Have a 2 small safes (Chubb at home) as we have important documents and antiques. 
I installed an alarm for the house a few years ago and now am trying to install a safe limpet. 
elmdene e20 limpets I have bought these. 
I fitted them on the safe. One safe works perfectly as it should the other safe randomly after 5min or 40min will cause an “alarm”/ circuit going active and then back to normal. 
what is the problem here

11 minutes ago, Intermec said:

what is the problem here

 

problem could be cable, device or controls ?

 

cable - measure it from the zone used (controls, expander or keypad) check the terminations at device, zone & any joint box ect...

 

device - either wired up wrong, set up wrong, effected by the environment eg- this unit senses vibration of the back door slamming (or whatever ?) , or you might have a duff item

 

controls - the zone could be fcuk'd ?

 

That's the best my Psychic abilities can offer....

 

It could be anything as above.

From my experience with them they can FA if they get bounced on the floor by accident.

I assume these are new and you haven't dropped them at any point?

Isolate the circuit from the device to prove the controls and wiring, then swap the working with the suspect to rule out the device.

Another thing I found was if the magnetic feet have twisted this can cause them to false alarm. Make sure the feet are tight too. Other than that same as previous comments