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Glossary
Fraction
Fraction designates a proportional relation between an object part and the object whole. For
example, the fraction 3⁄4 represents three equal parts of a whole object, divided into four
equal parts.
HART
HART Communication is a bi-directional industrial field communication protocol used to
communicate between intelligent field instruments and host systems. HART is the global
standard for smart process instrumentation and the majority of smart field devices installed in
plants worldwide are HART-enabled. HART technology is easy to use and very reliable
IP
An IP (Ingress Protection) number is used to specify the environmental protection of
enclosures around electronic equipment. These ratings are determined by specific tests. The
IP number is composed of two numbers, the first referring to the protection against solid
objects and the second against liquids. The higher the number, the better the protection. For
example, in IP67 the first Number (6) means that the device is totally protected against dust,
and the second (7) that it is protected against the effect of immersion between 15cm and 1m
MODBUS
MODBUS is a serial communications protocol intended for use with programmable logic
controllers (PLCs). MODBUS allows for communication between many devices connected to
the same network, for example a system that measures temperature and humidity and
communicates the results to a computer. MODBUS is often used to connect a supervisory
computer with a remote terminal unit (RTU) in supervisory control and data acquisition
systems.
NAMUR
Normenarbeitsgemeinschaft für Meß- und Regeltechnik in der Chemischen Industrie
(NAMUR). NAMUR is a group representing the interests of the chemical industry which
create standards for instrumentation and electrical devices used in industrial plants.
PED
The Pressure Equipment Directive (97/23/EC) is the legislative framework on European level
for equipment subject to a pressure hazard. It was adopted by the European Parliament and
the European Council in May 1997 and has been obligatory throughout the European Union
since May 2002.
Plato
Plato is a measure of the weight of the solids dissolved in water. It is expressed in %.
54
Operating Instructions, 10/2009, A5E02154544-02
SITRANS F C MC2
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