User's Manual

Glossary

SITRANS F C MASS 2100 Di 3-40

Operating Instructions, 07/2010, SFIDK.PS.028.Z1.02

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 specific 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

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.