Series BSF Pressure and Vacuum Sealed Feedthroughs for Bearing Sensors

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These feedthroughs are designed for use with bearing sensors, sealing individual sensor or instrumentation wires exiting an oil filled bearing enclosure to prevent oil migrating along the sensor leads.

Common low pressure applications include sealing sensor wires in motors, pumps, generators etc and other types of sensor where they exit a process enclosure.

Series BSF feedthroughs seal insulated wires from 32 AWG (0.2mm) to 20 AWG (0.8mm). There are three body sizes (2 to 4) 1/4", 1/2" and 3/4" 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 Thread 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 insulated wires
Immersion length of the element can be easily adjusted
Three sizes of feedthrough assembly
Designed for easy installation of wires from 0.7mm to 3.5mm overall diameter
Guide pressure range: Vacuum up to 3 bar
Temperature range: -40°C to +225°C
316L Stainless steel wetted parts (see Cutaway View)
Reusable and replaceable internal components

Standard Body Style ('A' Cap)	Threaded Extension ('B' Cap)	Weld Neck	Flanges

Standard body style suitable for most applications.	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. Specify as 'WELD' for the thread size in the order code.	For termination to a mating flange within the process, see Optional Flanges for details of the flanges available as standard.

Size 2 (1/4" Thread or equivalent)	Size 3 (1/2" Thread or equivalent)	Size 4 (3/4" Thread or equivalent)
Standard Thread Sizes	Standard Thread Sizes	Standard Thread Sizes
1/4" BSPT, 1/4" BSPP, 1/4" NPT	1/2" BSPT, 1/2" BSPP, 1/2" NPT	3/4" BSPT, 3/4" BSPP, 3/4" NPT
Alternative Thread Sizes	Alternative Thread Sizes	Alternative Thread Sizes
M10x1.0, 7/16" UNF-20	3/8" BSPT, 3/8" BSPP, 3/8" NPT	M22x1.5, 3/4" SAE-16, 7/8" UNF-14
M12x1.5, 1/2" UNF-20	M14x1.5, 7/16" SAE-20, 9/16" UNF-18	M24x2.0, 7/8" SAE-14, 1" UNF-14
	M16x1.5, 1/2" SAE-20, 5/8" UNF-18
	M20x1.5, 9/16" SAE-24, 3/4" UNF-16

Sealant Material	Code	Colour	Example	Operating Temperature Range	Re-usable	Material definition and properties
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.

Style 'A' (Supplied as standard)	Description	Style 'B' (Alternative cap)	Description
STANDARD	Standard Fitting with single thread for direct mounting into process.		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: BSF2 - 1/4" BSPT - 0.5 - 2 - V - B NPT If a B cap is used with a weld neck fitting, then the thread form must be specified.

Style 'A' (Supplied as standard)

Description

Style 'B' (Alternative cap)

Description

STANDARD

Standard Fitting with single thread for direct mounting into process.

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:
BSF2 - 1/4" BSPT - 0.5 - 2 - V - 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 for details.

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")
Sealant		No. of Elements	V	No. of Elements	V	No. of Elements	V
Wire Size (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.
Minimum	Maximum
0.5mm	1.5mm	2 to 4	3 bar	2 to 8	3 bar	2 to 14	3 bar
1.8mm	2.8mm			2 to 4	3 bar	2 to 8
2.9mm	3.5mm					2 to 6

The guide pressures shown for each type of sealant are at 20°C. Spectite^® feedthroughs from TC 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 2 (1/4" Thread or equivalent)	Size 3 (1/2" Thread or equivalent)	Size 4 (3/4" Thread or equivalent)

Please note: the overall length will vary slightly depending on the sealant used and the tube size.

Enquiry Form - Bearing Sensor Feedthrough

1. Feedthrough Body Size

2. Thread Size

3. Wire Diameter (over insulation)

4. Number of Elements

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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Series BSF Pressure and Vacuum Sealed Feedthroughs for Bearing Sensors

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

Enquiry Form - Bearing Sensor Feedthrough

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