Watson-Marlow PF22 - Manual (Page 27)

Operators Manual
PF22
PF22 OM EN 74-132-005 v1.02.doc Version: 1.02 Page 27 of 34
7.2 Initial volume calibration
If a volume has been entered in function 1, and a completed fill is measured with a balance, the
specific gravity of the liquid in question is to be entered in function 9.
(The parameters already entered may be used for a trial).
Prepare the balance by tarring the container 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 tarred container below the filling needle and complete a single fill by pressing
<calib>+<GO> and PF22 will now ask for the completed volume showing the following display:
CALIB. WEIGHT: 0.0000_
F 1: VOLUME (ml): 8.50
In the prompt line, PF22 asks the weight, and the WEIGHT of the trial fill in question must be
entered, for example. 8.12: <8>+<.>+<1>+<2>+<ENT>
After calibration, complete a few fills and draw off a sample and check the volume.
If the volume is not at the level desired, carry out a re-calibration as described below.
Function 8 should now be reset, and the filling may be started by pressing <disp.>+<GO>.
7.3 Re-calibration
During production it may be necessary to recalibrate the volume dispensed by the filler to
compensate for changes in the environment e.g. the liquid level of the feed vessel will sink. This
re-calibration may be carried out without stopping the filling.
IT IS IMPORTANT TO USE THE SAME MEASURING METHOD FOR THE RECALIBRATION AS
USED FOR THE INITIAL CALIBRATION.
Draw off a filled sample and measure it. If the volume is not at the level desired, press <calib> +
<Ent> and then insert the measured value. Subsequently, let the production continue and draw off
a sample to check the volume again.
PF22 will now automatically adjust the subsequent fills.