Watson-Marlow 620U - Manual (Page 51)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 51
To repeat the 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.
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.
The pump has recorded the
number of pumphead revolu-
tions required to dispense
the master dose. If the vol-
ume 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.