TND Stem Thermometer

Brand: KOBOLD Instruments, Inc.

The stem thermometer for diesel engines is a gas pressure thermometer specially designed for the demanding service on diesel engines. The measuring system of the gas pressure thermometer comprises probe, capillary tube and Bourdon spring in a casing.

These parts form a unit. The complete measuring system is filled with pressurized nitrogen.

A change in temperature causes a change in inner pressure in the immersion shaft. The resulting deflection of the Bourdon tube is transferred to the pointer through a pointer element.

The devices are filled with silicone oil and are thus also suitable for service at measuring points exposed to strong vibrations.

The fill dampens the measuring system when exposed to mechanical vibrations and thus enables steady indication; it also provides good lubrication for moving parts.



  • Combustion Gas of Diesel Motors
  • Compressors
  • Cooling Water
  • Turbochargers

BSP Connection

  • G 1/2" A
  • G 3/4" A


  • Aluminum, White with Black Inscription - Dial


  • Brass - Pointer Element

Enclosure / Body Material

  • Black Steel Filled with Silicone Oil or Stainless Steel 1.4301
  • Stainlees Steel Filled with Silicone Oil

Environmental Protection

  • IP67

Sensor / Probe Diameter

  • 0.47" (12 mm)

Sensor / Probe Length

  • 150 mm

Sensor / Probe Material

  • 304 Stainless Steel


  • Dial Size 100 mm
  • Dial Size 63 mm
  • Dial Size 80 mm

Temperature Range

  • 0° to 800° C (32° to 1,472° F)


  • 304 Stainless Steel
  • Steel

Window Material

  • Instrument Glass 4 mm


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