Lorenz Messgerätebau

Lorenz company profile


Products :

Aerosol measuring technology

Aerosol generation

Filter testing

Smoke alarm testing

Bulk material assessment

Ringer Bath Handler

Bundesstrasse 116 - 37191 Katlenburg-Lindau - +49(0)5556/1093

deutsche Version
Smoke alarm testing  

<General infomation>
<SP3 automatic sedimentation dust measuring instrument>
<CDD Counterflow sedimentation tube>

Detailed information you will find in our Info-Prospect
(pdf-Document, ca. 209 KByte)

General Information

Our measuring instruments are all based on one common concept: They simulate the technical handling of bulk material samples in a standardised manner and simultaneously measure the concentration of airborne materials that are released.

Two different simulation processes are available:

  1. The “Sedimentation Method" (DIN 55992-2)
    A feeding system instantaneously releases a sample of the substance into a sedimentation tube. The airborne materials that are released during the fall and on impact begin to sediment. The measuring instrument records the
    sedimentation process.
  2. The "Continuous Drop Down" method (DIN 33897-2)
    The material to be tested is fed into a sedimentation tube with counterflow as a continuous mass stream. The proportions of respirable E-dust and A-dust, which can enter the alveoli, from the resulting airborne materials are gravimetrically determined by means of partial flow extraction.
The advantage of these two methods lies in the fact that when assessing the dusting propensity they only draw on the fine dust proportion that is freely mobile in the bulk material samples.
From processing technology and occupational hygiene viewpoints only this proportion is relevant.
Agglomerated fine dust and fine dust that is bonded to coarse-grained substance components through adhesive force is left in its natural state during the measurement. It has practically no influence on the dusting behaviour of the bulk material.

SP3 automatic sedimentation dust measuring instrument

The SP3 simulates the formation of dust that arises during processes such as packing, metering or filling substances using the sedimentation method (DIN 55992- 2):

  • The sample of bulk material to be examined falls through the sedimentation tube of the SP3. While it is falling in the enclosed tube the sample releases its unbonded, airborne fine dust into the air. This is followed by sedimentation.
  • At the bottom of the sedimentation tube is a laser-optical sensor system with which the instrument’s process computer records the sedimentation process and stores this information for the subsequent evaluation.
  • Measuring, evaluation and cleaning take place fully automatically in just 60 seconds.
  • Applications: Anywhere where large quantities of samples occur, for example in the areas of process technology, production control, quality assurance, occupational hygiene.
top sedimentation dust measuring instrument SP3 automatic</I>
SP3 automatic sedimentation dust measuring instrument


CDD Counterflow sedimentation tube

With our counterflow sedimentation tube CDD we offer a dust measurement instrument that uses the Continuous Drop Down method according to DIN 33897-2.

The CDD was developed in the Institute for Dangerous Substance Research of the Mining Occupational Accident Insurance Fund with respect to TRGS 900 (German technical guidelines governing the list of maximum concentrations at the workplace).
A metering device discharges the bulk material sample via a sedimentation tube into a tube with counterflowing air. At the same time, above the dust discharge point, A-dust, which can enter the alveoli, and respirable E-dust are separated on to filters by simultaneous partial flow extraction and then gravimetrically determined.

top CDD Counterflow sedimentation tube
CDD Counterflow sedimentation tube