Transmitter
front face
Flow
Channel invert | Primary device (eg. |
| flume, weir) invert |
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 (1/8”) above the true invert.
Transmitter bottom
reference
Meniscus | 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 MSP400RH 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. Alternatively, the MSP400RH transmitter can accept an input from an external temperature sensor. See section 3.3.1.
If you are in doubt about any aspect of transmitter installation, contact Mobrey (Service Division) who will be pleased to advise.
9 | IP2046/IM | |
Nov 2006 | ||
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