Why doesn VEMCO specify pressure accuracy for sensor tags across temperature ranges?
Background VEMCO developed the pressure sensor line of transmitters in response to customer demand for a low cost means of determining relative depths of tagged animals. Two important constraints are thusly placed on the sensors: • Physical size: the sensor and associated hardware and processing elements must fit within the general physical dimensions of the existing transmitters (9mm, 13mm and 16mm diameters) • Cost: the cost of the sensor and associated processing hardware and algorithms must not drive the cost of the transmitter excessively high. Discussion For the purposes of application in VEMCO transmitters, pressure sensor errors are dominated by non-linearity in readings across the pressure range and changes in the pressure sensing characteristic at various temperatures. Although pressure sensors are available on the market that have excellent linearity and temperature compensation, they are expensive (>$1,000) and typically much too large to fit in even a V16 package. The pres
