Products

Pressure and Vacuum Feedthroughs for Thermocouples, Sensors and other single elements

Series PF - Feedthroughs

These feed throughs are designed for sealing single elements, usually thermocouple sensors, probes or tubes, where they penetrate a pressure or environmental boundary.

Common applications include sealing sheathed thermocouples and resistance thermometers, small-bore tubes and other types of sensor where they enter a process enclosure.

Series PF feedthroughs seal elements from 0.5mm dia. to 19.05mm (3/4”). There are five body sizes having 1/16”, 1/8”, 1/4”, 1/2” and 3/4” process connections with 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.
  • Seal on probes, sensors, small-bore tubes and other similar elements
  • Immersion length of the element can be easily adjusted
  • Five sizes of feedthrough assembly
  • Designed for easy installation of single elements 0.5mm to 19.05mm (3/4”) diameter
  • 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 five sealant materials
  • Reusable fitting – internal components replaceable
  • A large range of feedthroughs is available to buy online

Body Size, Pressure Guide and available Bore Sizes for BSPT, BSPP and NPT Threads2

Body Size Size 0 (1/16") Size 1 (1/8") Size 2 (1/4") Size 3 (1/2") Size 4 (3/4") Size 5 (1")
Sealant
G L T G L N T V 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
0.020 0.5 650 550 200 450 550 350 200 350        
0.032 0.8
0.040 1.0 550 700 350 500 700
0.059 1.5 150 150 150 500
0.062 1.59
0.080 2.0 450 100 400 450 100 100 550 700 200 200
0.118 3.0 550 700 200 200 550
0.125 3.2
0.157 4.0   350 80 550 125
0.177 4.5
0.187 4.76
0.236 6.0   450 80 550 500 100 400 400 150 55 150
0.250 6.35
0.312 8.0   150 150 450 350 400 250
0.375 9.5 200
0.393 10.0 80 100 350
0.472 12.0   300 75 200 45 40
0.500 12.7
0.625 15.88 200 300 150 100 20
0.750 19.05 30
0.839 21.3  
1.00 25.4
  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.
  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. Thread Size Required
  see table
2. Element diameter

 see table
3. Sealant Type

4. Quantity Required

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© 1998- TC Ltd., P.O. Box 130, UXBRIDGE, UB8 2YS, United Kingdom
Tel.: 01895 252222, Email: info@tc.co.uk
© 1998- TC Ltd., P.O. Box 130, UXBRIDGE, UB8 2YS, United Kingdom
Tel.: 01895252222, Email: info@tc.co.uk