Watson & Sons 520DUN user manual Calibrate

17 Calibrate

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 16 PIN-secure process protection. 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.

￿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 in flowrate calculations. The pump redisplays the main menu.

￿If Change is selected with a security code in place, the pump starts its security code entry sequence. See 16 Security code entry. 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.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 31