Noun
Chromel (uncountable)
An alloy of approximately 90% nickel and 10% chromium by weight, used to make the positive conductors of certain thermocouples.
Coordinate term: Alumel
Although not always distinctively green, the chromel wire will develop a mottled silvery skin and become magnetic. Source: Internet
In these thermocouples ( chromel – gold iron alloy), the negative wire is gold with a small fraction (0.03–0.15 atom percent) of iron. Source: Internet
An easy way to check for this problem is to see whether the two wires are magnetic (normally, chromel is non-magnetic). Source: Internet
If, however, a mostly reducing atmosphere (such as hydrogen with a small amount of oxygen) comes into contact with the wires, the chromium in the chromel alloy oxidizes. Source: Internet
K-type thermocouple ( chromel – alumel ) in the standard thermocouple measurement configuration. Source: Internet
The measured voltage turns out to be : where and are the Seebeck coefficients of the conductors attached to the positive and negative terminals of the voltmeter, respectively (chromel and alumel in the figure). Source: Internet