Endress+Hauser Fieldbus Levelflex M FMP45 Operating Instructions Manual page 92

Technical data
Reference operating
conditions
Maximum measured error
Resolution
Reaction time
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
92
10.1.4 Performance characteristics
• Temperature = +20 °C (68 °F) ±5 °C (9 °F)
• Pressure = 1013 mbar abs. (14.7 psia) ±20 mbar (0.3 psi)
• Humidity = 65 % ±20%
• Reflection factor ≥ 0.8 (surface of the water for coax probe, metal plate for rod and rope probe
with min. 1 m ∅)
• Flange for rod or rope probe ≥ 30 cm ∅
• Distance to obstructions ≥ 1 m
Is in Function group "basic setup".
• Digital: 1 mm
The reaction time is dependent on the configuration.
Shortest time:
• 2-wire electronics: 1 s
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
High pressures reduce the propagation velocity of the measuring signals in the gas/vapor above the
fluid. This effect depends on the vapor and is particularly large for high 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 %
— —
— —
— —
Levelflex M FMP45 with FOUNDATION Fieldbus
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 %
— —
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 %
Endress + Hauser