Description
Inaccurate elevation references cause severe site excavation over-digs and drainage grading errors. The Topcon RL-H5B Laser Kit with Tripod and Fiberglass Grade Rod functions as a self-leveling horizontal rotary laser spinning at 600 RPM. The unit provides zero mechanical drilling torque. Dropping the rotary transmitter onto concrete footing rocks shatters the optical lighthouse glass.
A cast aluminum sub-chassis shields internal motorized self-leveling sensors against ground shock from adjacent pneumatic rammers. S7 tool steel tripod mounting threads anchor the base firm to the included survey tripod. Heavy neoprene perimeter seals block moisture wash-out during heavy downpours. Phenolic composite rotor vanes inside the shop maintenance blower pump dry air through sintered bronze exhaust muffler ports to clear humidity from internal prism assemblies after wet field shifts.
Hardware Performance Matrix
Heavy civil grading demands dependable elevation control across wide construction jobsites. Earthwork contractors set grade heights across commercial pads using this complete laser package.
- 1312-foot working radius covers expansive commercial earthmoving operations
- Electronic self-leveling motor levels the diode within plus or minus five degrees
- High-flow V-style couplers on test bench air regulators supply dry air for seal checks
- Included LS-80X digital receiver detects laser elevation lines through dust and sunlight
- Heavy-duty aluminum survey tripod provides stable mounting elevation on rough soil
- 13-foot fiberglass grade rod graduated in tenths provides clear height readings
- Sintered bronze exhaust muffler elements vent internal pressure without admitting moisture
Air Bench Telemetry Realities
Bench testing the laser housing moisture purge consumes 11 CFM at 90 PSI dynamic shop line pressure. The purge blower turbine achieves 14200 free speed RPM before settling at 9800 loaded RPM under case seal resistance. Supplying dry air through a 50-foot 3/8-inch hose produces an 11 PSI dynamic pressure drop at the inlet fitting. Rapid gas expansion triggers a 26 degrees adiabatic exhaust temperature drop, demanding filtered dry air to stop orifice icing. The tripod mounting thread sustains 34 ft-lbs breakaway torque while overall test noise measures 79 dBA.
Field Service Trade Offs
Grade checkers must spread tripod shoes wide to maintain stability in loose soil or high wind conditions. Do not buy this single horizontal plane laser for pipe grade slope applications where dedicated steep-grade pipe lasers belong. Blasting high-pressure shop blowguns across the lighthouse glass will drive mud particles past perimeter seals and pit the glass.
- Wipe mud from the fiberglass rod sections with fresh water and clean rags.
- Clean the laser lighthouse glass using soft camera lens tissues and alcohol.
- Remove alkaline batteries from the battery tray before long seasonal storage.
Warranty Terms Package Breakdown
Topcon protects this RL-H5B rotary laser with a 5-Year limited warranty against manufacturing flaws and material defects. The complete package contains the RL-H5B rotary laser, LS-80X receiver, rod clamp, survey tripod, 13-foot fiberglass rod, four D-cell batteries, documentation sheets, hard case, and technical operator handbook.