RTD temperature transmitters convert the RTD resistance measurement to a current signal, eliminating the problems inherent in RTD signal transmission via lead resistance.
Errors in RTD circuits (especially two and three wire RTDs) are often caused by the added resistance of the lead wire between the sensor and the instrument.
Transmitter input, specifications, user interfaces, features, sensor connections, and environment are all important parameters to consider when searching for RTD temperature transmitters.
Transmitter input specifications to take into consideration when selecting RTD temperature transmitters include reference materials, reference resistance, other inputs, and sensed temperature.
The transmitter is mounted on the Head of the temperature Sensor & converts it into a linear current loop signal of 4 to 20mA DC, capable of driving a load of up to 600 Ohms.
The instrument operates in two-wire configuration.
Source: Prisma Instruments