MODEL 801 SINGLE AXIS ELECTROMAGNETIC FLOW METER
Single Axis Electromagnetic Flow Meter Model 801
Incorporating years of experience in electromagnetic technology to the 801 single axis flow meter. This small solid-state sensor has been designed specifically for use in open channels where fouling by weed or sewage can be a problem.
Our knowledge has ensured that the 801 is a high precision instrument which can be relied upon to give accurate readings.
We offer a choice of two sensors to suit different applications; the flat sensor is suitable for use in very shallow water, while the cylindrical sensor is particularly suited to turbulent or dirty conditions. Both sensors have an accuracy of +/-0.5% of reading (+5mm/sec), and a wide measurement range of +/-5m/s
The 801 is unaffected by changes in conductivity and can be used in a range of fluids including fresh and waste water, salt water or foodstuffs.
The digital control unit, supplied with the instrument, gives readings of velocity (real-time and average), standard deviation and allows full sampling and averaging setup, and logging of data.
For field use, the rugged case protects the probe and surface unit, and the tough canvas bag means that the wading set is easily carried.
The Model 801 is compatible with the full range of hydrological gauging accessories, and is designed for use as a standard wading unit, or in a permanent installation. continue with: A choice of optional output formats, and OEM availability, means that the Model 801 can be interfaced to almost any logging device to suit all of your flow measurement needs.
DESCRIPTION The electromagnetic flow meter is based on Faraday's Law that a conductor [water or any other conducting fluid] moving in a magnetic field [produced by a coil in the sensor] produces a voltage [measured by a pair of electrodes].
The electrodes on the flat sensor are on the top surface of the sensor, so flow is measured above this surface. The sampling volume is a small cylinder whose diameter is the distance between the electrodes, and whose height extends approx. 10mm above the surface of the sensor.
The electrodes on the cylindrical sensor are on the side of the sensor. The sampling volume is a sphere around the body of the sensor, of approximately 120mm diameter.
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, indicated by 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.
The flow rate is indicated on the control unit, which can also log the data, up to a maximum of 999 records. The control unit is also used to set-up many other parameters such as the sampling and averaging periods.
The logged data can be easily exported to PC using RS232 communications, and on line averaged readings are also available via RS232. The addition of an optional PCB also allows on line output via +/-5v, 4-20mA, or 0-10kHz protocols.
System has integral zero and gain stability checks which result in high calibration stability.
Rugged Carrying Case
Control Display Unit
Wading Set Heavy-duty Roll Bag
Instrument 0801001 Single axis cylindrical sensor, c/w 2m cable, control display unit (with logging facility), and operation manual. Supplied in ABS transit case.
0801002 Single axis flat sensor, c/w 2m cable, control display unit (with logging facility), and operation manual. Supplied in ABS transit case.
0801507 Alternative output board. Converts RS232 output to +/-5v, 4 – 20mA, or 0 – 10kHz signals.
0801003 Wading rod set c/w 3 x 0.5m graduated rods, base, direction knob, and canvas carrying bag
0300012 Cable for extracting logged data to PC (can also be used for real time data interface)