A supervisor watchdog circuit was developed to both monitor the dose and temperature at an accelerator beamline and provide signals to the safety interlock system of the accelerator. The implementation involved a D type flip-flop and subsequent logic gates to monitor the input and output signal states. It used a series of LEDs to inform the user about the state of the system and to enable identification of issues causing the beamline to shut down. The design allowed for a manual circuit restart to be performed to continue signal monitoring and accelerator operation. The supervisor watchdog circuit was installed at the tandem accelerator of the Reactor Materials Testing Laboratory at Queen’s University to monitor the beam properties during nuclear materials irradiation experiments. The scope for future improvements of the circuit such as automatic circuit restart in case of power fluctuations and addition of new signals is discussed.