M21-400 REV.1.1 DVPLUS DIGITAL VISCOMETER - OPERATIONAL MANUAL
To remove the spindle, the lower shaft should be secured and slightly lifted with one hand while unscrewing the
spindle to the right. Spindles can be identified by the number on the side of the spindle coupling nut.
If your instrument has the magnetic coupling system, the spindles are attached as follows:
Align two opposing spindle slots (Figure 2-5.2) with the two pins inside the coupling (Figure 2-5.3).
Figure 2-5.2 Figure 2-5.3
Carefully insert the spindle into the coupling, so the slots are fully engaged with the pins. You should feel the pull of
the magnet as the spindle seats into the coupling.
When properly aligned, there should be no gap between the spindle and the coupling. (Figures 2-5.4 and 2-5.5)
Figure 2-5.4 Figure 2-5.5
To remove the magnetic spindle :
• Carefully grasp the spindle shaft and gently lift it up just enough to minimize any pressure on the pivot point and
jewel inside the DVPlus.
• DO NOT PULL DOWN ON THE SPINDLE!!!!
• While lifting, gently push the spindle to the side like a pendulum to disengage it from the magnetic coupling. The
spindle and coupling should separate easily. If they do not separate easily, DO NOT FORCE IT! Stop and try
pushing in a dierent direction.
• Continue pushing the spindle in an unrestrictive direction until it is completely detached from the magnetic
coupling. (Figures 2-5.6 and 2-5.7)
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