Micropilot FMR62
26 Endress+Hauser
The following step response times apply (in accordance with DIN EN IEC 61298-2 /
DIN EN IEC 60770-1) when damping is switched off:
• Measuring rate ≥ 1.3 s
–1
at U ≥ 24 V
• Step response time < 3.6 s
Influence of ambient
temperature
The measurements are performed according to DIN EN IEC 61298-3 / DIN EN IEC 60770-1
• Digital (HART): average T
C
= 2 mm/10 K
• Analog (current output):
• Zero point (4 mA): average T
C
= 0.02 %/10 K
• Span (20 mA): average T
C
= 0.05 %/10 K
Influence of gas phase
High pressure reduces the speed of propagation of the measuring signals in the gas/vapor above the
medium. This effect depends on the type of gas phase and its temperature. This results in a
systematic measured error that increases with increasing distance between the reference point of
the measurement (flange) and the surface of the product. The following table shows this measured
error for a few typical gases/vapors (with regard to the distance, a positive value means that a too
large distance is measured):
Gas phase Temperature Pressure
°C °F 1 bar (14.5 psi) 10 bar (145 psi) 25 bar (362 psi)
Air/nitrogen 20 68 0.00 % 0.22 % 0.58 %
200 392 –0.01 % 0.13 % 0.36 %
400 752 –0.02 % 0.08 % 0.29 %
Hydrogen 20 68 –0.01 % 0.10 % 0.25 %
200 392 –0.02 % 0.05 % 0.17 %
400 752 –0.02 % 0.03 % 0.11 %
Water (saturated steam) 100 212 0.02 % - -
180 356 - 2.1 % -
263 505.4 - - 4.15 %
310 590 - - -
364 687 - - -
With a known, constant pressure, it is possible to compensate for this measured error with a
linearization, for example.
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