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  • Mineral Insulated Thermocouple

  • Fabricated Thermocouple

  • Mineral Insulated PT100 (RTD)

  • Fabricated PT100 (RTD)

  • Trace Heating Elements

  • Accessories

  • Bespoke Temperature Sensors

  • On Site Survey

  • Diameters Ranging From 0.5mm up to 10.8mm

Thermocouple Sensors

What Is A Thermocouple?

A Thermocouple is a sensor used to measure temperature. They are 3 options for how many junctions can be found in a Thermocouple, a simplex Thermocouple (two wire) a duplex Thermocouple (4 wire) & a triplex Thermocouple (6 wire). To create a junction the wires need paired, each pair consists of two dissimilar metals, when welded together this is known as a hot junction. Once the junction of the Thermocouple has been welded and has contact with a heat source, this creates a milivoltage. The milivoltage travels along the Thermocouple wire, which can then be converted in to temperature using Thermocouple reference tables to calculate the temperature.

Northeast Thermocouple Sensors Ltd can manufacture the following:

                                                                           nts-centre-logo   Type K Thermocouple                + Chromel / – Alumel

                                                                           nts-centre-logo   Type J Thermocouple                 + Iron / – Constantan

                                                                           nts-centre-logo   Type N Thermocouple               + Nicorsil / – Nisil

                                                                           nts-centre-logo   Type T Thermocouple                + Copper / – Constantan

                                                                           nts-centre-logo   Type E Thermocouple                + Chromel / – Constantan

                                                                           nts-centre-logo   Type R Thermocouple                + Copper / – Alloy 11

                                                                           nts-centre-logo   Type S Thermocouple                + Copper / – Alloy 11

RTD (PT100)

What Is An RTD?

Utilising a high precision sensing resistor, usually of platinum, the resistance value of which increases with temperature. The platinum sensing resistor is highly stable and allows high accuracy temperature sensing. RTD’s offer excellent accuracy over a wide temperature range (from –200 to +850 °C) with various accuracy specifications and numerous packaging options to suit most applications. Unlike Thermocouples, it is not necessary to use special cables to connect to the sensor. The principle of operation is to measure the resistance of a platinum element. The most common type (PT100) has a resistance of 100 ohms at 0 °C and 138.4 ohms at 100 °C.

Northeast Thermocouple Sensors can manufacture your RTD in the following configurations:

Simplex RTD – 2 wire, 3 wire, 4 wire

Duplex RTD – 2 wire, 3 wire, 4 wire

               Thermocouple’s are generally:                                        RTD’s are generally:

                 nts-centre-logo   Relatively inexpensive                                           nts-centre-logo   More expensive

                 nts-centre-logo   More rugged                                                           nts-centre-logo   More accurate

                 nts-centre-logo   Less accurate                                                          nts-centre-logo   Highly stable

                 nts-centre-logo   More prone to long-term drift                             nts-centre-logo   Capable of better resolution

                 nts-centre-logo   More sensitive                                                        nts-centre-logo   Restricted in their range of temperature

                 nts-centre-logo   Tip sensing                                                              nts-centre-logo   Stem, not tip sensitive

                 nts-centre-logo   Available in smaller diameters                            nts-centre-logo   Rarely available in small diameters

                 nts-centre-logo   They do need special cabling                              nts-centre-logo   They do not need special cabling

In both cases the choice of Thermocouple (and type of Thermocouple) or RTD must be made to match the instrumentation and suit the application in question.