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CMS Bolt Load Cell

The BoltSafe bolt load cell is a specialized sensor designed to monitor actual bolt load in bolted joints. With the Continuous Monitoring System (CMS), multiple load sensors can be networked to track bolt load in real-time from a single connection point. By eliminating uncertainties about bolt load, BoltSafe enhances safety, ensures more reliable joints, and provides better structural control. Additionally, it helps reduce installation and maintenance costs throughout the joint's lifespan.

Specifications

Create a table from - datasheet including 

  • Bolt Size
  • Max Load 
  • Steel Weight

 

Bolt Size Clearance Hole ID Outside Diameter OD Overall Thickness T Steel Weight Max. Load Measuring Surface IM Measuring Surface OM
mm inch mm inch mm inch gr oz kN lbf mm inch mm inch
M20 20,4 0.8 37,0 1.46 14 0.55 73 2.58 166 37318 22,0 0.87 27,7 1.09
M22 22,4 0.88 40,0 1.57 14 0.55 85 3 208 46760 24,2 0.95 31,4 1.24
M24 24,4 0.96 44,0 1.73 14 0.55 104 3.67 239 53729 26,4 1.04 33,3 1.31
M27 27,4 1.08 50,0 1.97 14 0.55 137 4.83 315 70815 29,7 1.17 38,0 1.5
M30 30,6 1.2 56,0 2.2 17 0.67 214 7.55 385 86551 33,0 1.3 42,8 1.69
M33 33,6 1.32 58,0 2.28 17 0.67 218 7.69 480 107908 36,3 1.43 46,6 1.83
M36 36,6 1.44 66,0 2.6 17 0.67 295 10.41 560 125893 39,6 1.56 51,1 2.01
M39 39,6 1.56 68,0 2.68 17 0.67 300 10.58 670 150622 42,9 1.69 55,9 2.2
M42 42,6 1.68 75,0 2.95 20 0.79 445 15.7 772 173553 46,2 1.82 60,0 2.36
M45 45,6 1.8 80,0 3.15 20 0.79 506 17.85 905 203452 49,5 1.95 64,7 2.55
M48 48,6 1.91 86,0 3.39 20 0.79 591 20.85 1018 228856 52,8 2.08 69,5 2.74
M52 52,6 2.07 92,0 3.62 20 0.79 669 23.6 1221 274492 57,2 2.25 74,2 2.92
M56 56,6 2.23 100,0 3.94 20 0.79 798 28.15 1408 316531 61,6 2.43 78,7 3.1
M60 60,8 2.39 108,0 4.25 23 0.91 1083 38.2 1647 370260 66,0 2.6 83,4 3.28
M64 64,8 2.55 114,0 4.49 23 0.91 1196 42.19 1794 403307 70,4 2.77 88,2 3.47
M64HV 68,4 2.69 120,0 4.72 23 0.91 1310 46.21 2100 472099 73,5 2.89 93,0 3.66
M72 72,8 2.87 124,0 4.88 23 0.91 1360 47.97 2250 505820 79,2 3.12 104,0 4.09
M72(HV) 72,8 2.87 124,0 4.88 23 0.91 1370 48.32 2500 562022 78,4 3.09 110,0 4.33

Overview of the BoltSafe CMS Bolt Load Cell

The BoltSafe CMS (Continuous Monitoring System) bolt load cell is a specialized load sensor designed for accurate monitoring of bolt loads in bolted joints. This system allows real-time tracking from a single connection point and can connect multiple sensors in a network for extensive monitoring. By using this load cell, users gain valuable insights into bolt loads, which enhance joint reliability, safety, and control while reducing installation and maintenance costs.

Advanced ASIC Technology for Precision Monitoring

Each BoltSafe load sensor is equipped with an ASIC (Application-Specific Integrated Circuit) for signal processing and digital communication, providing every sensor with a unique serial number for traceability. Alongside bolt load measurement, the system can monitor sensor temperature, offering a complete data set for monitoring conditions. BoltSafe load cells are available in two types of steel—standard stainless and high-strength variants that withstand 15% more load while maintaining a compact size.

Applications in Structural Health Monitoring and Temporary Construction

BoltSafe load cells are also used in temporary constructions and structural health monitoring. Acting like a washer, the load cell measures load levels to prevent collapses and other structural failures. Available in sizes from M12 to M72 and 7/8” to 2-3/4”, it is typically installed on the non-driven side of the connection, under a nut, where it senses deformations from applied force. These changes alter electrical resistance, allowing real-time load data to be recorded. The rugged design of the load cell withstands harsh environments, including oil, seawater, and extreme weather, and operates effectively between -40 and 80 degrees Celsius. Pre-calibrated at the factory, BoltSafe load cells require no further calibration if used as specified.

Advantages of Continuous Monitoring

Continuous monitoring with the CMS load cell allows users to track bolt load directly while the cell is in use. In addition to real-time insights, historical data is accessible, making it easier to pinpoint when and where bolt load issues might have arisen. Networked CMS load cells facilitate broader monitoring, enabling data from multiple sensors to be managed collectively and remotely.

Readout Options for the CMS Bolt Load Cell

The CMS load cell is compatible with multiple readout options to suit various monitoring needs:

1. Handheld Reader: A quick, cable-connected solution for on-the-spot bolt load readings.

2. Network with PDI and PDI-NT: The CM-1000 box with PDI connects multiple sensors to a Windows PC, while the standalone PDI-NT display option doesn’t require a PC. Both systems support monitoring up to 256 interconnected CMS sensors.

3. RS-232 and Analog Converter: Suitable for monitoring single sensors and provides analog output. It includes a relay function for setting load threshold alarms.

4. IoT-Node for Remote Monitoring: The IoT-node uses LoRaWAN technology to transmit data to a cloud server, enabling remote access from any device with internet connectivity. Each load cell sensor requires a separate IoT-node for connectivity. 

These varied options make the CMS load cell a versatile and efficient tool for continuous bolt load monitoring across multiple applications.

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A load cell is used to measure force or weight by converting mechanical energy into an electrical signal that can be processed and analyzed.

Load cells are applicable in industries like manufacturing, construction, aerospace, automotive, logistics, healthcare, and research, for applications that require force, weight, or load measurement.