Mounting the reed switch perpendicular to the reed switch will have a dramatic effect on the magnetic sensitivity lobes compared to when the magnet is parallel to the reed switch. Now there are four lobes and all are on the ends of the reed switch. Bringing the magnet offset from the switch axis from left to right into the upper first lobe will cause the contacts to close once it reaches the solid line pull-in lobe. Withdrawing the magnet in a similar manner and passing through the dotted drop-out lobe will cause the contacts to open. The magnet when perpendicular to the reed switch will always have to be offset from the axis of the reed switch for closure and opening to occur. Care must be taken when positioning the magnet relative to the reed switch.