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Watson-Marlow 620DuN and 620Du User Manual 28
17 Head and tubing calibration
The pump can display flowrate in a choice of units as well as speed in revolutions
per minute. It must first be calibrated.
Pump calibration can be limited to users who correctly enter a three-digit security
code. If a security code has been set, selecting Change from the calibration details
screen and confirming with the ENTER key causes the pump to display the Security
code entry sequence. See 18.22 Security code. If no security code has been set, the
pump displays the first screen of the calibration sequence.
To dispense the correct amount of fluid the pump must know which pumphead is fit-
ted and the tube size in the pumphead. The pump is pre-programmed with default
flow rate figures for a range of pumpheads and tubes. You may also measure the
flow from the pump and enter this value for the most accurate calibration.
Use the UP and DOWN keys to highlight Calibrate in the main menu. Press
ENTER to confirm.
Alternatively ...
Press CAL (SHIFT, 8) to enter the calibration screen from the main running
screen, and return there after calibrating.
Then:
The pump displays its current settings: pumphead, tube size and flowrate; the
default for each standard pumphead is the largest tube the pumphead can
take. Example information is shown here.
Use the UP and DOWN keys to highlight Accept or Change. Press ENTER to
confirm.
If Accept is selected, the default or previously set flowrate data for that pump-
head and tube size are used. The pump displays the main running screen.
If Change is selected with a security code in place, the pump starts its security
code entry sequence. See 18.22 Security code. When the correct code is
entered, the pump offers three options: Head and tube; Tube; and
Calibration dose. If Change is selected with no security code in place, the
three options are displayed immediately.
Use the UP and DOWN keys to make a selection. Press ENTER to confirm.
DuN, Du