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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		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			150			150	150	500
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									450			80							550	500		400
0.312	8.0																150	150	450	350	400		250
0.375	9.5																150	150	450					200
0.393	10.0																80	100	350
0.472	12.0																			300		75	200			45	40
0.500	12.7																			300			200				40
0.625	15.88																			200	300		150	100			20
0.750	19.05																			200	300		150			30
0.839	21.3
1.00	25.4

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.
Other types of process connection are available, see Feedthrough Sizes.
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

Qty Required

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Additional Information

If your enquiry is for more than one style of sensor, please email us with your requirements or use the box below

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

Series PF - Feedthroughs

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

Enquiry Form

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