Our load cell is used and shaped as a regular washer and is available in sizes M30 to M64 and 1-1/4” to 2-1/2”. The BoltSafe bolt load sensor is placed on the non-driven side of a bolted connection, preferably under a nut. While tightening the bolt, force is being applied to the load washer, which will result in minor deformation of the stainless steel washer. The sensor constantly measures changes in electrical resistance caused by these deformations. This data is used to determine the bolt load at any given moment.
Because the design of our load cells is so rugged, they are able to withstand harsh conditions, such as heavy industrial environments. The load sensors can be used in contact with oil, rain, seawater, ice and temperatures up to 80 degrees Celsius. Using the washers in conditions where the temperature is above 80 or below -40 degrees Celsius is not recommended.
After the one-time calibration of the sensor by BoltSafe, there is no need for recalibration of the load cells in their service life – not even when different readout methods are used – provided they are used according to their specifications and requirements.