The PSC Controlled Evaporation System is a vapor generation system that is capable of generating low flow vapor streams. This system is an alternative to traditional bubbler systems and provides a highly precise and controllable vapor generation process in ready-to-use/out-the-box or customizable packages, which includes:
Our fully integrated packages come prebuilt or they can be custom designed to fit your exact project requirements. Our packages arrive assembled and ready for use and are backed by our technical support team.
The low flow capabilities of our CEM Controller makes for an easy, all-in-one vapor generation system. So this controlled evaporation system is an especially useful device for laboratories, research purposes, and intricate manufacturing processes. Common applications include precise batching of additives in food and beverage manufacturing and chemical vapor deposition (CVD) processes.
Our original design for a controlled evaporation system includes a table top controller, allowing users to easily move and store the vapor generator when not in use. A rack mounted vapor generation system is now available, which is a perfect fit for research laboratories, universities, and more. Both systems contain a user-friendly, HMI touchscreen interface that’s preprogrammed to allow users to easily adjust settings such as flow rates, temperature, and concentration / composition of the vapor stream. Input / Output is conveniently located on the control unit to allow users to easily connect various flow meters and flow controllers, change carrier gas, and liquids to be vaporized.
The rack mounted system is ideal for laboratory environments and offers easy control with built-in standard functions, allowing researchers and other users to stop/start, change set points, and adjust flow rates with ease. Additionally, the rack mounted CEM Controller can control up to three different vapor generation systems via three separate controlled evaporator mixers and supplemental flow controllers for gases and liquids. The CEM Controller can operate each of the three systems separately or it can control them as part of a single system.
The CEM Controller offers highly accurate, repeatable, and efficient vapor generation and analytical tracking. Traditionally, bubbler systems are often not capable of handling sufficient quantities of liquid with a low vapor pressure, or perform in an imperfect way. Moreover, they cannot instantaneously provide vapor of a mixture of liquids with different vapor pressures.
The CEM Controller is a modular setup with the Controlled Evaporative Mixer (CEM) itself as the core component. A CEM is a mixer and vaporizer that uses heat to atomize a liquid, which is then mixed with a carrier gas. The carrier gas and liquid mixture is then heated and transformed into vapor phase, which can then be used for precise, low flow vapor control. And to feed the CEM with liquid and gas, the CEM is setup with a liquid flow meter with a control function and a gas flow controller. The liquid meter uses the mixing valve of the CEM to control the liquid flow rate.
The gas serves as a mixing component and as a means of transport for the vapor and is therefore known as ‘carrier gas’. The mixing valve atomizes the liquid and adds it to the carrier gas, creating an aerosol, which is heated by the CEM until it transforms into a vapor. To monitor the internal temperature of the heat exchanger, the CEM incorporates a PT100 temperature sensor. And an internal safety switch prevents overheating of the heat exchanger, by interrupting the control signal as soon as the temperature reaches 392˚F.
To control the liquid and gas supply flows and the CEM temperature, the CEM Controller integrates the required flow instrumentation with an HMI touchscreen controller with GUI read-out that also serves as a power supply unit. The controller comes equipped with Modbus interface programmed for the CEM system. Also, the CEM Controller contains a temperature controller for the heat exchanger and provides a user interface to operate the instrumentation. Additionally, the HMI controller provides data logging of instrument data and WebMI capabilities. The WebMI empowers users to control everything onscreen from a computer, tablet, or other mobile devices.
The choice of gas flow controller depends on the specific requirements of the application. The gas flow controller is used to supply carrier gas to the CEM for the vaporization of the desired liquid. Common choices include thermal mass flow meters such as the EL-FLOW Prestige or IN-FLOW for higher flow rates or Coriolis based flow meters such as the mini CORI-FLOW. Our engineers will work with you to help determine which Bronkhorst flow meter will work best for your process.
The choice of liquid flow meter and controller is typically a mini CORI-FLOW since this instrument offers unmatched precision and functional capability. Additionally, the mini CORI-FLOW can handle a wide range of liquids of various viscosities and corrosive properties. This device is used to precisely supply the CEM with liquid for the vaporization process. However, other flow instrumentation may be chosen depending on the specific requirements of the user and application.
The CEM is the heart of the controlled evaporation system. This device is equipped with an atomizer, which is used to vaporize the liquid, which is then mixed with the carrier gas in the mixing chamber.
| Evaporator Mixer |
CEM Series 100W, for LIQUI-FLOW |
| Inlet Liquid | 1/4” OD Compression Type |
| Inlet Gas | 1/4” OD Compression Type |
| Outlet Vapor | 1/4” OD Compression Type |
| Seals | Kalrez |
| Power Supply | 42Vac |
Our Vapor Generation Controller generally features a 7” color touchscreen for an indication of measured values. Additionally, the HMI unit offers user friendly process control and comes preprogrammed with high functionalities specifically for vapor generation processes. The touchscreen easily enables the user to change the setpoints and other functions. Also, the controller powers the devices and communicates via Modbus to control the CEM temperature and the instruments’ flow rates. And, the controller offers a temperature traced vapor outlet and the option for additional gas or liquid instruments.
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