Watson-Marlow 720UN and 720SN User Manual
51
UN, SN
17 MemoDose and calibration
Note
: This menu area also gives access to flow rate calibration.
Each time the pump is started by pressing
START
, it records the number of pump-
head revolutions which occur until
STOP
is pressed. The number of revolutions is
proportional to the volume of fluid which has been dispensed: the dose. The Memo-
Dose facility allows the user to repeat-dose a precise volume of fluid. To do so, a
quantity of fluid must be dispensed as the master dose which the MemoDose facility
can repeat exactly or proportionately.
To dispense a master dose
In the manual mode main screen, set the appropriate pump speed and direction
using the
UP
or
DOWN
keys and the
DIRECTION
key. An example is shown
here. A slower speed may make it easier for the user to measure accurately -
though it may not represent the duty condition.
Place a suitable measuring vessel under the pump delivery tube.
Press
START
. The pump runs and fluid is pumped into the vessel.
When the required volume of fluid has been dispensed, it is necessary to stop
the pump and display the MemoDose screen. This can be achieved in several
ways.
1 Press the
STOP
key twice within half a second. The pump stops and im-
mediately displays the MemoDose screen.
OR... 2 Press the
STOP
key once. The pump stops. (This may make it easier 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 displays the
MemoDose screen.
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 screen.
OR... 4 , 720SN Press the
MemoDose
key
