Pressure and Vacuum Sealed Feedthroughs from TC Ltd.
01895 252222 | info@spectite.co.uk

Series PF Single Sensor Pressure and Vacuum Feedthrough with Threaded Extension

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

The threaded extension (B- cap) allows for connection to a terminal head or conduit at the opposite end to the process.

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 25.4mm dia. There are six body sizes (0 to 5) having 1/16", 1/8", 1/4", 1/2", 3/4" and 1" process connections with BSPT (conical gas or DIN 2999 'R') and NPT threads along with ISO, SAE and UNF threads as shown in the Feedthrough Sizes section.

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 as required
  • Six sizes of feedthrough assembly
  • Designed for easy installation of single elements 0.5mm to 25.4mm diameter
  • Guide pressure range: Vacuum up to 700 bar
  • Temperature range: -200°C to +870°C
  • 316L Stainless steel wetted parts (see Cutaway View)
  • Choice of five sealant materials
  • Reusable fitting (dependant on sealant)
  • Reusable and replaceable internal components
  • ATEX / IECEx Approved versions to Ex II 2 GD, Ex d IIC Gb / Ex e IIC Gb, Ex ta IIIC Da available, please contact us for more details
Threaded Extension ('B' Cap) Weld Neck Flanges
Allows the gland to be terminated into the process as well as to a terminal head or conduit at the opposite end to the process. Supplied without thread for permanent installation into the process by welding. For termination to a mating flange within the process, see Optional Flanges for details of the flanges available as standard.
Size 0 (1/16" Thread or equivalent) Size 1 (1/8" Thread or equivalent) Size 2 (1/4" Thread or equivalent)
Standard Thread Sizes Max. Tube Size Standard Thread Sizes Max. Tube Size Standard Thread Sizes Max. Tube Size
1/16" BSPT, 1/16" BSPP, 1/16" NPT 3.2mm 1/8" BSPT, 1/8" BSPP, 1/8" NPT 4.76mm 1/4" BSPT, 1/4" BSPP, 1/4" NPT 6.35mm
Alternative Thread Sizes Max. Tube Size Alternative Thread Sizes Max. Tube Size Alternative Thread Sizes Max. Tube Size
M4x0.7, 1/4" SAE-20, 1/4" UNF-28 2.0mm M8x1.0, 3/8" UNF-24 4.76mm M10x1.0, 7/16" UNF-20 6.35mm
M5x0.8 2.0mm M10x1.0, 7/16" UNF-24 4.76mm M12x1.5, 1/2" UNF-20 6.35mm
M6x1.0 3.0mm        
 
Size 3 (1/2" Thread or equivalent) Size 4 (3/4" Thread or equivalent) Size 5 (1" Thread or equivalent)
Standard Thread Sizes Max. Tube Size Standard Thread Sizes Max. Tube Size Standard Thread Sizes Max. Tube Size
1/2" BSPT, 1/2" BSPP, 1/2" NPT 10.0mm 3/4" BSPT, 3/4" BSPP, 3/4" NPT 19.05mm 1" BSPT, 1" BSPP, 1" NPT 25.4mm
Alternative Thread Sizes Max. Tube Size Alternative Thread Sizes Max. Tube Size Alternative Thread Sizes Max. Tube Size
3/8" BSPT, 3/8" BSPP, 3/8" NPT 10.0mm M22x1.5, 3/4" SAE-16, 7/8" UNF-14 19.05mm M27x2.0, 1+3/16" SAE-12, 1" UNF-14 25.4mm
M14x1.5, 7/16" SAE-20, 9/16" UNF-18 10.0mm M24x2.0, 7/8" SAE-14, 1" UNF-14 19.05mm M33x2.0, 1+5/8" SAE-12, 1+1/8" UNF-14 25.4mm
M16x1.5, 1/2" SAE-20, 5/8" UNF-18 10.0mm        
M20x1.5, 9/16" SAE-24, 3/4" UNF-16 10.0mm        
 
Sealant Material Code Colour Example Operating Temperature Range Re-usable Material definition and properties
Neoprene N Green -40°C to +90°C Yes Synthetic rubber based on polychloroprene. The elastic properties of the polymer are enhanced by vulcanization. It is much more resistant to heat, light, oxidation, and petroleum than ordinary rubber.
Viton® V Brown -40°C to +225°C
(intermittently to +285°C)
Yes

Fluoroelastomer. Resists hydrocarbons, corrosive chemicals and petroleum. Solvent, acid and base resistant. Low permeation rate. Mechanically robust at high temperatures.

