475 Density Sphere

ERICHSEN 475 Density Sphere (density tester), Germany

Product overview

The ERICHSEN 475 Density Sphere is a

sphere-type density tester consisting of a stainless steel sphere (10 or 100 ml at 20 °C) and a sturdy hanger. It measures the density of paints, coatings and other non-paste liquids quickly. It can be used with a standard stand or with a bench stand with a swivel arm (see right).

The 475 comes in four models:

Ø  475/I, volume 100 ml ± 0.1% (20 °C)

Ø  475/II, as 475/I, with official certificate issued by the weights and measures authority

Ø  475/III, volume 10 ml ± 0.1% (20 °C)

Ø  475/IV, as 475/III, with official certificate issued by the weights and measures authority

Tests can be carried out to these standards:

DIN 53 217, Part 2

ISO 2811, Part 2

VDA 621-113

Applications

The ERICHSEN 475 Density Sphere is mainly used to measure the density of paints, coatings and other non-paste liquids.

Test principle

A body immersed in a liquid experiences an upward force (buoyancy); from this force and the body's volume, the density of the liquid can be calculated. The density ρ of the sample at the standard test temperature t, in g/ml, is given by:

ρ = (W1 − W2)/V + ρL

W₁: weight of the beaker with sample before the sphere is immersed, g

W₂: weight shown on the balance after the sphere is immersed, g

V: volume of the sphere when immersed to the middle of the hanger neck, ml

ρL: density of air = 0.0012 g/ml

Test procedure

Fill a graduated glass beaker, large enough for the sphere to be immersed to the middle of the hanger neck, with the sample. Use a temperature-controlled cabinet or water bath to bring the sphere and sample to 20 ± 0.5 °C. Then place the beaker with the sample on a laboratory balance, and clamp the sphere's hanger to the stand so that the sphere can move up and down easily.

For the 475/I, the beaker and liquid must be weighed to ± 10 mg; for the 475/III to ± 1 mg. With the beaker and sample left on the balance, lower the sphere slowly into the liquid by hand until the hanger neck is immersed to its middle, and weigh again.

Technical data

Sizes: sphere volume 10 or 100 ml

Ordering guide

#290 Pycnometer (Chinese).pdf