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Endress+Hauser FTL51B-29FJ20 Liquiphant M compact vibrating fork level switch — 316L wetted parts, 3/4" NPT male process connection, SPST relay NO/NC output, 20–253 V AC/DC supply. For liquids, density ≥ 0.5 g/cm³, no calibration required.
Product Overview
The Endress+Hauser FTL51B-29FJ20 is a compact Liquiphant M series vibrating fork (tuning fork) level switch for point-level detection of liquids in tanks, pipes, and sumps. The fork is made of 316L stainless steel with a 3/4" NPT male process connection, suitable for hygienic and industrial applications. It operates on the piezoelectric-driven resonance principle — the fork vibrates at its natural frequency (~1300 Hz) and stops vibrating when covered by liquid, triggering the SPST relay output (NO/NC, DPDT contact block style — option-dependent; -29FJ20 typically denotes 20–253 V AC/DC supply with relay output). No calibration or density adjustment is required; it ignores foam, conductivity, dielectric constant, and buildup. Suitable for overfill alarm, dry-run protection, and pump control in water/wastewater, chemical, and food & beverage industries.
Technical Specifications (Electrical & Output)
Parameter
Specification
Order Code
FTL51B-29FJ20 (Liquiphant M — Basic Version)
Series
Endress+Hauser Liquiphant M (FTL51B Compact)
Measured Medium
Liquids (conductive & non-conductive), min. density ≥ 0.5 g/cm³
Fork prongs ≈ 40 mm (standard compact design — no extension)
Ambient Temperature
-40 … +70 °C
Process Temperature
-40 … +150 °C
Process Pressure
-1 … +40 bar (-0.1 … +4.0 MPa)
Degree of Protection
IP66 / IP67 (EN 60529), NEMA 4X
Approvals (Typical)
CE, cCSAus General Purpose; optionally ATEX / IECEx Ex d / Ex ia — verify per suffix
Weight (Approx.)
~1.3 kg
Key Features
No Calibration Required: Piezo-driven fork — immune to changing media properties (dielectric, conductivity, foam, viscosity within limits).
Universal AC/DC Supply (20–253 V): Single part covers both AC and DC panel supplies — simplifies spare stocking.
Compact Fork Design: Minimal intrusion into tank — suitable for small vessels, pump pits, and pipe tees.
Self-Monitoring Electronics: Continuous diagnostic check of fork oscillation — fails to safe state on fault (e.g. fork fouling beyond limits or electronics failure).
Robust 316L Construction: Corrosion-resistant wetted parts for water, wastewater, chemicals, and CIP/SIP-compatible processes.
Typical Applications
Pump Protection: Dry-run prevention in lift stations, booster sets, and chemical dosing skids.
Overfill / Low-Level Alarm: Tank high-level alert in chemical storage, food ingredient tanks, and IBC totes.
Sumps & Wet Wells: Sewage/storm-water wet well level switching — unaffected by turbulence or foam.
Process Skid Integration: Point-level detection in modular process units where compactness and no-adjustment operation are valued.
FTL51B is the compact (basic) Liquiphant M. For hygienic clamp/tri-clamp or larger fork extensions, see FTL50 / FTL51. The suffix "-29FJ20" typically decodes as: 29 = universal 20–253V AC/DC supply with relay output; F = housing/electronics version; J20 = 3/4" NPT male process connection. Exact option letter mapping may vary slightly by region — always cross-check the Endress+Hauser certificate of conformity / order confirmation for approval details (Ex / WHG / SIL). Many FTL51B variants are SIL 2 / SIL 3 capable per IEC 61508.
Founded in 2012, ACH is a top-tier distributor of industrial automation products, supplying genuine devices from leading brands like ABB, P+F, E&H, AB, MTL to emerging markets worldwide. Our mission is to provide 100% Genuine products at the most competitive prices, helping customers reduce costs and strengthen their market position.
Frequently Ask & Questions
Are preferential prices available?
Long-term brand partners can get competitive product prices. At the same time, ACH controls the profit per order to 5%, providing the most competitive prices.
Are the Products Genuine OEM Units?
Yes, all products from ACH are certified genuine OEM units. We acquire our inventory through official OEM channels and trusted third-party suppliers, ensuring every item is authentic and reliable.
How will you arrange shipment?
We'll handle the shipping for you. Through our partnerships, we can secure competitive rates with major carriers like FedEx, DHL, TNT, and UPS, ensuring a smooth and cost-effective delivery.
What is the warranty of goods?
One-year Warranty.
How long is the logistics cycle of the product?
Products are divided into spot and futures, and the delivery period of different brands of products is also different. For details, please contact the ACH business manager.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Agent,Importer,Trading Company
Year Established:
2012
Total Annual:
2000000-3000000
Employee Number:
>50
Ecer Certification：
Verified Supplier
A Decade of Global Excellence in Electromechanical Trade
ACH established in 2012 with offices in Shenzhen and Hong Kong, is a high-efficiency multi-brand distributor of industrial automation products.
We specialize in supplying world-leading brands such as Bradley,,E... A Decade of Global Excellence in Electromechanical Trade
ACH established in 2012 with offices in Shenzhen and Hong Kong, is a high-efficiency multi-brand distributor of industrial automation products.
We specialize in supplying world-leading brands such as Bradley,,E...
