The Welker Automatic Insertion Temperature Probe is designed for use in operations where it is necessary to determine pipeline temperature for measurement or analysis. The design of the unit allows the operator to control the movement of the probe into and out of a pressurized pipeline safely by utilizing pipeline pressure and manipulating four valves. The unit should be installed in a straight Section of piping before the flowing stream is subjected to turns and impingements that can result in turbulent flow. A terminal at the top of the device is connected to the RTD sensor at the bottom of the probe. The RTD sensor transmits the data to the terminal strip that is mounted in an explosion-proof junction box.