Brookfield Falling Ball KF20 - Manual (Page 5)

Brookfield Engineering Labs., Inc. Page 5 Manual No. M09-352-B04
I.3 Details on Viscosity Measurement Range
Per DIN 53015, the Falling Ball method is suitable for measuring dynamic viscosities ranging
from 0.6 mPa•s to 250,000 mPa•s at temperatures from -60ºC to 150ºC. Use is made of six
balls having different diameters, each ball covering part of the range. All guideline values and
referenced parameters in the following table are per DIN 53015.
Ball
No.
Viscosity
measurement
range (guide-
line value)
(mPa•s)
Material
(Recom-
mendation)
Density
(guideline
value)
(g/cm 3)
Ball diameter
(mm)
Deviation
from
circularity
(mm)
Calibration
constant
(guideline value)
(mPa•s•cm 3 /g•s)
1 0.5 to 10 Borosilicate
glass
2.4 15.81 ± .01 ± 0.0005 0.007
2 9 to 140 Borosilicate
glass
2.4 15.6 ± 0.05 ± 0.0005 0.09
3 40 to 700 Ni/iron 8.1 15.6 ± 0.05 ± 0.001 0.09
4 150 to 5,000 Ni/iron 8.1 15.2 ± 0.1 ± 0.001 0.7
5 1,500 to 50,000 Ni/iron 8.1 14.0 ± 0.5 ± 0.001 7
6 Above 7,500 Ni/iron 8.1 11.0 ± 1 ± 0.002 35
I.4 Description of the Equipment
Refer to Figures 1 through 4. Specific items identified on the Falling Ball Viscometer are identified by
parentheses ( ) in the following steps:
1. The Falling Ball Viscometer must be level. The level is adjusted using the two Leveling
Screws (4) on the base. Adjust so that the bubble level on top of the Falling Ball Viscometer
is centered within the circle. Check level periodically during use.
2. a. The working angles of the KF20 are 80°, 70°, 60° and 50° relative to horizontal. The
DIN 53015 working position of 80° is the preferred position. The different working
angles are secured by a locking adjustment screw (5). To select a working angle, the
adjustment screw (5) should be loosened by turning it counter-clockwise approximately
one rotation. After the working angle is selected, the adjustment screw should then be
tightened again.
b. The working angle of the KF10 Viscometer is fixed at the DIN 53015 position of 80°
relative to horizontal.
3. The two running directions of the balls can be chosen by swivelling the viscometer, which
is mounted in the stand, and is secured by a locking mechanism (14).
4. The sample tube (6) is surrounded by a water jacket which is fixed between the upper plate
(7) and lower plate (8). The upper locking plug (16) with lid (20), the lower locking plug
(17) and accompanying seals (gaskets and washers) (19), and the caps (18) are designed to
perform the following functions within the sample tube:
a. keep the liquid sample tightly sealed