Operating Manual

Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave
3-18 TN Technologies
Note: Only one volume break table can be defined. The same volume break table
can be applied to more than one segment.
For heights which fall between the values entered in the break table, the gauge interpolates
between the table values to compute the volume. The more points you enter, up to the
maximum of 16, the more accurate your volume reading will be.
There are two types of break point tables, a first order break table (Vol = 1st order break
tab of height) and a second order break table (Vol = 2nd order break tab of height). The
first order break table uses linear interpolation between the points in the table to determine
the volume, while the second order break table uses a second order (non-linear)
interpolation method.
If the sides of the tank are curved and the surface area of the process material increases or
decreases smoothly as level increases, then a second order break table can provide more
accurate volume readings. If the tank shape is complex, a first order break table will often
provide better results. In any case, the accuracy of the volume readout will depend on the
accuracy of the volume vs. height values entered by the user in the break table.
Tank Volume Set up Menus
The tables in this section show the “tank volume setup” menu items in the order they are
presented to the user.
Note: The appearance of each screen in the following table is just an example.
The actual appearance (words and numbers) will vary with context and
user selections/entries.
The first table shows the “tank volume setup” menu items when one of the basic tank
shapes is selected. The next table show the menu items which are displayed when “other
shapes or compound shapes” is selected.