Siemens SITRANS T Series Operating Instructions Manual page 44

Glossary
Optical power (dBm)
Optical power is the derivative of radiant energy with respect to time. Optical power is
indicated in dBm.
Peak
See FBG peak.
Pigtail
Glass fiber cable and plug
Process Device Manager
PDM is a Siemens software package for configuration, parameter assignment,
commissioning and maintenance of network configurations and field devices. Part of
SIMATIC STEP 7. Used for configuration and diagnostics.
Sensor
A sensor is a measuring point. Each measuring point is an FBG in the glass fiber.
Transition
Transition between glass fiber with sensors and stainless steel jacket with pigtail.
Wavelength (nm)
Distance in the direction of propagation of a periodic wave between two successive points at
which the phase is the same (IEV 845-01-14)
Wavelength is indicated in nm.
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Operating Instructions, 04/2017, A5E39322264-AC
SITRANS TO500