Brookfield BF35 - Manual (Page 7)

Brookfield Engineering Labs., Inc. Page 7 Manual No. M13-10000
Section 1 - Introduction
Introduction
The BF35 Viscometer is extensively used worldwide in both the field and
laboratory for the precise measurement of rheological properties of fluids.
Description
The BF35 Viscometer determines the flow characteristics of oils and drilling fluids
in terms of shear rate and shear stress over various time and temperature ranges
at atmospheric pressure. Speeds are easily changed with a control knob, and
shear stress values are displayed on a lighted magnified dial for ease of reading.
The viscometer’s motor RPM is continuously monitored and automatically
adjusted by the Brookfield Pulse-Power electronic speed regulator to maintain a
constant shear rate under varying input power and drilling fluid shear conditions.
The eight precisely regulated test speeds (shear rates in RPM) are as follows: 3
(Gel), 6, 30, 60, 100, 200, 300, and 600. A higher stirring speed is also provided.
Speeds may be changed with a control knob selection, without stopping the motor.
The BF35 is suitable for both field and laboratory use and uses a motor-driven
electronic package to provide drilling fluid engineers with an extremely accurate
and versatile tool. The BF35 operates from a 13 - 16 VDC power source. The
electronic regulator continuously monitors and automatically adjusts the rotational
speed to maintain a constant shear rate under varying fluid shear conditions and
input power variations that are commonly found on-site.