Anti tampering arrangement and method for detecting tampering with a device

摘要

1. The present invention relates to an arrangement for determining a degree of ozone conversion of an ozone converting member (4) in a vehicle. The arrangement comprising at least the catalytic conversion member (4) being able to reduce ozone of the ambient air. The arrangement comprises an anti-tampering device (20) for preventing tampering of the arrangement. The anti-tampering device (20) being provided on the catalytic conversion member (4) and comprises at least one temperature sensor (8) for measuring the temperature of the catalytic conversion member (4). The anti-tampering device (20) comprises means for determining if at least one predetermined condition regarding the functionality of the arrangement is fulfilled in order to indicate tampering of the arrangement. The present invention also relates to a method for preventing tampering of such an arrangement.