Sensor Protection Sheaths and Housing Designs

Housings and sheaths for temperature sensors

Our temperature sensors are specifically designed for many different types of harsh and reducing atmospheres and therefore we supply protection sheaths suitable for each application.

Consideration needs to be given to:

  • The maximum and normal running temperature of a process
  • Any chemical attack present
  • Physical knocks or vibration in use (including carriage and plant handling)
  • Protect the sensor from contamination
  • Maximum design pressure
  • Abrasion resistant
    The connection of the sensor to the plant or equipment
  • If the sensor is to be replaceable within the protection sheath

Sheaths suitable to the application

At low temperatures PVC, Silicon rubber, FEP, PFA or PTFE (polytetrafluroethane / teflon) sheaths are common to 260°C. Above this stainless steel and other metal alloys are used. For high temperatures ceramic is used. Common ceramics include: Pythagoras, Alsint / Recrystalised Alumina (RA), Aluminous and Impervious Aluminous Porcelain (IAP). Platinum Rhodium alloy sheaths are used for immersion into glass.

Molten aluminium temperature sensors can utilise cast iron due to its cheapness and adequate chemical resistance. Chemical plants can demand Inconel (and other Nickel alloys), Monel Hastelloy or a range of fabricated coatings such as tantalum. Mineral insulated designs incorporate the conductor within a metal thermocouple sheath (Usually Stainless Steel or Inconel Alloy 600) held apart with a compacted ceramic powder. This forms the most robust and tough sensors available. Overall sizes down to 0.25mm diameter is possible. The sensor is virtually indestructible except through over temperature exposure. The unit can be formed to almost any shape to suit an application including tip diameter reduction to decrease response time. Compression glands can easily be used with mineral insulated thermocouple and resistance thermometer (RTD) sensors to provide sealing. Process fittings can include fixed or moving threads and flanges.

Thermocouple Protection Sheath Designs

The length, design, diameter, bore and materials of the protection sheaths can vary according to your personal requirements.

Detailed material information can be found on our protection sheath materials page.

Below are examples of protection sheath designs we can supply.

Click on the links to view individual protection sheath datasheets.

Ceramic Protection Sheaths

Ceramic Protection Sheath With Platinum Thimble & Head

Ceramic Protection Sheath With Platinum Thimble & Head

Ceramic Protection Sheath With Shank and Head

Ceramic Protection Sheath With Shank and Head

Ceramic Protection Sheath

Ceramic Protection Sheath

Ceramic Protection Sheath With Shank

Ceramic Protection Sheath With Shank

Solid Drilled Pockets

Solid Drilled Pocket with Flange

Solid Drilled Pocket with Flange

Solid Drilled Pocket with Process Thread

Solid Drilled Pocket with Process Thread

Solid Drilled Pocket with Stub Flange

Solid Drilled Pocket with Stub Flange

Solid Drilled Pocket – Weld In

Solid Drilled Pocket—Weld In

Fabricated Metal Protection Sheaths

Fabricated Metal Protection Sleeve with Head

Fabricated Metal Protection Sleeve with Head

Fabricated Metal Protection Sleeve for Air Sensors

Fabricated Metal Protection Sleeve for Air Sensors

Fabricated Metal Protection Sleeve with Flange

Fabricated Metal Protection Sleeve with Flange

Fabricated Metal Protection Sleeve with Process Thread

Fabricated Metal Protection Sleeve with Process Thread

Fabricated Metal Protection Sleeve with Reduced Tip

Fabricated Metal Protection Sleeve with Reduced Tip

Fabricated Metal Protection Sleeve

Fabricated Metal Protection Sleeve

Right Angle Metal Protection Sleeve

Right Angle Metal Protection Sleeve

View our temperature sensors

Rare Metal Thermocouples

Base Metal Thermocouples

Base Metal Cable Thermocouples

Cable Resistance Thermometers

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