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Different functions in signal conditioning
A ground loop can occur if more than one ground connection is made to a single control signal. Because grounds are seldom at the same potential, an unwanted current will be generated and
interfere with the control signal. Signal isolators break the ground loop current path and maintain the integrity of the measurement.
Industrial applications use a wide array of sensors to measure temperature, flow, length, speed, frequency, etc. These signals may then need to be converted into a form usable by the instrumentation to which they are connected. Any sensor signal (thermocouple, RTD, DC voltage, DC current, AC voltage, frequency, resistance, etc.) can be converted to any standard process signal.
Isolators incorporate low pass filters that eliminate high frequency EMI/RFI and unwanted signals from power lines,
generators and motors.
Many sensors output a signal that is not linearly related to the engineering value being measured. For example, a
thermocouple used to measure temperature has a nonlinear millivolt output. A thermocouple input signal isolator translates this to a standard, robust linear signal such as 4 to 20mA.
Limit alarm units take in a process signal and compare it to one or more setpoints. They then provide an output signal, usually a relay contact, when the signal crosses the setpoint.
Isolators that can perform addition, subtraction, multiplication, division, square root, and averaging.
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