Thermo Scientific™

Continuous Emissions Monitoring System for Total Reduced Sulfur

 Related applications:

Measure total reduced sulfur (TRS) using field-proven, pulsed fluorescence technology with Thermo Scientific™ Continuous Emissions Monitoring Systems (CEMS). 
Designed to meet the needs of the pulp and paper industry in complying with the regulatory requirements of 40 CFR part 60 as set forth by the U.S. EPA.

Error loading your content!

  Catalog number Price ({{currency}}) Availability Qty
also known as {{product.formattedSku}} 
{{product.availability.message}} Add To Cart

{{addItemToList.successMessage}} {{addItemToList.listName}}

Back to top


In order to measure TRS in accordance with the federal regulations, the sample must be measured on a dry basis and be corrected to a fixed Oxygen (O2) content. This is accomplished by extracting the sample from the process using the Thermo Scientific PRO902C Low-Flow Dilution Probe.

First, the sample is passed through a water removal device to provide a dry sample. The oxygen content is measured and the sample is diluted to an appropriate level, depending on the site conditions.

The diluted sample is sent through a sample line to the instrument cabinet and passes through a selective scrubber where Sulfur Dioxide (SO2) is removed and TRS is allowed to pass. Next, the sample is routed to a thermal oxidizer where the TRS compounds react with O2 under high temperature, and is then sent on to the Model 43i Pulsed Fluorescent SO2 analyzer.

Key Features:

  • Designed to meet U.S. EPA 40 CFR Part 60 requirements
  • Dry-basis measurement
  • Reliable pulsed-fluorescence technology
  • Corrective oxygen measurement

Recommended for:

Pulp and Paper Mills

User services

Order status 
Review your order status.

Service offerings
Overview of all services including support plan options, repairs and calibrations, spare parts and technical training.

Factory Depot 
Request an RMA number and send your instrument to our factory for repair.


Manuals & protocols