Of vital importance in the manufacture of florescent bulbs is the verification of gas pressure and gas type inside the lamp. The correct gas filling of the gas piston is essential. Incomplete filling or the presence of harmful residual or purge gases affects the quality of the product with respect to its photometric values and time of service. Conventional techniques require the destruction of the sample, meaning that testing is only possible on a spot sampling basis. GNT systems use plasma technology to test 100% of the samples at high speed, without causing any damage to the product.
Gas types and gas mixture can be analysed by the spectrum of colours that they emit during plasma formation. This allows carrier gases to be detected quickly and reliable. For example, hydrogen can be identified by its noticeably red plasma.