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Home Engine system Marine Sensor Model 801 Electromagnetic Open Channel Flow Meter

Model 801 Electromagnetic Open Channel Flow Meter

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This small solid-state sensor has been designed specifically for use in open channels where fouling by weed or sewage can be a problem.

Valeport’s experience in electromagnetic technology has ensured that the Model 801 is a high precision instrument which can be relied upon to give accurate readings (±0.5% of reading plus zero stability) over a wide flow range (±5 m/sec) in only 5cm of water. The control display unit provides a choice of averaging modes, standard deviation of the data, and an optional logging facility.

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 clean water as well as dirty or difficult environments.

SPECIFICATION

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

Model 801 Electromagnetic Open Channel Flow Meter
Model 801 Electromagnetic Open Channel Flow Meter

What’s the Difference?

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.

Model 801 Electromagnetic Open Channel Flow Meter
Model 801 Electromagnetic Open Channel Flow Meter

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 display unit. CDU Express is license free.

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

 

Ordering
0801001Single Axis – Cylindrical Sensor with Control Display Unit, interface cable and operating manual in an ABS transit case.
0801002Single 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
0801003Wading Rod Set supplied with :
 3x 0.5m graduated rods, base and direction knob, in a canvas carrying bag.
0001050Top 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.
0801011Large transit case for instrument and wading rods
0300EA3External DC power option (includes DC power input lead)

Read more : miniIPS – Intelligent Pressure Sensor; CTD and Multiparameter Instruments; Current Meters And Open Channel Meters; Model 803 ROV Electromagnetic Current Meter; MIDAS ECM Self Recording Electromagnetic Current Meter

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