Instruction Manual
D200129X012
2506/2516 Receiver/Controller
June 2017
15
To lower level or decrease density, rotate the knob in the opposite direction. The INCREASE OUTPUT PRESSURE or
RAISE LEVEL dial is graduated (in percent) to show approximate indications of the receiver/controller set point. When
making adjustments, do not rely only on the dial setting. Monitor the process fluid level to be sure the
receiver/controller attains the desired set point.
For differential gap receiver/controllers, the level setting adjustment determines the location of the gap within the
range of the sensing element.
Remote Set Point Adjustment
On a receiver/controller with remote set point adjustment capability, adjust the set point by changing the pressure to
the remote set point connection. Increase the remote set point signal pressure to decrease the receiver/controller set
point (for a direct acting receiver/controller) or increase the receiver/controller set point (for a reverse acting
receiver/controller).
Proportional Band Adjustment
For proportional and proportional‐plus‐reset receiver/controllers, the proportional band adjustment determines the
amount of change in the input pressure required to change the controller output signal from one limit of the output
signal range to the other limit (without the effect of reset action).
Proportional band is expressed as a percent of the sensing element range. That is, with a proportional band of 100
percent, an input pressure change equal to the sensing element span would change the controller output from one
limit to the other. With a proportional band of 50 percent, an input pressure change equal to one half the sensing
element range would change the controller output from one limit to the other.
The proportional valve dial is graduated from 0 to 10. A setting of 10 on the dial represents a proportional band of 100
percent; 5 represents a proportional band of 50 percent.
The receiver/controller is designed for a maximum proportional band of 200 percent. The effective band is determined
by the location of the adjustable nozzle assembly (key 17, figure 14) in the slot in the level set arm (key 28). Most
applications require a maximum band of 100 percent so, at the factory, a receiver/controller unit is set to the 100
percent value. This setting places the nozzle at a point that is halfway between the bellows assemblies. To adjust the
proportional band, rotate the adjustment counterclockwise to broaden the setting. Rotate the adjustment clockwise
to narrow the setting.
In some applications, a 200 percent proportional band range may be required. To obtain the 200 percent range, move
the nozzle assembly to the extreme right end of the slot in the level set arm.
For differential gap receiver/controllers, the proportional band adjustment determines the width of the differential
gap. This is the difference between the input pressures at which the controller output switches from zero to full supply
pressure and back to zero.
Reset Adjustment (2516 Receiver/Controller Only)
On proportional‐plus‐reset receiver/controllers, the reset adjustment determines the time in minutes required for the
reset action to produce a change in output pressure equal to the change that has occurred due to proportional band
action.
To adjust the reset action, rotate the adjustment clockwise to decrease, or counterclockwise to increase the minutes
per repeat. Increasing the minutes per repeat provides a slower reset action.
Anti‐Reset Windup Valve Adjustment (2516F Receiver/Controller Only)
The anti‐reset windup valve provides differential pressure relief. Its adjustment control extends from the back of the
receiver/controller case (figure 16).
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