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Watson-Marlow 620DuN and 620Du User Manual 53
To repeat the dose
The pump has recorded the number of pumphead revolutions required to dis-
pense 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 percentage 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 dis-
pense the new dose.
The display counts down as the dose proceeds and stops when the dose is
complete.
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
return to manual operation.
20.1 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
18.12 Auto-restart.