SOR Multi Point RF Level Switch - Manual (Page 2)

2/36 Form 677 (05.13) ©SOR Inc.
Adjustable Differential Set Points
Models 665 through 668 include an adjustable differential set point. For the adjustable dif-
ferential set point, the adjustable differential relay is controlled by two limits. The adjustable
differential relay changes state when process level reaches the upper limit of the adjustable
differential set point.
Model 661
Adjust Pot 1
Term Strip 1
Model 662
Adjust Pot 1
Term Strip 1
Adjust Pot 2
Term Strip 2
Model 663
Adjust Pot 2
Term Strip 2
Adjust Pot 3
Term Strip 3
Model 664
Adjust Pot 1
Term Strip 1
Adjust Pot 2
Term Strip 2
Adjust Pot 3
Term Strip 3
Adjust Pot 4
Term Strip 4
Adjust Pot 1
Term Strip 1
Adjust Pot 2
Adjust Pot 3
Term Strip 2
Adj Diff
Adjust Pot 1
Term Strip 1
Adjust Pot 3
Adjust Pot 2
Term Strip 2
Adj Diff
Model 665
Adjust Pot 4
Term Strip 4
Adjust Pot 2
Term Strip 2
Adj Diff
Adjust Pot 3 Adjust Pot 3
Term Strip 2
Adj Diff
Adjust Pot 2
Adjust Pot 1
Term Strip 1
Model 666 Model 667 Model 668
Adjust Pot 4
Term Strip 4
The adjustable differential
relay maintains its state until
process level falls below the
lower limit of the adjustable
differential set point. When
process level falls below the
lower limit of the adjust-
able differential set point,
the adjustable differential
relay contacts return to their
original state.
The upper limit can be set
anywhere on the probe by
adjusting potentiometer (pot)
2. The lower limit can be set
anywhere on the probe by
adjusting potentiometer (pot)
3. The adjustable differential
set point provides a single
set of contacts to control
cut—in and cut—out of fill-
ing (or emptying) equipment.
Model 666 through 668 sensing level configurations provide an adjustable differential set
point for vessel level control as well as one or two fixed differential set points for Hi—Hi
and Lo—Lo level alarm or shutdown circuits.
Sensing Level Confi guration
The number of set points and their configuration depends upon the model number speci-
fied for manufacture. Compare the first three numbers from the nameplate model number
to
to find the sensing level configuration for the unit to be installed.
Models 661 through 664 provide fixed, narrow differential set points only. For each fixed
differential set point, relay operation is centered on a single point. After set up, the single
point of relay operation can be set anywhere on the probe by adjusting the appropriate set
point potentiometer (pot).