Computer-aided exhaust-gas analyzers - new options for modern measuring instruments

摘要

Exhaust-gas analyzers have evolved during approximately 20 years from stand-alone measuring instruments to complex computer-aided measuring systems, which are often connected to data networks. In order to guarantee the accuracy and reliability of measurements, even if modern cost-saving exchange concepts take place, the requirements described had to be defined. The extensive MID software requirements acted as a basis so that only a small number of additional requirements had to be defined. Meanwhile, a first measuring system based on exchangeable subassemblies was approved by the PTB. Verification officers were correspondingly advised on the new special features of the new concept and are now able to perform verifications and re-verifications. Other manufacturers have shown an interest in the realization of the new concept for their products. As many manufacturers market Europe-wide and to some extent also world-wide, it can be conceived that in other countries corresponding notified bodies are as well approached with this development. Therefore, the authors are prepared to disseminate experience gained in Germany or to perform an international exchange of experience. After the MID will have been introduced in October 2006, it remains to be seen in which way the different notified bodies will act with respect to conformity assessment for new exhaust-gas analyzers and which possibilities will arise, concerning a possible nationally required re-verification.