Vaishnav Instruments

ceramic 710 & 610  thermocouple case & skin thermocouple

A thermocouple is a sensor for measuring temperature. It consists of two dissimilar metals, joined together at one end, which produce a small unique voltage at a given temperature. This voltage is measured and interpreted by a thermocouple thermometer.

Thermocouples are available indifferent combinations of metals or calibrations. The four most common calibrations are  J, K, T, E, R, S, B. Each calibration has a different temperature range and environment, although the maximum temperature varies with the diameter of the wire used in the thermocouple. Because thermocouples measure in wide temperature ranges and can be relatively rugged, they are very often used in industry. The following criteria are used in selecting a thermocouple :

Temperature range

Chemical resistance of the thermocouple or sheath material

Abrasion and vibration resistance

Installation requirements (may need to be compatible with existing equipment; existing holes may determine probe diameter.)

Closely resembling to metal, permamelt is a new unique engineering ceramic. It is good choice as thermocouple protection tubes and immersed heater protection tubes for use in molten aluminum baths, even where there are rapid temperature fluctuations.

Due to impermeable and non-wetting surface of permamelt the thermocouples assemblies need no daily washing or coating thereby proving use maintenance free use in molten aluminum baths, much longer than any other protection tube material. Permamelt thermocouple protection tubes require no preheating due to their low thermal expansion coefficient and thermal shock resistance.

Their low heat conductivity helps to prevent temperature drop in the molten aluminum bath and contributes to energy conservation. Since the tubes are of ceramic material, there is no iron pick-up to create inclusion in the aluminum.

S.S. Thermocouple Assembly

Our thermowell bodies are machine and drilled from solid bar stock. This results in a non-welded water tight unit. High accuracy machines are used to ensure concentricity of the bore with respect to the outside diameter and a consistant wall thickness over the full length of the thermowell.

1. Varis On Strands & Swg Of Wire [Ex : 3/22-7/36- 14/36 – 40 /36-24/36-1/22-1/24-1/36-19/34-19/36-7/40 Etc] In This Case First Digit Stands For No. Of Strands & The Second Digit Stands For Strands.
2. Types Of Cable K,j,r,s,t,e,b,n,rtd Etc.
3. “original” & Compensating Grade Cables
4. Available In Simplex / duplex/triplex & Multi Cores
5. Braidings Available Like : Pvc / Fg/ Asb / Teflon/ Capton / Silk / Silicone Rubber / Neoprene Rubber/ Ceramic Braiding / S.s./ Tin Copper Etc.
6. Armoured Cables Also Available.
7. Colour Codes As Per Standards.

Mineral Insulated Flexible Thermocouple Cables & Assemblies

M.I. Cables are used as extension of thermocouples or itself used as thermocouples. Makes of ,.i. Cables are of “isomil” or “tyco”. The benefits of using m.i. Thermocouple cables, that is available in single length assemblyfrom minimum 1 feet to maximum length 50 mtrs length & is easy to transport. Thermocouple can be made in coil form. The accuracy of m.i. Assembly is available in 2 classes 1] +/- 2.2c 2 ] +/- 1c. Its so flexible that it can measure temperatures where base metal thermocouple can not sense job temperature. It measure temperatures in curve areas / deep vessel tanks / drum industries/boilers/bell furnaces/vaccum furnaces/rotary furnaces mm-0.75mm-1mm-1.5mm-3mm-4.5mm-6mm-8mm-9.6mm-15mm. Sheathings available : s.s.316-s.s. 310 & inconal 600. Available in simplex & duplex types. Types available : k,j,r,s,b,t,e, rtd. Cold end junctions : ceramic block with spring loaded screws, head type, transmitter type, flying lid type, post seal type male-femal connector type etc.. Temp. Range from - 200c to + 2300c.

Available in types : K, J, R, S, T, B, N, RTD, W, C, D.

Connector size : miniature sub miniature & heavy duty

3 types of connector

Glass filed nylon connectors

Ceramic connectors

Pannel mounting connectors

These sheaths mainly used in glass-flask-billiards-foundries-forging-petrochemical industries, where temperatures are above 1150^oc & 1600^oc, or used in critical applications where noble metals are of no use. In some applications where there is vibration 610 sheaths gets break & in case of 710 type sheaths gives good life. Dias available from 6 mm od to 32 mm od. & lengths available from 350 mm to 3000 mm long.