Description
1. Unboxing & Physical Snapshot (Dynamic List)
- Model & Brand: Allen-Bradley / Rockwell Automation Flex Ex Series, Designation: 1797-PS2N2
- Part ID & Catalog Number: 1797-PS2N2 (24 VDC Input, Quad-Ex Output Power Supply Module)
- Physical Dimensions: Heavy-duty cast-metal hazardous area enclosure (approx. 250mm x 180mm x 150mm chassis profile).
- Estimated Shipping Weight: 6.04 kg (13.31 lbs) (Gross weight including foam-lined carton and conduit plugs).
- What’s in the Box: 1x 1797-PS2N2 Power Supply Unit, NPT threaded conduit plug inserts, and 1x Ex-area technical instruction bulletin.
2. Product Introduction
Structure C (Compliance hook): Regulatory authorities strictly mandate that power distribution units feeding hazardous area remote I/O racks maintain absolute galvanic isolation to prevent catastrophic spark ignition in explosive atmospheres. Deploying an authentic Allen-Bradley 1797-PS2N2 module ensures that safety-critical intrinsic safety (IS) loops comply with rigorous NEC, ATEX, and IECEx safety standards.
(Which is critical for passing mandatory annual insurance and OSHA safety audits in petroleum refineries.) The heavy-duty cast-aluminum enclosure houses specialized internal transformers designed to step down cabinet voltage into four separate intrinsically safe output rails. Handling the chassis requires careful attention to the exterior ground studs, as proper equipotential bonding remains mandatory for suppressing dangerous electrostatic charge accumulation.
3. Core Technical Specifications
| Parameter | Value |
| Input Voltage Range | 18 to 32 VDC (24 VDC nominal) |
| Output Channels | 4 Isolated Quad-Ex Output Rails |
| Power Dissipation | 21 W maximum at full operational load |
| Output Power Capacity | 4 x 8.5 W field distribution limit |
| Enclosure Material | Heavy cast-metal housing with threaded NPT entries |
| Net Weight | 6.04 kg (13.31 lbs) |
| Customs Tariff Code | 85044090 |
| Country of Origin | United States (US) / Singapore (SG) |
4. Global Compliance & Industry Certifications
Auditors reviewing hazardous area infrastructure require verifiable documentation proving that power distribution hardware complies with explosive atmosphere safety regulations.
- Expected Certifications: CE Mark, ATEX Directive (2014/34/EU) for Zone 1/2 environments, IECEx, and UL/cUL Listed ratings for Class I, Division 1 and 2 hazardous locations.
- Auditor Value-Add: The ATEX and UL hazardous location listings verify that internal current-limiting barriers prevent electrical energy spikes from igniting ambient combustible gases. Verify specific lot certifications with OEM.
5. Long-Term Storage & Asset Preservation Guide
Hazardous area power supplies often remain stored in bonded stockrooms for years awaiting plant expansion projects. Protect your capital equipment from environmental wear.
- Store the heavy power unit inside its original moisture-barrier anti-static bag, keeping the sealed desiccant active to prevent internal terminal corrosion.
- Maintain warehouse ambient temperatures between -40°C and +85°C to avoid thermal degradation of the internal electrolytic smoothing elements.
- Ensure threaded NPT conduit entries remain tightly sealed with protective plugs to prevent ambient dust from contaminating internal barrier connections.
6. Physical Installation Prerequisites
- Convection Clearance: Leave at least 50mm of vertical and horizontal space around the cast housing to facilitate adequate natural thermal convection in high-ambient enclosures.
- Chassis Grounding: Connect the external ground stud directly to the main equipotential grounding busbar using a low-impedance copper braid.
- Conduit Seating: Apply approved thread-locking compounds and certified explosion-proof sealing fittings on all NPT entries.
7. Buyer’s FAQ (Logistics & Compliance Focus)
- What is the correct Harmonized System (HS) code for clearing this power supply through customs?The standard international tariff classification code is 85044090, covering static converters and regulated power supplies.
- Does this power supply require firmware configuration prior to commissioning?No. As a hardware-based power conditioning and isolation module, it operates completely independently of programmable firmware or software files.
- How does the Country of Origin (COO) impact international shipping documentation?Manufacturing origins alternate between the United States and Singapore; verify the exact COO stamp on the commercial invoice to ensure accurate duty calculations.
- Is specialized transit insurance recommended for high-weight hazardous area hardware?Yes. Due to the high mass of the cast enclosure and sensitive internal transformers, comprehensive freight insurance with shock-monitoring indicators is strongly advised.
