The PIG SIG indicator is a computerized electronic device used to non-destructively detect pigs equipped with a magnet or a magnetic transmitter. The PIG SIG indicator does this through a dedicated antenna located at the bottom or fixed to the pipe (near). If a pig passes, the antenna emits a signal to the computer on the panel. The following is a small series for everyone to talk about PIG SIG installation requirements and maintenance matters, I hope to help everyone.