What is the difference between the two types of recessed sensor; “V” Type (Small Round) sensor and the “S” Type (Shield Shape) sensor?
There are two main differences, the first is cosmetic; the “V” Type sensors are small and round. The “S” Type sensors are Shield Shape (flat at the top). Because of the shape there is less to dislike about the round “V” Type sensors, hence this makes them the most popular sensor. The second difference is that the “V” Type sensors are slightly more sensitive, making them a better sensor, but this can be a problem if the sensors are mounted below the recommended height of 50cm from the ground or if you are unable to find a vertical surface on the bumper to mount the sensors. The “S” Type Sensors are supplied with a rubber tapered washer that allows more of an upward angle to be achieved, they have been successfully fitted as low as 40cm (although the recommended height is 50cm) from the ground when angled upwards. The Shield (“S” Type) Sensors are better suited if you think there may be the possibility of the system being falsely triggered by being fitted too low.
