All of our slack loop control systems include a feature called 'Offset'. What offset does is explained in our manuals. I'll reiterate the basics here, but add some notes as to its judicious use. Normally, the control signal created by the loop control varies linearly from the bottom of the control range to the near limit. With offset, there is a discontinuity in the signal at the low limit. Once the low limit is broached, the signal jumps to some set percentage of full scale. The percentage is set with the DIP switches on the control (see your manual for details). This feature is most useful when the amount of slack material in the draped loop is modest and the[...]
