IECEx, ATEX & INMETRO Certified Purge and Pressurization System for large Electrical Machines
Features
● Global certification
● Purge flow rate up to 6,000 Nl/min
● Use CLAPS technology to ensure internal pressure of the equipment
● Stainless steel shell structure
● Temperature range -20°C to +55°C
● Motor cavity pressure display
The D555 positive pressure purge system delivers purge flows up to 6,000 Nl/min and is ideal for medium to large Ex p motors.
The system includes a control unit (CU) and a ventilation unit (RLV). The control unit contains pneumatic logic for monitoring and controlling air flow, pressure and purge time,
and provides system outputs. The RLV measures the purge flow at the outlet and provides overpressure protection for the machine.
The D555 features Expo’s Leakage Compensation System (CLAPS). The system is able to detect changes in pressure inside the housing and adjust leak compensation accordingly.
Pressure changes typically occur during sudden starts of large rotating machines, but can also be caused by changes in operating temperature. The system is specifically designed to
maintain stable internal pressure within the motor housing.
The D555 system is equipped with a motor cavity pressure gauge, which can visually display the motor cavity pressure.
*There are a number of system variants available covering alternative alarm output connections - see specifications and downloads for further details.
| Air Inlet | Instrument quality air，5-10 barg |
| Purge flow rate | 2,000、3,000、4,000、5,000、6,000 NI/min |
| Leakage compensation capacity | Up to 1,900 NI/min |
| Temperature range | -20°C to +55°C |
| Purge timer | 1-99min |
| Timer power source | IS (Intrinsically Safe) Battery or Electro-Pneumatic Power Supply (EPPS) |
| Signal outputs | Function: Power interlock, low pressure alarm, intermediate pressure alarm, purge in progress (optional) |
| Certifications* | IECEx、ATEX、INMETRO |
*Not all certifications apply to all system variants. Check the specific Operating and Maintenance Manual for details.
