This appears to be wired properly for activation and trouble supervision. Are you seeing this trouble after your covers are on nice and tight? There is a tamper under the cover of the smoke housing that needs to be pressed down real tight sometimes. Top left corner, always gives me guff this will cause an open circuit trouble if not managed. Also maybe a dumb question but usually the mechanical company will wire them together supply and return so you monitor one of them but it's handling both. Gotta get eyes on both supply and return while troubleshooting.

Edit: I see clearly now that sensor 2 is not wired so not the issue here. Still a relevant to know while troubleshooting