Resolution; Reaction Time; Influence Of Ambiente Temperature; Influence Of Gaslayer - Endress+Hauser Levelflex M FMP41C Technical Information

Resolution

Reaction time

Influence of ambiente
temperature
Influence of gas layer
Gas layer Temperature
°C °F
Air 20 68
Nitrogen
200 392
400 752
Hydrogen 20 68
200 392
400 752
Gaslayer Temperature
°C °F
Water 100 212
(saturated
180 356
steam)
263 505.4
310 590
364 687.2
18
• digital: 0.04" (1 mm)
• analogue: 0.03 % of measuring range
The reaction time depends on the configuration (min. 1 s).
Shortest time:
• 2-wire electronics: 1 s
• 4-wire electronics: 0.7 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 to +176°F
K
(-40 to +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 to +176°F (-40 to +80°C)
K
– Span (20 mA)
average T : 0.05%/10 K, max. 0.5% over the entire temperature range -40 to +176°F (-40 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 to +176°F (-40 to +80°C)
K
– Span (20 mA)
average T : 0.06%/10 K, max. 0.89% over the entire temperature range -40 to +176°F (-40 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 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/5800 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 %
— —
Levelflex M FMP41C, FMP45
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