The Pyromation Industrial High-Temperature Thermocouple Assemblies are designed for vacuum furnaces and controlled-atmosphere applications requiring measurement from 1800 °F to 3400 °F (982 °C to 1871 °C). Featuring alumina-insulated elements with Alloy 600, molybdenum, or alumina ceramic sheaths, this series ensures reliable sensing across oxidizing, inert, and vacuum environments.
Ordering uses a seven-segment code covering element type, sheath size/material, length, mounting fitting, plug/leadwire transition, extension leadwire, and termination. Duplex elements use a doubled prefix letter (e.g., RR24U). Leadwire and termination codes are selected from positions 5–7. Consult the factory for non-standard diameters or insulations.
Example Order Number
R24U – 403 – 24 – 05A – 15 – F1A036 – 4
Type R 24ga • 0.250″ Alloy 600 • 24″ Length • 1/4″ SS Compression • Leadwire Transition • Fiberglass Armored 36″ • Standard Plug
| Code | Description |
|---|---|
| B24U | Type B, 24 gauge, ungrounded |
| C24U | Type C, 24 gauge, ungrounded |
| R24U | Type R, 24 gauge, ungrounded |
| S24U | Type S, 24 gauge, ungrounded |
| R26U | Type R, 26 gauge, ungrounded |
| S26U | Type S, 26 gauge, ungrounded |
For duplex elements, use order code prefix letter twice (e.g., RR24U). CC24 assemblies not available in 0.188″ O.D. sheath diameter.
| Code | Material | Sheath Dia. | Max. Temp. | Atmosphere |
|---|---|---|---|---|
| 303 | Alloy 600 | 0.188″ | 1149°C [2100°F] | Oxidizing, Inert, or Vacuum |
| 403 | Alloy 600 | 0.250″ | 1149°C [2100°F] | |
| 302 | Molybdenum | 0.188″ | 1482–1871°C [2700–3400°F] | Inert or Vacuum |
| 402 | Molybdenum | 0.250″ | 1482–1871°C [2700–3400°F] | |
| 617 | Alumina | 0.275″[1] | 1482–1871°C [2700–3400°F] | Oxidizing, Inert, or Vacuum |
[1] Alumina sheath supplied with 3/8″ O.D. × 4″ long stainless steel sleeve on tube cold end. Only available with size B and C compression fittings. All assemblies are provided with a wire seal fitting, except platinum element assemblies in Alloy protection tubes. All C24 assemblies in alumina protection tubes are intended for use only in inert or vacuum atmospheres.
| Length | Length |
|---|---|
| 12 | 30 |
| 18 | 36 |
| 24 | — |
Specify other lengths in 1″ increments.
| Code | Type | NPT Size | Available Sheath Dia. |
|---|---|---|---|
| 00 | No sheath mounting fitting | ||
| One-Time Adjustable Compression Fittings | |||
| 05A | Stainless steel | 1/8″ | 3/16″, 1/4″ |
| 05B | Stainless steel | 1/4″ | 3/16″, 1/4″, 3/8″ |
| 05C | Stainless steel | 1/2″ | 1/4″, 3/8″ |
| Re-Adjustable Compression Fittings | |||
| 12A | Stainless steel | 1/8″ | 3/16″, 1/4″ |
| 12B | Stainless steel | 1/4″ | 1/4″, 3/8″ |
| 12C | Stainless steel | 1/2″ | 1/4″, 3/8″ |
Teflon® gland standard (400°F max.).
| Code | Description | Sheath O.D. |
|---|---|---|
| 4 | Standard plug | 3/16″ thru 3/8″ |
| 4,HT | Standard hi-temp plug — 385°C [725°F] | 3/16″ thru 3/8″ |
| MC | Mating connector | — |
| Code | Description |
|---|---|
| 9CF31 | Aluminum screw-cover head secured to sheath with SS compression fitting |
| 8HN31[1] | Aluminum screw-cover head with 1/2″ NPT stainless steel hex fitting |
| 9CF25 | Mini nickel-plated steel head |
| Code | Description |
|---|---|
| 15[1] | Extension leadwire transition fitting with relief spring — 204°C [400°F] |
| 15HT[1] | Extension leadwire transition fitting with relief spring and high-temperature potting — 538°C [1000°F] |
| Code | Wire Gauge / Insulation Description | T/C Available |
|---|---|---|
| F1 | Solid; fiberglass insulation | R, S, B |
| F1A | Solid; fiberglass insulation with flexible S.S. armor | R, S, B |
| T1 | Solid; Teflon® insulation | R, S |
| T1A | Solid; Teflon® insulation with flexible S.S. armor | R, S |
To complete order code, insert wire code and 3-digit “B” length code. Example: F1A036 = 36″ “B” length.
| Code | Description |
|---|---|
| 0 | Leads not stripped |
| 2 | 2″ split leads, 1/4″, stripped |
| 3 | 2″ split leads with spade lugs |
| 4[1] | Standard plug |
| 6[1] | Miniature plug |
| Options | |
| MC[1] | Mating connector |
[1] Only with platinum elements in 303–403 sheaths.
Pyromation High-Temperature Thermocouple Assemblies (PDF)
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