Choosing the right temperature transmitter is crucial for ensuring precise and stable measurements in industrial, laboratory, or commercial applications. A well-selected temperature transmitter enhances the accuracy of data acquisition and ensures proper integration with control systems. This guide will help you understand the factors to consider when selecting a transmitter and provide an overview of the most versatile models available on the market.

What Is a Temperature Transmitter?

A temperature transmitter converts the signal from a temperature sensor (such as a thermocouple or RTD) into a standard output signal—typically 4–20 mA or 0–10 V. This signal is then used by control systems like PLCs, data loggers, or SCADA systems. Modern transmitters often offer digital communication via protocols such as MODBUS-RTU.

Key Factors When Choosing a Temperature Transmitter

  • Type of temperature sensor (RTD, thermocouple, semiconductor)
  • Number of wires in the sensor connection (2, 3, or 4-wire)
  • Output signal type (analog or digital)
  • Mounting type (DIN rail, head-mount)
  • Communication interface (e.g., RS485, MODBUS-RTU)
  • Galvanic isolation
  • Linearity correction and CJC compensation

Examples of Temperature Transmitters

TMD-11 Digital Temperature Transmitter

  • Supports Pt100 or Ni100 sensors
  • 2, 3, or 4-wire sensor connection
  • High measurement accuracy
  • RS485 interface with MODBUS-RTU
  • Works with up to 247 transmitters on a single bus
  • DIN rail mounting (EN 50022-35)

TMD-21 Digital Temperature Transmitter

  • Supports thermocouples: J, K, N, T, E, S, R, B
  • RS485 with MODBUS-RTU
  • Galvanic isolation of input, power, and interface
  • CJC and sensor linearization
  • Status and communication LED indicators

TED Programmable Temperature Transmitter

  • Output: 4–20 mA or 0–10 V
  • Galvanic isolation on selected models
  • Configurable input type: Pt100, Ni100, J, K, N, S, R, B, T
  • 2, 3, or 4-wire sensor connection
  • DIN rail mounting

TCD Temperature Transmitter

  • Output: 0–20 mA, 4–20 mA, or 0–10 V
  • Supports Pt100 and thermocouples
  • 2 or 3-wire RTD connection
  • Optional sensor linearization and CJC

TBD Temperature Transmitter

  • Output: 0–20 mA, 4–20 mA, or 0–10 V
  • Galvanic isolation
  • Supports Pt100 and thermocouples

TEH Programmable Temperature Transmitter

  • Output: 4–20 mA or 0–10 V
  • Galvanic isolation (on selected models)
  • Programmable input type
  • Head-mount for type B heads

TCH and TCHF Temperature Transmitters

  • Output: 4–20 mA or 0–10 V
  • Supports Pt100 and thermocouples
  • 2 or 3-wire sensor connection
  • Head-mount versions

TEHM and TCHM Transmitters

  • Output: 4–20 mA
  • Loop-powered
  • Supports wide range of sensors
  • Head-mount for type MA heads

Conclusion

Selecting the right temperature transmitter depends on the application, sensor type, signal requirements, and installation environment. Whether you need a simple analog transmitter, a programmable model with galvanic isolation, or a digital unit with MODBUS-RTU, there is a solution to match your needs. Our wide selection of transmitters ensures compatibility with most industrial temperature sensors, offering reliability, accuracy, and flexibility.