Starflow Ultrasonic Doppler Instrument Model 6526
Unidata ultrasonic Doppler instrument is a compact, easy-to-use system for measuring the velocity and depth of water in rivers and streams, open drainage channels, and large pipes. It is suitable for use in a wide range of water qualities ranging from sewage and wastewater to clean streams, potable water and even seawater.
The instrument measures forward and reverse flow conditions and may be programmed to computer flow rate and total flow in pipes and open channels.
The ultrasonic transducer assembly is profiled to reduce flow disturbance. It is designed to be placed at (or near) the bottom of the water channel for upstream measurement. A single cable connects the instrument to a 12V DC power source.
Water velocity is measured by the ultrasonic Doppler principle which relies on suspended particles or small air bubbles in the water to reflect the ultrasonic detector signal. The instrument will not operate in very clean, degassed water. Water depth is gauged by a hydrostatic pressure sensor, referenced to atmospheric pressure through the vented power and signal cable.
Physical Specifications
| Material | PVC body, Marine Grade 316 Stainless Steel Mounting Bracket |
|---|---|
| Size | 290mm x 70mm x 30mm (LxWxH) |
| Weight | 2kg with 15m of Cable |
| Operating Temperature | 0°C to 60°C water temperature |
Velocity, Depth and Flow Specifications
| Velocity Range | 21mm/s to 4500mm/s bi-directional |
|---|---|
| Velocity Accuracy | 2% of measured velocity |
| Velocity Resolution | 1mm/s |
| Depth Range | 0m to 5.0m |
| Depth Accuracy | Typical ± 0.25% |
| Temperature | -17°C to 60°C |
| Temperature Resolution | 0.1°C |
| Flow Computation | Flow rate, totalised flow |
| Channel Type | Pipe, open channel, natural stream |
| Cable | 15 metre, 9 way vented <> compatible |
| Cable Options | User specified up to 50 metres |
Electrical Specifications
| Power Source Typical | External Battery 12VDC |
|---|---|
| Power Usage | 11.5V to 15V DC, 50µA standby, 200mA active, 90mA communications |
| Control | 1 x CMOS output trigger – water sampler |
| Communication | 1 x RS232C Baud rates: 300/1200/2400/4800/9600/19200/38400 |
| SDI-12 | SDI-12V 1.3 recorder (1200 baud smart instrument channel) |
Integrated Logger Specifications
| Storage Memory | Low power CMOS RAM 512k standard |
|---|---|
| Time Clock | Crystal regulated, +/- 10 seconds/month |
| Scan Rates | Programmable from 5 seconds to 5 minutes |
| Log Intervals | Programmable from 5 seconds to 24 hours |
| CPU | 80C552 microcontroller, 14.7456 MHz |
