
Specs at a glance
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Process temperature
-60 °C...+280 °C
(-76 °F...+540 °F)
(300°C / 572°F, 50h cumulated) -
Process pressure / max. overpressure limit
Vacuum...100 bar
(Vacuum...1450 bar) -
Min. density of medium
0.5g/cm³ (0.4g/cm³ optional)
Field of application
Liquiphant FTL71 is a point level switch with extension tube for use in hazardous areas with all international certificates. FTL71 is especially designed for applications with high process temperatures up to 280°C and can be used up to SIL2, in homogeneous redundancy up to SIL3. An integrated second line of defense offers the highest degree of safety. Reliable measurement values, not affected by: changing media properties, flow, turbulences, gas bubbles, foam, vibrations or build-up.
Point level switch for all liquids.
Process connections: Threads and flanges
Temperature: -60 to +280°C (-76 to +540°F)
Pressure: -1 to +100bar (-14.5 to +1,450psi)
Sensor material: 316L, Alloy (PFA and Enamel on request)
International explosion protection certificates, overfill prevention WHG, SIL, marine approvals
Benefits
Use in safety systems requiring functional safety to SIL2 in accordance with
IEC 61508/IEC 61511-1With welded gas-tight feed-through maximum safety in the event of damaged sensor
Wide variety of electronics, e.g. NAMUR, relay, thyristor, PFM signal output: the right connection for every process control system
Large number of process connections to choose from: universal usage
No calibration: quick, low-cost start-up
No mechanically moving parts: no maintenance, no wear, long operating life.
Monitoring of fork for damage: guaranteed functionFDA approved materials (PFA Edlon)
Videos
Extended selection
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High-end products
- Highly functional and convenient
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
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Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
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Fundamental selection Meet your basic measurement needs |
Technical excellence
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Simplicity
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Lean selection Handle your core processes easily |
Technical excellence
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Simplicity
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Extended selection Optimize your processes with innovative technologies |
Technical excellence
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Simplicity
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Xpert selection Master your most challenging applications |
Technical excellence
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Simplicity
Variable |
Predecessor
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Technical Information (TI)
Liquiphant S FTL70, FTL71 Technische Information
German version - 12/2016
Hochtemperatur-Grenzschalter für Flüssigkeiten jeder Art
EN 13/02/201708/12/201609/07/201016/06/200906/10/2005Language:
German
Version:
08/12/2016
File size:
972.3 KB
File name:
TI00354FDE_1316.pdf
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Special Documentation (SD)
Liquiphant M/S mit FEL52 Handbuch zur Funktionalen Sicherheit (SIL)
German version - 01/2019
Füllstandgrenzschalter für alle Flüssigkeiten. Einsatz auch im explosionsgefährdeten Bereich, in Lebensmitteln und Pharmaka
EN 05/03/201929/01/201901/10/2003Language:
German
Version:
29/01/2019
File size:
758.1 KB
File name:
SD00163FDE_1319.pdf
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Technical Information (TI)
Liquiphant S FTL70, FTL71 Technical Information
High-temperature point level switch for all kinds of liquids
EN 13/02/201709/07/201016/06/200906/10/2005Language:
English
Version:
13/02/2017
File size:
962.1 KB
File name:
TI00354FEN_1316.pdf
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Operating Instruction (BA)
Liquiphant M/S FTL50, FTL51, FTL50H, FTL51H, FTL51C, FTL70, FTL71 Electronic insert FEL50A PA
Vibration Limit Switch Level limit switch for all liquids. Suitable for use in hazardous areas, food and pharmaceuticals
EN 10/08/2004Language:
English
Version:
10/08/2004
File size:
836 KB
File name:
BA141FEN.pdf
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Short Instruction (KA)
Liquiphant M/S FTL51, FTL71, FTL81 Operating Instructions
High Pressure Sliding Sleeve G 1, NPT 1
EN 09/05/201731/07/201001/05/200801/10/2005Language:
English
Version:
09/05/2017
File size:
295.4 KB
File name:
KA00153FA6_1317.pdf
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Short Instruction (KA)
Liquiphant M/S FTL51, FTL71, FTL81
High Pressure Sliding Sleeve G 1 1/2, NPT 1 1/2
EN 09/05/201731/07/201001/05/200813/10/2005Language:
English
Version:
09/05/2017
File size:
280 KB
File name:
KA00154FA6_1317.pdf
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Short Instruction (KA)
Exchange of sensor on Liquiphant M/S
Exchange of sensor on Liquiphant M/S
EN 24/04/2012Language:
English
Version:
24/04/2012
File size:
398.2 KB
File name:
KA00529FA2_0908.pdf
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Short Instruction (KA)
Bedienungsanleitung/ Operating Instuction Liquiphant.
Sliding Sleeve
EN 01/05/200801/11/1998Language:
English
Version:
01/05/2008
File size:
314.8 KB
File name:
KA100fa6_0308.pdf
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Short Instruction (KA)
Liquiphant S FTL70, FTL71 Operating Instructions
High-temperature pointlevel switch for all kinds of liquids
EN 20/01/201729/06/201609/07/201001/02/2006Language:
English
Version:
20/01/2017
File size:
1.1 MB
File name:
KA00172FA6_1417.pdf
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Short Instruction (KA)
Liquiphant S FTL70-########7##, FTL71-########7## Operating Instructions
High-temperature point level switch for all kinds of liquids
EN 20/01/201730/06/201631/07/201018/03/2004Language:
English
Version:
20/01/2017
File size:
1.5 MB
File name:
KA00173FA6_1417.pdf
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Short Instruction (KA)
Bedienungsanleitung/ Operating Instuctions Liquiphant M/S + FEL57
Selbsttest Self test
EN 27/02/201701/03/2002Language:
English
Version:
27/02/2017
File size:
227.1 KB
File name:
KA00147FA6_1316.pdf
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Short Instruction (KA)
Operating Instuction Liquiphant FTL 51, FTL71, FTL81 Sliding Sleeve
Sliding Sleeve G 1½ A, 1½ NPT for Unpressurised Operation.
EN 09/05/201719/10/2005Language:
English
Version:
09/05/2017
File size:
141.4 KB
File name:
KA00152FA6_1317.pdf
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