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Technical Specifications and Controller Design
This purge controller manages pressurization and purging for ABB hazardous area enclosures. The ABB 3HNE06225-1/07 maintains safe internal pressure for explosion-proof electrical equipment. You can install this controller directly onto a DIN rail inside the protected enclosure. Its compact design suits Zone 1 and Zone 2 hazardous area applications. The controller weighs approximately 0.65 kilograms. Its dimensions measure 15 cm in height, 11 cm in width, and 8 cm in depth.
| Parameter | Specification |
|---|---|
| Brand | ABB |
| Model | 3HNE06225-1/07 |
| Category | Purge Controller / Enclosure Pressurization Unit |
| Weight | 0.65 kg |
| Height | 15 cm |
| Width | 11 cm |
| Depth | 8 cm |
| Protection Type | Ex p (pressurized enclosure) |
| Certification | ATEX, IECEx, Zone 1 and Zone 2 |
| Input Voltage | 24V DC (±20%) |
| Power Consumption | 5 Watts maximum |
| Pressure Sensor Range | 0-10 mbar (differential) |
| Purge Gas Connection | 1/4 inch BSP female thread |
| Purge Flow Rate | 20 to 200 L/min (adjustable) |
| Purge Cycle Time | 30 to 300 seconds (programmable) |
| Relay Outputs | 2 changeover (power OK, alarm) |
| Alarm Output Rating | 2 Amps at 250V AC / 30V DC |
| Degree of Protection | IP65 (enclosure) |
| Energy Storage | None (no battery) |
| Component Count | Pressure sensor, flow regulator, control PCB, relay outputs |
Pressurization Control and Monitoring
The controller continuously monitors internal enclosure pressure against ambient reference. It maintains the pressure between 0.5 and 5.0 mbar during normal operation. The ABB 3HNE06225-1/07 initiates a pre-purge cycle before applying power to internal equipment. This purge cycle flushes out any hazardous gas from the enclosure. The controller measures purge duration based on enclosure volume automatically. A green LED indicates safe pressure status and purge completion. The controller prevents power application until the purge cycle finishes successfully.
Alarm and Safety Functions
The controller generates an alarm when internal pressure drops below the safe threshold. This alarm can trigger external warning devices or shutdown systems. The ABB 3HNE06225-1/07 includes a pressure loss delay timer to prevent nuisance alarms. You can set this delay from 0 to 60 seconds using the front panel. The controller also monitors purge gas supply pressure for low flow conditions. A red LED illuminates when any alarm condition occurs. The controller provides a volt-free relay contact for remote monitoring.
Installation and Operational Guidelines
You must mount this controller inside the pressurized enclosure on a DIN rail. The enclosure must have a certified inlet for the purge gas connection. The ABB 3HNE06225-1/07 requires clean, dry instrument air at 4-8 bar supply pressure. You must connect the pressure reference line to outside the enclosure. This reference line must not exceed 10 meters in length. The controller requires no external battery for normal operation. You should perform a purge cycle test after every enclosure opening. The operating temperature ranges from -20°C to +55°C.