Function Generator - ABB Platinum standard Series Product Instruction

DESCRIPTION AND OPERATION
entered for the primary lower range value, the primary upper
range value must be 30 plus 60, or 90 in. H O.
2
3. The secondary lower range value is the empty volume of
the tank (always zero).
4. The full volume of the tank is calculated to be 306 gallons
for the secondary upper range value.
2 3 3
π r ×
volume of a cylinder l in. , and in. gallons
= 0.004329 =

Function Generator

The function generator is a curve consisting of six straight line
segments programmed into the transmitter via the Type STT
terminal. This makes it possible to program the output to fol-
low the input in a way that is specific to a certain application.
The first and last points of the curve (P0 and P6) are pre-
defined at zero-percent input and output, and 100-percent
input and output respectively. The other five points (P1, P2,
P3, P4, and P5) are user defined. Refer to Section 5 of this
instruction and the Type STT Smart Transmitter Terminal
Instruction for more information on the function generator.
Figure 2-9 shows a function generator used to control the out-
put of a Type PTSDDA pressure transmitter. This transmitter
has a nominal range of zero to six-inches of water. In the
example in Figure 2-9, the calibrated range is from -0.50 to
+0.50 inches of water (calibrated span of 1.0 inch of water).
The function generator is used to provide a full scale output
(zero to 100 percent) for a -0.05 to +0.15 furnace pressure
draft range. This is a common draft range for paint ovens used
in the automobile or appliance industry, slab reheat furnaces
in the steel industry, and glass tanks in the glass industry.
FUNCTIONAL OPERATION
WBPEEUI110504A0 2 - 11