Chromel


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chromel

[′krō‚mel]
(meteorology)
An alloy containing 90% nickel and 10% chromium, used to form the chromel-alumel thermocouple.

Chromel

 

an alloy of nickel and chromium characterized by a favorable combination of thermoelectric properties and heat resistance. Chromel contains about 10 percent Cr, about 1 percent Co, and several impurities, specifically, up to 0.2 percent C and up to 0.3 percent Fe. It has a rather high and almost linear variation of thermoelectromotive force over a wide temperature range. The thermoelectromotive force of a chromel-platinum thermocouple at temperatures of 1000° and 0°C is about 33 millivolts. Chromel maintains a constant thermoelectromotive force during prolonged operation in air at temperatures ranging between 20° and 1000°C; at higher temperatures, its service reliability is reduced.

Chromel is manufactured in the form of wires and is paired with alumel as a positive thermoelectrode in a chromel-alumel thermocouple, which is used for measuring temperatures. Chromel is also used as compensating wires. In the USSR, types NKh9.5 and NKh9 chromels are manufactured.

References in periodicals archive ?
Twenty-five 30 gauge Chromel Alumel thermocouples (Omega Engineering, Stamford, Connecticut, USA) connected to two underground Campbell CR10 data loggers (Campbell Scientific, North Logan, Utah, USA) were placed horizontally under the litter layer at the mineral soil surface in the first 13 transect plots extending in each direction from the base of the L.
A line of hermetic headers, connectors, and feedthroughs uses pins made of Alumel, Chromel or Copper.
Conventional iron-constantan or chromel alumel thermocouples, for example, begin to lose accuracy and reliability.
Type K thermocouples are formed by welding together a Chromel (nickel with 10% chromium) wire and an Alumel (nickel with 5% aluminum silicon) wire and are suitable for measuring temperature differences from -200[degrees]C to +1,350[degrees]C.
Limited Tenders are invited for Procurement of water soluble purging paper and thermocouple wire chromel alumel k type for stress relieving temperature measurement 2 items
When the furnace had reached the predefined temperature, the sample (base and insert) was lowered into the hottest place (1320[degrees]C) of the furnace by using chromel wire and held there for 30 min after which it was subjected to air cooling to room temperature.
Limited Tenders are invited for Hermetically Sealed Unit Connectors Mating Connectors Chromel Contacts Alumel Contacts Accessories
Tenders are invited for Digital Thermometer With K Chromel Almel Type Adapter Range Minus -50 C To 1300 C , L .C 1 C /1 F Type 3.1/2 Digit , Battery - 9 Volt App Wt - 210 Gm Make : Ce Or Cie 305 , 306 Or Toshinwal Or Meco Kusam Only.
Tenders are invited for Supply Of K-Type (Chromel Alumel ) Thermocouple Extention Cable.
Tenders are invited for Digital Thermometer With K Chromel Almel Type Adapter Range -50 C To 1300 C , L .C 1 C /1 F Type 3 1/2 Digit , Battery - 9 Volt App Wt - 210 Gm Make : Ce Or Cie 305 , 306 Or Toshinwal Or Meco Kusam Only.
Sheathed Thermocouple with following Technical Specifications 1) Element : Chromel - Alumel K-Type 2) Type : Duplex, Ungrounded 3) Sheath material : SS .