User's Manual
Table Of Contents
- 8 Parameter reference
- 9 Service and maintenance
- 10 Diagnosing and troubleshooting
- 11 Technical data
- 12 Dimension drawings
- 12.1 Threaded horn antenna
- 12.2 Threaded horn antenna with extension
- 12.3 Flanged horn antenna
- 12.4 Flanged horn antenna with extension
- 12.5 Flanged encapsulated antenna (2"/DN50/50A sizes only)
- 12.6 Flanged encapsulated antenna (3"/DN80/80A sizes and larger)
- 12.7 Threaded PVDF antenna
- 12.8 Threaded connection markings
- 12.9 Raised-Face flange per EN 1092-1 for flanged horn antenna
- 12.10 Raised-Face flange per EN 1092-1 for flanged encapsulated antenna
- 12.11 Flat-Face flange
- 12.12 Process connection tag (pressure rated versions)
- A Appendix A: Technical reference
- B Appendix B: HART communications
- C Appendix C: Certificates and support
- 13 List of abbreviations
- 14 LCD menu structure
- Glossary
- Index
SITRANS LR250 (HART)
Operating Instructions, 01/2014, A5E32220602-AB
253
Glossary
accuracy
degree of conformity of a measure to a standard or a true value.
algorithm
a prescribed set of well-defined rules or processes for the solution of a problem in a finite
number of steps.
ambient temperature
the temperature of the surrounding air that comes in contact with the enclosure of the device.
antenna
an aerial which sends out and receives a signal in a specific direction. There are four basic types
of antenna in radar level measurement, horn, parabolic, rod, and waveguide.
attenuation
a term used to denote a decrease in signal magnitude in transmission from one point to another.
Attenuation may be expressed as a scalar ratio of the input magnitude to the output magnitude
or in decibels.
Auto False-Echo Suppression
a technique used to adjust the level of a TVT to avoid the reading of false echoes. (See TVT.)
Auto-False Echo Suppression Distance
defines the endpoint of the TVT distance. (See TVT.) This is used in conjunction with auto false
echo suppression.
beam spreading
the divergence of a beam as it travels through a medium.