7. Signal processing and measurement dynamics (rangeability)
It is undoubtedly one of the weak points of the flowmeter with depressurizing device that its raw signal is proportional, not to the flow rate it measures, but to its square root. This greatly reduces its measuring range, especially since, at least in the current state of the art, the current value of the signal delivered by a differential pressure transducer is subject to a fixed uncertainty in absolute value, equal to a certain percentage of the set end-of-scale value. As an example, this means that the uncertainty of a differential pressure measurement that would only be 0.5% at the end of the scale would be increased to 5% at 1/10 of this maximum value, whereas the flow variation that caused this deviation is only a factor of
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Signal processing and measurement dynamics (rangeability)
Manufacturing and installation constraints
Installation
Insert the CD ROM into the drive and double-click on "My Computer".
Double-click on the "Setup" icon.
The installation program generates a Program Files \TI\DepWin directory, but you can choose to create a different directory; an icon is also created, and placed on the "Desktop". If this is not the case, you can create a shortcut from Windows Explorer. Don't forget (if you...
Controls
Program commands can be accessed either from a menu bar or from a toolbar below. The list of commands and how to access them is :
The wording of the toolbar icons is that of the hint message that appears when the cursor is brought close to the corresponding icon.
1. File/New menu or "Reset" icon: variables on screen are completely erased. Use to perform a new calculation without...
Program description
Program
The program includes the following functional elements:
A practical note on checking integrated orifices
This note is intended for users who attempt to verify built-in orifices using the present program.
Integrated orifices are devices whose diameters are generally below the minimum limits set by ISO for pipe and primary element diameters, and which may deviate from the standard in many other respects: it is therefore by no means certain that their coefficients are...
Printing data
The DEPWIN program can print out the results displayed on the screen. To do this, simply activate the "Print" command (§ 2). A second screen appears, showing the results as they will be printed.
At the top of this screen is a toolbar:
the first three buttons from the left are zooms, allowing you to select the data display. They have no further effect...
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