ANSI Designations
The Alloys That Make Up The Calibrations
| ANSI Letter |
Description | Popular Generic & Trade Names* |
|---|---|---|
| T | TP | Copper |
| TN | Constantan, Cupron, Advance | |
| J | JP | Iron |
| JN | Constantan, Cupron, Advance | |
| E | EP | Chromel, Tophel, T1 |
| EN | Constantan, Cupron, Advance | |
| K | KP | Chromel, Tophel, T2, Thermokanthal KP |
| KN | Alumel, Nial, T2, Thermokanthal KN | |
| R | RP | Platinum 13% Rhodium |
| RN | Pure Platinum | |
| S | SP | Platinum 10% Rhodium |
| SN | Pure Platinum | |
| B | BP | Platinum 30% Rhodium |
| BN | Platinum 6% Rhodium | |
| N | NP | Nicrosil |
| NN | Nisil | |
| *Trade Names: Cupron, Nial and Tophel -- Amax; Advance, T1, and T2 -- Driver-Harris Co; Chromel and Alumel -- Hoskins Mfg, Co.; Thermokanthal KP and Thermokanthal KP - Kanthal Co. |
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The above table show the alloy composition of the Calibrations. A Thermocouple Wire has two wires, a positive leg and a negative leg. In the description column for calibration "T" has TP and TN. TP stands for the positive leg of the wire while TN stands for the negative.
