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
Appendix A: Technical reference
A.6 Loop power
SITRANS LR250 (HART)
Operating Instructions, 01/2014, A5E32220602-AB
237
A.6.1
Allowable operating area of SITRANS LR250
Note
The curves below apply to a standalone device, configured via the Siemens handheld
programmer.
A.6.2
Curve 1 (General Purpose, Intrinsically Safe, Non-Sparking, Non-incendive)
Loop Voltage versus Loop Resistance
Note
Whe
n using HART communications, the minimum voltage with 220 Ohms (RL) is 16.3 V DC.