Devices and methods utilizing dielectric pumping and variable dielectric pumping to move fluids through microchannels. The air gap may itself be extended in length using an upper or lower lip, or both. In an exemplary embodiment, the system may be further operable to migrate the application IP address to a new host as part of a migration, and alias the application IP address to a NIC in the new host as part of the migration. The method comprises the computation of at least one calibration coefficient connecting the property to the or each piece of information received from the sensor, based on the first piece of information and the second piece of information.