Installation Instructions

Micropilot FMR20 Modbus RS485
Endress+Hauser 13
Cable specification
Unshielded cable, wire cross-section 0.22 mm
2
• UV- and weather-resistant
• Flame resistance according to IEC 60332-1-2
As per IEC/EN 60079-11 section 10.9, the cable is designed for a tensile strength of 30 N (6.74 lbf)
(over a period of 1 h).
The device is supplied with 5 m (16 ft) cable length as standard. Cable lengths 10 m (33 ft) and
20 m (66 ft) are optionally available.
User-defined lengths up to total length of 300 m (980 ft) are possible in increments of one meter or
one foot.
Overvoltage protection
The device is equipped with integrated overvoltage protection.
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 diameter ≥ 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.
Digital output; Modbus, SmartBlue (app)
• Sum of non-linearity, non-repeatability and hysteresis: ±2 mm (±0.08 in)
• Offset/zero point: ±4 mm (±0.16 in)
Differing values in near-range applications
0
0.5 (1.67)
D[m ](ft)
∆
[mm (in)]
2 (0.08)
10 (0.39)
-20 (-0.79)
20 (0.79)
-2 (-0.08)
-10 (-0.39)
R
R
0.1 (0.33)
R
A0033255
 9 Maximum measured error in near-range applications; values for standard version
∆ Maximum measured error
R Reference point of the distance measurement
D Distance from reference point of antenna
Measured value resolution
Dead band as per EN61298-2:
Digital: 1 mm (0.04 in)