A Pilot Study on Acquiring Metric Temporal Constraints for Events

For use in a tubing conveyed perforating gun assembly, the assembly including N shaped charges, a safety device is disclosed. In the preferred and illustrated embodiment, the safety device includes an N+1 shaped charge positioned to destroy a transmitter means forming a signal transmitted up the well. The transmitter means is secured within a cylindrical housing closed by a sacrificial cover, all assembled to the TCP gun assembly.