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 Shank and Head
Ceramic Protection Sheath
Ceramic Protection Sheath With Shank
Solid Drilled Pockets
Solid Drilled Pocket with Flange
Solid Drilled Pocket with Process Thread
Solid Drilled Pocket with Stub Flange
Solid Drilled Pocket – Weld In
Fabricated Metal Protection Sheaths
Fabricated Metal Protection Sleeve with Head
Fabricated Metal Protection Sleeve for Air Sensors
Fabricated Metal Protection Sleeve with Flange
Fabricated Metal Protection Sleeve with Process Thread
Fabricated Metal Protection Sleeve with Reduced Tip
Fabricated Metal Protection Sleeve
Right Angle Metal Protection Sleeve
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