Prosonic M
20 Endress+Hauser
Operating conditions: Environment
Ambient temperature -40 °C to +80 °C (-40 °F to +176 °F)
The functionality of the LC display becomes restricted at Tu<-20 °C (Tu<-4 °F) and Tu>+60 °C (Tu>140 °F).
If the device is operated outdoors in strong sunlight, you should use a protective cover → ä 39, "Weather
protection cover".
Storage temperature -40 °C to +80 °C (-40 °F to +176 °F)
Resistance to alternating
temperature cycles
to DIN EN 60068-2-14; Nb test : +80°C/-40°C, 1K/min, 100cycles
Climate class DIN EN 60068-2-38 (Test Z/AD) DIN/IEC 68 T2-30Db
Ingress protection • With closed housing, tested according to
– IP 68, NEMA 6P (24h at 1.83 m (6 ft) under water surface)
– IP 66, NEMA 4x
• With open housing: IP 20, NEMA 1 (also ingress protection of the display)
Caution!
Degree of protection IP 68 NEMA 6P applies for M12 PROFIBUS-PA plugs only when the PROFIBUS cable is
plugged in.
Vibration resistance DIN EN 60068-2-64 / IEC 68-2-64: 20…2000 Hz, 1 (m/s
2
)
2
/Hz; 3 x 100 min
Electromagnetic compatibility
(EMC)
• Electromagnetic compatibility according to all relevant requirements of the EN 61326- series and NAMUR
recommendation EMC (NE21). For details see declaration of conformity.
• A standard installation cable is sufficient if only the analogue signal is used. Use a screened cable when
working with a superimposed communication signal (HART).
Operating conditions: Process
Process temperature -40°C to +80°C (-40 °F ... +176 °F)
A temperature sensor is integrated in the sensor for correction of the temperature-dependent time-of-flight.
Process pressure • FMU40/41: 0.7 bar to 3bar abs. (10.15 psi ... 43.5 psi abs.)
• FMU42/43/44: 0.7 bar to 2.5bar abs. (10.15 psi ... 36.25 psi abs.)
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