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• LV viscometers use a set of four spindles and a narrow guard leg; RV viscometers use a set of six spindles
and a wider guard leg; HA and HB Viscometers use a set of six spindles and no guard leg
• Speeds (rpm) are changed by turning the black knob on the top of the viscometer (to the left or right) to the
desired speed.
• The clutch lever, when depressed, raises the dial against the red pointer and "holds" the viscometer reading.
Releasing the clutch lowers the dial and frees the pointer.
• Mount the guard leg (if used) on the viscometer.
• With no spindle attached, lower the viscometer by turning the black knob on the right side of the clamp.
Center the viscometer over the test material.
• Take care to avoid trapping air bubbles under the spindles, especially the disk-type. Begin by immersing the
spindle on a diagonal path across the surface of the fluid. Slowly drag the spindle across the fluid surface
and then bring the spindle to the upright position. Thread the spindle onto the viscometer.
• Attaching the spindle correctly is important. Gently push up on the viscometer coupling screw, avoiding any
side-to-side movements. Hold it securely while screwing the spindle on (Note: left hand thread).
• Lower the viscometer and center the spindle in the test material until the meniscus is in the middle of the
immersion mark.
Using the Viscometer for Measurements
• Select the desired speed.
• Turn the Viscometer motor switch to the ON position.
• Allow time for the indicated reading to stabilize; this time
may vary, depending on your fluid, or your test method.
A minimum of 5 revolutions is recommended before
taking any reading.
• To take a reading, depress the clutch lever and hold it in the
down position. With the lever still depressed, move the motor
switch to the "Pause" or "O" position. Adjust the dial
position, if necessary, to allow the red pointer to appear in
the viscometer window.
▪ Depressing the clutch lever locks the calibrated spring
deflection in place, thereby providing the dial reading;
holding the motor switch in the "Pause" position (or
moving it to the "OFF" position) stops the motor and
causes the dial to stop turning so you can record
the reading.
• Record the reading indicated by the red pointer on the dial:
this number is known as % torque. Consult the manual for
information on how to convert the % torque reading to
viscosity in centipoise (cP).
• Switch the motor to the OFF position when changing
spindles and samples.
• Remove the spindle before cleaning.
Taking Readings and Calculating Viscosity
QS-Dial Rev. 2.0
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