Certain embodiments described herein are directed to ion detectors and systems. The assembly includes a housing, a locking element and a band. The display is spaced rearwardly of the bezel to define a light transmitting aperture. This reduces the risk of a rupture in the gas tubing from electrical insult, which could result in fire. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of such diseases in which CGRP is involved.