Pressurization Systems (Also known as Purge Systems)
The concept hazardous protection Exp ,i.e.of pressurization of a control panel making use of standard electrical components to enable them to be used in a hazardous area .Ingress of a potentially hazardous gas into the enclosure containing electrical equipment is prevented by maintaining a gas shield (air or inert gas)inside the enclosure above the atmospheric pressure. The overpressure is maintained and monitored. A loss of overpressure will isolate the electrical supply to the cabinet. Flushing (or purging) of the enclosure prior to maintaining an overpressure is an often used method.
QUINTEX has developed a new approach to pressurization systems. Instead of flushing with a purge medium, the Exp cabinet is tested by gas detection measurement. Stationary automatically or on-site with a handheld detector)
Thereafter an overpressure will build up and all internal devices will be activated. The controller will continuously monitor the over-pressure and switch off power to the panel on pressure loss.
Internal power feed is supplied through a patented contactor which operates on the dual protection system exe/exp. Thereby eliminating the requirement for an Exd housing for the power within the cabinet.
As part of the pressurization system PCs can be fitted into enclosures and thereby used directly in hazardous areas.
Exp PC systems (with keyboard/touch screen)
Below is a prime example of a customized enclosure containing a touch screen, enabling a standard PC+TFT to be used. NO NEED FOR
Approved for zone 1 and zone 2.
This enables standard PCs and upgrades to be used.