How does the PMS bolt load cell work?
The BoltSafe bolt load cell is a load cell (load sensor) that is specifically designed to monitor the actual bolt load in bolted joints. PMS stands for Periodic Monitoring System, which allows for monitoring the bolt load at any given time provided that the handheld reader and a probe are used. The PMS load sensors have a non-contacting interface and do not require a cable connection. During service, the unit is powered over an inductive interface connected to a handheld instrument. The bolt load can be monitored directly on the handheld reader using a probe. Using a BoltSafe load cell eliminates any uncertainties about the bolt load. This gives the structure enhanced safety and control and makes the joints more dependable. Besides the safety benefits, there is also a cost reduction during installation and throughout the joint’s service life.
Each sensor utilizes an ASIC (Application Specific Integrated Circuit), which takes care of all signal conditioning and digital communication. Therefore, each BoltSafe load cell has a unique serial number so that it can be individually identified and traced. The digital monitoring system is not only capable of measuring the bolt load, but can also monitor the sensor temperature. The load cell is available in two kinds of steel: our regular stainless steel, and a stronger version that can withstand 15% more load while keeping the same compact dimensions.
Another application of the load cells is in temporary construction or for Structural Health Monitoring. In this case the sensors are used as washers to check the load in the construction to prevent the (temporary) construction from collapsing.
