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MSP900SH
Installation, Operation & Maintenance Manual
IP2040/IM, Rev. AA
May 2007
It is important to note that the bottom reference of the transmitter should be related to the centre of the invert of the primary
device, NOT the distance to the channel bottom directly below the transmitter.
In addition to the above, when setting the bottom reference on a ‘V’ notch weir it is important that the true invert of the weir is
taken and not the meniscus liquid level, which may be 3 to 4mm above the true invert.
• The liquid surface at the point of measurement must have a stable, smooth surface and uniform approach velocity. It
must not be affected by baffles, foam, hydraulic jumps or any other object likely to cause flow disruption.
• The primary element should be free from any situation where it is likely to ‘drown’ (refer to relevant standard for further
information)
• The MSP900SH transmitter has integral temperature compensation and must be protected at all times from direct
sunlight and any radiated heat.
For maximum accuracy and stability of level measurement reading the transmitter should always be shrouded to
prevent the incidence of direct sunlight.
If the flow structure permits, mount the transmitter within the flow channel or chamber.
Hmax
Hmax
Transmitter
bottom
Flow
Channel
invert
Primary element (eg.
Flume, weir) invert
Transmitter
bottom reference
True invert
Meniscus