Replacing external sounder on older system

[btb23]

The house has a 'Conqueror' alarm system as installed by the builders in 1997. The external sounder battery is flat and worn out again (I replaced it once already a few years back), and I'm thinking to just replace the sounder this time with something like a Pyronix Deltabell Plus.

I've come across the options of a grade 2 or 3, is it just that grade 3 has better tamper options and if so would it be a suitable replacement?

Is the Pyronix Deltabell Plus a good choice?

Thanks for any advice.

 

[sparkymarka]

Grade 3 will have no use on your system so don’t pay extra for something you can use .... delta bell is fine

 

[Handymanjo]

The grade of equipment is for insurance approved alarm systems.
A grade 3 product will have inputs for monitoring faults.
Your pyronix system is ungraded due to age of equipment.
Just change the bell box for a new version.
Take photo of old wiring before you swap as this helps when reconnecting new bell box.

 

[btb23]

Many thanks for both replies.

I'll follow advice and get a grade 2 and be sure to photo old wiring.