Series MF Multiple Sensor Pressure and Vacuum Feedthrough with Threaded Extension

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a Feedthrough?

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A single access port into an enclosure or process vessel is all that is needed to allow multiple probes, sensors, etc., to pass through an environmental or pressure boundary using a single feedthrough assembly.

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

Series MF feedthroughs can seal multiple elements within a single assembly including typically up to 40 x 1.0mm dia., up to 12 x 3.0mm dia. or up to 4 x 6.0mm dia. elements. Please refer to the table for further details of feedthrough capacity and sizes of elements.

There are five body sizes having 1/8", 1/4", 1/2", 3/4" and 1" 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.

Saves time and costs by allowing multiple sensors to pass through one feedthrough fitting
Immersion length of each element can be easily adjusted as required
Five sizes of feedthrough assembly
Designed for carrying multiple elements 0.5mm to 9.53mm diameter
Suitable for a mixture of sizes and types of elements
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 1 (1/8" Thread or equivalent)	Size 2 (1/4" Thread or equivalent)	Size 3 (1/2" Thread or equivalent)
Standard Thread Sizes	Standard Thread Sizes	Standard Thread Sizes
1/8" BSPT, 1/8" BSPP, 1/8" NPT	1/4" BSPT, 1/4" BSPP, 1/4" NPT	1/2" BSPT, 1/2" BSPP, 1/2" NPT
Alternative Thread Sizes	Alternative Thread Sizes	Alternative Thread Sizes
M8x1.0, 3/8" UNF-24	M12x1.5, 1/2" UNF-20	3/8" BSPT, 3/8" BSPP, 3/8" NPT
M10x1.0, 7/16" UNF-24	M14x1.5, 7/16", UNF-18	M16x1.5, 1/2" SAE-20, 5/8" UNF-18
		M20x1.5, 9/16" SAE-24, 3/4" UNF-16

Size 4 (3/4" Thread or equivalent)	Size 5 (1" Thread or equivalent)
Standard Thread Sizes	Standard Thread Sizes
3/4" BSPT, 3/4" BSPP, 3/4" NPT
Alternative Thread Sizes	Alternative Thread Sizes
M24x2.0, 7/8" SAE-14, 1" UNF-14	1" BSPT, 1" BSPP, 1" NPT
	M33x2.0, 1+5/8" SAE-12, 1+1/8" UNF-14

Sealant Material	Code	Colour	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: MF3 - 1/2" BSPT - 1.5 - 8 - G - B NPT If a B cap is used with a weld neck fitting, then the thread form must be specified.

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:
MF3 - 1/2" BSPT - 1.5 - 8 - G - B NPT

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

Style	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		No. of Elements	Size 1 (1/8")³					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			Size 1 (1/8")³						Size 2 (1/4")						Size 3 (1/2")						Size 4 (3/4")¹					Size 5 (1")
Sealant			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)		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	2 to 4	400	400	250	250	250	4 to 8	300	400	250	250	250
0.032	0.8								300	400			250
0.040	1.0								500	700			500	4 to 16	700	700	400	250	450	8 to 40	550	550	300	400
0.059	1.5							2 to 6			200	200		4 to 12						8 to 28			250
0.062	1.59
0.080	2.0
0.118	3.0							2				150		2 to 4			350	200	350	4 to 12				350	8 to 24	200	150	100	150
0.125	3.2							2				150		2 to 4			350	200	350	4 to 12				350	8 to 24	200	150	100	150
0.177	4.5													2			300	150	250	2 to 4	350		150	300	4 to 8	150	70	70	40
0.187	4.76																			2 to 4					4 to 8
0.236	6.0																								2 to 6
0.250	6.35																								2 to 6
0.315	8.0																								2 to 4				20
0.375	9.5																								2 to 4				20

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.

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 - Multiple Element Feedthrough with Threaded Extension

1. Feedthrough Body Size

2. Thread Size

3. Element Diameter

4. Number of Elements

5. Sealant Material

6. Cap Style

5a. B Cap Thread Size (other)

7. Optional Flange

8. 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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Series MF Multiple Sensor Pressure and Vacuum Feedthrough with Threaded Extension

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

Enquiry Form - Multiple Element Feedthrough with Threaded Extension

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