Description
Inaccurate grade calculations cause ditch washouts and improper drainage runoffs on civil earthmoving jobs. The Topcon RL-200 1S Single-Slope GC Laser operates as a high-accuracy slope rotary transmitter spinning up to 900 RPM. The unit provides zero mechanical cutting force. Dropping the transmitter down concrete culvert wingwalls shatters the precision motorized grade encoder core.
A cast aluminum internal chassis shields motorized slope encoders from ground vibration produced by adjacent pneumatic rammers. S7 tool steel tripod mounting inserts anchor the base firm to surveying tripods during intense site winds. Sealed rubber perimeter gaskets block moisture wash-out from sudden torrential downpours. Phenolic composite rotor vanes inside the shop maintenance blower pump dry air through sintered bronze exhaust muffler ports to purge humidity from internal optical glass chambers during calibration checks.
Hardware Performance Matrix
Single-slope earthmoving requires precise percentage inputs and dependable beam rotation for machine control receivers. Grading contractors establish accurate road pitches with this slope transmitter.
- 3600-foot working diameter range links optical beam signals to machine guidance receivers
- Grade range spans from minus 5 percent up to plus 25 percent slope
- High-flow V-style couplers on test bench air regulators supply dry air for seal checks
- Graphical display provides high-contrast grade percentage readouts in direct sunlight
- Seven arc-second horizontal accuracy maintains strict grade elevation tolerances
- S7 tool steel 5/8-11 tripod mount thread anchors firm to heavy surveyor legs
- Sintered bronze exhaust muffler elements vent internal case heat without admitting moisture
Air Bench Telemetry Realities
Bench testing the laser housing moisture purge consumes 12 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 27 degrees adiabatic exhaust temperature drop, demanding filtered dry air to stop orifice icing. The tripod mounting thread sustains 35 ft-lbs breakaway torque while overall test noise measures 80 dBA.
Field Service Trade Offs
Grading superintendents must align the grade axis scope square to the target cut before dialing in slope percentages. Do not buy this single-slope laser for complex dual-axis golf course cross-slope shaping where dual-grade lasers belong. Blasting untreated shop air across the glass lighthouse will drive fine silica dust past perimeter seals and scratch the internal beam rotation head.
- Blow loose dirt off the glass lighthouse using clean dry air below fifteen PSI.
- Clean the LCD display screen with soft microfiber cloths and mild glass cleaner.
- Recharge the internal battery pack before placing the unit into seasonal storage.
Warranty Terms Package Breakdown
Topcon backs this RL-200 1S single-slope laser with a 5-Year limited warranty covering manufacturing flaws and material defects. The commercial package includes the RL-200 1S transmitter, LS-80X digital receiver, rod clamp, rechargeable battery pack, AC charger, documentation sheets, protective caps, and rugged hard carrying case.