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 Unidata 6537 Starflow QSD SDI-12 and Modbus Instrument has a 4 electrode electro conductivity instrument (EC) included for measuring 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.
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 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 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 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 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: | External Battery 12V – 24V DC |
| POWER USAGE: | 110V to 24V DC, 50μA standby, 100mA active for 1 sec |
| SDI-12: | SDI-12V 1.3 |
| RS 485: | Modbus RTU |
