Thermowells - TW22

Brand: WIKA Instruments Ltd.
The model TW22 thermowell is used to adapt thermometers and measuring inserts to the process and protects the sensor against harsh process conditions. The thermowell is mounted to a weld-in nozzle equipped with a respective hygienic connection and is built in pipelines and tanks.
Features
  • Materials and surface finish quality in accordance with the standards of hygienic design. 
  • Fully welded. 
  • Can be combined with models TR21-A and TR22-A electrical resistance thermometers, measuring insert exchangeable . 
  • Can be combined with mechanical thermometers, resistance thermometers and DiwiTherm®.
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The model TW22 thermowell is used to adapt thermometers and measuring inserts to the process and protects the sensor against harsh process conditions. The thermowell is mounted to a weld-in nozzle equipped with a respective hygienic connection and is built in pipelines and tanks.
Features
  • Materials and surface finish quality in accordance with the standards of hygienic design. 
  • Fully welded. 
  • Can be combined with models TR21-A and TR22-A electrical resistance thermometers, measuring insert exchangeable . 
  • Can be combined with mechanical thermometers, resistance thermometers and DiwiTherm®.

Specifications

Thermowell materials (wetted)

  • Stainless steel 1.4435 (316L, UNS S31603)

Surface roughness of Wetted Parts

  • Ra < 0.76 µm (SF3 per ASME BPE)
  • Option:
  • Ra < 0.38 µm (SF4 per ASME BPE)
  • Ra < 0.38 µm electropolished (SF4 per ASME BPE)

In Combination with Model TR21-A

  • G ⅜" fixed

In Combination with Model TR22-A

  • M24 x 1.5 male nut (rotatable)
  • Option:1/2" NPT, fixed

In Combination with Models TG54 Oder 55

  • M24 x 1.5 male nut (rotatable)
  • G ½ female
  • 1/2" NPT Female
  • (Option only for design S (fixed), design 2 (rotatable threaded connection), design 4 (compression fitting), design 5 (union nut and loose threaded connection)

In Combination with Models 73 (Design 3 / Union Nut) or TR75 (DiwiTherm®)

  • M24 x 1.5 male nut (rotatable)

Models TR21-A or TR22-A

  • Ø 4.5 mm for Ø 3 mm sensors (quick responding, only insertion length U1 ≤ 25 mm)
  • Ø 6 mm tapered to Ø 4.5 mm for Ø 3 mm sensors (quick responding)
  • Ø 6 mm for Ø 3 mm sensors

Models TG54, 55, 73 or TR75 (DiwiTherm®)

  • Ø 12 x 1.5 mm for Ø 8 mm sensors
  • Ø 8 x 0.9 mm for Ø 6 mm sensors

Neck Tube Length M

  • 85 mm

Neck Tube Diameter

  • Models TR21-A or TR22-A
  • Up to DN 20: 9 mm (except per DIN 11851 (milk thread fitting): 12 mm)
  • From DN 25: 12 mm
  • Models TG54, 55, 73 or TR75 (DiwiTherm®)
  • Same diameter as the thermowell diameter

Insertion Length U

  • 25 mm
  • 50 mm
  • 75 mm
  • 100 mm
  • 150 mm
  • 200 mm
  • Option: up to 400 mm according to customer specification

Typical Applications

  • Sanitary applications
  • Food and beverage industry
  • Bio and pharmaceutical industry, production of active ingredients

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