Type K Thermocouple
Chromel Alumel thermocouple material for broad industrial temperature measurement
Type K is the most commonly specified base-metal thermocouple type. It uses Chromel as the positive leg and Alumel as the negative leg, giving a broad useful range and strong fit for general industrial, heat-treat, turbine support, validation, and OEM temperature measurement.
Thermometrics manufactures Type K thermocouple assemblies as MI cable probes, wire sensors, plug-and-lead sensors, head-style assemblies, surface sensors, tube-skin thermocouples, rake assemblies, and custom replacement parts built to drawing.
Common Type K RFQ details
Type K temperature range
Type K is commonly referenced for approximately -328°F to 2282°F (-200°C to 1250°C), but the practical assembly rating depends on sheath material, wire insulation, environment, probe diameter, junction style, and service life expectations.
Grounded vs ungrounded Type K
Grounded junctions respond quickly because the measuring junction is connected to the sheath. Ungrounded junctions are insulated from the sheath and are often selected for electrical isolation, noisy environments, or multi-channel systems.
Type K chart PDFs
When Type K is a strong fit
When to review alternatives
Type N may be reviewed where oxidation stability at elevated temperature is important. Noble-metal Type R, S, or B may be reviewed for very high-temperature furnace service. Type T or E may be reviewed for lower-temperature or cryogenic work.
Need a Type K thermocouple built to fit?
Send the drawing, temperature range, sheath, junction, lead, connector, and documentation requirements.