Brookfield BF35 - Manual (Page 16)

Brookfield Engineering Labs., Inc. Page 16 Manual No. M13-10000
setting until the thermometer reading becomes stable to within ± 0.2˚F
(0.1˚C) per seconds. Note and record the temperature reading.
6. Once the temperature has stabilized, operate the viscometer at 600 RPM
and then at 300 RPM. Note and record the dial readings to the nearest 0.5
dial unit.
7.
Using the temperature-viscosity chart supplied with the calibration fluid,
determine the certified viscosity to the nearest 0.5 centipoise.
a. Compare at 300 RPM reading to standard viscosity and record the
deviation plus or minus.
b. Divide the 600 RPM dial reading by 1.98, compare that to standard
viscosity, and record the deviation plus or minus.
8. Deviations exceeding 1.5 dial units are not acceptable. If the deviation
exceeds this tolerance, the viscometer will require adjustments or calibration
by a qualified technician.
9. Record the viscometer serial number, date, and deviation. Mark on the
viscometer the date of calibration and a general indication of the calibration
check status.