Differential – Watlow Series 988 Enhanced User Manual
Page 7
WATLOW Series 988 Enhanced Software Features
7
Requirements
Two inputs and the enhanced software option are required.
Overview
Differential control allows the Series 988 to control one process at a
difference to another process. Input 2 acts as a remote set point input.
However the displayed set point indicates the desired difference between
input 1 and input 2. The set point that input 1 will use is determined by
the equation:
internal set point = input 2 + differential set point
The lower display shows the differential set point, which can be adjusted
with the increment (up-arrow) and decrement (down-arrow) keys.
Please note that while in the differential control mode the internal set
point for input 1 cannot be viewed and must be calculated with the
equation.
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