Brookfield Dial Stepper Viscometer - Manual (Page 11)

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Brookfield Engineering Laboratories, Inc. Page 11 Manual No. M00-151-H0612
II.2 Using the Viscometer for Measurements
1. Mount the guard leg (if used) on the Viscometer.
.
2. 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.
3. 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.
4. 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).
5. Lower the Viscometer and center the spindle in the test material until the meniscus is in the
middle of the immersion mark.
II.3 Taking Readings and Calculating Viscosity
1. Select the desired speed.
2. Turn the Viscometer motor switch to the ON position.
3. 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.
4. 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 "Off" 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.
5. Record the reading indicated by the red pointer on the dial: this number is known as % torque.
To convert the % torque reading to viscosity in centipoise (cP), multiply the dial reading by the
appropriate factor for the spindle and speed in use.
Dial reading x Factor = Viscosity in cP (mPa•s)
Example: LVT Viscometer with #61 spindle at 6 rpm
Dial Reading: 75 Factor: 10
75 x 10 = 750 cP (mPa•s)
Full scale viscosity range for any speed and spindle combination is equal to the factor x 100.
Factor x 100 = Full scale range
Example: LVT Viscometer with #61 spindle at 6 RPM
Full Scale Range: 10 x 100 = 1,000 cP