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Home » Products » Mineral Insulated Thermocouple » Ungrounded Junction

Ungrounded Junction

Ungrounded Junction
Ungrounded Junction
Product Code : 06
Product Description

With extensive research and development to cater ever changing requirements of clients, we are engrossed in offering the comprehensive range of Ungrounded Junction. At our sophisticated production setup, our technical team of experts manufactures this junction by make utilization of standard quality materials. This is used primarily for isolating the control system from the sensor and to prevent ground loop. Can be availed from us in diverse specifications, this Ungrounded Junction is rigorously tested on different parameters prior final dispatching.

Features:

  • Easy operation
  • User-friendly design
  • Hassle-free working

 

 Further Details:

In this type the thermocouple wires are insulated from the sheath with magnesium oxide powder (soft). This junction should be used where the thermocouple may come in contact with electrical lines or where the control system requires an ungrounded input. Applications are the same as for the grounded type, but response time is slower.

Thermocouple Types:

Iron-Constantan (ANSI Symbol J) The Iron-Constantan 'J' curve thermocouple with a positive iron wire and a negative Constantan wire is recommended for reducing atmospheres. The operating range for this alloy combination is 870oC for the largest wire sizes. Smaller size wires should operate in correspondingly lower temperatures.

Copper-Constantan (ANSI Symbol T) The copper-Constantan 'T' curve thermocouple, with a positive copper wire and a negative constantan wire is recommended for use in mildly oxidizing and reducing atmosphere up to 400oC. They are suitable for applications where moisture is present. This alloy is recommended for low temperature work since the homogeneity of the component wires can be maintained better than other base metal wires. Therefore, errors due to inhomogeneity of wires in zones of temperature gradients is greatly reduced.

Chromel-Alumel (ANSI Symbol K) The Chromel-Alumel 'K' Curve thermocouple with a positive Chromel wire and a negative Alumel wire is recommended for use in clean oxidizing atmospheres. The operating range for this alloy is 1260oC for the largest wire sizes. Smaller wires should operate in correspondingly lower temperatures.

Chromel-Constantan (ANSI Symbol E) The chromel-Constantan thermocouple may be used for temperatures up to 870oC in a vacuum or inert, mildly oxidizing or reducing atmosphere. At sub-zero temperatures, the thermocouple is not subject to corrosion. This thermocouple has the highest emf output of any standard metallic thermocouple.

Platinum-Rhodium Alloys (ANSI Symbol S,Rand B) Three types of 'noble-metal' thermocouples are in common use, they are:

  • A positive wire of 90% platinum and 10% rhodium used with a negative wire of pure platinum
  • A positive wire of 87% platinum and 13% rhodium used with a negative wire of pure platinum, and

A Positive wire of 70% platinum and 30% rhodium used with a negative wire of 94% platinum and 6% rhodium. They have a high resistance to oxidation and corrosion. However, hydrogen, carbon and many metal vapors can contaminate a platinum-rhodium thermocouple. The recommended operating range for the platinum-rhodium alloys is 1530oC although temperatures as high as 1800oC can be measures with the PT-30% Rh vs PT-6% Rh alloy combination.

Sheath Material Temperature Characteristics:

Metal

Recommended Maximum operating temperature

Melting temperature

Copper

149oC

1082oC

Aluminium

371oC

660oC

Monel

538oC

1343oC

Low Carbon Steel

649oC

1525oC

316 Stainless Steel

899oC

1371oC

304 Stainless steel

899oC

1427oC

310 Stainless steel

1093oC

1399oC

Inconel

1149oC

1427oC

Nickel

1260oC

1454oC


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