Siemens SITRANS L Operating Instructions Manual page 179

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