E+H Liquipoint T FTW31 Level Switch

Fits conductive liquid point-level detection where you need multipoint rod probes (to 4 m) or related rope probes (FTW32 to 15 m) with conductivity ≥10 µS/cm and compact electronics inserts (DC-PNP / relay / NAMUR).

Key advantages

Conductive multipoint detection — Rod probes to 4 m; related FTW32 rope to 15 m; up to 5 switch points.
≥10 µS/cm liquids — Conductive point level with FEW52/54/58 inserts or separate FTW325.
IP66 field package — G 1½ / NPT 1½ connections; 316L / PP / PPS wetted options.
WHG / ATEX options — Overfill and Ex marks by order code.

Typical applications

Conductive liquid high/low multipoint detection in tanks.
Cost-effective conductive probes where vibronic or capacitance is not required.
Installs needing NAMUR, DC-PNP, or AC/DC relay electronics inserts.

Selection guide

Measuring range — Multipoint conductive detection; rod probes to 4 m (13 ft); rope probes (FTW32) to 15 m; up to 5 switch points.
Accuracy — No continuous level accuracy; point switching. Measuring error ±10 % at 100 Ω–100 kΩ / ±5 % at 1–10 kΩ (TI test conditions).
Output — FEW52 DC-PNP; FEW54 AC/DC relay; FEW58 NAMUR; or separate FTW325 transmitter.
Supply — FEW52 DC PNP ~10.8…45 V; FEW54 relay 20…230 VAC / 20…55 VDC (per TI electronics); FEW58 NAMUR.
Process connection — G 1½ / NPT 1½ (housing versions per TI).
Wetted materials — 316L, PP, PPS.
IP — IP66.
Media temperature — −40 to +100 °C (−40 to +212 °F) per process chart (depends on ambient/electronics).
Ambient — Non-haz −40…70 °C (−40…158 °F); FEW58 NAMUR −40…60 °C; storage −40…80 °C.
Process pressure — −1 to 10 bar (vacuum…145 psi).
Min conductivity — ≥10 µS/cm.
Approvals — WHG; ATEX; EAC Ex; CE.
Notes — Specs from TI00375F/00/EN/14.16. Conductivity ≥10 µS/cm required.

Common mistakes

Applying to non-conductive media below 10 µS/cm — conductive principle will not switch reliably.
Ordering FTW31 rod when tank height needs FTW32 rope (to 15 m).
Leaving electronics insert blank — FEW52 DC-PNP vs FEW54 relay vs FEW58 NAMUR vs separate FTW325.
Ignoring process pressure (−1…10 bar) and media temperature (−40…+100 °C) charts vs ambient/electronics derating.
Expecting continuous level accuracy — this is point switching only.

When to RFQ / what to tell us

Rod vs rope, probe length, number of switch points (up to 5), and media conductivity.
Electronics insert (FEW52 / FEW54 / FEW58 / FTW325), process connection (G 1½ / NPT 1½), Ex/WHG needs.
Quantity, ship-to, wetted material preference (316L / PP / PPS).

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Specs

Spec	Value
SKU	48491
Brand	Endress+Hauser
Model	Liquipoint T FTW31
Product type	level_switch
Measuring range	Multipoint conductive detection; rod probes to 4 m; rope probes (FTW32) to 15 m; up to 5 switch points
Accuracy	Point switching; measuring error ±10 % at 100 Ω–100 kΩ / ±5 % at 1–10 kΩ (TI test conditions)
Output	FEW52 DC-PNP; FEW54 AC/DC relay; FEW58 NAMUR; or separate FTW325 transmitter
Supply	FEW52 DC PNP ~10.8…45 V; FEW54 relay 20…230 VAC / 20…55 VDC; FEW58 NAMUR
Process connection	G 1½ / NPT 1½ (housing versions per TI)
Wetted materials	316L, PP, PPS
IP rating	IP66
Media temperature	−40 to +100 °C (depends on ambient/electronics)
Ambient temperature	Non-haz −40…70 °C; FEW58 NAMUR −40…60 °C; storage −40…80 °C
Process pressure	−1 to 10 bar
Min conductivity	≥10 µS/cm
Approvals	WHG; ATEX; EAC Ex; CE
Notes	Specs from TI00375F/00/EN/14.16. Conductivity ≥10 µS/cm required.

Documents

FAQ

Q: What minimum conductivity is required? A: ≥10 µS/cm.

Q: Rod or rope? A: FTW31 rods to 4 m; related FTW32 rope probes to 15 m — state tank height on the RFQ.

Q: What should I send for a quote? A: Probe type/length, switch points, electronics insert, connection, marks, quantity. Compatible with systems using Endress+Hauser Liquipoint T FTW31 — we do not claim authorized-dealer status.