Endress+Hauser Micropilot M FMR230, Operating Instructions Manual

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Micropilot M FMR244 with FOUNDATION Fieldbus Technical data
Hauser 91
Reaction time The reaction time depends on the parameter settings (min. 1 s). In case of fast level changes, the
instrument needs the reaction time to indicate the new value.
Effect of gas phase High pressures reduce the propagation velocity of the measuring signals in the gas/vapor above the
fluid. This effect depends on the gas/vapor and is particularly large for low temperatures. This
results in a measuring error that gets bigger as the distance increases between the device zero point
(flange) and product surface. The following table illustrates this measured error for a few typical
gases/vapors (with regard to the distance; a positive value means that too large a distance is being
measured):
Note!
When the pressure is known and constant, this measured error can, for example, be compensated
by means of linearization.
Gas phase 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
Air
Nitrogen 20 68 0.00 % 0.22 % 1.2 % 2.4 % 3.89 %
200 392 -0.01 % 0.13 % 0.74 % 1.5 % 2.42 %
400 752 -0.02 % 0.08 % 0.52 % 1.1 % 1.70 %
Hydrogen 20 68 -0.01 % 0.10 % 0.61 % 1.2 % 2.00 %
200 392 -0.02 % 0.05 % 0.37 % 0.76 % 1.23 %
400 752 -0.02 % 0.03 % 0.25 % 0.53 % 0.86 %
Gas phase 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 0.20 % — — — —
180 356 — 2.1 % — — —
263 505.4 — — 8.6 % — —
310 590 — — — 22 % —
364 687.2 — — — — 41.8 %