Looking for thermocouples by type? See our Thermocouple Types.
MgO (Magnesium Oxide) Thermocouples
A Pyromation MgO thermocouple assembly consists of a thermocouple element swaged in hard-packed, standard-purity (96%) magnesium oxide mineral insulation and encased in a metal sheath. Thermocouple sheaths have been fully annealed – they can be formed into many configurations, and they can be bent into a radius of twice the size of their outer sheaths.
Available in many standard types, sheath diameters, mounting fittings and terminations. Custom-built products are available upon request.
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General Purpose Tube and Wire Thermocouples
These thermocouples are commonly used in the plastic process industry. The assemblies can be used in many general applications where a ⅛” NPT fitting is preferred, by utilizing either a compression fitting or a bayonet adapter. These sensors are constructed using a 316 stainless steel sheath and insulated thermocouple wire.
Available in many standard types, sheath diameters, mounting fittings and terminations. Custom-built products are available upon request.
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Spring- or Armor-Adjustable Immersion Thermocouples
The JB series spring-adjustable immersion thermocouple has a bayonet cap on an 8″ spring (standard) to allow for
immersion depths of ½” to 7″. This assembly is used in a variety of applications (with a bayonet adapter) where
ease of installation and quick disconnect is preferred. Standard and metric size bayonet caps and adapters are
available.
The JA series armor-adjustable immersion thermocouple has a bayonet cap on the flexible armor and allows for
immersion for the entire specified ‘B’ dimension. This assembly is used in a variety of applications (with a bayonet
adapter) where ease of installation and quick disconnect is preferred. Standard and metric size bayonet caps and
adapters are available.
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Fiberglass or MgO Melt Bolt Thermocouples
The melt bolt thermocouple illustrated above is made of 300 series stainless steel and is constructed using a fiberglass insulated element. This style of thermocouple is used on extruders and injection molding machines to directly measure the melt temperature of plastic as it moves down the extruder barrel.
The melt bolt thermocouple illustrated above is used on extruders and injection molding machines to directly measure the melt temperature of plastic as it moves down the extruder barrel. These melt bolts are made with 300 series stainless steel and are constructed using a metal-sheathed MgO element. The fixed tip style consists of an MgO element brazed to the bolt at a specified tip length and is supplied with a grounded junction as standard. A fast response exposed junction is also standard. The precision tip is manufactured from hardened stainless steel and creates a positive shut off to prevent the back flow of plastic into the bolt. The 5/32″ O.D. tip has an adjustment range of 0″-1″.
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Nozzle Melt Thermocouples
Nozzle-melt temperature sensors are typically placed into the nozzle of a plastic injection molding machine and sense the temperature of the molten plastic prior to being injected into the mold. They are offered in a variety of thermocouple types. The RTDs are constructed using a 100 Ω platinum element with a temperature coefficient of 0.00385ºC-1 (IEC Class B). Elements of other materials, values, and tolerances are available upon request.
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Base Metal Thermocouple Elements
These are replacement elements for complete industrial thermocouple assemblies. Manufactured by Pyromation, these replacement elements are also compatible with other manufacturers’ thermocouple assemblies. Several options are available, and special construction designs can be accommodated upon request.
Straight elements are available as bare wire or ceramic insulated elements.
Angle elements are shipped in a straight configuration and are to be bent at the time of installation.
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Noble Metal Thermocouple Elements
These are replacement elements for use in complete high temperature industrial thermocouple assemblies. Manufactured by Pyromation, these replacement elements are also compatible with other manufacturers’ high temperature thermocouple assemblies.
All insulated elements are supplied with high-temperature alumina insulators and are available with several options.
Element types R, S and B are supplied with a fusion weld. Custom-designed constructions are available.
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Thermocouple Assemblies with Protection Tubes
Metal Alloy
These straight base metal thermocouple assemblies are most commonly used in industrial process heating applications. Schedule 40 protection tubes are standard, and several options are available. Heavier pipe schedule protection tubes and special construction designs are also available.
Special-Service Composite
These straight base-metal thermocouple assemblies are typically used in high temperature and highly corrosive applications commonly found in waste incinerators, cement and lime kilns, utility and waste recovery boilers, and other severe process environments. Special construction designs are also available.
Ceramic
These straight noble- and base-metal thermocouple assemblies, with Series 16 mullite and Series 17 alumina protection tubes, are used in high temperature process heating applications. These assemblies are available with a variety of process mounting fittings and assembly options. Special construction designs are also available.
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High Temperature Thermocouple Assemblies
Pyromation’s high-temperature thermocouples are designed to operate in a temperature range of 1800ºF to 3400ºF. They are designed for use in vacuum furnaces and other applications requiring high-temperature measurement in controlled atmospheric conditions.
Metal sheaths of Alloy 600 and molybdenum are available, as well as alumina ceramic sheaths. All assemblies are supplied with ungrounded, isolated hot junctions. The construction style consists of an alumina-insulated element inside the tube of choice. Special construction designs are also available.
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Explosion-Proof Thermocouple Assemblies for Hazardous Locations
Fixed Element
Explosion-proof, fixed-element thermocouples are made for use in U.S. and Canadian hazardous areas. They are designed to extinguish flames inside the device, eliminating the potential for ignition of flammable mixtures in the surrounding atmosphere.
FM and CSA certified assemblies, dependent on connection head type, meet XP Class I Division I & II; Groups A, B, C, D; DIP Class II Division I; Groups E, F, G; Class III; Type 4/4X.
They may be installed directly in the process without being inserted into a thermowell. The assemblies feature 316 stainless steel sheaths in various diameter sizes and ungrounded isolated junctions. They are available with or without process mountings and with aluminum or stainless steel explosion-proof connection heads.
With Thermowells
Explosion-proof thermocouple assemblies with thermowells are made for use in U.S. and Canadian hazardous areas. They are designed to extinguish flames inside the device, eliminating the potential for ignition of flammable mixtures in the surrounding atmosphere.
FM and CSA certified assemblies, dependent on connection head type, meet XP Class I Division I & II; Groups A, B, C, D; DIP Class II Division I; Groups E, F, G; Class III; Type 4/4X.
The required thermowell is available in standard, heavy-duty, and flanged constructions. The assemblies feature 316 stainless steel sheaths and ungrounded isolated junctions. They are available with aluminum or stainless steel explosion-proof connection heads.
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