Siemens 7ML5431 Operating Instructions Manual page 176

Technical data
11.2 Performance
Measurement Accuracy (measured in accordance with IEC 60770-1)
Maximum measured error
Frequency
Maximum measurement range
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, 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 Dimensions (Page 183).
4)
20 m (65.6 ft) possible in a stillpipe/bypass
5)
Minimum range is antenna length + 50 mm (2"). See Dimension drawings (Page 183).
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, 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.
See Stainless steel flanged horn antenna (Page 194).
See PTFE Flanged encapsulated antenna (3"/DN80/80A sizes and larger) (Page 200).
176
4)
7)
= 3 mm (0.12") including hysteresis and non-
1) 2) 3)
repeatability
K-band
1.5" antenna
2" threaded PVDF antenna
2"/DN50/50A Flanged encapsulated
antenna (FEA)
2" ISO 2852, DN50 DIN 11864-
1/2/3, DN50 DIN11851, Tuchenha-
gen Types F and N Hygienic encap-
sulated antenna (HEA)
all other versions
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 version and
PVDF versions
minimum 1 second, depending on settings for Re-
sponse Rate (2.4.1.) 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
Operating Instructions, 10/2019, A5E32220602-AG
10 m (32.8 ft)
20 m (65.6 ft)
]
8)
SITRANS LR250 with mA/HART
5)