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Model 801 – EM Flow Meter

The Model 801 Electromagnetic Flow Meters measure the speed of water in Open Channel environments with exceptional accuracy.

Two sensor types are available, to suit different application requirements, but both offer excellent durability, reliable, accurate data and are suitable for use in all water-based environments.


Support

Model 801 Datasheet
Model 801 EM Current Meter Operating Manual
CDU Express Operating Manual

Software

CDU Express
C3

Technical Specifications

Specifications

Model 801 - Cylindrical Type

Range:
-5m/s to +5m/s
Accuracy:
±0.5% of reading plus 5mm/s
Zero Drift:
<5mm/s
Sensing Volume:
Sphere of approx. 12cm around sensor
Minimum Depth:
15cm

Model 801 - Flat Type

Range:
-5m/s to +5m/s
Accuracy:
±0.5% of reading plus 5mm/s
Zero Drift:
<5mm/s
Sensing Volume:
Cylinder of approx. 20mm Ø x 10mm high
Minimum Depth:
5cm

What’s the difference between Flat and Cylindrical?

The smaller sampling volume of the flat sensor makes it very much more suitable for shallow flows, or measurements in confined spaces. However, it is also very much more sensitive to turbulent flows, which may manifest as apparently noisy real time readings. This effect can be minimised by using a long (>30secs) average period. The larger sampling volume of the cylindrical sensor effectively eliminates the turbulence noise, but also means that a greater depth of water is required for measurements.

Data Acquisition

The Model 801 Flow Meters are supplied with a dedicated Control Display Unit that both drives the sensor and provides data display of the measured water velocity. Data is updated at 1Hz, and may be averaged over any number of seconds from 1 to 600. The display will show real-time speed data at a resolution of 1mm/s, as well as the result of the data average, and a Standard Deviation figure to give added data confidence. A solid state memory records all results (up to 999 averaged readings), and the data may be downloaded to PC using the RS232 interface lead supplied.

Calibration

Both instruments are calibrated at Valeport’s own premises up to speeds of 1m/s. Higher speed measurements are based on linear extrapolation. Specific high speed calibrations can be arranged at a third party facility on request.

Control Display Unit

Size:
244mm x 163mm x 94mm, 2kg
Environmental:
Sealed to IP67
Power:
8x alkaline C cells, up to 37 hrs operation
Operating Temp:
-5°C to +50°C (display unit)
-5°C to + 40°C (sensor)

Configuration

Both instruments are available for use as hand held “Wading Sets” only, with the operator standing in the channel, holding the instrument in position. The system is supplied with 1.5m wading rod (3x 0.5m sections), graduated in cm, and a 3m cable from instrument to display unit. Alternatively, a “top-setting” wading rod system is available, which allows the vertical position of the instrument to be set without removing the wading rods from the water.

Software

System is supplied with CDUExpress Windows-based PC software, for data extraction from the display unit. CDU Express is licence free.

Shipping

Standard:
62 x 42 x 34cm, 9kg (wading set)

Ordering

0801001
Single Axis - Cylindrical Sensor with Control Display Unit,
interface cable and operating manual in an ABS transit
case
0801002
Single Axis - Flat Sensor with Control Display Unit, interface
cable and operating manual in an ABS transit case
The above systems are supplied with:
· 2, 5 or 12m cable (different lengths on request)
· Wading rod set
3x 0.5m graduated rods, base and direction knob, in a
canvas carrying bag

Options

0801003
Wading Rod Set supplied with:
· 3x 0.5m graduated rods, base and direction knob, in a
canvas carrying bag
0001050
Top Setting Wading Rod Set for use with standard wading
rod set consisting of:
· 3x 0.5m graduated rods and necessary mounting
brackets, in a canvas carrying bag
0801011
Large transit case for instrument and wading rods
0300EA3
External DC power option (includes DC power input lead)

Product Enquiry

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