Technical data
Micropilot M FMR 231 with HART/4...20 mA
76
E Hauser
10
Technical data
10.1
Additional technical data
10.1.1
Input
Measured variable
The measured variable is the distance between a reference point and a reflective
surface (i.e. medium surface).
The level is calculated based on the tank height entered.
The level can be converted into other units (volume, mass) by means of a linearization.
10.1.2
Output
Output signal
4…20 mA with HART protocol
Signal on alarm
Error information can be accessed via the following interfaces:
•
Local display:
– Error symbol (see Page 30)
– Plain text display
•
Current output
•
Digital interface
Linearization
The linearization function of the Micropilot M allows the conversion of the measured
value into any unit of length or volume. Linearization tables for calculating the volume in
cylindrical tanks are pre-programmed. Other tables of up to 32 value pairs can be
entered manually or semi-automatically.
10.1.3
Auxiliary energy
Ripple HART
47...125 Hz: Uss = 200 mV (at 500
Ω
)
Max. noise HART
500 Hz...10 kHz: Ueff = 2.2 mV (at 500
Ω
)
10.1.4
Performance characteristics
Reference operating
conditions
•
temperature = +20 °C (68 °F) ±5 °C (9 °F)
•
pressure = 1013 mbar abs. (14.7 psia) ±20 mbar (0.3 psi)
•
relative humidity (air) = 65 % ±20%
•
ideal reflector
•
no major interference reflections inside the signal beam
Maximum measured error
Typical statements for reference conditions, include linearity, repeatability, and
hysteresis:
•
FMR 231: up to10 m ±10 mm, off10 m ±0.1% of measuring range
