Well I got a reply to my email from Kaymar, this is what they said.
Hi Barry
We have an aluminium shield supplied with our carrier to deflect the sensor.
The sensors can and do move with their housing and this can cause problems with them going off.
All the product we have fitted here at our factory – we have had no problems with the sensors going off.
As always fitting is our biggest problem – mis interpreting the instructions (we have as many photos as possible to assist) and those that don’t read the instructions at all.
Often it is not even a mm that makes all the difference.
Feedback from our customer to let us know of any problems is another problem as you mention talk over forum etc that we have a problem with the sensors but we have only had a few with issues contact us and most have not fitted the shield and once this is fitted we have not heard anymore and can only assume all is fine.
Hope this helps those having problems.
If you have a problem let them know, nicely of coarse.
Baz.

