STS4 Automatic Load Position Tracker

STS4 Automatic Load Position Tracker

The STS4-ALPT is an Automated Load Position Tracker that has been designed to be used with our Structural Testing System for the purpose of wirelessly tracking the longitudinal position of a vehicle that is being used as the test vehicle for a diagnostic load test.  This device easily clamps on to the back of most vehicles and contains a rotary encoder that has been calibrated to record linear position.  The STS4-ALPT wirelessly connects to a mating Base Station (STS4-WBS) and can similar to an STS4 Node in that it seamlessly connects to the fielded STS4 system to provide an accurate longitudinal position of the loading vehicle as it crosses the structure during a diagnostic load test. 

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Features – STS4 ALPT

  • Rugged machined aluminum enclosure
  • Weatherproof 
  • Quadrature encoder, providing <1% accuracy 
  • 900Mhz & 2.4GHz radios 
  • >1-mile range 
  • Universal mounting bracket 

specifications – Auto Load Position Tracker

Rotary Encoder 1000 pulses per revolution
Accuracy < 1%
Range1 4 miles (6.5 km) 2.5 miles (4 km)
Radio Frequency 900 MHz 2.4 GHz
Li-Ion Battery +10.8 Vdc (Nominal), 8.7Ah, 93Wh
Typical Power Consumption 5.1W 4.5W
Protection Designed to exceed IP66
Size 9.9 x 9.25 x 2.25 in (175 x 235 x 57 mm) 9.9 x 9.25 x 2.25 in (175 x 235 x 57 mm)
Weight 9.5 lb (4.3 kg) 9.5 lb (4.3 kg)
Operating -4°F to +140°F (-20°C to +60°C)


1 The stated range is based on line-of-sight. Range will be reduced with physical interfence within the line-of-sight.


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