Technical Deep Dive into Grade Control Performance

Today’s asphalt paving specifications demand precision that only advanced electronic leveling systems can deliver. The APOLLO 70618034 sensor kit, built for BOMAG pavers, integrates high-sensitivity pendulum measurement with robust outdoor protection to keep screeds exactly on grade. This deep dive explores the engineering behind the sensor set and explains why procurement and technical decision-makers are upgrading to this automatic control solution.

At the heart of the 70618034 lies a pendulum-based inclinometer that translates mechanical displacement into an electrical signal with minimal hysteresis. APOLLO packages this sensing element inside a sealed chamber that shields it from dust, asphalt fumes, and moisture. The rainproof design passes field-tested water spray standards, ensuring that sudden rainfall does not interrupt paving progress. For site managers and reliability engineers, this translates into fewer unplanned stops and consistent data integrity.

The sensor’s metal and high-strength plastic housing combines electromagnetic compatibility with mechanical toughness. Unlike open-frame sensors that can develop signal noise when working near high-power generators or vibratory rollers, APOLLO’s shielded construction suppresses interference. The result is a clean, stable output that feeds into the paver’s electronic control unit without triggering false corrections.

This automatic control system works by continuously comparing the screed’s actual position to the design reference. When deviations occur, the sensor signals proportional hydraulic commands that adjust the tow-point cylinders, returning the screed to target. Because the response time is fast, corrections happen smoothly rather than in abrupt jerks that could imprint the mat. Pavement engineers will recognize this as a critical factor in eliminating transverse ripples and maintaining uniform density.

The 70618034 sensor kit also supports dual-grade operation, where signals from both sides of the screed are processed simultaneously. This allows for true cross-slope control, particularly valuable on super-elevated highway curves or airport apron paving where transverse drainage takes priority. The sensor’s repeatability ensures that day-to-day calibration remains consistent, reducing the need for on-site fine-tuning.

From a procurement standpoint, total lifecycle cost matters as much as initial price. APOLLO’s choice of corrosion-resistant materials, sealed connectors, and abrasion-resistant cabling extends the service interval. The wiring harnesses are routed through protective conduit points that prevent damage from hot mix spillage or aggregate abrasion. Maintenance crews appreciate the easy-access design, which allows visual inspection without disassembling surrounding guard structures.

For BOMAG equipment operating in seasonal climates, the sensor set performs reliably across a broad temperature range. Cold starts on chilly mornings do not degrade measurement accuracy, and the high-temperature resilience stands up to radiant heat from fresh asphalt. This stability reduces measurement drift that could compromise early-morning and late-afternoon paving quality.

APOLLO engineered the 70618034 to interface directly with BOMAG’s electronic architecture. The kit’s connectors are keyed and labeled, minimizing installation errors. Once mounted, the sensor communicates through the machine’s CAN bus or analog input module, depending on generation. Engineering teams tasked with upgrading older pavers find that the sensor set modernizes grade control capability without replacing the entire leveling system, offering a budget-conscious path to improved ride quality metrics.

Several design elements elevate the APOLLO sensor above commodity alternatives. A temperature compensation circuit within the pendulum module prevents thermal expansion from skewing the null point. The sensor’s fused electrical protection guards against voltage spikes from the paver’s alternator. Together, these features provide the robust, no-excuses performance expected on high-value paving contracts where International Roughness Index penalties are at stake.

By delivering stable, precisely timed data, the 70618034 helps the paver maintain target mat thickness even through transitions where material head varies. This capability is particularly valued in variable-depth overlay applications and when paving on milled surfaces with uneven texture. Decision-makers evaluating total project cost understand that such precision directly reduces material overrun and rework.