The New Liquiphant FailSafe from Endress+Hauser

Point level switch for the maximum degree of safety

Many processes now require SIL (Safety Integrity Level) compatible point level switches for pump and overfill protection. Unfortunately, this often comes at a high price. The installation of homogeneously redundant instruments to meet functional safety requirements can not only be costly, it can present increased risk with added process connections. Moreover, requirements for interval proof testing can bring about damage to instruments during removal and lead to increased process downtime.


  • 4-20 mA interface according to NAMUR NE06 / NE43

  • Easy integration via the switching unit (Nivotester FailSafe FTL825) with a two-channel output and locking function or direct integration into a safety PLC

  • Use in safety systems requiring functional safety to SIL3

  • Proof test: proof testing interval up to 12 years

  • Slave devices tested at the press of a button

  • Permanent self-monitoring/internal redundancy

  • No adjustment: quick, low-cost startup

  • No mechanically moving parts: no maintenance, no wear, long operating life

  • Self-monitoring of fork for damage, corrosion, buildup and mechanical blocking

  • An additional process seal (2nd line of defense) is provided as standard in the high-temperature version or can be optionally selected for all other versions

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These problems can be solved...with just one device!


The newest line of Liquiphant FailSafe level switches from Endress+Hauser utilizes internal redundancy to offer functional safety up to SIL3, with just one device. The result is high plant availability, low long-term maintenance costs and extended proof test intervals up to 12 years.