Technical data Liquiphant FTL31
36 Endress+Hauser
12 Technical data
For additional information on the technical data, see the Technical Documentation
TI01147F/00/EN.
12.1 Power supply
Electronic version Supply voltage Power consumption Current consumption
3-wire DC-PNP 10 to 30 V DC < 975 mW < 15 mA
2-wire AC/DC 20 to 253 V < 850 mW < 3.8 mA
12.2 Environment
Ambient temperature range –40 to +70 °C (–40 to +158 °F), see derating → 37
Storage temperature –40 to +85 °C (–40 to +185 °F)
Climate class DIN EN 60068-2-38/IEC 68-2-38: test Z/AD
Operating altitude Up to 2 000 m (6 600 ft) above sea level
Shock resistance a = 300 m/s
2
= 30 g, 3 axes x 2 directions x 3 shocks x 18 ms,
as per test Ea, prEN 60068-2-27:2007
Vibration resistance a(RMS) = 50 m/s
2
, ASD = 1.25 (m/s
2
)
2
/Hz, f = 5 to 2 000 Hz, t = 3 x 2 h,
as per test Fh, EN 60068-2-64:2008
Reverse polarity protection 2-wire AC/DC
• AC mode: the device has reverse polarity protection.
• DC mode: in the event of reverse polarity the maximum safety mode is always
detected. Check the wiring and perform a function check before commissioning.
The device is not damaged in the event of reverse polarity.
3-wire DC-PNP
Integrated. In the event of reverse polarity, the device is deactivated automatically.
Short-circuit protection 2-wire AC/DC
During switching the sensor checks whether a load, e.g. relay or contactor, is
present (load check). If an error occurs, the sensor is not damaged.
Smart monitoring: normal operation is resumed once the error is fixed.
3-wire DC-PNP
Overload protection/short-circuit protection at I > 250 mA; the sensor is not
destroyed.
Intelligent monitoring: Testing for overload at intervals of approx. 1.5 s; normal
operation resumes once the overload/short-circuit has been rectified.
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