Serviceline Industrial Sensors
Serviceline Explosion Protection

Guided Level Radar LTC51

  • Premium device for level measurement in liquids
  • Measuring range up to 45 m (148 foot)
  • Process connection from 3/4 inch thread or flange
  • Temperature range up to 200 °C (392 °F)
  • Pressure range up to 40 bar (600 psi)
  • Up to SIL 3 acc. to IEC/EN 61508

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  LTC51

General specifications
Measuring methodThe device is a measuring system that functions according to the time-of-flight method. The distance from the reference point (process connection of the measuring device) to the product surface is measured.
Construction typedevice with rod probe
device with coax probe
device with rope probe
Functional safety related parameters
Safety Integrity Level (SIL)SIL 3
Rated voltage11.5 ... 35 V DC, 2-wire
10.4 ... 48 V DC, 4-wire
90 ... 253 V AC, 50/60 Hz
Measured variabledistance between reference point and product surface
Measurement rangerod probe: 4 m/10 m (13 ft/33 ft) (for divisible/indivisible rod probes)
coax probe: 6 m (20 ft)
rope probe: 45 m (148 ft)
Output signal4 ... 20 mA
2 x 4 ... 20 mA
Communication4 ... 20 mA HART (standard)
PROFIBUS PA (option)
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EUEN 61326-1:2006 , EN 61326-2-3:2006
Low voltage
Directive 2014/35/EUEN 61010-1:2010
Degree of protectionIEC 60529:2001
Measurement accuracy
- measuring range up to 15 m (49 feet): ±2 mm (0.08 inch)
- measuring range > 15 m (49 feet): ±10 mm (0.39 inch)
analog: 0.02 %
sum of non-linearity, non-repeatability and hysteresis included in the maximum measured error
Operating conditions
Process conditions
Process temperature-40 ... 200 °C (-40 ... 392 °F)
Process pressure (static pressure)-1 ... 40 bar (-14.5 ... 580.2 psi)
Dielectric constantrod probe: DC ≥ 1.6
coax probe: DC ≥ 1.4
rope probe: DC ≥ 1.6
Ambient conditions
Ambient temperature-40 ... 80 °C (-40 ... 176 °F)
Mechanical specifications
Degree of protectionIP68, NEMA 6P (24 hours in water 1.83 m (6 ft) deep)
Connectiongland M20
thread M20, G1/2, NPT1/2
device plug M12, 7/8 in
Materialmaterials in contact with process :
rod probe, coax probe: 1.4404/316L
rope probe: 1.4401/316
process connections: 1.4404/316L, 2.4602/Alloy C22
process membran, seal: Viton, EPDM, Kalrez, gas-tight feed through as option
Process connectionthreads: from 3/4 in
flanges: DIN EN from DN40, ANSI from 1-1/2 in, JIS from DN40
Data for application in connection with hazardous areas
EU-type examination certificatesee instruction manuals (SI)
Directive conformity
Directive 2014/34/EUEN 60079-0:2012+A11:2013 , EN 60079-1:2007 , EN 60079-11:2012 , EN 60079-15:2010 , EN 60079-26:2007 , EN 60079-31:2009
International approvals
IECEx approvalsee instruction manuals (SI)
Certificates and approvals
Overspill protectionsee approval (ZE)
Telecommunicationsradio license FCC
General information
Supplementary documentationtechnical information (TI)
manuals, brief instructions (BA, KA)
instruction manuals (SI)
approval (ZE)
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see
Designationsee technical information (TI)


ECLASS 13.027200513
ECLASS 12.027200513
ECLASS 11.027200513
ECLASS 10.0.127200513
ECLASS 9.027200513
ECLASS 8.027200513
ECLASS 5.127200513
ETIM 9.0EC002995
ETIM 8.0EC002995
ETIM 7.0EC002995
ETIM 6.0EC002995
ETIM 5.0EC001447
UNSPSC 12.141111950

Details: LTC51


The device offers the following benefits:

  • Reliable measurement even for changing product and process conditions

  • HistoROM data management for easy commissioning, maintenance and diagnostics

  • Highest reliability due to Multi-Echo tracking

  • Seamless integration into control or asset management systems

  • Intuitive user interface in national languages

  • Approvals: ATEX, IECEx

The following interfaces are available for system integration:

  • HART with 4 mA ... 20 mA analog (standard)

  • PROFIBUS PA (option)

Informative Literature: LTC51

Language Selection:
LiteratureLanguageFile TypeFile Size
Application Report - Reliable Level Measurement with Explosion ProtectionENGPDF214 KB

