Endress+Hauser Levelflex M FMP45 Operating Instructions Manual page 81

Levelflex M FMP45 with HART/4...20 mA
Influence of ambiente
temperature
Influence of gaslayer
Gaslayer Temperature
°C °F
Air 20 68
Nitrogen
200 392
400 752
Hydrogen 20 68
200 392
400 752
Gaslayer Temperatuer
°C °F
Water 100 212
(saturated
180 356
steam)
263 505,4
310 590
364 687,2
Endress + Hauser
The measurements are carried out in accordance with EN 61298-3:
• digital output (HART, PROFIBUS PA, Foundation Fieldbus):
– average T : 0.6 mm/10 K, max. ±3.5 mm over the entire temperature range -40 °C...+80 °C
K
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...+80 °C
K
– Span (20 mA)
average T : 0.05 %/10 K, max. 0.5 % over the entire temperature range -40 °C...+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...+80 °C
K
– Span (20 mA)
average T : 0.06 %/10 K, max. 0.89 % over the entire temperature range -40 °C...+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 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):
1 bar/14.5 psi 10 bar/145 psi
0,00 % 0,22 %
-0,01 % 0,13 %
-0,02 % 0,08 %
-0,01 % 0,10 %
-0,02 % 0,05 %
-0,02 % 0,03 %
1 bar/14.5 psi 10 bar/145 psi
0,20 % —
— 2,1 %
— —
— —
— —
Special versions of FMP45 are available which provide a compensation method for the gas phase
influence. Please contact your local Endress+Hauser representative.
Pressure
50 bar/725 psi 100 bar/1450 psi 200 bar/2900 psi 400 bar/5801 psi
1,2 % 2,4 %
0,74 % 1,5 %
0,52 % 1,1 %
0,61 % 1,2 %
0,37 % 0,76 %
0,25 % 0,53 %
Pressure
50 bar/725 psi 100 bar/1450 psi 200 bar/2900 psi
— —
— —
8,6 % —
— 22 %
— —
Technical data
4,9 % 9,5 %
3,0 % 6,0 %
2,1 % 4,2 %
2,5 % 4,9 %
1,6 % 3,1 %
1,1 % 2,2 %
—
—
—
—
58 %
81