Product category:
Trade effluent monitoring + on-site treatment
News Release from: Emerson Process Management - Mobrey Measurement | Subject: MSP900FH,
Edited by the Processingtalk Editorial
Team on 20 November 2007
Better performance in open channel flow
meters
The Mobrey MSP900FH, with a pre-wired remote temperature sensor, overcomes solar gain problems and can improve the accuracy of open channel flow metering systems
Emerson Process Management is offering a new version of its popular Mobrey MSP900 ultrasonic level transmitter, optimised for use in open channel flow measurement in water and industrial processing effluent flow discharge installations Many effluent treatment sites in the UK are currently reviewing their open channel flow measurement systems in order to meet MCERTS regulations which are now extended to apply to industrial processors as well as water companies
This article was originally published on Processingtalk on 22 Apr 2003 at 8.00am (UK)
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Typically, such systems consist of an ultrasonic level transmitter mounted over a flume or weir.
Used in the open air, conventional ultrasonic level transmitters are prone to suffer from inaccuracies caused by 'solar gain' when the sun shines directly on them.
The Mobrey MSP900FH transmitter has been designed to overcome this problem by using a remote temperature sensor wired directly into the transmitter.
Measuring just 10mm diameter x 25mm length, the compact sensor can easily be located in an appropriately shady spot between the liquid surface and the transmitter.
In this way, the system ensures that the air temperature measurement used in the speed of sound calculation is truly representative.
The sensor is hard-wired into the transmitter with a two-metre cable, so there is no additional cabling or set up required, and only a single connection to the controller, thus keeping installation costs to a minimum.
"We have made this development as a direct response to what our customers were telling us", explains Emerson water industry expert Peter Ward.
"It is a neat, functional answer to a common problem.
In extended field trials at a customer site, the MSP900FH consistently out-performed competitive conventional designs".
The Mobrey MSP900FH is 24V DC loop powered, supplied in a waterproof housing, sealed to IP68.
It has both analogue 4-20mA communications and digital HART options built-in, and can be used stand-alone, or as part of a site-wide measurement, control and data acquisition system.
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