Watson-Marlow 720UN and 720SN User Manual
54
OR... 2
Press the
STOP
key once. The pump stops. (This may make it eas-
ier to ensure that the quantity of fluid that has been dispensed is sufficiently
precise.) Then press the
STOP
key twice within half a second. The pump dis-
plays the MemoDose/Calibration screen. Use the
UP
or
DOWN
keys to select
Calibration dose
. Press
ENTER
to confirm.
OR... 3
720UN
Press the
STOP
key. The pump stops. Press the
MENU
key.
Use the UP or
DOWN
keys to select
MemoDose
. Press
ENTER
to confirm.
The pump displays the MemoDose/Calibration screen. Use the
UP
or
DOWN
keys to select
Calibration dose
. Press
ENTER
to confirm.
OR... 4
720SN
Press the
MemoDose
key. The pump displays the MemoD-
ose/Calibration screen. Use the
UP
or
DOWN
keys to select
Calibration
dose
. Press
ENTER
to confirm.
Measure the volume of fluid pumped. Make a note of the volume.
The pump has recorded the number of pumphead revolutions required to pump
the volume of fluid measured.
The calibration dose screen is displayed. It shows a four-digit number of millil-
itres, and the instruction: "Enter dose value". The number displayed is the num-
ber which was entered the previous time the pump was calibrated (or the
default figure).
Use the
UP
and
DOWN
keys to enter the measured volume of fluid pumped.
Press
ENTER
to confirm.
The pump calculates the volume of fluid pumped for each pumphead revolution.
The value from this calculation is saved for use in manual mode displays.
The pump displays a confirmation screen for four seconds, and returns the user
to the manual mode main screen, with millilitres per minute shown.
The pump can now display millilitres per minute, revolutions per minute, or
both. Press the
START
key while the pump is running to cycle though the three
display options. Example values are shown here.
Note
: Always recalibrate after changing pump tubes, fluid, or any connecting
pipework. It is also recommended that the pump is recalibrated periodically to main-
tain accuracy.
17.4 Exit
To return to the manual mode main screen select
Exit
using the
UP
and
DOWN
keys.
Confirm by pressing
STOP
.
18 Exit
Press
Exit
in the Main menu to return to the Manual mode main screen.
UN, SN
