You are here → Home > Fittings and Feedthroughs > Pressure and Vacuum Feedthroughs > Series MF

Multi Thermocouple Feedthroughs

Series MF - Pressure and Vacuum Feedthroughs for Multiple Elements

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.

Series MF feedthroughs can seal multiple elements within a single assembly including typically up to 40 x 0.040” dia., up to 12 x 0.125” or up to 4 x 0.250”. Please refer to the table for further details of feedthrough capacity and sizes of elements.

There are four body sizes having 1/8”, 1/4”, 1/2” and 3/4” process connections with NPT threads. Contact us for other thread type availability.

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
Four sizes of sealed feedthrough for probes, sensors, etc.
Designed for carrying multiple elements 0.020” to 0.250” diameter
Suitable for a mixture of sizes and types of elements
Pressure range: Vacuum to 10,000 psi *
Temperature range: -328°F to +1,600°F *
316L Body (and seat where applicable). Follower and cap in 303 or 304
Choice of five sealant materials
Reusable fitting – sealant and internal components replaceable
A large range of feedthroughs is available to buy online

* Dependent on sealant and fitting selected

Body Size, Pressure Guide and available Bore Sizes for 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 psi) at 68°F (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	5800	5800	3600	3600	3600	4 to 8	4300	5800	3600	3600	3600
0.032	0.8								4300	5800			3600
0.040	1.0								7200	10000			7200	4 to 16	10000	10000	5800	3600	6500	8 to 40	7900	7900	4300	6500
0.059	1.5							2 to 6			2900	2900		4 to 12						8 to 28			3600
0.062	1.59
0.080	2.0
0.118	3.0							2				2100		2 to 4			5000	2900	5000	4 to 12				5000	8 to 24	2900	2100	1400	2100
0.125	3.2							2				2100		2 to 4			5000	2900	5000	4 to 12				5000	8 to 24	2900	2100	1400	2100
0.177	4.5													2			4300	2100	3600	2 to 4	5000		2100	4300	4 to 8	2100	1000	1000	580
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				290
0.375	9.5																								2 to 4				290

The guide pressures shown for each type of sealant are at 68°F (20°C). Spectite^® feedthroughs from TC Inc. 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 68°F (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.

Multi Thermocouple Feedthroughs

Series MF - Pressure and Vacuum Feedthroughs for Multiple Elements

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

Pressure and Vacuum Feedthrough Enquiry Form

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