2 Wire Rtd configuration
Two Wire RTDs- The two wire RTD is the simplest RTD wire configuration. One wire is attached to each side of the element. A measure can be taken by any device equipped to measure resistance, including basic volt Ohm Meter. This is the least accurate way of measuring temperature, due to the fact that the lead wire resistance is in series with the sensing element. The lead wire is at a different temperature than the sensing element and also has a different resistance verses temperature characteristics. The longer the lead wire the greater the effect on the temperature measurement. A typical two wire configuration looks like the following: 