To prevent a ground loop, an isolated signal conditioner is required.Ī decision has to be made to select an isolated or non-isolated signal conditioner. This probe is usually grounded to the device which it is mounted to. Thermocouples may not be connected to anything but the signal conditioner, but they often are welded to the probe which houses the thermocouple. Others can be grounded or isolated, depending on requirements of the system. RTD's, bridges, and potentiometers normally have no connections except to the signal conditioner so they do not need an isolated signal conditioner. Some sensors are commonly inherently isolated. ![]() Strain gauge sensors and thermocouple have millivolt signal levels while AC voltages can be millivolts or hundreds of volts. The most common signals measured are AC voltage, AC current, DC voltage, DC current, RTD, Thermocouple, Frequency, Potentiometer, and Strain Gage (Bridge). Often the only path for the wiring is in a cable trough or in conduit which also carries AC power leads, relay contact leads which switch inductive loads such as relay coils or motors or other potential sources of interference. One of the most complex problems in measuring a signal from a sensor or an electronic product is getting the signal to the final instrument without electrical interference.
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