Instruction Manual
D200126X012
2502 Controllers
June 2017
14
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
RESET ADJUSTMENT
W5637
TYPICAL RIGHT‐HAND
MOUNTED 2502 CONTROLLER
30A8943‐H
A1933
1E8731‐C
1E8732‐C
A1897‐1
21A6447‐A
A1903
RAISE LEVEL DIAL FOR
LEFT‐HAND MOUNTING
2502C LEVEL INDICATOR WITH
RIGHT‐HAND MOUNTING
POINTER ASSEMBLY
DIFFERENTIAL RELIEF VALVE
ON BACK OF 2502 CASE
TRAVEL INDICATOR PLATE
FOR LEFT HAND MOUNTING
MOUNTING
SCREWS
ADJUSTING
SCREW
