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| Hedland receives a patent on its flow transmitter Hedland received a US Patent on its MR Flow Transmitter. The new design avoids consuming too much power by activating only portions of the Anisotropic Magnetoresistive, AMR, array electronics in a systematic way. MR Transmitter does not power all of the MR sensors at once. The microprocessor selects and reads the output voltage of seven AMR sensors, one at a time, until the entire array of sensors have been read. This voltage is routed through a multiplexing circuit and then into an instrumentation amplifier. The signal is amplified, passed through a low pass filter and then input to the A/D converter built into the microprocessor. Based on the readings, the microprocessor determines the absolute position of the magnet inside the flow meter, and calculates the flow rate based upon user selectable setup scaling parameters. The flow rate is then displayed on the LCD display. The unit can also calculate and display the total accumulated flow. Analog outputs of 4-20mA current loop, 0-5Vdc and 0-10 Vdc are provided. These outputs are calibrated to output an analog current or voltage corresponding to the measured flow rate. The MR Flow Transmitter also has the ability to enter up to 10 linearization points to compensate for the non-linearity of the flow meter. write your comments about the article :: © 2007 Construction News :: home page |