Input; Measured Variable; Measuring Range; Output - Endress+Hauser Liquiphant FTL31 Manual

Liquiphant FTL31

Measured variable

Measuring range

Switch output

Operating modes

Supply voltage

Power consumption

Current consumption

Residual ripple

Endress+Hauser

Input

Density
> 0.7 g/cm³ (optionally available: > 0.5 g/cm³)

Output

Switching behavior: On/Off
Function
3-wire DC-PNP:
Positive voltage signal at the switch output of the electronics (PNP), switching capacity 200 mA
2-wire AC/DC:
Load switching in the power supply line, switching capacity 250 mA
The device has two operating modes: maximum safety (MAX) and minimum safety (MIN).
By choosing the corresponding operating mode, the user ensures that the device also switches in a
safety-oriented manner even in an alarm condition, e.g. if the power supply line is disconnected.
• Maximum safety (MAX)
The device keeps the electronic switch closed as long as the liquid level is below the fork. Sample
application: overfill prevention
• Minimum safety (MIN)
The device keeps the electronic switch closed as long as the fork is immersed in liquid. Sample
application: Dry running protection for pumps
The electronic switch opens if the limit is reached, if a fault occurs or the power fails (quiescent
current principle).

Power supply

DC-PNP: 10 to 30 V DC, 3-wire
AC/DC: 20 to 253 V AC/DC, 2-wire
DC-PNP: < 975 mW
AC/DC: < 850 mW
DC-PNP: < 15 mA
AC/DC: < 3.8 mA
DC-PNP: 5 Vss 0 to 400 Hz
AC/DC: —
5