VPAD Manual
28/47
Important:
Do not fasten the stop rings to the fastening ribs (12) too tightly. They are plastic pieces and they can be
damaged. Both stopper rings (upper and lower) look exactly the same and can be changed.
Place the Heldal motor (11) in the fastener (8) while pressing the displacement command (3).
Connect the upper stop ring to the fastener (8) and fasten it with the fastening rib (12).
Insert the viscometer by placing the fastening rib (15) in the Heldal bolt (4) and fasten it with the nut bolt
(14).
Balance the viscometer – Heldal set with the balancing knobs (10).
Fasten the T-shaped spindle (PA to PF samples) to the viscometer. In order to choose the right one, look at
the selection tables (T.3).
-
Screw the counterweight (6.4) in the lower part of the spindle receptor (6.3).
-
Insert the spindle receptor (6.5) between both upper and lower parts of the spindle receptor (6.2 and
6.3). Do not separate these two parts.
-
Fasten the spindle and screw in the lower part of the receptor (6.3) until it is completely fastened.
Important:
Do not fasten the spindle tighter than necessary. There should always be a small hole between both parts of
the receptor.
Fasten the spindle receptor and the spindle to the axis of the viscometer, by connecting the thread.
Place the sample container under the viscometer and insert the spindle into the sample fluid by pressing
the displacement button (3).
The stopper rings limit the vertical movement of the spindle. Therefore, these two rings must be fastened
correctly and in their correct positions.
Important:
Placement of stopper rings as explained here:
Upper ring: the spindle should be kept in the same fluid
Lower stopper ring: The spindle must not touch the bottom of the container. If so, the viscometer’s axe can
be damaged and the results can be wrong.
Once the rings are fastened, connect the viscometer and the Heldal to the power point. Switch the
viscometer on and insert the speed and the spindle, as always.
Set the Heldal unit on with the ON/OFF switch (7). Check if the pilot is on. If not, check the main
connection.
OPERATION:
The Heldal unit (which moves helicoidally) is moved up and down between the two stopper rings. When the
motor touches one of them, the unit changes direction.
The Heldal unit will keep moving, until turned with the ON/OFF switch (7).
