Brochure/Catalogue
Glossary
Explosive atmospheres This is dened as a mixture of ammable materials and oxygen. An ignition
leads to a explosive burning process throughout the entire mixture. Usually the
oxygen is supplied by the surrounding air. Flammable materials may be gases,
liquids, vapours, mists or dusts. Explosion protection considers this to be normal
atmospheric conditions. The explosiveness of the mixture depends of the
ammability of the materials and the concentration of air or oxygen.
F
Flammability rating Flammability class specication according to the American UL 94 specication.
Duration of burning, annealing time and the burning drop formation are all taken
into account. The highest category is V-0.
Frequency converter Converts frequencies into analogue signals (or vice versa). In-line control systems
can then directly process pulse strings from speed or rotational measurements.
G
Galvanic isolation Potential-free isolation between electrical components.
Normally, the inputs circuit, output circuit and power supply are designed so
that they are electrically isolated from each other. The isolation can be achieved
using optical means (an optocoupler) or by using a transformer. The electrical
isolation of measurement signals ensures that the differences in earth potentials
and common-mode interference are suppressed
GOST-R The Russian certication for products, materials and technical facilities.
H
Hall sensor current measurement Hall sensors can measure the magnetic eld of a conducting wire. They then
generate a proportional voltage on the measurement output (the Hall voltage).
This can be converted to a standardised signal by means of an amplier circuit.
Such a measurement is well suited for measuring high DC and AC currents with
frequencies up to 1 kHz. Start-up currents and current peaks cannot damage a
Hall sensor.
W
Technical appendix/Glossary
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