Watson-Marlow DF32 - Manual (Page 22)

Operator’s manual
DF32
Rev.: 1.03 Date: 2007-03-12 Page 22 of 32
File:
DF32 OM 1.03 EN
8 Calibration
As the surroundings of the DF32 may vary from time to time and as pump head and products have
small tolerances, it is necessary to calibrate the filler when it is started.
If the quantity has been entered as volume in ml, a measuring cylinder or a balance may be used as a
control and measuring unit. The balance will always be the more accurate, especially for small
quantities.
The calibration in DF32 is made as following.
This re-calibration can be carried out simultaneously with the fills.
! The DF32 should always be re-calibrated after changing any of the pump parameters:
That is: Volume, Velocity, Acceleration or Reversing!
8.1 Volume calibration with measuring cylinder
IF A VOLUME HAS BEEN ENTERED IN FUNCTION 1, AND A COMPLETED FILL IS MEASURED
IN A MEASURING CYLINDER,
THE SPECIFIC GRAVITY IN FUNCTION 9 MUST ALWAYS BE SET AT THE VALUE 1.0.
The parameters already entered may be used for a trial.
Prepare the measuring cylinder and make sure that the tubes are completely filled, up to and
including the filling needle.
It is recommended to let the filler complete a few fills before the calibration is carried out.
Keep the measuring cylinder below the filling needle and press <calib>+<GO> to complete a single fill
and DF32 will now ask the dispensed volume showing the following display:
CALIB. WEIGHT: 0.0000_
F 1: VOLUME (ml): 50.0
Fig. 8.1
In the prompt line, DF32 prompts for the weight. THE WEIGHT MUST BE ENTERED, i.e. 48.5:
<4>+<8>+<.>+<5>+<ENT>.
DF32 has now automatically adjusted from 48.5 ml to 50.0 ml.
Function 8 should now be reset, and the filling may be started by pressing <disp.>+<GO>.