Analog transmitter is a field-mounted device that senses a physical parameter such as pressure or temperature and generates a current proportional to the measured variable in the standard range, 4 to 20 mA. Providing the output as a current in a twisted-pair loop has many advantages. The measurement signal is insensitive to noise and is not affected by changes in loop resistance. The transmitters meeting the standard are interchangeable and the power required to energize the transmitter circuits can be derived from a remotely supplied loop voltage.
Analog Transmitters are used when a 4-20 mA signal is desired. Analog transmitters measure humidity and temperature. Analog transmitters provide signal conditioning, amplification and a corresponding digital or isolated analog output signal for tank/bin/hopper weighing systems. Analog transmitters are flexible, high-performance devices for use with all strain gage-based transducers.
Analog vacuum gauges are devices for measuring vacuum or sub-atmospheric pressures. It uses different technologies such as manometers are made of a transparent U-shaped tube and filled with a liquid such as water, mercury or oil. It requires an analysis of display & scale types and scale units. Analog vacuum gauges features signal outputs and communication protocols. It includes temperature measurement outputs to prevent measurement errors due to changes in temperature.
Analog metric cameras are often used for taking aerial images to get a high resolution. Therefore this camera is analyzed offline with a scanner. The image is scanned with a high resolution. The strategy is very time consuming and requires much memory. These cameras in conjunction with an offline scanning process are applied by the taking of aerial images, because these images often have the size of 23 x 23 cm2.