Watson-Marlow 720UN and 720SN User Manual
52
The display counts down as the dose proceeds and stops when the dose is com-
plete.
If
STOP
is pressed during dosing, the pump stops and returns the user to the
MemoDose percentage screen.
Press the
STOP
key twice within half a second if you wish to exit MemoDose and re-
turn to manual operation.
17.1 Changing dosing speed
The user must exit MemoDose in order to change pump speed. After returning to
MemoDose, the pump dispenses the previous dose size at the new speed.
Press the
STOP
key twice within half a second. The pump displays the manual
mode main screen.
Do not start the pump. Doing so erases the previously recorded master
dose and replaces it in the pump’s memory with the current, unmea-
sured dose.
Adjust the speed showing on the display using the
UP
or
DOWN
keys.
Press the
STOP
key twice within half a second to return to MemoDose. The dis-
play shows the previous percentage dose size. The pump will dose at the new
speed.
Note
: To retain the MemoDose value through a power interruption the pump must be
in auto-restart mode. The dosing cycle will resume at the start of a dose and wait for
START
to be pressed, with the MemoDose percentage screen displayed. See 16.6
Auto-restart.
To repeat the dose
The pump has recorded the
number of pumphead revolu-
tions required to dispense the
master dose. If the volume of
fluid in the measuring vessel
is the volume required, press
START
to repeat the dose.
If the volume of fluid in the
measuring vessel differs from
the volume required, the per-
centage may be adjusted
within the limits 1% to 999%
of the master dose. Use the
UP
or
DOWN
keys to alter
the percentage. Press
START
to dispense the new dose.
