Technical data
Micropilot M FMR250 FOUNDATION Fieldbus
92
Hauser
10.1.5
Performance characteristics
Reference operating
conditions
• temperature = +20 °C ±5 °C (+68 °F ±41 °F)
• pressure = 1013 mbar abs. ±20 mbar (15 psi ±0.29 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:
• up to 1 m (3.3 ft): ±30 mm (1.18 in)
• ex 1 m (3.3 ft): ±15 mm (0.59 in) (or 0.04% of measuring range, whatever is larger)
Resolution
Digital: 1 mm (0.04 in) / 0.03 % of measuring range
Reaction time
The reaction time depends on the parameter settings (min. 1 s). In case of fast level changes, the
instrument needs the reaction time to indicate the new value.
Influence of ambiente
temperature
The measurements are carried out in accordance with EN61298-3:
• digital output FOUNDATION Fieldbus:
– average T
K
: 5 mm (0.2 in) /10 K, max. 15 mm (0.59 in) over the entire temperature range
-40 °C to +80 °C (-40 °F to +176 °F).
10.1.6
Operating conditions: Environment
Ambient temperature range
Ambient temperature for the transmitter: -40 °C to +80 °C (-40 °F to +176 °F) or
-50 °C to +80 °C (-58 °F to +176 °F). The functionality of the LCD display may be limited for
temperatures Ta < -20 °C (-4°F) and Ta > +60 °C (140 °F). A weather protection cover should be
used for outdoor operation if the instrument is exposed to direct sunlight.
Storage temperature
-40 °C to +80 °C (-40 °F to +176 °F) or -50 °C to +80 °C (-58 °F to +176 °F).
Climate class
DIN EN 60068-2-38 (test Z/AD)
Vibration resistance
DIN EN 60068-2-64 / IEC 68-2-64: 20 to 2000 Hz, 1 (m/s
2
)
2
/Hz
Cleaning of the antenna
The antenna can get contaminated, depending on the application. The emission and reception of
microwaves can thus eventually be hindered. The degree of contamination leading to an error
depends on the medium and the reflectivity, mainly determined by the dielectric constant
ε
r. If the
medium tends to cause contamination and deposits, cleaning on a regular basis is recommended.
Care has to be taken not to damage the antenna in the process of a mechanical or hose-down
cleaning (eventually air purge connection). The material compatibility has to be considered if
cleaning agents are used!
The maximum permitted temperature at the flange should not be exceeded.
Electromagnetic compatibility
Electromagnetic compatibility in accordance with all the relevant requirements of the EN61326
series and NAMUR recommendation (NE21). For details refer to the Declaration of Conformity.
Maximum deviation < 0.5 % of the span.
