Evoqua Wallace & Tiernan SFC-SC, Руководство пользователя, Страница: 27 / 83

WT.050.590.002.UA.IM.0614 14
SFC ANALYZER / CONTROLLER
EVOQUA W3T109634
2.3.5 positioner Calibration
If you are using a Evoqua Water Technologies positioner with feedback it is
possible to linearize the control output, for example with a gas feeder. On a gas
feeder, for example, 30% control opening does not always equal 30% dosing
capacity. Calibration of the positioner feedback allows up to eleven dosing ca-
pacity points to be aligned, in order to obtain dosing that is as linear as possible.
For this purpose, the number of support points to be calibrated can be selected
in the "Dosing“ menu - "Ym Calib.Points“. It is possible to calibrate 2, 3, 6 or
11 support points. The more support points are selected, the more accurate
the dosing is.
• Starting from the basic display, select the "Dosing“ menu.
• In the "Ym Calib.Points“ menu, select the number of calibration support
points.
• Select the "Act.Calibration.Man“ menu and confirm with the Enter key.
• The dosing outputs to be calibrated are shown on the display (max. 11).
000% 0.0 (calibration point 0% dosing)
020% 20.0 (calibration point 20% dosing)
040% 40.0 (calibration point 40% dosing)
060% 60.0 (calibration point 60% dosing)
080% 80.0 (calibration point 80% dosing)
100% 100.0 (calibration point 100% dosing)
• The calibration points can be selected using the up/down arrow keys. Press
Enter to calibrate the support points, and use the up/down arrow keys to
open/close the positioner until the actual dosing shown on the rotometer
agrees with the calibration point. Save the value by pressing the Enter key.
• Select the next calibration point and align the actuator position as de-
scribed.
NOTE: All calibration points must be aligned or checked in order to obtain
linear dosing output.
2.4 System Shut Down
CAUTION: Danger of uncontrolled chemical feed: Shut down dosing system,
close positioner!
Switch off the power supply.
!