Endress+Hauser Liquiphant M FTL50

Other manuals for Endress+Hauser Liquiphant M FTL50

Technical Information52 pages

Safety Instructions44 pages

Questions and Answers

E
Emily BrewerAug 6, 2025
Why is my Endress+Hauser Liquiphant M FTL50 sporadically faulty switching?
- W
  William SmithAug 6, 2025
  Sporadic faulty switching of your Endress+Hauser Switch can occur due to several reasons. If there's thick, heavy foam, turbulent conditions, or foaming liquid, consider mounting the Liquiphant in a bypass. Extreme RFI (Radio-Frequency Interference) can be mitigated by using a shielded cable. For extreme vibration, try decoupling, damping, or turning the fork 90°. Water in the housing can cause issues, so ensure the cover and cable gland are tightly screwed. If you're using FEL52, an overloaded output could be the problem; reduce the load or cable capacitance.
N
Natasha MorganAug 15, 2025
What to do if Endress+Hauser Liquiphant M FTL50 switches incorrectly after power failure?
- R
  rodrigueznathanAug 15, 2025
  If your Endress+Hauser Switch switches incorrectly after a power failure, observe the switching behavior of FEL57 during the switch-on test (functional test). After a power failure, block plant control for up to 45 seconds.
M
Michael StevensOct 26, 2025
What to do if my Endress+Hauser Switch does not switch?
- D
  Dawn CruzOct 26, 2025
  If your Endress+Hauser Switch isn't switching, start by checking the power supply and signal line. If the FEL51 is connected directly to L1 and N, exchange it and ensure it's always connected via an external load. Verify that the liquid density is set to >0.5 on the electronic insert. Also, inspect the fork for any encrustation and clean it if necessary. If the fork is corroded, indicated by red/yellow flashes on the FEL or green flashes on FEL58, replace the fork and process connection. For FEL51 issues, ensure the connected relay's internal resistance is not too large by connecting a suitable relay, and that the holding current of the connected relay isn't too low by connecting a resistor in parallel with the relay. If you have FEL54, and the contacts are welded together after a short-ci...

Summary

Safety Instructions

Approved usage

Details the intended application of the Liquiphant M FTL50 and FTL51 for level limit detection in liquids.

Safety pictograms and symbols

Explains the meaning and use of safety symbols and pictograms found in the operating instructions.

Handling

Provides guidance on the proper handling of the device, including how to hold it.

Order Codes

Product structure

Details the structural components and options available for the Liquiphant M FTL50 and FTL51 devices.

Certificates, applications

Lists various certifications and application-specific versions for hazardous and non-hazardous areas.

Process connection, material

Specifies different process connection types and materials with their corresponding weights.

Length, spacer, pressure tight bushing

Defines options for device length, spacer types, and pressure-tight bushings for different models.

Electronic insert

Describes various electronic inserts (FEL51-FEL58) and their specifications for different applications.

Housing, cable entry

Details housing materials, IP ratings, and cable entry options for device installation.

Additional fittings

Lists available additional fittings such as material certifications and special approvals.

Installation

Application

Illustrates the application of the Liquiphant M for level limit detection in liquids.

Measuring System

Shows schematic diagrams for direct connection and connection via electronic inserts.

Installation

Provides detailed instructions and diagrams for the physical installation of the device.

Mounting examples as a function of liquid viscosity

Offers guidance on mounting the device based on the viscosity of the liquid being measured.

Consider buildup. Fork may not contact the buildup

Highlights considerations for buildup on the fork and proper mounting to avoid contact.

In cases of dynamic forces support

Explains how to support the device in applications with dynamic forces.

Allow clearance

Specifies the necessary clearance requirements for installation, especially with temperature spacers.

Orientation of fork tines: marking above or below

Details how to orient the fork tines correctly, indicating the marking for above or below installation.

Screw Liquiphant into process connection. DONT use housing to turn.

