Marlin insulated and bare thermocouple wire is matched to meet standard initial calibration tolerances for temperatures above 0°C as given in ANSI/ASTM E230, and shown in the table below without regard for wire size (wire size upper temperature limits).
Wire conforming to special initial calibration tolerances, wire for use at sub-zero temperatures, and wire with certified traceable calibration is available on request. Designate special limit grade wire using a double ANSI/ASTM symbol (e.g., KK, JJ). Sub-zero and calibration requirements should be spelled out on the Purchase Order.
| INITIAL CALIBRATION TOLERANCES FOR THERMOCOUPLE WIRE | |||||||
|---|---|---|---|---|---|---|---|
| THERMOCOUPLE TYPE | °C | °F | |||||
| Wire Alloys | ANSI/ASTM Type Symbol | Temperature Range | Standard Limits | Special Limits | Temperature Range | Standard Limits | Special Limits |
| Copperl (+) vs. Constantan (-) | T | -200 to -65 -65 to +130 +130 to +350 | +/- 1.5% +/- 1 +/- .75% | +/- .8% +/- .5 +/- .4% | -330 to -85 -85 to +270 +270 to +660 | +/- 1.5% +/- 1.8 +/- .75% | +/- .8% +/- .9 +/- .4% |
| *Iron (+) vs. Constantan (-) | J | 0 to +285 +285 to +750 | +/- 2.2 +/- .75% | +/- 1.1 +/- .4% | +32 to +545 +545 to +1400 | +/- 4 +/- .75% | +/- 2 +/- .4% |
| Chromel TM (+) vs. Constantan (-) | E | -200 to -170 -170 to +250 +250 to +340 +340 to +900 | +/- 1% +/- 1.7 +/- 1.7 +/- .5% | +/- 1 +/- 1 +/- .4% +/- .4% | -330 to -270 -270 to +480 +480 to +640 +640 to +1600 | +/- 1% +/- 3 +/- 3 +/- .5% | +/- 1.8 +/- 1.8 +/- .4% +/- .4% |
| Chromel TM (+) vs. *Alumel (-) | K | -200 to -110 -110 to -0 0 to +285 +285 to +1250 | +/- 2% +/- 2.2 +/- 2.2 +/- .75% | +/- 1.1 +/- .4% | -330 to -165 -165 to +32 +32 to +545 +545 to +2300 | +/- 2% +/- 4 +/- 4 +/- .75% | +/- 2 +/- .4% |
| Nicrosil (+) vs. Nisil (-) | N | 0 to +285 +285 to +1250 | +/- 2.2 +/- .75% | +/- 1.1 +/- .4% | +32 to +545 +545 to +2300 | +/- 4 +/- .75% | +/- 2 +/- .4% |
| Platinum-10% Rhodium (+) vs. Platinum (-) | S | 0 to +600 +600 to +1450 | +/- 1.5 +/- .25% | +/- .6 +/- .1% | +32 to +1110 +1110 to +2650 | +/- 2.7 +/- .25% | +/- 1.1 +/- .1% |
| Platinum-13% Rhodium (+) vs. Platinum (-) | R | 0 to +600 +600 to +1450 | +/- 1.5 +/- .25% | +/- .6 +/- .1% | +32 to +1110 +1110 to +2650 | +/- 2.7 +/- .25% | +/- 1.1 +/- .1% |
| Platinum-30% Rhodium (+) vs. Platinum-6% (-) | B | +870 to +1700 | +/- .5% | +/- .25% | +1600 to +3100 | +/- .5% | +/- .25% |
| Tungsten-5% Rhenium (+) vs. Tungsten-26% Rhenium (-) | C^ | +400 to +2300 | +/- 1% | - | +800 to +4200 | +/- 1% | - |
| (*) Magnetic | NOTE - Percent limits apply directly to temperatures in °C units, but for °F equivalents are applied to the number of °F above or below the ice point (+32°F). [i.e., Limit (°F) = (Temp.°F - 32°F) x Percentage] | ||||||
| TM (TradeMark, Hoskins Mfg Co.) | |||||||
| (^) Not ANSI/ASTM Type Symbol | |||||||
Thermocouple Extension Wire:
Thermocouple extension wire has approximately the same thermoelectric characteristic as thermocouple wire but its accuracy is guaranteed over a more limited range of temperatures. Thermocouple extension wire can offer advantages in cost or mechanical properties when used for connections between thermocouples and instruments. For base metal types of thermocouples, extension wire is substantially the same composition as the corresponding thermocouple type. For noble metal types, however, an entirely different alloy is formulated to match the noble metal characteristics over a specified temperature range. This is necessary due to the high cost of the noble metals which could otherwise be necessary for the interconnection. The “X” in the ANSI/ASTM code denotes extension grade wire.
