What is a temperature transmitter?

The temperature transmitter converts a thermocouple or RTD signal to a 4-20 mA output signal and is an ideal solution for many remote temperature measurement applications.4-20ma transmitters offer clear advantages over traditional temperature measurement equipment, but must be carefully selected to avoid "ground loop" problems.

Why use a temperature transmitter?

In many cases, it is necessary to monitor the temperature of a remote process.Common temperature sensing devices such as thermocouples and RTDs produce a very small "signal".These sensors can be connected to a two-wire transmitter that will amplify and condition the small signal.Once at a usable level, the signal can be transmitted over plain copper wire and used to drive other equipment such as meters, data loggers, chart recorders, computers or controllers.

How to use a temperature transmitter? 

The temperature transmitter draws a current proportional to its sensor input from a remote DC source.The actual signal is transmitted as a change in supply current.Specifically, a thermocouple input transmitter will draw 4 mA from the DC source when measuring the lowest temperature of the process.Then, as the temperature increases, the thermocouple transmitter will draw proportionally more current until it reaches 20 mA.This 20 mA signal corresponds to the maximum temperature sensed by the thermocouple. The transmitter's internal signal conditioning circuitry (powered by a fraction of the 4-20 mA current) determines the temperature range represented by the output current signal.Physically, only two copper wires are required to connect the temperature transmitter output signal in a series circuit to remote power and process equipment. This is possible because the signal and power lines are combined (one circuit with double function).

Choose the right temperature transmitter

Compact M12 RTD Transmitter.This unique probe is ideal for space-constrained areas where conventional head connections are too large to fit. M12 thread design provides a secure industrial connection.

Smart Temperature Transmitter

This smart head transmitter accepts a thermocouple temperature sensor and converts the sensor output within a configured range to a standard industry (4 to 20 mA) transmission signal.

DIN rail temperature transmitter

The TXDIN1600 series is a new generation of DIN rail mount temperature transmitters.It is designed to accept the most common process and temperature sensor inputs and provide the user with a standard two-wire 4 to 20 mA output signal. Isolation is provided between the input and output, and all temperature ranges are linear with temperature.