Product Documentation: LTC51

Language Selection:
Product informationLanguageFile TypeFile Size
TI01001O, Technical Information LTC51ENGPDF5101 KB
Brief Instructions
KA1077O, brief instructions LTC51 HARTENGPDF1958 KB
KA1079O, brief instructions LTC51 PROFIBUS PAENGPDF1617 KB
Safety and Security Documentation
SI00496O, Instruction manual LTC50, LTC51, LTC57ENGPDF1164 KB
SI00497O, Instruction manual LTC51ENGPDF1062 KB
SD00326O, Functional Safety Manual LTC5XENGPDF3235 KB
SI00498O, Instruction manual LTC50, LTC51, LTC57ENGPDF1249 KB
SI00499O, Instruction manual LTC50, LTC51ENGPDF1140 KB
SI00500O, Instruction maunal LTC50, LTC51ENGPDF1475 KB
SI00502O, Instruction manual LTC50, LTC51, LTC57ENGPDF1281 KB
SI00503O, Instruction manual LTC50, LTC51, LTC57ENGPDF1230 KB
SI00516O, Instruction manual LTC50, LTC51, LTC57ENGPDF1299 KB
SI00517O, Instruction manual LTC51ENGPDF1187 KB
SI00518O, Instruction manual LTC50, LTC51, LTC57ENGPDF1550 KB
SI00519O, Instruction manual LTC50, LTC51ENGPDF1152 KB
SI00520O, Instruction manual LTC50, LTC51ENGPDF1527 KB
SI00522O, Instruction manual LTC50, LTC51, LTC57ENGPDF1180 KB
SI00523O, Instruction manual LTC50, LTC51, LTC57ENGPDF1168 KB
SI00529O, Instruction manual LTC50, LTC51, LTC57ENGPDF881 KB
SI00530O, Instruction manual LTC50, LTC51, LTC57ENGPDF1094 KB
SI00531O, Instruction manual LTC50, LTC51, LTC57ENGPDF1093 KB
SI00532O, Instruction manual LTC50, LTC51, LTC57ENGPDF875 KB
SI00570O, Instruction manual LTC50, LTC51, LTC57ENGPDF623 KB
SI00571O, Instruction manual LTC50, LTC51, LTC57ENGPDF842 KB
SI00572O,Instruction manual LTC50, LTC51, LTC57ENGPDF626 KB
SI00573O,Instruction manual LTC50, LTC51, LTC57ENGPDF841 KB
SI01125O, Instruction manual LTC50, LTC51, LTC57ENGPDF1261 KB
SI01126O, Instruction manual LTC50, LTC51, LTC57ENGPDF1258 KB
SI01127O, Instruction manual LTC51ENGPDF1144 KB
SI01128O, Instruction manual LTC51ENGPDF1152 KB
SI01130O, Instruction manual LTC50, LTC51, LTC57ENGPDF1386 KB
SI01131O, Instruction manual LTC50, LTC51, LTC57ENGPDF1382 KB
SI01132O, Instruction manual LTC50, LTC51, LTC57ENGPDF1253 KB
SI01133O, Instruction manual LTC50, LTC51ENGPDF1383 KB
SI01134O, Instruction manual LTC50, LTC51ENGPDF1543 KB
SI01135O, Instruction manual LTC50, LTC51ENGPDF1372 KB
SI01136O, Instruction manual LTC50, LTC51, LTC57ENGPDF1305 KB
BA1001O, Manual LTC51 HARTENGPDF3925 KB

Design / Simulation: LTC51

Language Selection:
CADLanguageFile TypeFile Size
CAD 3-D additional / CAD 3-D additionalALLSTP1782 KB
CAD Portal / CAD PortalALLLINK---

Approvals: LTC51

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
Canada FMFM 16 CA 0206XALLPDF205 KB
Canada, USACoC 70105058 CUSALLPDF99 KB
Europe KEMA Ex ic ATEX Ex ta Ex iaDEKRA 14 ATEX 0117XALLPDF419 KB
Europe Pepperl+Fuchs ATEX Category 3 G Certificate of CompliancePF15CERT3612XALLPDF301 KB
Europe Pepperl+Fuchs ATEX Category 3 G Certificate of CompliancePF15CERT3604XALLPDF197 KB
Europe Pepperl+Fuchs ATEX Category 3 G Certificate of CompliancePF15CERT3605XALLPDF297 KB
KEMA IECEx Certificate of ConformityIECEx DEK 14.0066XALLLINK---
Declaration of Conformity
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-0091CALLPDF136 KB
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-1936BALLPDF92 KB
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-1937BALLPDF91 KB
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-1941BALLPDF126 KB
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-1939BALLPDF130 KB
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-1940BALLPDF124 KB
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-1938CALLPDF135 KB
Contamination Declaration
Contamination declaration / Kontaminationserklärung   ALLPDF137 KB

Associated Products: LTC51

Universal DTM host platform, For all DTMs of Pepperl+Fuchs, Approved FDT/DTM technology, Free of charge, Download from Pepperl+Fuchs websitepa
Device DTM, For level devices, Frame application, like e. g. PACTware, must be installed separatelypa
Functional Safety Hub from Pepperl+Fuchs

Several hundred products with a SIL/PL assessment, free tools, and brochures in one place: the "Functional Safety Hub" is your starting point when you have to implement safety functions.