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Watson-Marlow 620DuN and 620Du User Manual 45
and DOWN keys. Press ENTER to confirm your choice.
The pump displays a screen allowing the user to set the minimum speed of the
pump equal to or higher than the minimum available. Use the numeric keys to
set the minimum allowed speed and press ENTER to confirm the figure.
The pump returns the user to the fourth screen of the Setup menu.
18.15 Scrolling
The pump’s speed can be set, up to the maximum allowed speed and down to the
minimum allowed speed, by pressing the numeric keys or by using the UP and
DOWN keys.
The numeric keys allow the user to select a speed in increments of one-tenth of a
revolution per minute (or the equivalent in flow rate if the pump has been config-
ured to display its performance in units of flow).
The UP and DOWN keys allow the speed to be set in increments of the user’s
choice: one-tenth of a revolution per minute; one half of a revolution per minute;
one, two, five or ten revolutions per minute (or their equivalents in flow rate if the
pump has been configured to display its performance in units of flow). Each press
on UP, for example, offers a speed one increment greater than the current speed.
Note: For 0.1rpm, 0.5rpm and 1rpm settings, the increments increase progressive-
ly as long as the UP or DOWN key is continually held down.
In the fifth screen of the Setup menu select Scrolling using the UP and
DOWN keys. Press ENTER to confirm your choice.
The pump displays a screen allowing the user to set the UP and DOWN keys’
scrolling increment. Use the UP and DOWN keys to choose 0.1, 0.5, 1.0, 2.0,
5.0 or 10.0. Press ENTER to confirm your choice.
The pump returns the user to the fifth screen of the Setup menu.
Note: If the maximum allowed speed has been set to a figure which is not a multi-
ple of the chosen increment, the last active press on UP raises the speed to that
maximum rather than to the next multiple of the chosen increment. Similarly, if the
pump is running at a speed which is not a multiple of the chosen increment, the first
press on UP raises the speed to the next multiple of the chosen increment.
18.16 Date and time
The pump’s real-time clock can be set with the date and time.
In the fifth screen of the Setup menu select Date/time using the UP and
DOWN keys. Press ENTER to confirm your choice. The pump displays any pre-