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iii. Calibration
Notes:
1.
The flow rate entered should be as close as possible to the flow rate required for the process. This is important because calibration
accuracy is dependant upon flow rate.
2.
The vessel used to measure the total volume dispensed has to be comparatively large. It should contain at a minimum the equivalent
of 10 cycles dispensed by the pump, but the larger the better.
3.
The calibration process will be iterative. It has to be repeated several times until the estimated total volume displayed by the controller
is equal to the actual total volume dispensed. This will require a minumum of three iterations, but further iterations may be required,
depending on factors such as cycle rate, pump size, volume dispensed, media, etc.
4.
To pause the calibration procedure press the START/PAUSE button. This will not cause the system to lose tally of what has already been
dispensed.
5.
The calibration procedure has to be monitored till completion. If the calibration screen is navigated away from before completion (by
selecting the other pump, or pressing any of the "NAVIGATE TO... " buttons), the calibration procedure will be cancelled.
6.
The calibration procedure is inside the password—protected menu. As such, if the procedure takes longer than 10 minutes, the calibra-
tion screen will be automatically changed. Per the previous note, the calibration procedure will be cancelled.
7.
If a "container full" (see section 2.d) condition is reached before the completion of the calibration procedure, the process will be
paused. If the "CONTAINER FULL" screen (which replaces the calibration screen momentarily) is navigated away from, the procedure will
be cancelled (see Note 5). If the process is not restarted within 10 minutes the procedure will also be cancelled (see Note 6).
If the actual volume value that is typed is invalid, an error screen is displayed.
Select "Enter Volume" and press ENTER to be taken to calibration results screen to retype the value.
The calibration procedure will not start if the pump is already running. If the calibration procedure is attempted
when the pump is running, the shown error message is displayed.
Select "Stop Pump" and press ENTER to continue to the calibration procedure. The calibration flow rate entry
screen is displayed.
If calibration is not required at this point, to exit, select "Back" and press ENTER or press either "NAVIGATE TO
PREVIOUS" or "NAVIGATE TO HOME".
iv. Output signal
The ARO Controller is capable of sending out a 4-20 mA signal that has a linear proportional relationship to the speed of the pump. The defini-
tion of the slope and crosspoint of this relationship is explained in the next step.
On the Pump Setup menu, select "Signal Out".
The lower and upper thresholds of the output signal must be correlated to actual flow values.
Type these values as indicated, press ENTER after each value .
To exit this screen, press either "NAVIGATE TO PREVIOUS" or "NAVIGATE TO HOME".
EN-5
If units other than "cycles per minute" are selected, the pump will have to be calibrated for the desired units.
Type a flow rate close to or identical to the flow rate required for the process the pump will serve. Press ENTER.
Select "Start Pump" and press ENTER or START / PAUSE button.
The pump will start running, and the screen will display an estimate of the total volume dispensed so far. If the
system is being calibrated for the first time, this value will have very little meaning.
When the calibrating vessel is full, select "Stop Pump" and press ENTER or the STOP button.
The pump will stop and the estimated total volume will be displayed.
Type the actual total volume dispensed and press ENTER.
If the calibration process has been successful, select "Complete" and press ENTER. The "Pump Setup" screen will
appear next.
If the calibration process has to be repeated, select "Recalibrate" and press ENTER. The calibration process home
screen will be displayed.
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