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Magnesonics Model MSC 900 Open Channel Flow Measurement

In OCF applications, the level transmitter is mounted upstream of the channel restriction or obstruction in accordance with the recommended standards.

These standards also define the relationship between the liquid level at that point and the flow through the channel.

The popular V-notch weir (512) and Venturi flume (3/2) flow laws which have been used for many years are pre-programmed in the MSC900 control unit, along with other popular flow laws.

Where flow measurement has to be in accordance with BS3680 or the Environmental Agency requirements (EA consented flows), the MSC900 has a 20 point look-up table which can be programmed with a dedicated stage discharge curve for the flow structure.

If the user does not have the curve available, Magne-Sonics offer to calculate the curve for certain structures based on dimensional and flow data provided by the user. A data sheet is produced detailing ail of the MSC900 parameters and their values which require programming, together with a projection of the uncertainty for the specific application.

• 1 V-Notch
• 1 Venturi flumes - Rectangular - Semi-circular - Trapezoidal
• 1 Triangular profile (Crump) weirs 1 Broad crested weirs
• 1 Flat V weirs
• 1 Parshall flumes 1 Manning formula - Round pipe - Rectangular channel

In many instances, it is required that the flow and totalised flow be logged for download at a later date.

The MSCLOG system has an on­board logger which can log up to 4800 samples at user definable intervals. In the event of flow exceeding a limit value, fast logging is automatically triggered until the flow reverts to normal.

In addition, 60 midnight totalised flow values are also logged along with the maximum instantaneous flow during each 24 hour period. All data is real time stamped and stored for download via an RS232 connection on the control unit.

Data can be collected using a portable PC, and is easily stored and manipulated using the LogView windows software.

The MSC900 control relays may be allocated as flow rate alarms or may be selected to operate as a pulse output to an external totaliser. There is also the facility to allocate a relay as a low- flow cut off so that totalisation errors are avoided in very low flow conditions.  The current output is proportional to flow rate and is used for remote monitoring, telemetry or local recorders.

The system will totalise flow and show both instantaneous flow and totalised flow on the display, in different units of measurement if required.

There is also the facility to connect up to two digital (voltage free contact) inputs to the system which may be used to inhibit measurement or force alarms or other routines to start upon external signals.