All existing and new products that contain a QBT sensor require specification changes to ensure making proper measurements over time. These changes include warm up time, zeroing frequency, and measurement specifications.
These products include 7050, 7250, 7250i, 7250xi, 7250LP, 7252, 7252i, and 7750i pressure controllers/monitors.
Full details are included in the attached customer letter and user manual supplements ...