Viking Line Verification Relay - LVR-1

Viking Electronics LVR-1 Line Verification Relay

Overview

The Viking Electronics LVR-1 is a dedicated analog phone line monitoring relay that detects voltage drops on a POTS line and fires a set of relay contacts to alert or trigger downstream security and automation equipment. If you're integrating alarm panels, dialers, or elevator emergency phones into a facility where analog line health is a compliance or operational requirement, the LVR-1 (often searched as LVR 1) gives you a hardwired signal path to a monitoring system without relying on software polling or IP connectivity.

Powered by an included 12V DC adapter (120V AC input, UL listed) and housed in a compact wall-mount enclosure measuring 4.38" x 2.97" x 1.38", this unit drops into an IDF closet, telecom room, or equipment cabinet without consuming meaningful rack or wall space. The 2.1mm DC power plug and optional terminal block give you flexibility in how you wire power, and the dual RJ-11/terminal block connection means you can land the phone line whichever way the installation demands.

Key Features

• Voltage-Drop Trip at 2VDC: The LVR-1 trips its relay when line voltage falls to 2VDC — a definitive indicator of a dead or cut analog line. This threshold is set at the factory; no potentiometer adjustment is needed, which eliminates calibration drift over time and keeps the unit consistent across multiple installs.
• Four Selectable Delay Times (5, 10, 15, 20 seconds): Delay before relay activation prevents nuisance trips from momentary line fluctuations. The 5-second setting is tight enough to catch real outages quickly; the 20-second setting filters transient drops on noisy loop plant without false alarms — choose based on your loop quality and monitoring SLA.
• Relay Contacts Rated 30V DC @ 1A / 110V DC @ 0.3A / 125V AC @ 0.5A: These are dry contacts capable of driving a wide range of downstream loads — indicator lamps, annunciator inputs, panel supervision zones, or low-current solenoids. The AC rating means you're not limited to DC-only control circuits.
• Dual Connection Options — RJ-11 Jack and Terminal Block: Whether you're landing a standard modular phone cable or running bare wire from a 66-block or cross-connect, both termination styles are on-board. No adapter or pigtail required for either approach.
• 12V DC Power with 2.1mm Plug and Terminal Block Option: The included UL-listed 120V AC adapter covers most installations out of the box. The 2.1mm plug accepts standard off-the-shelf replacement adapters if the original is lost. The terminal block power input lets you feed the unit from a supervised DC supply if you need the power circuit monitored by the panel.
• Compact Wall-Mount Housing — 4.38" x 2.97" x 1.38": Ships with two #6 x 3/4" panhead screws. At under 1.06 lbs shipping weight, it mounts on drywall or a backboard without anchors in most cases. The small footprint fits inside most telecom enclosures alongside other small-form telco gear.
• Operating Range 32°F to 90°F (0°C to 32°C), 5%–95% RH Non-Condensing: Designed for conditioned indoor environments — mechanical rooms, telecom closets, and equipment rooms within normal HVAC envelope. Not rated for outdoor or unconditioned spaces; plan accordingly in buildings with wide temperature swings in utility areas.

Integration & Compatibility

The LVR-1 integrates into any system that accepts a dry-contact supervisory input — commercial alarm panels, building management systems, elevator controllers, or annunciator panels. It monitors standard analog POTS lines including those used by emergency dialers and elevator phones. Because the output is a simple relay closure, it is VMS- and platform-agnostic — wire the contacts into whatever supervisory zone your panel provides. For facilities running hybrid analog/IP infrastructure, the LVR-1 pairs cleanly alongside Viking Electronics telephone entry systems and emergency phones where line health monitoring is a code or insurance requirement. Integrators managing multi-tenant buildings or campus environments should consider deploying one LVR-1 per monitored line run rather than relying on periodic manual testing. For broader telephone entry and line monitoring options, explore the full Viking line monitoring product family.

Frequently Asked Questions

Q: What voltage level triggers the LVR-1 relay?

A: The LVR-1 trips its relay contacts when line voltage drops to 2VDC. This threshold is factory-set and is not field-adjustable.

Q: Can I select how long the LVR-1 waits before activating the relay?

A: Yes. The LVR-1 offers four selectable delay times: 5, 10, 15, and 20 seconds. This lets you tune the unit to filter momentary line fluctuations and avoid nuisance activations on your specific loop plant.

Q: What are the relay contact ratings on the LVR-1?

A: The relay contacts are rated 30V DC @ 1A, 110V DC @ 0.3A, and 125V AC @ 0.5A — suitable for driving indicator lamps, annunciator inputs, supervisory panel zones, and low-current control loads in both DC and AC circuits.

Q: How do I connect the phone line to the LVR-1?

A: The LVR-1 accepts the phone line via either an RJ-11 modular jack or a terminal block — both are provided on the unit. Choose whichever termination method your installation requires; no adapter is needed for either.

Q: Can the LVR-1 be powered from a supervised DC supply instead of the included AC adapter?

A: Yes. In addition to the 2.1mm DC power plug (used with the included 12V AC adapter), the LVR-1 provides a terminal block power input that accepts direct DC wiring — allowing you to feed it from a supervised panel power supply if needed.

Q: Is the LVR-1 suitable for outdoor or unconditioned space installation?

A: No. The operating temperature range is 32°F to 90°F (0°C to 32°C) and humidity is rated 5%–95% non-condensing. The LVR-1 is designed for conditioned indoor environments such as telecom closets, mechanical rooms, and equipment cabinets within normal HVAC envelope.