Stafford, Texas

PSC Controlled Evaporation System, Vapor Flow Controller

PSC Controlled Evaporation System, Vapor Flow Controller

The PSC VAPOR-DEPO is a Vapor Deposition and Evaporation Process Operator that is designed for liquid dosing and vapor delivery processes and provides consistent, low flow vapor deposition 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 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.

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
Gas Flow EL-FLOW Prestige Controller
PC-Board RS-232 and Modbus I/O, n.c. controller function
Output/Setpoint 4 – 20 mA output / setpoint or digital 1 – 100%
Supply Voltage +15 – 24 Vdc
Inlet/Outlet Adapter 1/4” OD Compression Type
Seals Viton 51415
Setpoint Mode Controller enabled, Digital Setpoint
Comm. Mode (9 pin) RS-232 (ProPar)
Pin 5 Configuration Disabled, 0 Vdc (Default)
Liquid Flow Meter
Liquid Flow LIQUI-FLOW Meter
PC-Board RS-232 and Modbus I/O
Output/Setpoint 4 – 20 mA output / setpoint or digital 1 – 100%
Supply Voltage +15 – 24 Vdc
Inlet/Outlet Adapter 1/4” OD Compression Type
Seals Kalrez 6375
Sensor Default
Controlled Evaporative Mixer (CEM)
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
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