Low energy, low temperature liquid source evaporation

Many industries require a liquid source to be converted into a homogeneous vapour.

Traditional methods have involved either bubbling a carrier gas through the liquid source while precisely controlling the temperature and pressure, or directly introducing the liquid source onto a hot surface or plate.

The former is extremely reliable, well-proven and offers high repeatability/reproducibility once the controlled process parameters have reached steady state.

It is, however, less suited to applications where step changes in concentration are required, where fast switching on-off is required or where multiple liquid sources need to be introduced through one, single evaporation system.

Furthermore, this system requires a large volume of potentially hazardous liquid to be housed in a pressurised (glass) container close to the application – often not ideal in highly populated laboratories.

The latter has benefits as a highly simplified system however the temperature required for evaporation is much higher, the energy consumption is extremely high and variable control of flow rate/concentration can only be achieved on long cycle times.

Bronkhorst has overcome these short-falls with a pre-engineered, low temperature, low energy consumption evaporation system that is ideal for variable flow rates, variable concentration, fast switching and multiple liquid sources.

Bronkhorst’s Vapour Delivery Modules (VDM) are leading the way in vapour generation and control as a pre-assembled easy to use, plug and play, format.

Simply connect the gas and liquid and power to the unit and all is ready.

The flow rates and heater temperature can then be set by using the easy to use OLED local display and control screen and the unit is working. 

A useful benefit is that the VDM also has pre-existing electrical sockets for both a Trace Heated Line and a PT 100 thermocouple thereby simplifying the engineering, and control, of a uniform temperature after the outlet.

The addition of trace heating can be useful when components of the vapour are prone to drop out of the vapour phase or where extremely low flow rates or pressures are involved.

At the very heart of the VDM is the Controlled Evaporator Mixer (CEM) System supplied by Bronkhorst for many years.

However, recent innovations in both liquid and gas control have further extended the capability and areas of use and these improvements have been incorporated into the VDM design.

For more information please contact: www.bronkhorst.co.uk