Siemens SITRANS LG240 Operating Instructions Manual page 67

Specifications apply also to the current output
Temperature drift - Current output
Deviation in the current output due to digital/analogue 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 on measurement 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 Temperature
Air 20 °C (68 °F)
200 °C (392 °F)
400 °C (752 °F)
Hydrogen 20 °C (68 °F)
200 °C (392 °F)
400 °C (752 °F)
Steam (saturated 100 °C (212 °F)
steam)
180 °C (356 °F)
264 °C (507 °F)
366 °C (691 °F)
Characteristics and performance data
Measuring cycle time
Step response time
8)
Max. filling/emptying speed
Ambient conditions
Ambient, storage and transport temperature
Ʋ Standard
Ʋ CSA, Ordinary Location
Also for the additional current output (optional).
7)
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).
PBD-51041037
±0.03 %/10 K relating to the 16 mA span or max. ±0.3 %
< ±15 µA
< ±40 µA
< ±150 µA
1 bar (14.5 psig)
0 %
-0.01 %
-0.02 %
-0.01 %
-0.02 %
-0.02 %
0.26 %
0.17 %
0.12 %
0.07 %
< 500 ms
≤ 3 s
1 m/min
Products with high dielectric constant (>10) up to 5 m/
min.
-40 ... +80 °C (-40 ... +176 °F)
-40 ... +60 °C (-40 ... +140 °F)
SITRANS LG240 - Operating Instructions
7)
Pressure
10 bar (145 psig)
0.22 %
0.13 %
0.08 %
0.1 %
0.05 %
0.03 %
-
2.1 %
1.44 %
1.01 %
50 bar (725 psig)
1.2 %
0.74 %
0.52 %
0.61 %
0.37 %
0.25 %
-
-
9.2 %
5.7 %
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