Stainless steel pycnometer Model 475

ISO 2811

The Density balls, Model 475, are a rapid method for determining the density of paints, coating materials and other non-pasty fluids.


Test Principle
A body immersed in a liquid is subject to an upward buoyant force. Knowing the volume of the body allows calculation of the liquid density.


Design and Function
The device consists of a spherical immersion body made of stainless steel (material no. 1.4305) and a holding rod with a neck section. The sphere can be fixed to a laboratory balance or to a table stand with swivel arm using an adjustable holding device.


Test Procedure and Evaluation
Fill a glass beaker with specimen material large enough to immerse the density ball to the middle of the holding-rod neck. Condition sphere and specimen to 20 ± 0.5 C. Weigh the beaker with the specimen (W1), immerse the sphere to the middle of the neck and repeat the weighing (W2). Calculate density using rh ((W2 - W1)/V) rhL.
W1: weight in g of beaker with specimen before immersion
W2: weight in g after immersing the sphere
V: volume in ml of the sphere up to the middle of the holding-rod neck (10 ml)
rhL: air density 0.0012 g/ml


Report the determined density with an accuracy of 0.001 g/ml and specify the reference temperature. Remove air bubbles from the liquid and from the sphere before measurement. The method is not suitable for rapidly sedimenting specimens; in such cases use a pycnometer (Model 290).


Important Notice
Due to the relatively high mass of the solid-turned sphere, hold the rod with the ball vertically to avoid undue stress on the neck section; do not shake off the liquid or load the ball laterally.


Reference Class
All versions of Model 475 are supplied with a Manufacturers Certificate M in accordance with DIN 55 350-18. The certificate includes, among others:
Test temperature
Ball volume
Product identification
Test equipment used with calibration status
Date
Name of inspector


Standards
DIN 53 217 Part 2
VDA 621-113
ISO 2811 Part 2


Characteristics / technical specifications:
Volume: 10 ml / 100 ml
Volume tolerance: ± 0.1 % (at 20 C)
Material: steel (stainless steel sphere, material no. 1.4305)
Recommended test temperature: measurement at 20 ± 0.5 C
Portable / Stationary: Stationary (fixing to laboratory balance or table stand)