Graphite heater heating principle

Samples are quantitatively injected into a graphite tube using a syringe, with the graphite tube serving as a resistive heating element. Upon applying power, it rapidly heats up, achieving the atomization of the sample. Graphite heaterIt consists of a heating power supply, a protective gas control system, and a graphite tubular furnace.

External power is applied to both ends of the graphite tube.Graphite Heater ManufacturerEnergy is supplied to the atomizer, and the current passing through the graphite tube generates temperatures up to 3000°C, transforming the measured element into a ground-state atomic vapor within the graphite tube.

The Protective Gas Control System manages the flow of protective gas. Upon instrument activation, the Ar gas is circulated for the burn-out phase, after which the Ar gas flow is cut off. The Ar gas in the external gas path flows along the outer wall of the graphite tube to prevent erosion. The Ar gas in the internal path flows from both ends of the tube towards the center, exiting through the tube holes to effectively remove matrix vapors generated during the drying and ashing process, while also protecting atomized atoms from oxidation.

At the atomization stage, discontinue gas flow to extend the average residence time of atoms within the absorption zone, and to prevent dilution of the atomic vapor.

Please provide the Chinese content you would like translated into American English.Graphite Heater PriceIn the atomization system, the flame is replaced by an electrically heated graphite tube in an argon atmosphere. Argon prevents the rapid oxidation of the graphite tube at high temperatures and removes the matrix components and other interfering substances from the optical path during the drying and ashing stages. A small amount of sample (1 to 70 mL, usually around 20 mL) is added to the pyrolytic coated graphite tube. The pyrolytic coating on the graphite tube effectively prevents oxidation, thereby extending the service life of the tube. Additionally, the coating prevents the sample from infiltrating the graphite tube, thus enhancing sensitivity and reproducibility. Graphite Heater

Graphite tubes are heated by an electric current, the magnitude of which is controlled by a programmable control circuit. This allows the sample within the graphite tube to be heated in a series of temperature increments during the heating process. The objective is to remove solvents and most matrix components, followed by atomization of the sample to produce ground-state free atoms. The degree of molecular decomposition depends on factors such as the atomization temperature, heating rate, and the surrounding environment of the heated graphite tube wall.