Provided are a method, system, and article of manufacture for detecting data integrity. The tip actuator mechanism includes an actuator knob rotatably attached to the instrument head in which the instrument head includes annular securement slots sized for receiving external engagement features of a speculum tip element which are rotatably fitted into the slot. A sequence of relatively low resolution images nominally of the same scene is also acquired. Next, the container is tilted by >90 along with the mail pieces and the holding supports. A first gas sensor is upstream of the OC and a second gas sensor is downstream of the SCR catalyst. The second ramp signal corresponds to a second phase.