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I.3 details on viscosity measurement range, I.4 description of the equipment – Brookfield Falling Ball KF40 User Manual

Page 7

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Brookfield Engineering Labs., Inc.

Page 7

Manual No. M11-353-A0512

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 and 2. 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 three Leveling

Feet (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 KF40 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 the adjustment screw (5). To select a working angle, the adjust-

ment 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 KF30 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 swiveling the viscometer, which

is kept in place by the Stop to hold the viscometer in position (22).

4. The glass tube (6) is surrounded by a waterbath jacket (9) 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 (19), and the caps (18) are designed to perform the fol-

lowing functions within the sample tube:

This manual is related to the following products: