As one of the world’s leading manufacturers of total organic carbon (TOC) analyzers and analytical instruments, we provide superior technology, design, quality, and service. We have acquired more than 30 patents for technical innovations— including the Sievers Membrane Conductometric Method and the Integrated On-Line Sampling (iOS) System. Sievers TOC Analyzers cover a dynamic analytical range from 0.03 ppb up to 50,000 ppm and provide solutions across diverse industries and applications. Beyond instrumentation you can trust, Sievers certified services, reference materials and vials, and application expertise are unmatched


Total Organic Carbon (TOC) analyzers perform two functions: they oxidize the organic carbon in a sample to COand measure the COproduced. What makes TOC analyzers different is the method they use to oxidize the organics and the methods used to detect the resulting CO2.

The three main methods of COdetection used commercially are:

  1. Non-dispersive infrared (NDIR)
  2. Direct Conductometric (Non-selective Conductometric)
  3. Membrane Conductometric Detection (Selective Conductometric)

NDIR TOC detectors measure CO2 in the gaseous phase, while conductometric TOC detectors measure CO2 in the liquid phase.


Total Organic Carbon (TOC) is an indirect measure of organic molecules present in a sample and measured as carbon. TOC measurement includes oxidizing organic carbon, detecting the oxidized carbon (often detected as CO2 by conductivity or NDIR), and expressing the result as carbon concentration.


TOC is widely used to assess the purity of water in industries such as pharmaceuticals, microelectronics, municipal water treatment, and wastewater. In some industries, TOC is measured to comply with regulatory requirements. TOC can also be used for process understanding, cleaning validation and verification, leak detection, and other applications.

In municipal drinking water plants, TOC analysis is performed to ensure sufficient levels of TOC are removed from source water so that water is safe to drink. Organics monitoring is a valuable tool used in all stages of the water treatment process for treatment optimization, quality control, and regulatory compliance. Understanding and optimizing the various separation processes in drinking water treatment are important to detect changes in source water, reduce operating costs, and minimize the formation of disinfection byproducts (DBPs).

Microelectronics manufacturers monitor TOC in their process water, as TOC can cause imperfections in the way that silicon wafers and circuit boards are printed. This impacts the quality of their product.

Pharmaceutical manufacturers use TOC monitoring to measure purified water and water for injection (WFI) for compliance to USP <643>, EP 2.2.44, JP, IP, ChP and other harmonized compendia. For more robust monitoring programs, online technology is deployed to monitor water purification loops in real time for process control and immediate detection of out-of-specification (OOS) or out-of-trend (OOT) results. Immediate detection limits impact to critical equipment and in-process batches, saving time and reducing costs.

TOC is also a valuable tool for cleaning validation, verification, and monitoring. In cleaning validation, TOC is used to confirm removal of active pharmaceutical ingredient (API), detergents, cleaning agents, excipients, and degradants from equipment. This confirmation of cleanliness is used to release equipment without risk of carryover. Sievers TOC Analyzers can easily integrate directly online with a Clean-in-Place (CIP) skid to provide real-time, validated data with the highest degree of data integrity, process understanding, and process control. Sievers TOC Analyzers deliver results in compliance with 21 CFR Part 11 data management and data integrity guidelines.

The pharmaceutical industry demands lean processes and continuous improvement also known as “Quality by Design” (QbD). Having efficient processes allows for safe, high quality products to be available to patients when needed. The US FDA’s guidance document on Process Analytical Technology (PAT) not only describes how and when to deploy technology, it also strongly encourages manufacturers to embrace PAT within their systems. Total organic carbon (TOC) and conductivity monitoring are crucial aspects of purified water system quality and control. Real time data from process analytical technology ensures a controlled and well understood process while saving sampling and analysis time.


Ghulam Muhammad Sons(GMS) is now officially the EXCLUSIVE partner/distributor of Suez – Sievers TOC Analyzers for all Pakistan. For more information please feel free to contact us. 

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