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8.14 WATLOW Series 988 User’s Manual
General Software Features, Chapter 8
General Software
Input Linearization
Requirements
The square root extraction feature is standard on any Series 988 con-
troller with universal signal conditioner inputs. The linearization prompt
will appear if a process input is selected with the DIP switches (see
Chapter 1).
Overview
In many flow applications the output signal from a flow transmitter repre-
sents a squared value of the actual flow. The square root must be extract-
ed from the signal to make it useful to the operator. Many flow transmit-
ters offer this feature in the transmitter itself, but this can add significant-
ly to the cost. Using the square root extraction option in the Series 988
controller can save the operator money. The feature is enabled simply by
setting input 1 linearization [lin1] or input 2 linearization [lin2] to
square root extraction [root].
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