The reference fluid viscosity at -30F is 28,580. Reference fluid viscosity at -20F is 11,360. The observed dial reading for the test fluid at 12 rev/m is 49.5. It is then cooled to the test temperature for 16 hours, after which the spindle is rotated to determine the low temperature viscosity.įor example, we'll set a fluid to a temperature of -30F or -34.4C. The fluid to be tested is placed in a test cell tube of 22mm ID by 115mm long. The Brookfield machine is calibrated with a calibration fluid of known viscosity. The spindle speed can be varied from 120.0 to 0.6 rev. The Brookfield viscosity is measured for a viscosity range from 250 to 1,000,000 mPa.s (cP). Recall that ATF is simply a specialized hydraulic fluid, as is Power Steering System fluid. If you look at ATF specifications you will see a Brookfield viscosity value listed. Measurement of the viscometrc properties of these oils and fluids is often used to specify their acceptance for service. The Low temperature, low shear rate viscosity of automatic transmission fluids, gear oils, torque, and tractor fluids and industrial and automotive hydraulic oils are of considerable importance.
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