Pressure protection 2.0 System and components

The explosion protection at the "overpressure system 2.0" is realized by operating a non-explosion-protected equipment in a protected enclosure. This housing is protected by a durable pressure with air or an inert gas prior to penetrate the enclosure or cabinet by possibly explosive atmosphere. In the new approach developed by Quintex, it is not flushed, but released for operation by a gas detector of the cabinet. This ensures that no explosive gas/air mixture is present. This saves time, programming knownledge and expensive pressurized air and accelerate the operation of the non ex devices.

In operation and after releasing, a positive pressure in the mbar range is maintained within the cabinet. On the input side of pressurized air (gas) you can uses solenoid valves (open / closed) as well as proportional valves to cover the air leakage of the cabinet.With our control unit for digital valves, the pressure air is supplied through a hysteresis in the range of 6mbar(hPa) (valve open) and 10mbar(hPa) (valve closed). This can be omitted expensive proportional valves and simultaneously thus leakage changes (e.g: Increasing the leakage losses due to aging processes), are automatically compensated.

System can be delivered with all components mounted and wired or customer can receive empty enclosure earlier, assemble everything on his own and than retrieve the label. After manufacture and test the enclosure together with the overpressure system we send the enclosure. The enclosure is made as a plug and play version – after the connection of the power supply and the pressure the system starts automatically. The installation and wiring from the inside components are be done from the customer.

After checking the documentation from the customer:

• BOM (bill of materials)
• Wiring diagram
• Pictures
• Power dissipation

After a positive test we send the type label.

Standard list of components which build the whole system are listed below.

1. EX d time relay with power supply.
2. Gas warning controller Honeywell XCD IR.
3. Quinguard controller with valve and interface modul.
4. Terminal block.
5. Digital valve NW 6 NO with leakage valve.
6. Reference breather.
7. Safety outlet FGO.

In case of need of obtaining additional information about the system, it’s components or idea of pressurized protection, please check data available for download from this website.