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Technical specifications
11.3 Interface
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH
179
Minimum detectable distance 50 mm (2") from end of antenna - stainless horns,
PTFE flanged versions
6)
100 mm (4") from the end of the antenna - aluminum
horn, with polypropylene lens antenna and PVDF
versions
Update time
7)
minimum 1 second, depending on settings for Re-
sponse Rate (2.3.8.1.) and LCD Fast Mode (4.9.).
Influence of ambient temperature < 0.003% / K (average over full temperature range,
referenced to maximum range)
Long-term stability <0.1 % over 60 months
Dielectric constant of material measured dK > 1.6 [antenna and application dependent
8)
]
Memory non-volatile EEPROM
no battery required
1)
The statistical accuracy is typically 3 mm (0.12") 90% of the time, when tested in
accordance with IEC 60770-1.
2)
Under severe EMI/EMC environments per IEC 61326-1 or NAMUR NE21, the device error
may increase to a maximum of 10 mm (0.4").
3)
For 2" threaded PVDF antenna, Flanged encapsulated antennas and Hygienic encapsulated
antennas, the maximum measured error <500 mm from the sensor reference point =25 mm
(1").
4)
From sensor reference point: see Dimension drawings (Page 185) and Flanged Horn with
extension (Page 198).
5)
20 m (65.6 ft) possible in a stillpipe/bypass
6)
Minimum range is antenna 50 mm (2"). See Dimension drawings (Page 185).
7)
Reference conditions: Response Rate (2.4.1.) set to FAST, LCD Fast Mode (4.9.) set to
ON .
8)
For 1.5" (40 mm) antenna and 2" (50 mm) threaded PVDF antenna, 2"/DN50/50A flanged
encapsulated antenna and 2" ISO 2852, DN50 DIN 11864-1/2/3, DN50 DIN11851,
Tuchenhagen Types F and N hygienic encapsulated antenna the minimum dK is limited to 3
unless a stillpipe is used.
11.3 Interface
Communication: Foundation Fieldbus
ITK version 5
Blocks supported:
RESOURCE, LTB, AIFB1, AIFB2, LCD, DIAG
Block execution time:
AIFB - 40 ms
Configuration Remote FF host system or Emerson AMS (PC)
Local Siemens Milltronics infrared handheld programmer [see Programmer (infrared
keypad) (Page 183), or Field Communicator 375 (Page 253)]
Display (local)
1)
graphic LCD, with bar graph (representing level)
1)
Display quality will be degraded in temperatures below –25 °C (–13 °F) and above +65 °C (+149 °F).