Zero air instruments are widely used, for example like zero reference for any instrument that measures hydrocarbon concentration or source of fuel air for FID. The LZA series is one of the most compact and efﬁcient hydrocarbon-free air puriﬁer systems for laboratory use. The reliable and efﬁcient “heated catalyst technology” is in use to reduce the emission of THC and methane to less than 0.05 ppm. The LZA series increases the efﬁciency of any laboratory by avoiding the need of high-pressure gas cylinders. The LZA generators allow the production of in- house puriﬁed air in a simple and inexpensive way.