VEGA VEGAPULS 81 - Manual (Page 9)

VEGAPULS 64 and 81 9
Type code:
VEGAPULS 64 X X …
Type 64: V - Digital output signal
K - Analogue 0 … 20 mA output signal
Type 81: A - Digital output signal together with supply in EEx i
B - Digital output signal together with supply in EEx e
C - Digit. output signal in EEx e, sep. supply in EEx e
D - Anal. output signal in EEx e, sep. supply in EEx e
E - Anal. output signal in EEx i, sep. supply in EEx e
F - Horn antenna or pipe antenna
D - Rod antenna
Instrument series
Measuring principle (PULS for radar)
Types and versions
Classification
Classification EEx i intrinsically safe
With classification “i“ (intrinsically safe) electri-
cal circuits are produced which cannot ignite
an explosive mixture or explosive substance
neither during operation or in case of failure.
Hence it is ensured that the electrical energy
used (short-circuit) is lower than the ignition
energy required to ignite the substance.
In addition the capacitive and inductive en-
ergy storage is restricted such that they can-
not store sufficient energy to ignite an explo-
sive mixture.
With the classification “e“ (increased safety)
measures taken which avoid that a connected,
non-intrinsically safe circuit can ignite an ex-
plosive mixture or explosive substance.
Selected materials, increased contact and
track distances as well as lowest component
temperatures exclude sparks and heating.
Classification EEx d
With the classification “d“ (pressure tight en-
capsulation) instruments are constructed such
that even in case a mixture inside the instru-
ment ignites, no ignition energy escape to the
explosive atmosphere.
Classification EEx e increased safety