ST400 Sonic Tracer
Grade Control Component – Laser Component
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.
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 of the Trimble ST400 Sonic Tracer
- 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
Where is the ST400 Sonic Tracer Used?
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
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Frequently Asked Questions
What does a sonic tracer do?
A sonic tracer uses ultrasonic signals to measure distance from a reference surface, helping maintain consistent grading elevation.
What machines use the ST400 Sonic Tracer?
It is used on motor graders and dozers for precise grade control.
Is the ST400 compatible with Trimble systems?
Yes, it integrates with Trimble GCS900 grade control systems.
When should I use a sonic tracer instead of GNSS?
Sonic tracers are ideal when working with physical references like stringlines or curbs where GNSS is not required.
Who should use the Trimble ST400 Sonic Tracer?
The ST400 Sonic Tracer is best for contractors working on road construction, earthworks and grading projects that require precise elevation control using physical references such as stringlines, curbs or previous passes.