Topcon LS-80A Laser Receiver Sensor for Grade Control
The Topcon LS-80A (Part No. 313510702) is a professional-grade, hand-held laser receiver engineered to detect and measure signals from conventional rotating lasers in demanding construction and utility grade control environments. Whether you're grading a large commercial pad, setting pipe, or establishing elevation benchmarks across sprawling sites, the LS-80A delivers the immediate, accurate feedback that keeps crews productive and grades dead-on. Built for the daily punishment of real jobsites, this receiver combines a wide detection window, multiple alert modes, and durable weather-resistant housing into a compact tool that experienced operators trust.
Overview and Jobsite Applications
Rotating lasers are only as useful as the receiver paired with them. The Topcon LS-80A bridges the gap between the laser plane and the operator on the ground, translating the laser signal into clear directional guidance — up, on-grade, or down — via both audible alerts and a bright LED display visible in direct sunlight. Its broad vertical detection range means less repositioning on a grade rod, keeping field work moving at pace. The LS-80A is compatible with most major brands of rotating laser systems, making it a versatile addition to any contractor's toolkit whether operating with Topcon, other rotating laser platforms, or a mixed fleet of equipment.
Key Specifications
- Model: Topcon LS-80A
- Part Number: 313510702
- Detection Range: Up to 800 m (2,600 ft) diameter with rotating laser
- Detection Window: 165 mm (6.5 in) vertical detection zone
- Accuracy: ±1.5 mm (±1/16 in)
- Display: LED directional indicators with on-grade confirmation
- Audio Alert: Variable-pitch buzzer with selectable modes
- Water Resistance: Weather and dust-resistant housing for outdoor use
- Power: 2 x AA batteries
- Clamp Compatibility: Standard grade rod and staff clamp mount
- Operating Temperature: -20°C to +50°C (-4°F to +122°F)
Key Features
- Wide Detection Window: 165 mm vertical zone reduces rod adjustments and speeds up workflow
- High-Visibility LED Display: Clear up/on-grade/down indicators readable in bright sunlight
- Variable Audio Alerts: Audible tones intensify as the laser beam approaches grade — ideal for noisy jobsite environments
- Long Detection Range: Effective up to 800 m diameter, suitable for large commercial grading and civil projects
- Broad Compatibility: Works with most standard rotating laser systems, not limited to Topcon equipment
- Durable Construction: Weather-resistant housing designed for daily jobsite exposure
- Ergonomic Design: Comfortable hand-held grip and rod-mount clamp for flexible use
- Long Battery Life: Efficient power draw on standard AA batteries for extended field use
Job Applications
Site Grading and Earthwork: Mount the LS-80A on a grade rod and use it with a rotating laser to establish and verify cut/fill grades across large commercial or residential pads. The wide detection window and loud audio alerts let operators work quickly without constantly stopping to read the display.
Underground Utility and Pipe Laying: Set pipe to grade in trenches with confidence. The LS-80A's precision and reliable signal detection help crews maintain consistent invert elevations across long utility runs where accuracy directly impacts system performance.
Concrete Flatwork and Sub-Base Prep: Use the receiver during screeding, sub-base compaction checks, and form setting to ensure finished grades meet specification before concrete is placed — reducing costly rework.
Landscape Grading and Drainage: Establish positive drainage slopes around structures and in landscaping applications where subtle grade differences have major water management consequences. The LS-80A's ±1.5 mm accuracy ensures drainage intent is faithfully executed.
Compatible Accessories
- Topcon Grade Rod Clamp for LS Series Receivers
- Topcon RL-H5A Rotary Laser Level
- Topcon RL-200 2S Dual Slope Laser
- Replacement AA Batteries — Jobsite Pack
- Protective Carrying Case for Laser Receivers
Related Guides
- How to Use a Laser Receiver for Grade Control
- Rotating Laser vs. Grade Laser: Which Do You Need?
- Setting Up a Rotating Laser System for Large Site Grading
- Topcon Laser Receiver Comparison: LS-80A vs. LS-100D
Frequently Asked Questions
- Is the Topcon LS-80A compatible with non-Topcon rotating lasers?
- Yes. The LS-80A is designed to work with most standard rotating laser systems regardless of brand, making it a flexible choice for contractors who operate mixed equipment fleets. Always verify your specific laser's frequency compatibility before purchase.
- What is the maximum detection range of the LS-80A?
- The LS-80A can detect a rotating laser signal up to 800 meters (approximately 2,600 feet) in diameter under favorable conditions, making it well-suited for large-scale grading and civil construction projects.
- Does the LS-80A work in rain or dusty conditions?
- The LS-80A features a weather and dust-resistant housing that holds up to typical outdoor jobsite conditions, including light rain and heavy dust exposure. It is not rated for submersion, so avoid full immersion in water.
- How accurate is the Topcon LS-80A for grade control?
- The LS-80A provides an accuracy of ±1.5 mm (±1/16 inch), which is well within tolerance for the vast majority of grading, utility, and flatwork applications in commercial and residential construction.
