BARTEC BENKE CFPP-4.2, Operating Instructions Manual

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12 Safety
CFPP Process Analyzer CFPP-4.2 03/2016
2.4.2 Types of Protection and certificates
The analyzer and its components conform to different types of protection which are
defined as follows:
Pressurized enclosure „p“
The surrounding potentially explosive atmosphere is prevented from entering the
measuring unit enclosure by means of an ignition shield gas (in this case: air) which is
held inside the enclosure and kept at a higher pressure than the surrounding atmospheric
pressure.
Flameproof enclosure “d”
Type of protection where components which could ignite an explosive atmosphere are
built into an enclosure. The enclosure is designed to withstand the pressure of an
explosion inside the enclosure and to prevent the transmission of the explosion to the
explosive atmosphere surrounding the enclosure.
Increased safety “e”
An increased safety level is achieved by additional measures. This eliminates the risk of
incorrectly high temperatures and the risk of sparks or electric arcs inside and on the
surface of electrical components which do not constitute an ignition source during normal
operation.
Encapsulation “m”
Components which could ignite an explosive atmosphere by sparks or heat are potted so
as to prevent ignition of the explosive atmosphere. This is achieved by encapsulating the
components in a compound resistant to physical and chemical influences.
Intrinsic safety “i”
Intrinsically safe circuits are circuits in which no spark or thermic effect can ignite an
explosive atmosphere of the subgroups IIA, IIB or IIC.