A pre-weighed sample of approximately 1 gram is combusted in a stream of oxygen using RF induction to heat the sample. Carbon and sulphur present in the sample are oxidized to CO2 and SO2 and swept by the oxygen carrier through a drying reagent and then through a NDIR cell, where sulphur is detected as SO2. The gas flow continues past a heated catalyst, where CO is converted to CO2 and SO2 is converted to SO3 which is subsequently removed by a filter. Carbon is then detected as CO2 by another NDIR cell. A pressure controller is used to maintain constant pressure in the NDIR cells so as to reduce interference from natural variations in the atmospheric pressure. The final component in the flow stream is an electronic flow sensor, which is used for diagnostic purposes to monitor the carrier flow.


       A pre weighed sample is placed in a graphite crucible which is then heated in an impulse furnace to release analyte gases. An inert gas carrier, typically Helium, sweeps the liberated analyte gases out of furnace, through a Mass Flow Controller and to a series of detectors. Oxygen present in the sample reacts with the graphite crucible to form CO and CO2 which are detected using NDIR cells. The gas then flows through a reagent heater where the CO is oxidized to form CO2 and H2 is oxidized to form H2O and detected using a set of NDIR cells. These analytes are then scrubbed out of the carrier gas stream. A patented DFC system is used to add carrier gas as a make up for the gas lost during the scrubbing process. The final component in the flow stream is a TC detector which is used to detect Nitrogen.


       A weighed micro sample is placed into the autoloader of the Truspec Micro and is automatically dropped into the high temperature combustion furnace, allowing the sample to combust. This combustion reaction converts C to CO2, H to H2O, N to N2O and S to SO2. The combustion gases are swept from the furnace, through scrubbing reagents and onto the detection systems as they are being released. Independent IR detectors are used for simultaneous detection of carbon, Hydrogen and Sulphur. Nitrogen is measured using a TC detection system. The entire analysis is complete in approximately 4 minutes. Samples being analysed for oxygen are placed into the autoloader of the micro oxygen add on module and automatically dropped into a high temperature pyrolysis furnace. The oxygen released during pyrolysis of the sample reacts with a carbon rich environment in the furnace to form CO. The CO is swept from the furnace and converted to CO2 before measurement via IR detector. Analysis time is approximately 1 minute.