D
R
A
F
T
Micropilot FMR53, FMR54
Hauser
V. 1, Rev. 7, 26-10-2012
31
Gas layer
Temperature
Pressure
°C
°F
1 bar (14,5 psi)
10 bar (145 psi)
50 bar (725 psi)
100 bar (1450 psi)
160 bar (2320 psi)
Water
(saturated
steam)
100
212
0.02 %
-
-
-
-
180
356
-
2.1 %
-
-
-
263
505,4
-
-
8.6 %
-
-
310
590
-
-
-
22 %
-
364
687
-
-
-
-
41.8 %
When the pressure is known and constant, this measured error can, for example, be compensated by
means of a linearization.
Gas phase compensation with
external pressure sensor
(PROFIBUS PA, in
preparation)
PROFIBUS devices can receive the signal of an external pressure sensor through the bus and use it to
perform a pressure dependent time-of-flight correction. In the case of saturated steam in the temperature
range from 100 to 350 °C (212 to 662 °f), for example, the measuring error of the distance measurement
can be reduced by this method from up to 29 % (without compensation) to less than 3 % (with
compensation).
