Watson-Marlow 620U - Manual (Page 53)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 53
When a volume of fluid has been dispensed, it is necessary to stop the pump
and display the Calibration dose screen. This can be achieved in several ways.
1 Press the STOP key twice within half a second. The pump stops and imme-
diately displays the MemoDose/Calibration screen. Use the UP or DOWN
keys to select Calibration dose. Press ENTER to confirm.
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 suffi-
ciently precise.) Then press the STOP key twice within half a second. The
pump displays the MemoDose/Calibration screen. Use the UP or DOWN
keys to select Calibration dose. Press ENTER to confirm.
OR... 3 620UN, 620U 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 620SN, 620S Press the MemoDose key. The pump displays the
MemoDose/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
number 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 revolu-
tion. 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.
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.