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WirelessHART (WH) is a recently standardized wireless fieldbus. The connection between WH and the host plant network is obtained with Access Points and Gateways. These devices have complex (and costly) architecture, but do not offer flexibility with respect to new update of the specification, and have limited diagnostic capabilities. In this paper, the architecture of a smart WH Access Point, which...
In this paper, we propose a low-voltage (LV) low-power (LP) oscillating circuit suitable for the read-out of DC-excited resistive gas sensors, based on Second Generation Current Conveyors (CCIIs). This low-cost fully integrable front-end is able to evaluate the resistive behavior of gas sensors, without any preliminary calibration, operating a Resistance to Time ( R-T) conversion and exciting the...
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