Siemens SITRANS LR140, Operating Instructions Manual

Page: 53 / 58

Technical data and dimensions
12.1 Technical data
Max. measuring range
a
8 m (26.25 ft)
a
Depending on application and medium
Switch-on phase
Start-up time with operating
voltage U
B
< 1 5 s
Starting current (for run-up
time)
≤ 3.6 mA
Output variable
Output signal 4 … 20 mA
Range of the output signal 3.8 … 20.5 mA (default setting)
Signal resolution 0.3 µA
Resolution, digital 1 mm (0.039 in)
Fault signal, current output
(adjustable)
≤ 3.6 mA, ≥ 21 mA, last valid measured value
Max. output current 22 mA
Load See load resistance under Power supply
Starting current
• Load
≤ 3.6 mA; ≤ 10 mA for 5 ms after switching on
600 Ohm at 24 V DC
Damping (63 % of the input
variable), adjustable
0 … 999 s
Deviation (according to DIN EN 60770-1)
Process reference conditions according to DIN EN 61298-1
Temperature +18 … +30 °C (+64 … +86 °F)
Relative humidity 45 … 75 %
Air pressure 860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Installation reference conditions
Distance to installations > 200 mm (7.874 in)
Reflector Flat plate reflector
False reflections Biggest false signal, 20 dB smaller than the useful signal
Deviation with liquids
Measuring distance
> 0.25 m/0.8202 ft
≤ 5 mm
Measuring distance
≤ 0.25 m/0.8202 ft
≤ 10 mm
Non-repeatability
a
≤ 5 mm
Deviation with bulk solids The values depend to a great extent on the application. Binding
specifications are thus not possible.
a
Already included in the meas. deviation
46
SITRANS LR140
Operating Instructions, 08/2020, A5E50352144