CEM & VDM Systems

Bronkhorst has developed a unique sysstem to realise Mass Flow Control of Vapour: the CEM-system."CEM" stands for Controlled Evaporaton and Mixing. In plastices and rubber applications the CEM-system is reliable and flexible means for applying a water repellent layer to fabrics, a scratchproof coating on automotive parts or the lamination of tubes for toothpaste, cosmetics or food products.

The CEM-system is built up from a Mass Flow Meter for liquid, a Mass flow Controller for the carries gas and a mixing chamber in which a liquid flow is inject in the carrier gas flow. Subsequently the mixture is led into a temperature-controlled heating device, which results in complete evaporation. The system is completd by a Power Supply Readout Unit with flow indication and set-point facility. This way of vapour source control is very accurate, reliable and fast, becasue the amount of liquid and gas is measure and controlled using thermal Mass Flow Controllers. The system can be applied for atmospheric as well as pressurized systems. There are three series(10,100 and 1000 Watt), covering liquid ranges up to 1200g/h of water or 1700g/h of Methanol.

Based on the CEM-technology as described above, Bronkhorst designed a new series of Vapor Delivery Modules. These compact sub-systems incorporate the componets of the CEM-System and more ! Besides gas and liquid flow controllers and the temperature controlled evaporator, the VDM-Series feature integrated power supply with display(1.8''TFT) and control functions. As an option, the unit offers local or remote trace heating temperature control. The compact, "plug and work" module can generate(saturated) vapor flows within the range of 100ml_n/min up to 10 l_n/min. It can be applied for atmospheric or vacuum processes and is capable of evaporating mixtures and even solids, dissolved in solvents.