The level probe LFH is a robust pressure transmitter for continuous level measurement. The liquid column above the probe creates a hydrostatic pressure which is a direct indicator for the liquid level. Through its permanently connected
cable the LFH is submerged into the liquid to be monitored. Thus, the container wall does not need to be disturbed to fit a level sensor.

Product features

• Immersion depth up to 100 m (optionally up to 250 m)
• Measuring ranges from 0 ... 1 mH2O to 0 ... 100 mH2O (optional up to 250 mH2O)
• Stainless steel membrane
• Hermetically sealed stainless steel housing with protection cap made from PA
• Enclosure rating IP 68
• Available with various cable lengths
• Cable made from PUR, FEP-cable for aggressive media optionally available
• Maximum tensile strength of the cable 1000 N
• Optional temperature measurement with integrated Pt100-element, 4-wire

Customer benefits

• Enables level measurement under difficult conditions where other measurement technologies fail
• No openings required in the wall of the vessel
• For cleaning purposes the probe can easily be taken out of the liquid
• High reliability through rugged design and robust materials

Applications

• Deep well
• Hydrostatic level measurement in large vessels
• In water up to 100 m depth (optionally up to 250m)
• Sewerage plants

For level measurement highly sensitive gauge pressure transmitters with stainless steel membranes are used. Hydrostatic level measurement requires pressure compensation relative to the atmosphere. This is realized by a capillary tube inside the connecting cable. The LFH provides an output signal that is proportional to the applied pressure and hence, proportional to the height of the liquid column above the probe.

Accuracy +/- 0.5% of Span
4...20 mA, 2-wire
Standard cable (PUR, -10...+50°C)
Supply voltage 10...30 V DC

Model name	Measuring range	Cable length	Part. No
LFH-SBX25G1AS01SZ0	0.25 bar	1.5m	6040938
LFH-SBX25G1AS03SZ0	0.25 bar	3m	6040939
LFH-SBX25G1AS05SZ0	0.25 bar	5m	6040940
LFH-SBX25G1AS10SZ0	0.25 bar	10m	6040941
LFH-SBX40G1AS05SZ0	0.4 bar	5m	6040942
LFH-SBX40G1AS10SZ0	0.4 bar	10m	6040943
LFH-SBX40G1AS15SZ0	0.4 bar	15m	6040944
LFH-SBX40G1AS20SZ0	0.4 bar	20m	6040945
LFH-SBX60G1AS05SZ0	0.6 bar	5m	6040946
LFH-SBX60G1AS10SZ0	0.6 bar	10m	6040947
LFH-SBX60G1AS15SZ0	0.6 bar	15m	6040948
LFH-SBX60G1AS20SZ0	0.6 bar	20m	6040949
LFH-SB1X0G1AS10SZ0	1.0 bar	10m	6040950
LFH-SB1X0G1AS15SZ0	1.0 bar	15m	6040951
LFH-SB1X0G1AS20SZ0	1.0 bar	20m	6040952
LFH-SB1X0G1AS25SZ0	1.0 bar	25m	6040953
LFH-SB1X6G1AS15SZ0	1.6 bar	15m	6040954
LFH-SB1X6G1AS20SZ0	1.6 bar	20m	6040955
LFH-SB1X6G1AS25SZ0	1.6 bar	25m	6040956
LFH-SB1X6G1AS30SZ0	1.6 bar	30m	6040957

Choose your configuration with the LFH type code (see LFH data sheet).
For further part numbers please contact SICK's sales departement.