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

Series PSF and MSF- Split Feedthroughs for single and multiple elements

Pressure and Vacuum Feedthroughs

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Series PSF (single element) and MSF (multiple elements) feedthroughs are similar to series MF feedthroughs, but have split internal components.

This permits elements, that have a larger diameter section other than at the sealing point and can pass through the feedthrough body but not through the internal components, to be installed easily. Examples are probes with fitted connectors and sensors with pot seals or bulbs.

There are three body sizes having 1/4”, 1/2” and 3/4” process connections in either BSPT (conical gas or DIN 2999 ‘R’) and NPT threads.

Spectite® feedthroughs are designed for ease of assembly and installation. Elements can be adjusted, removed and replaced when not under pressure or vacuum conditions.
  • Individual elements can be replaced without complete disassembly
  • Internal components – follower, sealant and seat are split to allow easy installation of elements with fitted connectors or large diameter sections.
  • Designed to carry single elements 1.0mm to 12.7mm dia., and multiple elements 1.0mm to 6.35mm dia.
  • 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
  • Immersion length of each element easily adjusted
  • Reusable fitting – internal components replaceable
  • A large range of feedthroughs is available to buy online

PSF Series (single slement) Body Size, Pressure Guide and available Bore Sizes for BSPT, BSPP and NPT Threads2

Body Size Size 2 (1/4") Size 3 (1/2") Size 4 (3/4") Size 5 (1")
Sealant
G L N T V G L N T V G L T V G L T V
Element Sizes (dia)3 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.
inches mm  
0.040 1.0 480 480 300 210 450      
0.059 1.5
0.062 1.59
0.080 2.0 480 610 180 80 180
0.118 3.0 500 670 100 100 100
0.125 3.2
0.157 4.0 260 590 100 50 150
0.177 4.5
0.187 4.76
0.236 6.0 230 500 80 40 120 330 100 130 50 140 50 100 20 100
0.250 6.35
0.312 8.0   70 90 80 60 80 30 40
0.375 9.5 300 500 60 80 30
0.393 10.0 30 50 20 20
0.472 12.0   50
0.500 12.7
0.625 15.88  
0.750 19.05

Series MSF (multi element) Body Size, Pressure Guide and available Bore Sizes for BSPT, BSPP and NPT Threads2

Body Size No. of
Elements		 Size 2 (1/4") No. of
Elements		 Size 3 (1/2") No. of
Elements		 Size 4 (3/4")1 No. of
Elements		 Size 5 (1")
Sealant
G L N T V G L N T V G L T V G L T V
Element Sizes (dia) 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.
inches mm
0.040 1.0 2 to 3 400 550 200 200 200 2 to 5 550 550 300 200 350 2 to 9 450 450 250 300  
0.059 1.5 150 150 2 to 4 2 to 7 200
0.062 1.59
0.080 2.0 2 2 to 3 2 to 6
0.118 3.0 100 2 270 150 300 2 to 4 270 5 150 100 80 100
0.125 3.2
0.177 4.5   250 100 200 2 to 3 300 100 200 4 100 55 55 30
0.187 4.76  
0.236 6.0 2 3
0.250 6.35 2
  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.
  3. The element diameters shown are the common sizes routinely demanded for general industrial applications. Other sizes can be supplied between the minimum and maximum diameters shown.

Enquiry Form

1. Feedthrough Type
2. Thread Size Required

  see table
3. Element diameter

 see table
4. No. of Elements (MSF only)

 see table
5. Sealant Type

6. Quantity Required

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