This document describes a temperature transmitter that uses an advanced microcontroller to measure temperature from RTD or thermocouple sensors. It provides automatic cold junction compensation for thermocouples, has 0.5% accuracy for thermocouples and 0.2% accuracy for PT-100 RTDs, and outputs a 4-20mA signal proportional to the temperature through a current loop with up to 600 ohm load capacity. The transmitter can be head or DIN rail mounted and operates on a 12-36VDC power supply.