HWT-Pro Hamburg Wheel Tracker Verification & Calibration System

The InstroTek HWT-Pro is a comprehensive verification, calibration, and diagnostic system for Hamburg Wheel Trackers. Instead of verifying individual components with separate tools, the HWT-Pro measures the key parameters affecting Hamburg performance—including wheel load, position, speed, waveform, rut-depth measurement, displacement, and water temperature—and produces a report showing conformity to AASHTO T 324 requirements.

Key Features

• Verifies AASHTO T 324 measurement requirements
• Follows recommendations of NCHRP Project 20-07 Task 361
• Measures static and dynamic wheel load
• Measures wheel position and center point
• Measures wheel speed
• Evaluates wheel-motion sinusoidal waveform
• Reports waveform RMSE
• Verifies displacement/rut-depth measurement
• Measures water temperature
• HWT-Spec software guides the technician through verification
• Produces pass/fail verification reporting
• Measurement devices are NIST traceable
• Useful for troubleshooting as well as routine calibration verification

Included Items

• HWT-Pro carrying case
• Load-verification device
• Height/displacement verification device
• Sample-tray centering spacers for supported Hamburg models
• NIST-traceable temperature indicator
• USB cable
• HWT-Spec PC software
• Calibration certificate / NIST traceability documentation

Typical Applications

Hamburg Wheel Tracker calibration verification, AASHTO T 324 quality programs, equipment troubleshooting, annual verification, pre-season equipment checks, DOT laboratories, asphalt producers, commercial testing laboratories, and BMD laboratories.

Lab Manager's Tip

Don't think of the HWT-Pro strictly as a calibration tool. Its ability to simultaneously evaluate load, wheel movement, displacement, temperature, and waveform makes it particularly useful for diagnosing a Hamburg that is producing questionable or inconsistent results. It can help determine whether the problem is test material—or the machine itself.

• HWT-Pro_Spec_Sheet.pdf