Our thermocouple product line meets ASTM:E230 and ANSI MC96.1 specifications. They are manufactured in accordance with the ISO-9002 Quality Assurance Program. AceTronic carries a large variety of thermocouples with same day shipment. Should you require a custom product, AceTronic will design and supply sensors to meet your application.

Properties of Thermocouples

Thermocouple sensors are used throughout the industry for their robust construction and consistent measurements of temperature. A thermocouple consists of two dissimilar metal wires fused together at the point where the temperature is to be measured. The thermocouple produces a millivolt signal which increases with a temperature rise.


Type J and type K thermocouples are used extensively throughout the plastic industry. Material and colour designations are in accordance with ANSI MC96.1 industry standards. Type J and type K thermocouples have an accuracy of 2.2°C or .75% of actual reading which ever is greater. Special limits of error thermocouples are available for applications where an accuracy of 1.1°C or .4% of reading is required.


Type J thermocouples are made with iron (+) and constantan (-) conductors. The polarity of the leads are colour coded as (+) white and (-) red on the insulation.Type K thermocouples are made with chromel (+) and alumel (-) conductors. The polarity of the leads are colour coded as (+) yellow and (-) red on the insulation.

Measuring Junction

The thermocouple junction can be fabricated as grounded or ungrounded. Thermocouples with grounded junctions have the element wires joined to the sheath during the manufacturing process. This method of manufacturing is the most common. Thermocouples with ungrounded junctions have the element wires electrically isolated from the metal sheath. Ungrounded junctions are specified for special applications where electrical noise or special electrical grounding considerations are required.

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