TruSpec Micro

Determine Carbon, Hydrogen, Nitrogen, Sulfur, and Oxygen

In solid or liquid micro samples, the TruSpec Micro provides maximum performance in determining carbon, hydrogen, nitrogen, sulphur, and oxygen. Components work together to give you dependable, consistent performance, with shorter analysis times, more robustness/less downtime, and lower maintenance costs.


  • The cost per analysis is low.
  • Supports 21 CFR Part 11 Regulations compliance.
  • 2 mg is the nominal sample mass.
  • The oxygen module uses a high-temperature (1300°C) pyrolysis furnace to give independent oxygen determination capabilities with a two-minute analysis time.

Theory of Operation

The TruSpec Micro CHN and CHNS’ efficiency and speed are due to a unique mix of a flow-through carrier gas system and individual highly selective infrared (IR) and thermal conductivity detection systems.

A weighed micro sample is loaded into the TruSpec Micro’s autoloader, which then drops the sample into the high-temperature combustion furnace, allowing it to combust. Carbon is converted to CO2, hydrogen to H2O, nitrogen to N2, and sulphur to SO2 during burning. As the combustion gases are expelled, they are swept from the furnace, through scrubbing reagents, and onto detecting equipment. Carbon, hydrogen, and sulphur are all detected simultaneously using independent IR detectors. A thermal conductivity detection method is used to test nitrogen. The full analytical cycle takes about 4 minutes to finish.

The optional micro oxygen add-on module, which is compatible with both the TruSpec Micro CHN and CHNS versions, allows the TruSpec Micro to evaluate oxygen content in organic matrices. Samples for oxygen analysis are loaded into the autoloader of the micro oxygen add-on module and dropped into a high-temperature pyrolysis furnace automatically. The CO is formed when the oxygen released during the pyrolysis of the sample reacts with the carbon-rich atmosphere in the furnace. Before being measured using an infrared detector, CO is swept from the furnace and transformed to CO2 (approximately 1 minute analysis time).