User's Manual

DRAFT
Micropilot FMR53, FMR54
30 V. 1, Rev. 7, 26-10-2012 Endress+Hauser
Performance characteristics
Reference operating
conditions
• Temperature = +24 °C (+75 °F) ±5 °C (±9 °F)
• Pressure = 960 mbar abs. (14 psia) ±100 mbar (±1.45 psi)
• Humidity = 60 % ±15 %
• Reflector: metal plate with a minimum diameter of 1 m (40 in)
• No major interference reflections inside the signal beam
Maximum measured error
Typical data under reference operating conditions: DIN EN 61298-2, percentage values in relation to the
span.
Device Value Output
digital analog
1)
FMR53/FMR54 Sum of non-linearity,
nonrepeatability and
hysteresis
± 6 mm (0.24 in)
throughout the
complete measuring
range
± 0.02 %
Offset/Zero
± 4 mm (0.2 in) ± 0.03 %
1) Add error of the analogous value to the digital value.
Measured value resolution
Dead band according to EN61298-2:
• digital: 1 mm
•
analog: 1 mA
Reaction time
The reaction time can be parametrized. The following step response times (as per DIN EN 61298-2)
1)
are
valid if the damping is switched off:
Tank height
Sampling rate Step response time
< 10 m (33 ft) ³ 3.6 s
–1
< 0.8 s
< 20 m (66 ft) ³ 2.7 s
–1
< 1 s
Influence of ambient
temperature
The measurements are carried out in accordance with EN 61298-3
• Digital (HART, PROFIBUS PA): average T
K
= 3 mm/10 K; maximum 10 mm
• 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 layer
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 systematic measuring
error that gets bigger as the distance increases between the reference point of the measurement (flange) and
the product surface. The following table illustrates this measured error for a few typical gases/vapors (with
regard to distance; a positive value means that too large a distance is being measured):
Gas layer
Temperature Pressure
°C °F 1 bar (14,5 psi) 10 bar (145 psi) 50 bar (725 psi) 100 bar (1450 psi) 160 bar (2320 psi)
Air/
Nitrogen
20 68 0.00 % 0.22 % 1.2 % 2.4 % 3.89 %
200 392 –0.01 % 0.13 % 0.74 % 1.5 % 2.42 %
400 752 –0.02 % 0.08 % 0.52 % 1.1 % 1.70 %
Hydrogen 20 68 –0.01 % 0.10 % 0.61 % 1.2 % 2.00 %
200 392 –0.02 % 0.05 % 0.37 % 0.76 % 1.23 %
400 752 –0.02 % 0.03 % 0.25 % 0.53 % 0.86 %
1) According to DIN EN 61298-2 the response time is the time which passes after a sudden change of the input signal until the output signal for the first time
assumes 90% of the steady-state value.