TOC-800
Process TOC Analyzer

Features

• continuous analysis with high carbon conversion level (at up to 1100°C):
  Only the high-temperature combustion method guarantees the nearly complete conversion of all organic carbon-compounds for the subsequent CO₂-analysis.
• extraordinarily stable measuring qualities:
  High demands are placed on the stability of the system-components. For this reason, LFE developed a low-maintenance, high-precision metering pump for its on-line TOC-analyzers.
  LFE's modified version of the BINOS^® NDIR-photometer system is ideally suited because of it's excellent long-term stability and flexibility.
• increased reliability:
  Increased long term reliability is obtained through the enclosure of all electronic components, protecting them from adverse environments.
  Separate cabinets for the analytical and the electronic components: The upper cabinet containing the NDIR-photometer as well as the majority of electrical components is purgable.
  
• improved handling:
  Maintenance and servicing of the instrument is facilitated through even better accessibility and handling.
• outstanding reactor service-life:
  The dimensioning of the analytical parameters allows maximum possible reactor service-life in combination with the fastest possible response time.
• special detailed solutions:
  The wetted components of the TOC-800 are composed of corrosion-resistant materials such as aluminum-oxide, glass and PTFE/PVDF.
  The IR-photometer is fitted with an analysis cell specially developed by LFE. This cell is constructed out of glass with specially bonded sapphire windows. The extreme long-term stability of the NDIR-photometer is further enhanced by a patented gain controller.
• intuitive User-Interface:
  The TOC-800 is amazingly simple to operate despite its inherent complexity. The intuitive operation of the instrument is supported by a user-interface structure recommended by the NAMUR^[1] commission.
• automatic self-monitoring:
  A wide range of system functions are continuously monitored. The intelligent self-monitoring places system failures into either of two categories: "maintenance required" or "instrument fault". The system status is available as floating relay-contacts and is displayed on the LC-display in plain text for easy diagnosis.
• signal & status read-out:
  The TOC-800 provides 4 individually-configurable, isolated 0(4)-20mA analog outputs. The available ranges (depending on instrument configuration) or even peripheral system values (e.g. reactor pressure) can be distributed over the 4 outputs.
  In addition various status signals are available via the digital interface. The instrument status, among other things can be read out using the 3 floating contacts provided for this purpose. The contacts provide the following general information (according to NAMUR ^[1] recommendation): Instrument fault / Maintenance required / Maintenance

Options

• Acidifier/ Sparger/ Multiplexer-unit (ASM-unit; wall mounted)
  The basic TOC-800 instrument functions as a TC-analyzer.
  The ASM-unit facilitates the removal of inorganically bound carbon (TIC).
  This unit can be equipped with further options:
  - automatic calibration for 3 test solutions (1x zero level + 2x span solutions)
  - Multiplex capability (3 sample streams)
  - Dilution stage (max. dilution factor: 6)
• simultaneous, selective VOC- or TIC- analysis
  in conjunction with 2^nd NDIR measuring channel and the Acidifier/ Sparger/ Multiplexer-unit
• RS-232 serial interface
• built-in line recorder or data logger

VOC Analysis Package (optional)

Background

Aside from the intentional removal of inorganically bound carbon (TIC) the sparger air can also inadvertently expel volatile organic carbon (VOC) compounds which escape detection.

The TOC-800 can be fitted with an optional package in conjunction with a 2^nd photometer channel which simultaneously and continuously measures the VOC-level independent of the TOC- (or DOC-) analysis.

Functional Principle

The potentially VOC enriched sparger air is split into two parallel gas streams each containing a CO₂ background level representative of the TIC level of the water sample as well as possible VOC.

• The 1^st gas stream is passed unaltered through the reference cell of the differential CO₂ photometer channel.
• The 2^nd gas stream is passed through a catalytic converter stage in which any VOC is oxidized to CO₂ and added to the background CO₂ level. This stream is sent to the sample side of the differential CO₂ photometer.

The difference in IR radiation absorption in the photometer channel corresponds to the VOC concentration of the water sample.

The inherent response of a differential NDIR photometer to varying background levels is dynamically corrected for by the implementation of LFE's patented gain stabilization / common mode rejection algorithm. This is made possible by the use of a specially modified BINOS^® photometer system (Emerson Process). First introduced by LFE in 1989, this unique method totally eliminates the need for a CO₂ scrubber. The resultant maintenance requirements for the VOC analysis are minimal.

Technical Data

Downloads

The following documents are currently available for download in Adobe^® PDF-format or in Microsoft^® Word format:

Product / Document type	Language		File name	File format	File size
	English	German
TOC-800 - Online TOC-Analyzer
Application questionnaire			21_appq_en.doc		165 KB
Brochure			21_info_en.pdf		139 KB
General information
Brochure			LFE_info_overview_en.pdf		118 KB