Any security panel will work, program it as water flow or 24hr audible fire.

You will require a separate flow switch provided by the mechanical/sprinkler company. You cannot use one that is being used by any 120volt bells if there is one wired to it now (sometimes they install one bell on a riser with no fire panel).

The switch will short on alarm, use an EOL resistor across the switch so when it is in the normal non-alarm state, the alarm reads the resistor (this supervises the circuit to let you know that zone is working which is required).

Here in my area we are required to carry a license to work on fire alarms/sprinkler systems. Always check the authority having jurisdiction and fire codes in your area before even touching anything.

They will also tell you what type of monitoring is required such as normal single POTS line, dual line, dedicated line, etc.

Merritt may know more since he is from your state.