| INITIAL CALIBRATION TOLERANCES FOR THERMOCOUPLE EXTENSION WIRE | |||||||
|---|---|---|---|---|---|---|---|
| THERMOCOUPLE TYPE | °C | °F | |||||
| Wire Alloys | ANSI/ASTM Type Symbol | Temperature Range | Standard Limits | Special Limits | Temperature Range | Standard Limits | Special Limits |
| Copperl (+) vs. Constantan (-) | T | -200 to -65 -65 to +130 +130 to +350 | +/- 1.5% +/- 1 +/- .75% | +/- .8% +/- .5 +/- .4% | -330 to -85 -85 to +270 +270 to +660 | +/- 1.5% +/- 1.8 +/- .75% | +/- .8% +/- .9 +/- .4% |
| *Iron (+) vs. Constantan (-) | J | 0 to +285 +285 to +750 | +/- 2.2 +/- .75% | +/- 1.1 +/- .4% | +32 to +545 +545 to +1400 | +/- 4 +/- .75% | +/- 2 +/- .4% |
| Chromel TM (+) vs. Constantan (-) | E | -200 to -170 -170 to +250 +250 to +340 +340 to +900 | +/- 1% +/- 1.7 +/- 1.7 +/- .5% | +/- 1 +/- 1 +/- .4% +/- .4% | -330 to -270 -270 to +480 +480 to +640 +640 to +1600 | +/- 1% +/- 3 +/- 3 +/- .5% | +/- 1.8 +/- 1.8 +/- .4% +/- .4% |
| Chromel TM (+) vs. *Alumel (-) | K | -200 to -110 -110 to -0 0 to +285 +285 to +1250 | +/- 2% +/- 2.2 +/- 2.2 +/- .75% | +/- 1.1 +/- .4% | -330 to -165 -165 to +32 +32 to +545 +545 to +2300 | +/- 2% +/- 4 +/- 4 +/- .75% | +/- 2 +/- .4% |
| Nicrosil (+) vs. Nisil (-) | N | 0 to +285 +285 to +1250 | +/- 2.2 +/- .75% | +/- 1.1 +/- .4% | +32 to +545 +545 to +2300 | +/- 4 +/- .75% | +/- 2 +/- .4% |
| Platinum-10% Rhodium (+) vs. Platinum (-) | S | 0 to +600 +600 to +1450 | +/- 1.5 +/- .25% | +/- .6 +/- .1% | +32 to +1110 +1110 to +2650 | +/- 2.7 +/- .25% | +/- 1.1 +/- .1% |
| Platinum-13% Rhodium (+) vs. Platinum (-) | R | 0 to +600 +600 to +1450 | +/- 1.5 +/- .25% | +/- .6 +/- .1% | +32 to +1110 +1110 to +2650 | +/- 2.7 +/- .25% | +/- 1.1 +/- .1% |
| Platinum-30% Rhodium (+) vs. Platinum-6% (-) | B | +870 to +1700 | +/- .5% | +/- .25% | +1600 to +3100 | +/- .5% | +/- .25% |
| Tungsten-5% Rhenium (+) vs. Tungsten-26% Rhenium (-) | C^ | +400 to +2300 | +/- 1% | - | +800 to +4200 | +/- 1% | - |
| (*) Magnetic | |||||||
| TM (TradeMark, Hoskins Mfg Co.) | |||||||
| (^) Not ANSI/ASTM Type Symbol | |||||||