True Surface Thermocouple (TST)

Increase Thermocouple Accuracy with Improved Thermocouple Design

Watlow's true surface thermocouple (TST) offers superior accuracy for measuring flat surface temperatures. This compact, highly accurate sensor isolates the thermocouple junction from ambient airflow. The TST typically achieves accuracy and repeatability between one to two percent (ΔT). The TST, with its removable molded cover, fits into corners and other tight locations. TSTs are easy to install with a variety of commonly used screw types.

Features & Benefits

Isothermal measuring junction offers excellent thermal conductivity for the measuring junction

Molded insulator isolates the isothermal measuring block from ambient airflow

Compact, universal package easily fits into corners and other tight locations


Optical Res Accuracy Temperature Outside Diameter
up to 400 up to 200 In Cm

Related Documentation

  • Brochures

    Thermal Solutions for Foodservice Equipment

  • Training and Education

    Thermocouple Temperature vs. EMF Tables

  • Catalogs

    Sensor Catalog (Section) - Resistance Temperature Sensors

    Sensor & Controller Catalog

  • Specification Sheets

    TRUE SURFACE Thermocouples

    Thermocouples for General Applications

    Base Metal Thermocouple

    Connector Systems


    Mineral Insulated Thermocouple

    Miniature Thermocouple Connectors

    Noble Metal

    Sensors for High Temperature Heat Treating

    SERIES 5750

    SERIES 5900

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Quality Certificates

ISO 90012008 Certificate - Richmond

ISOIEC 17025 2005 Certificate - Sensors - 1-31-19 Richmond