mm/s to 0.8m/s
20mm/s to 1.6m/s in one direction (default)
20mm/s to 3.2m/s
20mm/s to 13.2m/s
Bidirectional velocity capability, set using configuration tools

Accuracy: ± 1% typical
Resolution: 1mm/s

Depth Range Ultrasonic Sensor:
20mm up to 5m above top surface of the instrument
40mm up to 5m from the base of the instrument
Depth Accuracy Ultrasonic Sensor :Typical ± 1%

Depth Range Absolute Pressure Sensor: 0 to 10m
Depth Accuracy Absolute Pressure Sensor:
Typical ± 0.19% for 0m to 5m range
Typical ± 0.38% for 0m to 10m range

Temperature
Range: 0°C to 60°C
Resolution: 0.1°C

Conductivity (6537 Only):
Range: 0-200,000uS/cm Typically ±1% of measurement, returned either as
16-bit value (0 65535uS/cm) or 32-bit value (0-262,143uS/cm)
Compensation Conductivity (6537 Only):
25°C default / set using configuration tools

Power Specifications
Voltage Range: 10 to 24V DC
Supply Current: 50uA standby, 100mA active for 1s
Power Source (typical): External battery 12V DC

Communications
SDI-12: Velocity, depth, temperature and diagnostic features
RS 485: Modbus RTU
Connection: Single three-wire cable up to 50m long
Software: Compatible with Starlog V4

Environmental
Operating Temp: 0°C to 60°C water temperature
Storage Temp: -20°C to 85°C
Humidity: 100%

Physical
Dimensions: L 135mm x W 55mm x H 22mm
Material: Epoxy-sealed body, stainless steel mounting plate
Weight: 1Kg with 15m cable
Cable: 15m, three wire
Cable Options: User specified length up to 50m

Brochures
6527B-Starflow-QSD-Ultrasonic-Doppler-Velocity-and-Depth-Instrument
6515-Barometric-Reference
6537A-Starflow-QSD-Ultrasonic-Doppler-Velocity-Depth-Conductivity-Instrument
DOF6000-Series-Flowmeter-for-QSD-48196527

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