The change in input required to produce a full range change in output due to proportional control action. This value is the reciprocal of the proportional gain.
The amount of deviation of the controlled variable required to move through the full range (expressed in % of span or degrees of temperature). An expression of Gain of an instrument (the wider the band, the lower the gain).
The amount of deviation of the controlled variable required to move the final control element through the full range (expressed in % or ° of temperature).
Deviation necessary to produce full range of control action. If the PB is small it acts like ON / OFF controller If the PB is large it gives a greater offset: a compromise is necessary.
The amount a regulator deviates from setpoint as the flow increases from minimum to maximum. Also referred to as droop or offset.
Range of values above and below the set point; where control is full on below the band, full off above the band and proportional in between.
The "P" of PID controllers. With proportional band, the controller output is proportional to the error or a change in process variable. Proportional Band = 100/Gain.