LDS 6 does not contain parts subject to wear, but some parts within the sensors might be stressed. For this reason it is recommended for demanding applications to keep window modules and detector electronics on stock (quantities stated per measuring point, i.e. per sensor pair).
For the suitability of different parts (version 1 or version 2) please consult the instrument manual or contact Siemens directly. In general, all new analyzers are compatible with spare parts of version 2.