PSC Vapor Flow Controller, CEM Control Unit

• HMI 7″ color touchscreen controller pre-programmed for easy use
• Bronkhorst: CEM, gas and liquid flow meters and controllers
• internal temperature safety switch
• power supply
• Modbus interface
• user interface for unit operation
• data logging and WebMI capabilities
• computer, phone, or tablet access

Applications

The low flow capabilities of our CEM Controller makes this an especially useful device for laboratories and research purposes in addition to intricate manufacturing processes such as the additives in food and beverage manufacturing, or chemical vapor deposition of coatings for tools (drills, screwdrivers, saw blades, etc.) and machine parts to improve their wear resistance using CEM technology.

• analyzers with reference gas vapor concentrations toxic gas
• effects on protective clothing
• analyzers with reference H2O vapor concentrations
• anesthetics
• humidification of fuel cells
• crystal breeding installations
• dosage of additives, e.g. perfume, vitamins, etc.
• semiconductor and solar cell manufacturing for electric and dielectric (insulating) layer deposition

Advantages over Traditional Bubbler Systems

The CEM Controller offers highly accurate, repeatable, and efficient liquid dosing and analytical tracking. Traditional 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.

CEM Controller for Vapor Flow Control

Precise Vapor Deposition

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. 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.

Controlled Evaporative Mixer Technology

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. An internal safety switch prevents overheating of the heat exchanger, by interrupting the control signal as soon as the temperature reaches 392˚F. 

All-in-One Vapor Deposition Device

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. The CEM Controller also contains a temperature controller for the heat exchanger and provides a user interface to operate the instrumentation. The HMI controller also 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. 

Ready-to-Use / Out-the-Box Packages Available:

Gas Flow Controller

Liquid Flow Meter

Controlled Evaporative Mixer (CEM)

HMI 7″ Touchscreen Controller

The CEM Controller features a 7” color touchscreen for an indication of measured values. The touchscreen easily enables the user to change the setpoints and other functions. The controller powers the devices and communicates via Modbus to control the CEM temperature and the instruments’ flow rates. The controller also offers a temperature traced vapor outlet and the option for additional gas or liquid instruments.

1. 7” color touchscreen PLC – Process control and monitoring
2. Mini-USB connection – Program PLC
3. USB Connection – Data transfer or storage
4. CEM Heater & Temperature – Control temperature
5. Heat Trace – Control temperature
6. Heat Trace Temp. – Process temperature thermocouple connection
7. Liquid Meter – Remote control outlet
8. Gas Controller – Remote control outlet
9. Heat Trace – Remote control outlet
10. CEM – Remote control outlet
11. Modbus MJ2–Power (+) – communicates and powers meters/controllers
12. Modbus MJ3
    • additional Modbus RTU communication port
    • does not control CEM system
13. Ethernet Lan1
    • Program PLC
    • Additional communication port
14. Power with On/Off Switch
15. Additional ports