Siemens SITRANS LG260 Operating Instructions Manual page 72

Deviation on the current output through analogue/digital conversion
Ʋ Non-Ex and Ex-ia version
Ʋ Ex-d-ia version
Additional deviation through electromag-
netic interference acc. to EN 61326
Influence of the superimposed gas and pressure to the accuracy
The propagation speed of the radar impulses in gas or vapour above the medium is reduced by
high pressure. This effect depends on the superimposed gas or vapours.
The following table shows the resulting deviation for some typical gases and vapours. The specified
values refer to the distance. Positive values mean that the measured distance is too large, negative
values that the measured distance is too small.
Gas phase
Air
Hydrogen
Steam (saturated
steam)
Characteristics and performance data
Measuring cycle time
Step response time
8)
Max. filling/emptying speed
Ambient conditions
Ambient, storage and transport tempera-
ture
Process conditions
For the process conditions, please also note the specifications on the type label. The lowest value
always applies.
The measurement error through the process conditions in the specified pressure and temperature
range is < 1 %.
Time span after a sudden measuring distance change by max. 0.5 m in liquid applications, max 2 m with bulk
8)
solids applications, until the output signal has taken for the first time 90 % of the final value (IEC 61298-2).
72
Temperature
1 bar (14.5 psig)
20 °C (68 °F) 0 %
200 °C (392 °F) -0.01 %
400 °C (752 °F) -0.02 %
20 °C (68 °F) -0.01 %
200 °C (392 °F) -0.02 %
400 °C (752 °F) -0.02 %
100 °C (212 °F) 0.26 %
180 °C (356 °F) 0.17 %
264 °C (507 °F) 0.12 %
366 °C (691 °F) 0.07 %
SITRANS LG260 - Operating Instructions
< ±15 µA
< ±40 µA
< ±150 µA
10 bar (145 psig)
0.22 %
0.13 %
0.08 %
0.1 %
0.05 %
0.03 %
-
2.1 %
1.44 %
1.01 %
< 500 ms
≤ 3 s
1 m/min
Products with high dielectric constant (>10) up to 5 m/
min.
-40 ... +80 °C (-40 ... +176 °F)
Pressure
50 bar (725 psig)
1.2 %
0.74 %
0.52 %
0.61 %
0.37 %
0.25 %
-
-
9.2 %
5.7 %
PBD-51041057