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.
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 20 MA.
Industrial applications use a wide array of sensors to measure temperature, flow, length, speed 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) can be converted to any standard process signal.
Omni Series Products
SL408 OmniSLIM Isolated Converter
Isolation and conversion of standard DC signals
Slimline housing of 6 mm
Power supply and signal isolator for 2-wire transmitter
Loop supply >17 V
SL408-B OmniSLIM Bi-Polar Isolated Converter
Conversion of voltage and current bipolar process signals to unipolar signals
Multiple signal ranges are selectable via DIP-switches
Fast response time < 7 ms and high output load stability
Excellent accuracy, better than 0.05 % of selected range
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