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Endress+Hauser
Endress+Hauser Liquiphant FTL51B Vibronic Level Switch
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E+H Liquiphant FTL51B: vibronic point level; to 6 m; FEL inserts; 316L/Alloy. RFQ.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Measuring range
Point level; sensor length up to 6 m (20 ft) depending on installation/extension ordered
Accuracy
Millimetre-class switching point (product-independent); hysteresis/switching delay per electronics
Output
Electronic inserts: 2-wire AC (FEL61); 3-wire DC PNP (FEL62); universal AC/DC relay (FEL64); DC relay (FEL64DC); PFM (FEL67); 2-wire NAMUR (FEL68); HART/PROFINET-APL variants in related TI
Supply
Depends on insert: e.g. FEL61 19–253 VAC; FEL62 PLC PNP (SELV/CLASS 2); FEL64 19–253 VAC / 19–55 VDC; FEL64DC 9–20 VDC
Process connection
Threads, flanges, hygienic (Tri-Clamp) per order
Wetted parts
316L, Alloy (sensor); process adapters per TI
Fits extended vibronic point level where you need an Endress+Hauser Liquiphant FTL51B. Point-level switch with sensor length up to 6 m depending on extension, millimetre-class product-independent switching, electronic inserts including 2-wire AC, 3-wire DC-PNP and universal AC/DC relay, with 316L/Alloy wetted options.
Key advantages
- Length — Sensor up to 6 m (20 ft)
- Principle — Vibronic point level
- Inserts — FEL61/62/64 and variants
- Connections — Thread / flange / hygienic
- Wetted — 316L, Alloy options
Typical applications
- Tank high/low level.
- Pump dry-run protection.
- Extended vibronic probes.
Selection guide
- Sensor length
- Electronic insert
- Process connection
Common mistakes
- Wrong insert voltage.
- Buildup on fork.
- Density too low.
When to RFQ / what to tell us
- Length/insert/connection.
- Quantity, ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 47689 |
| Brand | Endress+Hauser |
| Model | Liquiphant FTL51B |
| Product type | Level Switch |
| Measuring range | Point level; sensor length up to 6 m (20 ft) depending on installation/extension ordered |
| Accuracy | Millimetre-class switching point (product-independent); hysteresis/switching delay per electronics |
| Output signal | Electronic inserts: 2-wire AC (FEL61); 3-wire DC PNP (FEL62); universal AC/DC relay (FEL64); DC relay (FEL64DC); PFM (FEL67); 2-wire NAMUR (FEL68); HART/PROFINET-APL variants in related TI |
| Supply voltage | Depends on insert: e.g. FEL61 19–253 VAC; FEL62 PLC PNP (SELV/CLASS 2); FEL64 19–253 VAC / 19–55 VDC; FEL64DC 9–20 VDC |
| Process connection | Threads, flanges, hygienic (Tri-Clamp) per order |
| Wetted materials | 316L, Alloy (sensor); process adapters |
Documents
FAQ
Q: Max length? A: Up to 6 m.
Q: Inserts? A: FEL61/62/64 and variants.
Q: What should I send for a quote? A: Length/insert/connection, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Point level; sensor length up to 6 m (20 ft) depending on installation/extension ordered |
| Accuracy | Millimetre-class switching point (product-independent); hysteresis/switching delay per electronics |
| Output | Electronic inserts: 2-wire AC (FEL61); 3-wire DC PNP (FEL62); universal AC/DC relay (FEL64); DC relay (FEL64DC); PFM (FEL67); 2-wire NAMUR (FEL68); HART/PROFINET-APL variants in related TI |
| Supply | Depends on insert: e.g. FEL61 19–253 VAC; FEL62 PLC PNP (SELV/CLASS 2); FEL64 19–253 VAC / 19–55 VDC; FEL64DC 9–20 VDC |
| Process connection | Threads, flanges, hygienic (Tri-Clamp) per order |
| Wetted parts | 316L, Alloy (sensor); process adapters per TI |
| Housing | Field housing with M20 / ½ NPT / M12 entries |
| Protection | IP66/68 NEMA Type 4X/6P (cable entries); M12 plugged IP66/67; IP68 test 1.83 m H2O 24 h |
| Media temperature | −50 to +150 °C (−58 to +302 °F) |
| Ambient temperature | Ambient range per TI environment section (electronics options to −60 °C LT) |
| Display | Optional LED module VU120; Bluetooth module VU121 |
| Communication | Bluetooth (Heartbeat/SmartBlue); optional HART / Ethernet-APL variants |
| Approvals | SIL2; SIL3; ATEX; IECEx; WHG; CE |
| Notes | Specs from E+H TI01403F EN 07.25-00 (2025-10-13). |
| Process Pressure | Vacuum…100 bar (1450 psi) |
| Min Density | 0.5 g/cm³ (0.4 g/cm³ optional); density selection switch >0.7 g/cm³ typical |
| Viscosity | Up to 10000 mPa·s |