Viking Medium Range Proximity Card Reader - PRX-3

Viking Electronics PRX-3 Medium Range 125kHz Proximity Card Reader

Overview

The Viking Electronics PRX-3 is a 125kHz proximity card reader engineered for commercial access control deployments where read range, environmental durability, and long cable runs matter. With a verified read range of up to 16 inches, the PRX-3 bridges the gap between short-range desktop readers and expensive long-range systems — giving integrators a practical, cost-effective option for main entry doors, vehicle gates, and secure vestibule applications without over-engineering the solution. Its compact 8.5" x 6.0" x 1.0" footprint fits standard double-gang surface-mount boxes, keeping installation straightforward on both new construction and retrofit projects. Explore the full Viking Electronics access control line if you're sourcing readers, intercoms, and entry systems from a single vendor.

Key Features

• Up to 16-Inch Read Range: At 16 inches, the PRX-3 (often searched as PRX 3) lets cardholders present credentials without crowding the reader — critical at high-traffic entry points where throughput matters and fumbling with a card against the plate creates a bottleneck. This range also accommodates vehicle-mounted credentials in some configurations.
• 26-Bit Wiegand Interface: The industry-standard 26-bit Wiegand output means the PRX-3 pairs with virtually any access control panel — Lenel, Software House, Honeywell, CCURE, DSX, and dozens of others — without custom wiring or protocol adapters. If your panel speaks Wiegand, this reader integrates the same day.
• IP66 Ingress Protection: Direct rain and driven dust won't affect reader performance. IP66 means full dust closure and protection against powerful water jets — sufficient for covered exterior entrances, parking garages, and building perimeters in most climates. Note: this is not a submersion rating; avoid installations with standing water exposure.
• -40°F to 150°F Operating Range: The PRX-3's temperature tolerance covers extreme northern winters and sun-exposed southern installations in a single SKU. A reader that locks up at -10°F or distorts in a sun-baked metal enclosure creates service calls; this spec range eliminates that concern across most North American climates.
• Up to 100% Operating Humidity: Full humidity tolerance means condensation, coastal salt air, and covered loading dock environments don't require a separate reader spec. Many proximity readers derate reliability in high-humidity conditions — the PRX-3 is rated for the worst case.
• 5–16 VDC Power Input (12V Nominal): The flexible voltage range accommodates both 12V and some 5V panel power outputs without a step-up converter. Average draw is 300mA with a 500mA peak — light enough to run on shared panel power without exceeding typical auxiliary output budgets. A UL-listed 120V AC/12V DC 500mA adapter is included for standalone power.
• Up to 800-Foot Cable Runs: An 800-foot Wiegand cable distance is well above the typical 500-foot limit specified by most access control manufacturers for standard readers. This matters in large facilities — warehouses, campuses, parking structures — where panel closets may be far from the reader location. Fewer home-run cable pulls, less conduit, lower labor cost.
• 125kHz Proximity Technology: HID-compatible 125kHz credentials are already in wide deployment across enterprise card programs. The PRX-3 works with the existing card stock in most commercial environments — no credential re-issue required during reader replacement projects.

Integration & Compatibility

The PRX-3's 26-bit Wiegand output is the de facto standard for commercial access control readers and integrates directly with virtually every major access control panel on the market. Panel-side wiring follows standard Wiegand conventions: DATA0, DATA1, power, and ground. The reader mounts in a standard double-gang back box with minimum inside dimensions of 2.25" deep x 3.65" wide x 2.84" tall — a Carlon BH234R or equivalent works. For surface-mount installations, a dedicated surface-mount box is recommended. The included UL-listed power adapter covers standalone or supplemental power scenarios where panel auxiliary outputs are already loaded. If you're planning a complete entry system, pair this reader with a compatible access control panel and review your Wiegand cable run planning guide to confirm wire gauge against your actual run distance at 800 feet.

Frequently Asked Questions

Q: What card technology does the PRX-3 support?

A: The PRX-3 reads 125kHz proximity cards — the same technology used by HID and compatible credential programs widely deployed across commercial and enterprise access control systems. It does not read 13.56MHz smart cards or mobile credentials.

Q: What is the maximum cable run distance for the PRX-3?

A: Viking specifies up to 800 feet of Wiegand cable between the PRX-3 and the access control panel. This exceeds the 500-foot guideline common in many panel specifications, making it suitable for large facilities with distant panel locations.

Q: Is the PRX-3 rated for outdoor installation?

A: Yes. The PRX-3 carries an IP66 ingress protection rating, covering full dust protection and resistance to powerful water jets. It also operates from -40°F to 150°F. It is not rated for submersion, so avoid installations with standing water contact.

Q: Does the PRX-3 include a power supply?

A: Yes. A UL-listed 120V AC to 12V DC 500mA adapter is included. The reader also accepts 5–16 VDC from a panel auxiliary output, drawing 300mA average and 500mA peak.

Q: What access control panels does the PRX-3 work with?

A: The PRX-3 outputs standard 26-bit Wiegand, which is supported by virtually all major commercial access control panels. Any panel that accepts 26-bit Wiegand readers — including systems from Lenel, Software House, Honeywell, and others — is compatible.

Q: What mounting box does the PRX-3 require?

A: The PRX-3 mounts in a standard double-gang box with minimum inside dimensions of 2.25" deep x 3.65" wide x 2.84" tall. A Carlon BH234R or equivalent works. A surface-mount box is available for surface installations.

Eden Phillips

The spec I keep coming back to on the PRX-3 is the 800-foot cable run tolerance. On most proximity reader jobs, you're fighting against the 500-foot Wiegand limit and either paying for a signal extender or re-routing conduit. Viking's 800-foot spec on the PRX-3 eliminates that calculation in the majority of commercial buildings — I've deployed this reader in warehouse environments where the panel room was genuinely 600+ feet from the entry point, and it just worked without additional hardware.

Technical Highlights:

• 16-Inch Read Range: Substantial for a 125kHz reader — most mid-range proximity units top out at 10-12 inches. The extra distance is meaningful at high-traffic entry doors where throughput and user convenience matter.
• -40°F to 150°F Operating Envelope: This temperature range covers cold-storage facility doors in Minnesota and sun-baked metal enclosures in Arizona in a single SKU. You're not ordering a special cold-rated variant.
• 300mA Average / 500mA Peak Draw: At 12V nominal, that's 3.6W average — well within what most panel auxiliary outputs can sustain. The included UL-listed adapter handles standalone power without sourcing a separate supply.

Deployment Considerations:

• The PRX-3 mounts in a standard double-gang box (Carlon BH234R minimum inside dimensions 2.25" deep x 3.65" wide x 2.84" tall) — confirm box depth before roughing in, especially on retrofit installs where existing boxes may be shallower.
• 125kHz is a legacy credential technology. If your customer is moving toward mobile credentials or smart card multi-factor authentication, this reader does not support those formats — plan accordingly or spec a dual-technology reader for future flexibility.

The PRX-3 is the right call for large-footprint commercial and industrial sites running existing 125kHz card programs where panel-to-reader cable distance is the primary engineering constraint — specifically, covered exterior doors, parking structure entries, and remote building access points on campus deployments where running signal extenders would add cost and complexity.