Endress+Hauser Levelflex M FMP45 Operating Instructions Manual page 78

Technical data
Influence of ambiente
temperature
Influence of gaslayer
78
The measurements are carried out in accordance with EN 61298-3:
• digital output:
– average T : 0.6 mm/10 K, max. ±3.5 mm over the entire temperature range -40 °C to
K
+80 °C.
2-wire
• Current output (additional error, in reference to the span of 16 mA):
– Zero point (4 mA)
average T : 0.032 %/10 K, max. 0.35 % over the entire temperature range -40 °C to +80 °C.
K
– Span (20 mA)
average T : 0.05 %/10 K, max. 0.5 % over the entire temperature range -40 °C to +80 °C.
K
4-wire
• Current output (additional error, in reference to the span of 16 mA):
– Zero point (4 mA)
average T : 0.02 %/10 K, max. 0.29 % over the entire temperature range -40 °C to +80 °C.
K
– Span (20 mA)
average T : 0.06 %/10 K, max. 0.89 % over the entire temperature range -40 °C to +80 °C.
K
High pressures reduce the propagation velocity of the measuring signals in the gas/vapor above the
fluid. This effect depends on the kind of gas/vapor and of its temperature. 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):
Gaslayer Temperature
°C °F
(14.5 psi)
Air 20 68
200 392
400 752
Hydrogen 20 68
200 392
400 752
Gaslayer Temperature
°C °F
Water 100 212
(saturated
180 356
steam)
263 507
310 592
364 691
1 bar 10 bar 50 bar
(145 psi) (725 psi)
0,00 % 0,22 % 1,2 %
-0,01 % 0,13 % 0,74 %
-0,02 % 0,08 % 0,52 %
-0,01 % 0,10 % 0,61 %
-0,02 % 0,05 % 0,37 %
-0,02 % 0,03 % 0,25 %
1 bar 10 bar
(14.5 psi) (145 psi)
0,20 % -
- 2,10 %
- -
- -
- -
Levelflex M FMP45 4 to 20 mA HART
Pressure
100 bar 200 bar
(1450 psi) (2900 psi)
2,4 % 4,9 %
1,5 % 3,0 %
1,1 % 2,1 %
1,2 % 2,5 %
0,76 % 1,6 %
0,53 % 1,1 %
Pressure
50 bar 100 bar
(725 psi) (1450 psi)
- -
- -
8,6 % -
- 22,0 %
- -
Endress+Hauser
400 bar
(5801 psi)
9,5 %
6,0 %
4,2 %
4,9 %
3,1 %
2,2 %
200 bar
(2900 psi)
-
-
-
-
58 %