Laser Component

ST400 Sonic Tracer

Uses a physical reference as an elevation reference

The ST400 is mounted to the blade and uses a physical reference such as curb and gutter, stringline, existing or previous pass as an elevation reference.

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Ultrasonic Grade Control Sensor

What is the Trimble ST400 Sonic Tracer?

The Trimble ST400 Sonic Tracer is an ultrasonic grade control sensor used on dozers and motor graders to maintain accurate elevation based on a physical reference such as stringlines, curbs, gutters or previous passes. It helps operators achieve consistent grading results without relying on GNSS or laser systems.

ST400 Sonic Tracer Overview

Feature Trimble ST400 Sonic Tracer
Technology Ultrasonic sensing
Use case Grade control using physical reference
Machine compatibility Dozers and motor graders
Accuracy ±1 mm
Setup Single or dual sensor
Integration Trimble GCS900 systems
Key Features

Key Features of the Trimble ST400 Sonic Tracer

The ST400 has been designed with the features necessary to deliver precise, reliable grade control using physical references on site. From its high-accuracy ultrasonic sensing to its clear multicolour display, every aspect of the ST400 supports efficient operation and consistent results across a range of grading applications.

  • Ultrasonic sensing technology for precise grade referencing

  • Maintains consistent elevation using physical references such as stringlines or curbs

  • High accuracy of up to ±1 mm for tight tolerances

  • Compatible with Trimble GCS900 grade control systems

  • Supports single or dual sensor configurations

  • Clear multicolour display for real-time operator feedback

Versatile On-Site Applications

Where is the ST400 Sonic Tracer Used?

The ST400 Sonic Tracer is well suited to a wide range of heavy and highway construction applications where physical reference-based grading is required. By emitting ultrasonic signals to maintain a precise distance or elevation from a reference surface, the ST400 gives operators accurate, real-time grade control without the need for GNSS or laser systems. Its selectable sensor accuracy, flexible single or dual sensor configuration, and compatibility with GCS900 Grade Control Systems make it a practical and dependable choice for contractors working across road construction, earthworks and final trim grading applications.

The ST400 Sonic Tracer is commonly used in:

  • Road construction for curb and gutter grading

  • Earthworks where stringline grading is required

  • Final trim grading using previous passes as reference

  • Highway projects requiring consistent elevation control

The Trimble ST400 Sonic Tracer uses ultra-sonic signals to maintain a set distance or elevation from an object, a design surface, or the ground. When mounted to a motor grader or dozer blade, the ST400 Tracer can be used to reference a string line, curb and gutter, or previous pass as a grade control reference.

The ST400 Sonic Tracer offers heavy and highway contractors:

  • Multicoloured integrated grade display – conveys clear grade feedback to the machine operator for higher productivity

  • Selectable sensor accuracy – provides typical accuracy of +/- 1mm to control elevation for even the tightest jobsite specifications

  • Can be used in single or dual configuration and is compatible with GCS900 Grade Control Systems

FAQs

Frequently Asked Questions

Find answers to the most commonly asked questions about the ST400 Sonic Tracer below. If you require further technical information or would like to discuss your specific project requirements, our team at Sitech SA is ready to assist.

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See the ST400 Sonic Tracer in Action

Explore the ST400 Sonic Tracer from multiple angles and get a closer look at its design, key components, and real-world durability.

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