LFE gebaude raeumeAbout Us

LFE, founded in 1979, develops and manufactures specialized analytical instrumentation and components for process gas and water analysis.

Our products are known for their quality, high level of response stability and operational reliability.

Our long-standing European and worldwide customer base consists of well-known chemical and industrial plants as well as research facilities.



  • 1979
    LFE was founded in 1979 by the renowned developer Dr. Günter Schunck, who was known, among many other things, for his groundbreaking work on microflow sensors for process NDIR photometer systems. The BINOS™ system from Emerson Process Management as well as the Ultramat™ system from Siemens resulted from this work.
  • 1980
    images/timeline/TCD - erste Generation_01.jpg
    The first iteration of LFE's unique, patented TCD was introduced in 1980. It featured spatially and electronically separated heating filaments defining a new level of flexibility for the TCD principle, combining quick response and low flow-rate dependency with high corrosion resistance.
  • 1980
    images/timeline/CONTHOS 1 - Einschubgehäuse_01.jpg
    LFE's first TCD process gas analyzer series was introduced in 1980 and was in manufacture until 2000 when it was replaced by the CONTHOS 2.
  • 1980
    Originally located in Dr. Schunck's family house, by 1980 the company was hiring its first employees. The relocation to Maintal allowed controlled expansion over the coming years.
  • 1982
    images/timeline/TOC-400 _02-Edit.jpg
    LFE's first process TOC analyzer was designed in close cooperation with Hoechst chemicals located in nearby Frankfurt am Main.
    The TOC-400 utilized high temperature oxidation and featured a patented measuring principle centered around the CO2 NDIR analysis directly in the reactor exhaust at a continuous temperature of 160°C. This resulted in unsurpassed measurement stability in industrial environments.
    The original TOC-400 series was manufactured until 1995.
  • 1984
    LFE developed a the COSO series of trace gas analyzers for SO2, O3 and NOx in cooperation with the German Weather Service (Deutscher Wetterdienst).
    These analyzers utilized electrochemical cells which were highly sensitive to trace concentrations of the chosen components. The COSO series with its requirements for various chemicals was unfortunately not as attractive for customers as analyzers employing physical detectors and was therefore discontinued in 1988.
  • 1986
    LFE's backpressure controller was born out of the need for a highly accurate, electronically controllable absolute pressure controller having a wide flow dynamic range and allowing for multiple gas analyzers to be controlled simultaneously.
    This 1st generation backpressure controller was replaced by the pControl 2F in 2008.
  • 1987
    The TOC-100 was designed as a complementary product to the TOC-400. The TOC-100 allowed for much lower TOC ranges and featured an open design for easy maintenance access.
    The TOC-100 was manufactured until 1996 when it was succeeded by the TOC model 600.
  • 1990
    Our specific gravity sensor was born in the Institute of Technology in Karlsruhe. LFE was asked to take the original design and improve upon it for industrial use.
    The specific gravity sensor has required few improvements over the years and remains a part of our portfolio.
  • 1995
    images/timeline/TOC-400-II _01-Edit.jpg
    The TOC-400 II was the successor of the TOC-400. The electronics were totally redesigned for microprocessor control allowing greater overall flexibility and self-diagnosis.
    The TOC-400 / 400 II series was discontinued in 1996 and replaced by the TOC-600 which built upon the design.
  • 1997
    images/timeline/TOC-600 - open_02.jpg
    The TOC-600 succeeded both the TOC-400 and TOC-100 models, combining various features of these instruments. The analyzer had a full enclosure with a 2 dimensional component layout for easy maintenance access.
    The TOC-600 was discontinued in 2004 when it was replaced by the TOC-800.
  • 1999
    After the passing away of Dr. Schunck, his son-in-law Gary Brown stepped up into the position of managing director. Gary was intimately involved with LFE early on, performing various jobs during semester breaks until completing his graduate degree in physics. Gary has been with LFE ever since and has been involved in all aspects of the company.
  • 2000
    The CONTHOS 2 succeeded the CONTHOS 1. It offered microprocessor based electronics for greater flexibility and self-diagnostics.
    The CONTHOS 2 was replaced by the CONTHOS 3 in 2013.
  • 2005
    The TOC-800 introduced a redesigned component layout into a more compact cabinet, while maintaining excellent accessibility for maintenance. The sample feed pump(s) and sparger components were located on a wall-mounted plate for easy maintenance and flexibility.
    The microprocessor based electronics were redesigned and improved. Numerous components received higher protection against adverse environmental effects for increased long-term reliability.
    The TOC-800 was replaced by its direct successor, the TOC-810, in 2015.
  • 2005
    The USR-F self-cleaning, ultrasonic filter system was developed in order to provide a low maintenance filter system for online water analyzers.
  • 2007
    The ultrasound module of the filter system USR-F was modified to accept up to 3 process liquid analytical sensors.
  • 2008
    The pControl 2F is a redesign of its predecessor. It now offers flexible microprocessor control including self-diagnosis and is presented in a wall-mounted, purgable enclosure.
  • 2011
    In March 2011 LFE relocated to its new, modern facility in the city of Bruchköbel, just to the northeast of Frankfurt am Main.
  • 2013
    The CONTHOS 3 replaces its predecessor with completely redesigned electronics. The redesign includes comprehensive self-diagnostics and makes full use of numerous improvements made in LFE's unique thermal conductivity detector over the years.
  • 2014
    The CONTHOS 3 platform was modified to operate with a paramagnetic oxygen detector.
  • 2014
    The TOC-810 is the direct replacement of the TOC-800. The basic instrument design remained unchanged, whereas the electronics were completely redesigned providing higher flexibility and significantly more comprehensive self-diagnostics.
  • 2015
    The Series 54 peristaltic pump was born out of the need for a more flexible sample feed pump for use with our TOC analyzer systems. Customer feedback at the time motivated us to add features, such as remote control, to the pump allowing flexible integration into various other process analytical scenarios
  • 2018
    LFE now offers its unique TCD as an OEM product for integration in process gas analyzers. The microprocessor controlled signal processor provides the necessary signal output as well as self-diagnosis features.
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