User's Manual

Technical data
11.2 Performance
SITRANS LR250 (PROFIBUS PA)
170 Operating Instructions, 01/2014, A5E32221386-AB
11.2
Performance
Reference operating conditions according to IEC 60770-1
Ambient temperature
15 to 25 °C (59 to 77 °F)
Humidity
45 to 75% relative humidity
Ambient pressure
860 to 1060 mbar a (86000 to 106000 N/m
2
a)
Measurement Accuracy (measured in accordance with IEC 60770-1)
Maximum measured error
=3 mm (0.12")
1) 2) 3)
including hysteresis and non-
repeatability
Frequency
K-band
Maximum measurement range
4)
1.5" antenna, and 2" threaded PVDF
antenna, and 2"/DN50/50A Flanged
encapsulated antenna (FEA)
10 m (32.8 ft)
all other versions
20 m (65.6 ft)
Minimum detectable distance
50 mm (2") from end of antenna
5)
Update time
7)
minimum 1 second, depending on settings for
Response 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)
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 and Flanged 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 177) and Flanged Horn with
extension (Page 184).
5)
20 m (65.6 ft) possible in a stillpipe/bypass
6)
Minimum range is antenna length + 50 mm (2"). See Dimension drawings (Page 177).
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, and 2"/DN50/50A flanged
encapsulated antenna, the dK is limited to 3 unless a stillpipe is used.