Theta Sensors Corporation
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Wireless Bolt Preload Sensor SAS120
SAS120, Ultra-thin probe design; separate main body and probe- CommunicationBluetooth 5.0
- Feature DataPreload
- Bolt RangeBolts with limited installation space or with hexagonal holes
Installation on threaded end: M30 and above
Installation on hexagonal head: M20 and above
Total length of bolts: 150-6000mm - Preload Accuracy1.5%
- Temperature Range-40～85℃
- Temperature Accuracy±1℃
- Explosion ProtectionEX ia IIC T4 Ga
- Ingress ProtectionIP67
- Battery Life10 years
Product Overview
Technical Specifications
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System Architecture
Overview
The SAS series wireless bolt preload sensors are industrial-grade sensors designed to monitor the health of critical bolts in industrial equipment. Built for harsh environments, these sensors offer exceptional resistance to interference, high accuracy, ultra-low power consumption, and long-lasting durability for continuous operation.
Using ultrasonic technology, each sensor accurately measures the time of reflective ultrasonic waves. Additionally, the integrated temperature probe measures the surface temperature of the bolt. With a temperature compensation algorithm, the sensor ensures precise and reliable measurement of the bolt's preload (axial tensile force) across varying temperatures.
The SAS120 features a slim probe design, making it perfect for applications with limited space, such as blade bolts in wind turbines, or bolts with internal hexagonal holes.
The sensor is transmitted wirelessly to a remote monitoring system, enabling users to remotely monitor the bolt preload and receive timely alerts in case of loosening, fatigue, or fracture. This continuous monitoring ensures safe operation, reduces unplanned downtime, and minimizes maintenance costs.
The SAS series bolt preload sensor is installed non-intrusively at one end of the bolt. It emits ultrasonic waves into the bolt's interior, and when these waves reach the opposite end or a fracture surface, they are reflected back to the sensor for processing. Using advanced signal processing technology and temperature compensation algorithms, the sensor accurately calculates the preload and evaluates the bolt’s condition, detecting issues such as loosening, fatigue, or fracture.
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