SPIR

Supported Applications

The Omega SPIR series consists of fine diameter, uninsulated thermocouple wires designed for temperature measurement applications requiring base metal types J, K, T, N, and E. These bare wire elements are supplied as single legs or matched pairs to facilitate the construction of custom sensors or extension wiring in configurations where insulation is not required.

Operating Conditions & Performance

The series covers a diameter range from 0.013 mm (0.0005") to 3.25 mm (0.128"). Standard stock lengths are provided on 76 mm (3") plastic spools with an overall length of 15 m (50'). The product overview notes that additional sizes and quantities are available upon special request.

Configuration Options

The SPIR series is configurable across multiple thermocouple types, wire diameters, and leg configurations. Selection involves specifying the material type, diameter code, and length suffix where applicable.

• Thermocouple Types: Type J (Iron/Constantan), Type K (CHROMEGA®/ALOMEGA®), Type T (Copper/Constantan), Type N (OMEGA-P Nicorosil/OMEGA-N Nisil), and Type E (CHROMEGA®/Constantan).
• Wire Diameters: Available from 0.013 mm to 3.25 mm.
• Packaging: Supplied on 76 mm (3") plastic spools in standard lengths of 15 m (50').
• Configuration Options: Wires are offered as single legs or matched pairs. When ordering matched pairs, specific part number combinations must be used to ensure correct material pairing.

Key Product Differences

The series utilizes distinct model prefixes and suffixes to identify the thermocouple type and wire diameter.

• Type J: SPIR for Iron; SPCI for Constantan.
• Type K: SPCH for CHROMEGA®; SPAL for ALOMEGA®.
• Type T: SPCP for Copper.
• Type N: SPOP for OMEGA-P (Nicorosil); SPON for OMEGA-N (Nisil).
• Type E: SPCH for CHROMEGA®; SPCC for Constantan.

The model number format follows the pattern SPIR-, with specific examples such as SPIR-010 representing Type J iron wire at 0.25 mm (0.010") diameter, and SPCH-020 representing Type K CHROMEGA® wire at 0.5 mm (0.020") diameter.

Material Pairing Note: There are two forms of Constantan with differing constituent element percentages. One form is matched to Iron (SPCI), while the other matches Copper or CHROMEGA® (SPCC). Correct pairing requires specifying SPCI with SPIR, and SPCC with either SPCP or SPCH.