The new model DMW-... direct mass flow meter has been specially designed for use in gas measuring technology. An inexpensive analogue output is fitted. The model DMW is available in three versions: with or without integrated 31/2-digit LCD display or with a 8-digit counter. The direct stream procedure is ideally suited for measurements from 5 LN /min (max.) up to 7500 LN /min air (model: DMW-B*876). In case of small flow rates the measurements are taken with a bypass-system (DMW-A/C). In contrast with most volumetric flow meters the mass flow meter DMW-... has no moving parts, and no temperature or pressure correction is required. The meter may be installed in any position and the pressure loss is negligible. The simple mechanical construction ensures the highest degree of reliability when used with aggressive gases, and under tough industrial service conditions.