Endress and Hauser GmbH and Co FMR6XET ユーザーズマニュアル
Micropilot FMR62
Endress+Hauser
V. 4, Rev. 2, 19-03-2018
27
Sampling rate
≥1.3 s
–1
at U ≥ 24 V
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
K
= 3 mm/10 K
• Analog (current output):
– Zero point (4 mA): average T
K
= 0.02 %/10 K
– Span (20 mA): average T
K
= 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.