Products
Thermocouple Wire
Accuracy
of Marlin Wire:
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 |
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THERMOCOUPLE
TYPE |
°C |
°F |
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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] |
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TM (TradeMark, Hoskins Mfg Co.) |
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(^)
Not ANSI/ASTM Type Symbol |
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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 |
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THERMOCOUPLE
TYPE |
°C |
°F |
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Extension
Wire Alloys |
ANSI/ASTM Type Symbol |
Temperature
Range |
Standard
Limits |
Special
Limits |
Temperature
Range |
Standard
Limits |
Special
Limits |
Copperl
(+) vs. Constantan (-) |
TX |
-60°
to +100° |
+/-
1° |
+/-
.5° |
-75°
to +210° |
+/-
2 ° |
+/-
1 ° |
*Iron
(+) vs. Constantan (-) |
JX |
0°
to +200° |
+/-
2.2° |
+/-
1.1° |
+32°
to +400° |
+/-
4° |
+/-
2° |
Chromel
TM (+) vs. Constantan (-) |
EX |
+0°
to +200° |
+/-
1.7° |
+/-
1.1° |
+32°
to +400° |
+/-
3° |
+/-
2° |
Chromel
TM (+) vs. *Alumel (-) |
KX |
0°
to +200° |
+/-
2.2° |
+/-
1.1° |
+32°
to +400° |
+/-
4° |
+/-
2° |
Nicrosil
(+) vs. Nisil (-) |
NX |
0°
to +200° |
+/-
2.2° |
+/-
1.1° |
+32°
to +400° |
+/-
4° |
+/-
2° |
Copper
(+) vs. Copper Alloy(-) |
SX RX |
+25°
to +200° |
+/-
7° |
- |
+75°
to +400° |
+/-
12° |
- |
PCLW630
vs. Copper |
BX |
0°
to +200° |
+/-
2.2° |
- |
+75°
to +400° |
+/-
4° |
- |
Copper
vs. Copper |
BX |
0°
to +65° |
+/-
1° |
- |
+32°
to +150° |
+/-
2° |
- |
Alloy
405 vs. Alloy 426 |
CX^ |
0°
to +870° |
+/-
7° |
- |
+32°
to +1600° |
+/-
12° |
- |
(*)
Magnetic |
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TM (TradeMark, Hoskins Mfg Co.) |
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(^)
Not ANSI/ASTM Type Symbol |
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