Type 812 Doppler Velocity Flowmeter
Valeport’s Type 812 is a self-contained continuous wave doppler flowmeter that offers industry-standard performance coupled with robust build quality and reliability, all backed up by Valeport’s exceptional customer service and support mechanisms.
It incorporates all of the low noise electronics to drive propriety Digital
Signal Processing techniques that provide measurements in both waste
and clean water with flow rates as low as 0.01ms-1 and up to 5 ms-1. Even
in very shallow water (0.15 to 0.20m) accuracies of better than 0.01ms-1
can be achieved.
The Type 812 has its own height | surface lookup tables. With a real-time
height data interface (Modbus or SDI-12), flow can be calculated directly.
Used stand-alone or as part of an integrated solution the Type 812 is
compatible with 3rd party data loggers, telemetry and SCADA systems:
• SDI-12 | RS232 | RS485-Modbus RTU direct from the unit.
The Type 812 derives a quality figure for the calculated flow measurement.
The level of integrity of flow measurement is calculated using two factors:
Flow Balance and Signal Level. The Flow Balance is an indication of
how laminar the flow is, while the Signal Level is the spread of point
measurements compared to the final calculated flow value over a period
of observation. A quick, simple metric that gives you confidence in the
system’s performance.
Key Features:
- High accuracy velocity measurement even in very shallow water
- Low power consumption
- Bi-directional flow measurement
- Digital signal processing and filtering
- Velocity measurement: temperature and sound speed correction
- Integrated temperature
- Direct data output:
Open Protocol – Velocity | Quality Metric | Volume (with level input) - Expert mode for data diagnostics
- 3 year warranty
Operations:
Open Channel and Pipeline flow monitoring for:
- Industrial & Treatment plants | Wastewater networks | Sewers | Canals | Rivers | Streams
- Trade Effluent & Discharge surveys – Diagnostics
- Flow check surveys
- Flood & CSO monitoring
- Stand-alone & Integrated solutions
- Permanent installation
- Temporary deployment
Software
Technical Specifications
Sensor
The Type 812 Flowmeter measures the flow of water using the principle of Doppler shift. A signal of 1MHz
is transmitted from a dedicated transmit transducer, the reflected signal is received at a dedicated receive transducer. The change in frequency is resolved using DSP techniques and a flow speed determined. The speed of sound in water, important for accurate doppler shift determination, can be a fixed value or constantly updated through temperature observation and a user defined conductivity value.
Operational Performance
to a maximum of 5.0 ms-1
Resolution Less than 0.5 ms-1 ±0.01 ms-1
Greater than 0.5 ms-1 ±2%
with uniform velocity profile and known water conductivity
Resolution 0.001 ms-1
(note 1 - Field performance is site specific)
to a maximum of +85º C
Accuracy ±0.5º C
Resolution 0.5º C
Transducers to be fully wetted
Electrical
operating: 25mA
(at 12 V)
Polyurethane cable with integral strain cord
Termination:
Bare leads
Amphenol: 62GB-56T12-10SN (metal)
Souriau: UTS6JC12E10S (plastic)
(in 10 metre steps)
Operational Characteristics
to a maximum of +60º C
to a maximum of +70º C
ºC | ºF
• Multi-measurement
• Continuous measurement
• RS232 \ # commands
• RS485 \ Modbus RTU
• SDI-12 \ SDI-12
Physical Characteristics
Breadth 46 mm
Height 19 mm
Calibration
The Type 812 is tested to an in-house specification. These tests are conducted using procedures defined by the manufacturer
Software
Valeport Water supply Valeport’s Configure Windows software for instrument set up
Ordering
Product Enquiry
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