Areas with strong air currents (near fans or open windows) or extremely damp locations. Operating Status & Display Codes Display Code Blinking Dash (-) Preheating The sensor is warming up; detection is No detectable gas levels. Safe zone; minimal concentration. Increasing gas concentration; audible alarm begins.
Once you have the manual, pay special attention to these chapters. Below is a summary based on common BRJ-502 revisions. boiros brj-502 manual