Technical data
Micropilot S FMR540 4 to 20 mA HART
70
Hauser
10.1.5
Performance characteristics
Reference operating
conditions
According to OIML R85:
• Temperature = –25 °C to +55 °C (-13 °F to +131 °F)
• Atmospheric pressure
• Relative humidity (air) = 60 % ±15 %
• Medium properties: e.g. medium with good reflectivity and calm surface
• Tank diameter: signal beam hits the tank wall only at one side
• No major interference reflections inside the signal beam
Maximum measured error
Absolute accuracy: better than ±1 mm (better than 1/16")
Resolution
Digital 0.1 mm/analogue: 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 device needs the reaction time to indicate the new value.
Influence of ambiente
temperature
•
Zero point (4 mA)
average T
K
: 0,025 %/10 K, max. 0,291 % over the entire temperature range -40 °C to +80 °C
•
Span (20 mA)
average T
K
: 0,07 %/10 K, max. 0,824 % over the entire temperature range -40 °C to +80 °C
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 and Ta > +60 °C. A weather protection cover should be used for outdoor
operation if the device 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 relevant requirements of the EN 61326
series and NAMUR recommendation EMC (NE21). For details refer to the Declaration of
Conformity. Maximum deviation <0.5 % of the span.
• A standard installation cable is sufficient if only the analogue signal is used. Use a screened cable
when working with a superimposed communications signal (HART).
