Performance Characteristics; Reference Operating Conditions; Reference Accuracy - Endress+Hauser Levelflex FMP51 Modbus Technical Information

Reference operating
conditions

Reference accuracy

20

Performance characteristics

• Temperature = +24 °C (+75 °F) ±5 °C (±9 °F)
• Pressure = 960 mbar abs. (14 psia) ±100 mbar (±1.45 psi)
• Humidity = 60 % ±15 %
• Reflection factor ≥ 0,8 (water surface for coax probe, metal plate for rod and rope probe with min.
1 m (40 in) diameter)
• Flange for rod or rope probe ≥ 300 mm (12 in) diameter
• Distance to obstacles ≥ 1 m (40 in)
• For interface measurement:
– Coax probe
– DC of the lower medium = 80 (water)
– DC of the upper medium = 2 (oil)
Typical data under reference operating conditions: DIN EN IEC 61298-2 / DIN EN IEC 60770-1,
percentage values in relation to the span.
Output: digital
Accuracy (Sum of non- Level measurement:
linearity, nonrepeatability • Measuring distance up to 15 m (49 ft): ±2 mm (±0.08 in)
2)
and hysteresis) • Measuring distance > 15 m (49 ft): ±10 mm (±0.39 in)
Interface measurement:
• Measuring distance up to 500 mm (19.7 in):
• Measuring distance > 500 mm (19.7 in): ±10 mm (±0.39 in)
• If the thickness of the upper medium is < 100 mm (3.94 in):
4)
Non-repeatability ≤ 1 mm (0.04 in)
1) Add error of the analogous value to the digital value.
2) If the reference conditions are not met, the offset/zero point arising from the mounting conditions may be
up to ±16 mm (±0.63 in). This additional offset/zero point can be compensated for by entering a
correction (parameter "level correction") during commissioning.
3) For probes with centering stars, the accuracy may deviate close to the centering stars.
4) The non-repeatability is already considered in the accuracy.
±20 mm (±0.79 in)
±40 mm (±1.57 in)
Levelflex FMP51 Modbus
1)
analog
±0.02 %
3)
Endress+Hauser