Help with fail safe (closed) circuit schematic

[1geo]

I have the need for an alarm when house power fails. I purchased a sump alarm which trips on high water. The sump alarm probe is normally (low water) open. When water rises it closes and the alarm goes off. I want to substitute a normally open ciruit when house power is applied which closes on house power failure hence the sump alarm goes off sensing a high water level. Can any one help me with a simple fail safe circuit schematic? Thanks Geo.

 

[dick_freebird]

All you need is an AC SPDT relay, use NC contacts and
you will connect {whatever} when power drops.

 

[1geo]

I just ordered a 120V AC SPDT Relay. Thanks for the information. Geo.

 

[1geo]

I got the relay in the mail and it was an easy job hooking it up. It works like a charm. My thanks to dick_freebird for the suggestion. Geo.