Series ASF Pressure and Vacuum Sealed Feedthroughs for Autoclave Sensors
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These feedthroughs are designed for use within sterilising and composite autoclave applications, sealing multiple sensor or instrumentation wires exiting an enclosure.
Series ASF feedthroughs seal thermocouple pairs insulated in a single shot PTFE cable which is gas, steam and water tight. Available in thermocouple types K, J, T and N.
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.
The thermocouple pairs are available with or without junctions. Please contact us for further details.
- Seal on PTFE single shot thermocouple wires
- Immersion length of the element can be easily adjusted
- Three sizes of feedthrough assembly
- 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: 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 |
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 2 (1/4") | No. of Elements |
Size 3 (1/2") | No. of Elements |
Size 4 (3/4") | |
---|---|---|---|---|---|---|---|
Sealant | V | V | 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. |
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Conductor | Overall | ||||||
0.376mm | 2.3mm | 1 to 4 | 3 bar | 1 to 8 | 3 bar | 1 to 24 | 3 bar |
- 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.
- Each pre-installed element is a single PTFE standard autoclave thermocouple cable - see Cable Details.
Blank (undrilled) sealants are also available for series ASF feedthroughs. When a blank sealant is required, the word 'Blank' should be inserted in the order code instead of an element diameter.
Feedthroughs with blank sealants are not pressure rated.
Size 2 (1/4" Thread or equivalent) | Size 3 (1/2" Thread or equivalent) | Size 4 (3/4" Thread or equivalent) |
---|---|---|
Illustration | Description | Colour Codes available |
---|---|---|
Available in thermocouples types K, J, T and N, this cable comprises a pair of solid thermocouple conductors 1/0.376mm diameter (27AWG) encased in a 'single shot' PTFE insulation (round construction, 2.3mm overall diameter). PTFE 'single shot' cables are gas, steam and water tight making them ideal for autoclave applications. Supplied according to IEC colour codes as standard, although ANSI colours are available on request. |
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