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You are here → Home > Fittings and Feedthroughs > Pressure and Vacuum Feedthroughs > Series WF

Series WF - Feedthroughs for multiple wires and probes

Pressure and Vacuum Feedthroughs

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When multiple wires must pass through a pressure boundary, series WF feedthroughs can provide an efficient seal without recourse to epoxies or other non-adjustable fixture methods.

Different types of these assemblies may be specified according to the type of element required to pass through the feedthrough. Series WF assemblies cater for up to 12 bare or insulated wires – sizes from 24AWG (0.2mm2) to 8AWG (approx. 8.8mm2).

Insulators within WF feedthrough assemblies protect bare wires and provide additional isolation for Kapton® insulated power wires. These are rated max. 55A @ 600Vdc/850Vac max. Feedthroughs with power wires can be supplied as complete assemblies, ready for installation, with wires cut to specified lengths.

WF feedthroughs can also accommodate up to 12, small diameter sensor elements that must be electrically isolated from each other.
  • Seal on Kapton® insulated copper or thermocouple wires – type WFS
  • Seal on bare wires carrying instrumentation voltages – type WFR
  • Seal on small diameter sheathed sensors, max. 3.2mm dia. – type WFP
  • Pressure range: Vacuum to 700 bar*
  • Temperature range: <-200°C to +870°C*

    * Dependent on sealant and fitting selected
  • 316L Body (and seat where applicable). Follower and cap in 303 or 304
  • Choice of sealant materials
  • Individual wires can be replaced without complete disassembly
  • Reusable fitting – sealant and internal components replaceable
  • A large range of feedthroughs is available to buy online

WFS Series - Body Size, Pressure Guide and available Bore Sizes for BSPT, BSPP and NPT Threads2
Kapton® insulated wires - Max 230°C rated

Body Size No. of
Elements		 Size 1 (1/8") No. of
Elements		 Size 2 (1/4") No. of
Elements		 Size 3 (1/2") No. of
Elements		 Size 4 (3/4")
Sealant
G* L N T V G* L N T V G* L N T V G* L T V
Wire Size The maximum guide pressure value (in bar) at 20°C is shown for each sealant material according to element size1.
These ratings are a guide and the suitability of any of the products described herein for a particular application
is entirely at the discretion of the purchaser as being the best judge for that particular application.
AWG diam. (mm)
24 Cu or T/C 0.5 2, 4 300 400 250 250 250 2, 4 300 400 250 250 250    
20 Cu or T/C 0.8   2, 4 700 700 400 250 450 6, 8, 12 550 550 250 350
18 Cu 1.0
16 Cu 1.3
14 Cu 1.6   4, 6, 8
12 Cu 2.0
10 Cu 2.5   2, 4
8 Cu 3.2   3
Series WFS feedthroughs are supplied with Kapton® insulated copper or thermocouple material wire to specified lengths, if required. The wires are fitted in the feedthrough, both ends of each wire, or Thermocouple pair, are identified with numbered markers and the feedthrough is torqued ready for installation.

* Graftite™ sealants are conductive. Extra care must be taken where high voltages are present. Please contact TC Ltd for further guidance.
  1. The guide pressures shown for each type of sealant are at 20°C. Spectite® feedthroughs from TC Ltd. have been designed to provide an efficient seal on the elements and restrain them from moving under pressure and vacuum. It is good installation practice to provide additional, mechanical restraint to the elements when differential pressure exceeds 50% of the feedthrough guide pressure value at 20°C. With an increase in temperature, a reduction in the maximum guide pressure value can be expected. These ratings are a guide and the suitability of any of the products described herein for a particular application is entirely at the discretion of the purchaser as being the best judge for that particular application.
  2. Other types of process connection are available, see Feedthrough Sizes.

Current ratings for Kapton® insulated copper wire:

Wire Size (AWG) 24 20 18 16 14 12 10 8
Max. current rating (A) at 230°C 600V AC / 850V DC max. 5 9 13 17 24 30 40 55

WFR Series - Body Size, Pressure Guide and available Bore Sizes for BSPT, BSPP and NPT Threads2
Bare wires - Max 230°C rated

Body Size No. of
Wires		 Size 1 (1/8") No. of
Wires		 Size 2 (1/4") No. of
Wires		 Size 3 (1/2") No. of
Wires		 Size 4 (3/4")
Sealant L N T V L N T V L N T V L T V
Wire Size - AWG The maximum guide pressure value (in bar) at 20°C is shown for each sealant material according to element size1.
These ratings are a guide and the suitability of any of the products described herein for a particular application
is entirely at the discretion of the purchaser as being the best judge for that particular application.
24 2, 4 400 250 250 250 2, 4 400 250 250 250    
20
18 2, 3, 4, 6, 8 700 400 250 450
14   2, 4 6, 8, 12 550 250 350
8   2, 4
  1. The guide pressures shown for each type of sealant are at 20°C. Spectite® feedthroughs from TC Ltd. have been designed to provide an efficient seal on the elements and restrain them from moving under pressure and vacuum. It is good installation practice to provide additional, mechanical restraint to the elements when differential pressure exceeds 50% of the feedthrough guide pressure value at 20°C. With an increase in temperature, a reduction in the maximum guide pressure value can be expected. These ratings are a guide and the suitability of any of the products described herein for a particular application is entirely at the discretion of the purchaser as being the best judge for that particular application.
  2. Other types of process connection are available, see Feedthrough Sizes.

WFP Series - Body Size, Pressure Guide and available Bore Sizes for BSPT, BSPP and NPT Threads2
Kapton® insulated wires - Max 230°C rated

Body Size No. of
Elements		 Size 1 (1/8") No. of
Elements		 Size 2 (1/4") No. of
Elements		 Size 3 (1/2") No. of
Elements		 Size 4 (3/4")
Sealant
G* L N T V G* L N T V G* L N T V G* L T V
Wire Size The maximum guide pressure value (in bar) at 20°C is shown for each sealant material according to element size1.
These ratings are a guide and the suitability of any of the products described herein for a particular application
is entirely at the discretion of the purchaser as being the best judge for that particular application.
AWG diam. (mm)
24 Cu or T/C 0.5 2, 4 300 400 250 250 250 2, 4 300 400 250 250 250    
20 Cu or T/C 0.8   2, 4 700 700 400 250 450 6, 8, 12 550 550 250 350
18 Cu 1.0
16 Cu 1.3
14 Cu 1.6   4, 6, 8
12 Cu 2.0
10 Cu 2.5   2, 4
8 Cu 3.2   3
* Graftite™ sealants are conductive. Extra care must be taken where high voltages are present. Please contact TC Ltd for further guidance.
  1. The guide pressures shown for each type of sealant are at 20°C. Spectite® feedthroughs from TC Ltd. have been designed to provide an efficient seal on the elements and restrain them from moving under pressure and vacuum. It is good installation practice to provide additional, mechanical restraint to the elements when differential pressure exceeds 50% of the feedthrough guide pressure value at 20°C. With an increase in temperature, a reduction in the maximum guide pressure value can be expected. These ratings are a guide and the suitability of any of the products described herein for a particular application is entirely at the discretion of the purchaser as being the best judge for that particular application.
  2. Other types of process connection are available, see Feedthrough Sizes.

Enquiry Form

1. Feedthrough Type
2. Thread Size Required

  see table
3. Element Size

 see table
4. No. of Elements

 see table
5. Sealant Type

6. Quantity Required

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