D
R
A
F
T
Micropilot FMR53, FMR54
30
V. 1, Rev. 7, 26-10-2012
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
m
A
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.
