Reset Adjustment - Emerson Fisher 2502 Instruction Manual

2502 Controllers
June 2017
adjustment is performed by opening the controller cover and turning the percent proportional band knob (just below
the RAISE LEVEL dial).

Reset Adjustment

To adjust reset action (figure 9) turn the knob clockwise to decrease reset time (the minutes per repeat). Turn the
knob counterclockwise to increase the minutes per repeat. Increasing the minutes per repeat provides a slower reset
action.
The reset rate adjustment dial is calibrated in minutes per repeat. By definition, this is the time in minutes required for
the reset action to produce a correction which is equal to the correction produced by proportional control action. This
is, in effect, the time in minutes required for the controller to increase (or decrease) its output pressure by an amount
equal to a proportional increase (or decrease) caused by a change in control conditions.
Figure 9. Controller Adjustments
LEFT‐HAND MOUNTING
RESET ADJUSTMENT
W5637
TYPICAL RIGHT‐HAND
MOUNTED 2502 CONTROLLER
14
RAISE LEVEL DIAL FOR
MOUNTING
SCREWS
21A6447‐A
A1903
DIFFERENTIAL RELIEF VALVE
30A8943‐H
A1933
2502C LEVEL INDICATOR WITH
RIGHT‐HAND MOUNTING
ADJUSTING
SCREW
ON BACK OF 2502 CASE
Instruction Manual
POINTER ASSEMBLY
1E8731‐C
1E8732‐C
A1897‐1
TRAVEL INDICATOR PLATE
FOR LEFT HAND MOUNTING
D200126X012