Endress+Hauser Liquiphant M FTL51 User Manual

BA213F/24/ae/03.06
52005008
Operating Instructions
Liquiphant M FTL50, FTL51
Level Limit Switch

Endress+Hauser Liquiphant M FTL51 Specifications

General

Measuring Principle	Vibrating fork
Process Temperature	-50°C to +150°C (-58°F to +302°F)
Ingress Protection	IP66/IP67
Type	Vibrating fork level switch
Application	Liquids
Process Pressure	-1 to +100 bar (-14.5 to +1450 psi)
Density Range	≥0.5 g/cm³
Output	Relay, NAMUR, PNP
Housing Material	Aluminum, stainless steel
Wetted Materials	316L
Power Supply	20 to 253 V AC
Approvals	ATEX, IECEx, FM, CSA, NEPSI
Communication	HART
Electrical Connection	M20 x 1.5 cable gland or 1/2" NPT conduit
Process Connection	Thread, Flange, Hygienic connections

Summary

Safety Instructions

Safety Pictograms and Symbols

Explains safety hints and warnings highlighted by symbols such as Caution, Note, Hazardous area, and Non-hazardous area.

Order Codes

Electronic Insert

Lists available electronic inserts (e.g., FEL51, FEL52, FEL54) with their specifications and functions.

Installation

Installation

Consider Buildup. Fork May Not Contact the Buildup

Setup

Minimum/Maximum Fail-Safe Mode

Explains how to set the minimum or maximum fail-safe mode for the level limit switch.

Liquid Density

Self Test FEL57

Details the self-test procedure for the FEL57 electronic insert, including standard and corrosion tests.

Connections FEL51

Function FEL51

Connections FEL52

Function FEL52

Connections FEL54

Function FEL54

Connections FEL55

Details the 8/16 mA output connections for the FEL55 electronic insert, including hazardous area considerations.

Function FEL55

Explains the operational functions of the FEL55 insert, showing LED indicators for 8/16 mA output.

Connections FEL56

Details the NAMUR output (H-L, <1.0 mA / >2.2 mA) connections for the FEL56 electronic insert.

Function FEL56

Explains the operational functions of the FEL56 insert, showing LED indicators for NAMUR output.

Connections FEL57

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

Function FEL57

Explains the operational functions of the FEL57 insert, showing LED indicators for PFM output.

Switch-on Behavior STD (Self Test)

Switch-on Behavior EXT (Self Test)

Connections FEL58

Details the NAMUR output (H-L, >2.2 mA / <1.0 mA) connections for the FEL58 electronic insert.

Function FEL58

Explains the operational functions of the FEL58 insert, showing LED indicators for NAMUR output.

Function Test Button FEL58 Fail-Safe Mode MAX

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

Function Test Button FEL58 Fail-Safe Mode MIN

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

Technical Data

Ambient Temperature Ta Process Temperature Tp

Process Pressure pe Process Temperature Tp

Troubleshooting

Does Not Switch

Lists reasons and remedies for the device failing to switch, such as power issues or faulty connections.

Switches Incorrectly

Details causes and solutions for incorrect switching behavior, including settings and environmental factors.

Sporadic Faulty Switching

Addresses intermittent switching problems, suggesting solutions like shielding, dampening, or checking connections.

Switches Incorrectly After Power Failure

Covers issues where the device switches incorrectly after a power interruption, like output overload or test behavior.