PTFE T White -200°C to +250°C Yes Polytetrafluoroethylene. FDA approved grade to Title 21-CFR 17. 1550 and is approved to US Pharmacopoeia Class VI. Has smooth, non-wetting, hydrophobic surfaces that resist biofilm buildup and the lowest coefficient of friction of any solid material. Low thermal transfer.
Graftite™ G Grey / Black -200°C to +550°C
(to +870°C in a reducing atmosphere)
No Graphite 98% purity. Impermeable to gases and liquids. Resistant to most media, not 'wetted' by molten metals or salts. Asbestos-free. No ageing or embrittlement. Good resistance to thermal shock. Conductive material (not electrically isolated).
Lava L Grey Stone -200°C to +870°C No

Natural Magnesium Silicate (Soapstone, Steatite or Rock Talc). Crushes to a powder when compressed. Hygroscopic. Porous to light gases. Unsuitable for use with liquid media and in most vacuum applications.

Other sealant materials may be specified, usually for the individual special requirements of particular applications. Please contact us for assistance.
Style 'B' (Alternative cap) Description

Standard Fitting with a Style B threaded extension for conduit/terminal head or enclosure connection. The thread form is the same as the process thread unless otherwise specified.

If a different thread form is required, please specify after the 'B' in the order code, for example:
PF1 - 1/8" BSPP - 1.5 - G - B NPT

If a B cap is used with a weld neck fitting, then the thread form must be specified.

Style Example Part Code Maximum Compatible
Body Size
Outside
Diameter
Thickness
KF FLANGE KF16 Size 2 30mm 5.08mm
KF25 Size 3 40mm 5.08mm
KF40 Size 5 55mm 5.08mm
KF50 Size 5 75mm 5.08mm
CF FLANGE DN16CF Size 3 33.8mm 7.6mm
DN25CF Size 4 54.0mm 11.9mm
DN35-40CF Size 5 69.9mm 12.7mm
DN50CF Size 5 85.7mm 16.0mm
DN63CF Size 5 114.3mm 17.3mm
All flanges are supplied in 304L stainless steel as standard. Hygienic and Food Grade Flanges are also available - please contact us for further details.
CF Flanges are non-rotatable (fixed) type and comply with ISO3669-2017.
KF Flanges are compatible to the ISO Standard 2861 Specification.
Many other styles of flange available on request (DIN, JIS, ANSI, etc.), contact TC Ltd. for details.

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.
Size 0 (1/16" Thread or equivalent) Size 1 (1/8" Thread or equivalent) Size 2 (1/4" Thread or equivalent)
 
Size 3 (1/2" Thread or equivalent) Size 4 (3/4" Thread or equivalent) Size 5 (1" Thread or equivalent)
Please note: the overall length will vary slightly depending on the sealant used and the tube size.

Enquiry Form - Single Element Feedthrough with Threaded Extension Cap

1. Feedthrough Body Size

2. Thread Size

3. Element Diameter

3. Element Diameter

3. Element Diameter

3. Element Diameter

3. Element Diameter

3. Element Diameter

3. Element Diameter

4. Sealant Material

5. Cap Style

5a. B Cap Thread Size (other)

6. Optional Flange

7. Quantity Required

Additional Information

If you are unsure about the specification of the fitting you require, please use the box below to tell us about your application and one of our experienced engineers will call you back to help guide you through the selection process.

Otherwise, please use the drop down boxes provided and we will arrange for a quotation to be sent to you.



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