Instructs users to screw the Liquiphant into the process connection without using the housing for turning.

Orientation in pipes: marking in direction of flow

Explains the correct orientation of the device within pipes relative to the flow direction.

Cable entry orientation

Provides instructions on how to orient the cable entry for proper connection.

Setup

Minimum;maximum fail-safe mode

Explains how to configure the minimum and maximum fail-safe modes for the device.

Liquid density. Density ρ measured in g;cm³ (SGU) or in kg;l

Details how to set the liquid density parameter for accurate measurements.

Self test FEL57

Describes the self-test procedure for the FEL57 electronic insert.

Display elements

Explains the meaning and function of the LEDs and display elements on the device.

Connections, Function

Provides information on connecting the device and its basic functional principles.

Connections FEL51

Details the two-wire AC connection for the FEL51 electronic insert.

Function FEL51

Explains the operational function and output behavior of the FEL51 electronic insert.

Connections FEL52

Details the DC connection (PNP) for the FEL52 electronic insert.

Function FEL52

Explains the operational function and output behavior of the FEL52 electronic insert.

Connections FEL54

Details the universal connection and relay output for the FEL54 electronic insert.

Function FEL54

Explains the operational function and output behavior of the FEL54 electronic insert.

Connections FEL55

Details the 8/16 mA output connection for the FEL55 electronic insert.

Function FEL55

Explains the operational function and output behavior of the FEL55 electronic insert.

Connections FEL56

Details the NAMUR output (H-L) connection for the FEL56 electronic insert.

Function FEL56

Explains the operational function and output behavior of the FEL56 electronic insert.

Connections FEL57

Details the PFM output (150 Hz/50 Hz) connection for the FEL57 electronic insert.

Function FEL57

Explains the operational function and output behavior of the FEL57 electronic insert.

Switch-on behavior STD (Self test)

Describes the standard switch-on behavior and self-test sequence for the FEL57.

Switch-on behavior EXT (Self test)

Describes the extended switch-on behavior and self-test sequence for the FEL57.

Connections FEL58

Details the NAMUR output (H-L) connection for the FEL58 electronic insert.

Function FEL58

Explains the operational function and output behavior of the FEL58 electronic insert.

Function test button FEL58 Fail-safe mode MAX

Details the function test for FEL58 in MAX fail-safe mode, including button operations.

Function test button FEL58 Fail-safe mode MIN

Details the function test for FEL58 in MIN fail-safe mode, including button operations.

Maintenance & Cleaning

Removal of encrustation

Provides instructions on how to safely remove encrustations from the device.

Technical Data

Ambient temperature Ta Process temperature Tp

Specifies the ambient and process temperature ranges for the device.

Process pressure pe Process temperature Tp

Details the process pressure and temperature limits for the Liquiphant M and S.

Accessories

Lists available accessories, including weld-in sockets for different connections.

Lap joint flanges with BSP 1 (G1) thread; Covers with window

Describes lap joint flanges and various cover options for the device.

Sliding sleeves for unpressurized operation

Details sliding sleeves suitable for unpressurized operational use with different connections.

High pressure sliding sleeves

Describes high-pressure sliding sleeves and their materials for G1 and G1 1/2 connections.

High pressure sliding sleeves: Process pressure pe Process temperature Tp

Presents pressure and temperature limits for high-pressure sliding sleeves.

Troubleshooting

Troubleshooting Supplement

Offers a supplement with detailed troubleshooting steps for common faults and issues.

Does not switch

Lists reasons and remedies for the device not switching on or operating.

Switches incorrectly

Provides solutions for incorrect switching behavior or sporadic operation.

Spare Parts

Electronic inserts

Lists the available electronic inserts (FEL51-FEL58) as spare parts.

Housing covers, seals

Details spare parts for housing covers and seals, including material and lubrication notes.

Supplemental Documentation

Technical Information TI328 F

References technical information document TI328F and notes on safety for various certifications.