
PLC/HMI Control
A human-machine interface (HMI) device is the primary tool by which the operator can read and control the main parameters of the system or installation. The parameters and current status presented on the HMI display are grouped on individual screens, corresponding to functions controlled by the PLC unit.
Manufacturer
Prevac
Prevac are a world leader in the design and production of analytical and deposit scientific and research equipment. Their systems operate in a high and ultra high vacuum environment. They design and construct UHV and HV systems fully adapted to the individual requirements of research projects and industrial applications.

Description
As standard, the HMI is mounted in an electronic rack, but can also be mounted as an additional, large touchscreen on a rotary arm. For convenience, the HMI device can be integrated with the system frame, e.g. right next to the process chamber.
Applications
The HMI device can read and control e.g.:
- Vacuum level
- Gate valves
- Switch box
- Opening/closing the shutters
- Manipulator motion/positioning
- Sample holders transferring
- Sample holders heating & cooling
- Gas dosing
- Safety interlocks.
Service Support
Comprehensive repairs and servicing
Annual Support Programs
Your metrology instrumentation is a major investment that is critical to your business operation and success. In today’s competitive climate, it is more important than ever to extend the functionality and peak performance of your metrology equipment years beyond the expiration of your factory warranty. CN Tech’s Support Programs will help ensure that your investment is protected, and that you and your instrument’s are always operating at peak performance.
With over 20 years’ experience servicing and repairing you can be assured that your system is in safe hands. The independent services we offer include system relocation, maintenance visits, parts and consumables, and break down interventions.
CN Tech’s Support Programs are an economical way to guarantee optimal working condition:
- Annual Preventive Maintenance
- Priority Technical Assistance
- Preferred Parts Availability
- On-Site User Training
- Remote Diagnostics
- No surprise repair expense and much more!
Support Contact Example
An example of our service and support contracts are shown below:

Metrology & Instrumentation Annual Support Programs 2024/25
CN Tech's Support Programs will help ensure that your investment is protected, and that you and your instrument’s are always operating at peak performance.