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"Until now, the most critical problem with traditional density measurement systems is the effect of externally induced vibration and media noise superimposed on the weights signal........"
This is potentially misleading. It needs to indicate specific technologies which are sensitive.
For example, in modern slurry measurement many will be familiar with vibrating element technologies in these applications which are not thus affected. 15:54, 23 August 2014 (UTC)MeyerMeyer (talk) The Vibrating element density meters such as the tube type from SOlartron (now Emerson) and the fork type from them also plus other vibrating element density meters are not and have not been sensitive to normal pipeline mechanical or media noise. Most such noise is in the 0-100hZ band as in this band the amplitude of the signal is very little attenuated with distance from the source. It is true that early coriolis meters were very susceptible to such noice because they were vibrated at mains frequencies (50 /60Hz). However, once they shifted to operation at resonant frequency and became able to measure density these frequencies were usually sufficiently high to be far less affected. In the case of the dedicated tube and fork density meters from Solartron they operate at typically 8-0- to 1200Hz and the Lemis DC52 vibrating element sensors at 4kHz. AT these frequencies it requires that the source of the noise is both very very close to the sensor, mechanically coupled and of high amplitude to disturb the measurement.
This section should therefore be clarified and more objective. MeyerMeyer (talk) 15:54, 23 August 2014 (UTC) The weighing method of density/solids content measurement has a history and it might be beneficial to mention it here. The Gravitrol is a U tube density meter originally manufactured by Helikainen and later by Rotameter. The U tube has flexible bellows connecting it to the main pipeline and can thus "droop" under its own weight and the weight (and hence density) of the fluid flowing through it. The U tube was maintained horizontal by a force balance system either electrical or pneumatic and the the energy required to maintain the tube was thus a function of the density/% solids or any other derived function. It would be helpful in a Wiki page for this sort of information to be included. MeyerMeyer (talk) 15:54, 23 August 2014 (UTC)
https://en.wikipedia.org/w/index.php?title=Talk:DM3_Density_Meter&action=edit&redlink=1#