6527 Starflow QSD
The Unidata 6527 Starflow 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 Unidata IP 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, low maintenance, low power, no calibration and 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.
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 |
| Operating Temperature | 0°C to 60°C water temperature |
Velocity and Depth Specifications
| 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 |
|---|---|
| Velocity Accuracy | ±1% typical |
| 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 | 0°C to 60°C |
| Temperature Resolution | 0.1°C |
| Flow Computation | Flow rate, totalised flow with companion NRT/NRL |
| Channel Type | Pipe, open channel, natural stream |
| Cable | 15 metre, 6 way |
| Cable Options | User specified up to 50 metres |
Electrical Specifications
| Power Source Typical | External Battery 12V – 24V DC |
|---|---|
| Power Usage | 10V to 24V DC, 50µA standby, 100mA active for 1 sec |
| SDI-12 | SDI-12V 1.3 recorder (1200 baud smart instrument channel) |
| RS 485 | Modbus RTU |
