Siemens SITRANS FM MAG 3100 Operating Instructions Manual page 88

Glossary
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.
PROFIBUS
PROFIBUS (Process Field Bus) is a vendor-independent, open bus system standardized in the
German DIN 19 245. It is a standard for field bus communication in automation technology and
should not be confused with the PROFINET standard for industrial Ethernet. PROFIBUS-PA
(Process Automation) is one of three PROFIBUS variants that are compatible with each other.
PROFIBUS-DP (Decentralized Periphery)
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.
USM
USM II is a Communication Platform. The Siemens USM II concept enables fitting of add-on bus
modules without loss of functionality:
1. All modules can be fitted as true "plug & play"
2. Module and transmitter are automatically configured through the SENSORPROM
88
SITRANS FM MAG 3100
Operating Instructions, 12/2021, A5E03005599-AE