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TW81 1
TW81
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WIKA · Temperature measurement · Family TW

Protection tube

Version per DIN 43734 (EN 50446)
Range
0…1200 °C
Protection
IP65
Price
On request
Depends on configuration
Request a quote
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Description

Each protection tube or thermowell is an important component of any temperature measuring point. It is used to separate the process from the surrounding area, thus protecting the environment and operating personnel and keeps aggressive media, high pressures and flow rates from the temperature sensor itself and thereby enables the thermometer to be exchanged during operation.

Based on the almost limitless application possibilities, there are a large number of variants, such as designs or materials. The type of process connection and the basic method of manufacture are important design differentiation criteria. A basic differentiation can be made between threaded and weld-in protection tubes, and those with flange connections.

The bottom of protection tube model TW81 is either flat or dished, in the case of enamelled protection tubes it is always dished. The protection tube is plugged into the connection head and compression fitted. Additionally, we offer the

Special features

  • Variable length and dimensions
  • Large selection of materials
  • Different process connections
Identification
ModelTW81
Product familyTW
SubcategoryThermowell
Measuring range
Temperature ranges+0…+550 °C · +0…+700 °C · +0…+1150 °C · +0…+1200 °C
Process conditions
Process connection
1 ½ inch, 150 lbs, RF1 ½ inch, 300 lbs, RF2 inch, 150 lbs, RF2 inch, 300 lbs, RF3 inch, 150 lbs, RF3 inch, 300 lbs, RF4 inch, 150 lbs, RF4 inch, 300 lbs, RFG1G 1½G ½G ¾Stop flangeThreaded bushingStop flange/mating flangeFlange connection (welded)
Process temperature+0…+1200 °C
Materials
Probe material1.0305, 1.0305 (enamelled), 1.4571, 1.4841, 1.4762
Thermowell material1.0305, 1.4571, 1.4841, 1.4762, 1.0305 (enamelled), 1.0305 enamelled
Operating environment
IP ratingIP65
Additional details
ThermowellYes
Thermowell formForm 2F
Datasheet languagesEN
Tables from datasheet
Protection tube per EN 50446, modelTW81
Standard nominal lengths A■ 500 mm[19.685 in] ■ 710 mm[27.952 in] ■ 1,000 mm[39.370 in] ■ 1,400 mm[55.118 in] ■ 2,000 mm[78.740 in] Others on request
Materials■ Carbon steel 1.0305 up to 550 °C [1,022 °F] (air), low corrosion resistance to sulphurous gases, medium corrosion resistance to nitrogenous gases ■ Carbon steel 1.0305, enamelled up to 550 °C [1,022 °F], resistance to a max. applied pressure of 1 bar [14.504 psi], for the low pressure range in furnaces and flue gas ducts ■ Stainless steel 1.4571 up to 700 °C [1,292 °F] (air), good corrosion resistance to aggressive media ■ Stainless steel 1.4841 up to 1,150 °C [2,102 °F] (air), low corrosion resistance to sulphurous gases; high corrosion resistance to nitrogenous gases and gases with low oxygen content; high long-time rupture strength ■ Stainless steel 1.4762 up to 1,200 °C [2,192 °F] (air), high corrosion resistance to sulphurous gases; low corrosion resistance to nitrogenous gases Other materials on request
Metal protection tube
Outer diameter in mm[in]Tube thickness in mm[in]
Ø Fs
22 [0.866 in]2 [0.079 in]
15 [0.591 in]2 [0.079 in]
Protection tube outer diameter in mm[in]Dimensions in mm[in]Process connection
Ø f / Ø f 4i min.E
22 [0.866 in]22.5 [0.886 in]20 [0.787 in ]■ G1 ■ G1½
15 [0.591 in]15.5 [0.610 in]20 [0.787 in ]■ G½ ■ G¾ ■ G1
Protection tube outer diameter in mm[in]Dimensions inmm [in]
Ø f / Ø f 4C (hole spacing)
22 [0.866 in]22.5 [0.886 in]70 [2.756 in]
15 [0.591 in]15.5 [0.610 in]55 [2.165 in]
View all (5)
Flange ØMaterial
1 ½inch, 150 lbs, RFStainless steel 316
1 ½inch, 300 lbs, RFStainless steel 316
2 inch, 150 lbs, RFStainless steel 316
2 inch, 300 lbs, RFStainless steel 316
3 inch, 150 lbs, RFStainless steel 316
3 inch, 300 lbs, RFStainless steel 316
4 inch, 150 lbs, RFStainless steel 316
4 inch, 300 lbs, RFStainless steel 316