Glossary
SITRANS FCS200
40 Operating Instructions, 02/2011, A5E02508199-01
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
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.
SENSORPROM
All sensor related settings/data saved on an EPROM. SENSORPROM technology
automatically configures the transmitter at start up providing calibration data, pipe size,
sensor type, and output settings. The SENSORPROM automatically stores values or
settings changed by users, and automatically re-programs any new transmitter without loss
of accuracy.
Turndown ratio
'Turndown ratio' is a flow measurement term indicating the range a specific flow meter, or
meter type, is able to measure with acceptable accuracy. It is also known as rangeability. If a
gas flow to be measured is expected to vary between 100,000 m³ per day and 1,000,000 m³
per day, the specific application has a turndown ratio of at 10:1. Therefore the meter requires
a turndown ratio of at least 10:1.
Zero point adjustment
In order to measure accurately with a measuring instrument it is important that zero and gain
have been calibrated. All Coriolis sensors are calibrated before they are sent out to
customers. However, Coriolis sensors are very sensitive, and several factors might move the
zero point, e.g installation, pressure, temperature and even very small vibrations coming
from the process. All these factors are customer specific and can’t be simulated at the
factory. Therefore Siemens recommends to carry out a zero point adjustment before use.
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