The 6527 QSD SDI-12 and Modbus Instrument is used to measure water velocity, depth and temperature 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 6527 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 6527 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 6527 Instrument’s ultrasonic receiver instrument that processes this received signal and calculates the water velocity. The 6527 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 6527 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 6527 instrument’s low profile form factor minimises disturbance to the flow it’s measuring. Furthermore, 6527 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 Accuracy: ± 1% typical Depth Range Ultrasonic Sensor: Depth Range Absolute Pressure Sensor: 0 to 10m Temperature Power Specifications Communications Environmental Physical
Brochures Manual Application NotesFeatures
Overview
Technical
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
Resolution: 1mm/s
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 Accuracy Absolute Pressure Sensor:
Typical ± 0.19% for 0m to 5m range
Typical ± 0.38% for 0m to 10m range
Range: 0°C to 60°C
Resolution: 0.1°C
Voltage Range: 10 to 24V DC
Supply Current: 50uA standby, 100mA active for 1s
Power Source (typical): External battery 12V DC
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
Operating Temp: 0°C to 60°C water temperature
Storage Temp: -20°C to 85°C
Humidity: 100%
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 50mDocuments
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