In some critical bolting applications, factors such as friction or bolt/joint geometry are such that the measurement of applied torque alone will not provide the degree of accuracy necessary to control the preload within the required limits. Likewise, many critical applications also demand that bolt preload be monitored over the service life of the fastener as part of a predictive or preventative maintenance program. In these applications, ultrasonic measurement of fastener elongation and/or load has frequently proven to be the most accurate, reliable and cost effective solution.
Ultrasonic measurement of bolt preload is made possible by introducing a sonic pulse at one end of the fastener and accurately measuring the time of flight (TOF) required for the echo to return from the opposite end; using material constants, the USM-II converts this TOF into an "ultrasonic length" of the fastener, providing a baseline from which future measurements will be made. When the fastener is tightened, the TOF increases and the USM-II will again utilize material constants to eliminate the effects of stress and temperature variations on sound velocity, providing an accurate elongation or load measurement.
The USM-II uses state of the art hardware and software to achieve these measurements with maximum automation, and minimizes the need for operator interpretation. Offering digital recordation and transmission of data, as well as calibrated analog signal output the USM-II provides a complete system for measurement, recordation, and control of fastener tension in the most demanding applications.
BOLT LOCK with one key slot to block a sector.
Lock with bolt (diameter 10 or 15) designed to easily loosen a contact block associated with the manipulation of the lock bolt.
Mechanical blocking of circuit breaker, fused sectioning devices, valve, commands …
Associated with a contact permits blocking of control circuits.
Coding is done in the body of the lock.
STI provides key number management by site (please contact us).
Related with an access lock, the version of this device without a contact does not need any wiring (key transference)
Compact lock (without barrel): the key directly moves the bolt drive.
Positive Safety: Opening of the contacts related to the movement of the bolt (key liberation which moves the bolt)
Function: Key free – bolt out / key held – bolt inside. Safety contacts permit blocking of the control circuit and/or resending information, a signal, …
