Unsheathed Fine Gage Microtemp Thermocouples, J, K, T, E, R &S

IRCO, CHAL, P13R AND P10R

Thermocouples, J, K, T, E, R &S

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•	Fast Response
•	Diameters down to .0005"
•	High Accuracy
•	Pin-Point Measurements
•	Low Heat Transfer
View related products - Thermocouples

ANSI Symbol

J	Iron/Constantan	N	OMEGA-P®, OMEGA-N®
K	CHROMEGA®/ALOMEGA®	R	Pt 13% Rh/Pt
T	Copper/Constantan	S	Pt 10% Rh/Pt
E	CHROMEGA®/Constantan	B	Pt 6% Rh/Pt 30% Rh

Table 1

Maximum Service Temperature

Thermocouple Type	0.13 mm (0.005")	0.38 mm (0.015")	0.51 mm (0.020")	0.81 mm 0.032
J** K N T E R,S B	315°C (600°F) 593°C (1100°F) 593°C (1100°F) 149°C (300°F) 315°C (600°F) - -	371°C (700°F) 871°C (1600°F) 871°C (1600°F) 204°C (400°F) 426°C (800°F) - -	371°C (700°F) 871°C (1600°F) 871°C (1600°F) 204°C (400°F) 426°C (800°F) 1450°C (2642°F) 1700°C (3092°F)	482°C (900°F) 982°C (1800°F) 982°C (1800°F) 260°C (500°F) 593°C (1100°F) 1450°C (2642°F) 1700°C (3092°F)

Table 1 lists maximum service temperatures for long term exposures of bare wire thermocouples. For very short exposure times, temperatures of the fine gage thermocouples can be as high as the permissible temperatures for the 0.8 mm (0.032") diameter thermocouples.
** Do not expose to oxidizing atmospheres.

Table 2

Response Time *

Wire Size mm (inches)	Still Air 427°C/38°C 800°F/100°F	60 ft./sec Air 427°C/38°C 800°F/100°F	Still H2O 93°C/38°C 200°F/100°F
0.025 (0.001) 0.125 (0.005) 0.381 (0.015) 0.75 (0.032)	0.05 sec 1.0 sec 10.0 sec 40.0 sec	0.004 sec 0.08 sec 0.80 sec 3.2 sec	0.002 sec 0.04 sec 0.40 sec 1.6 sec

*The time constant is defined as the time required to reach 63.2% of an instantaneous temperature change. The data for Table 2 are obtained by measuring the time required for a Type J fine gage thermocouple to reach 63.2% of its final temperature when its junction is alternately exposed to two different temperature levels. In this case, the time constant was measured for exposures between 427°C (800°F) and 38°C (100°F) air between 93°C (200°F) and 38°C (100°F) water.

Fine Gage Thermocouples
OMEGA® fine gage thermocouples are used whenever fast, accurate temperature measurements are required. The fine wire diameters enable accurate temperature measurements without disturbing the base temperature of the body, in which the installation is made, by keeping heat transfer via the leads to a minimum. Also, the fine junction permits accurate “pin-pointing” of the measured values. They are available in wire sized ranging from 0.0005" to 0.032" in diameter. All fine gage thermocouples are made from carefully selected materials. To insure consistent thermoelectric properties, each package contains thermocouples made from matched pairs of wire within the same lot number. When specified, several packages of thermocouples made from the same lot number can be supplied at no extra charge.

Response Time
While thermocouple response is a function of medium of submersion, wire diameter, alloy type and temperature level, it is possible to use Table 2 as a guide for comparing the various wire size thermocouples.

Important Ordering Notes

Base Metal Thermocouples
Prices given for 12 inch lengths (package of 5). Other sizes and lengths are available on special order. A 12 inch length corresponds to a 24 inch loop. To order longer lead lengths for base metal calibrations, add $4 per foot per package.

Platinum/Rhodium Thermocouples
Prices given for 6 inch lengths (sold individually). Other sizes and lengths are availableon special order. A 6 inch length corresponds to a 12 inch loop. To order longer lead lengths for Pt/Rh calibrations, see the table below.

Base Metal Calibrations: 300 mm (12") Length Standard

Calibration	Wire Dia. mm (in)	Model Number
J Iron Constantan	0.025 (0.001) 0.050 (0.002) 0.075 (0.003) 0.125 (0.005) 0.25 (0.010) 0.38 (0.015) 0.5 (0.020) 0.81 (0.032)	IRCO-001 IRCO-002 IRCO-003 IRCO-005 IRCO-010 IRCO-015 IRCO-020 IRCO-032
T Copper Constantan	0.025 (0.001) 0.050 (0.002) 0.075 (0.003) 0.125 (0.005) 0.25 (0.010) 0.38 (0.015) 0.5 (0.020) 0.81 (0.032)	COCO-001 COCO-002 COCO-003 COCO-005 COCO-010 COCO-015 COCO-020 COCO-032
N OMEGA-P® OMEGA-N®	0.075 (0.003) 0.125 (0.005) 0.25 (0.010) 0.50 (0.020) 0.81 (0.032)	OPON-003 OPON-005 OPON-010 OPON-020 OPON-032

Calibration	Wire Dia. mm (in)	Model Number
K CHROMEGA® ALOMEGA®	† 0.013 (0.0005) 0.025 (0.001) 0.050 (0.002) 0.075 (0.003) 0.125 (0.005) 0.25 (0.010) 0.38 (0.015) 0.50 (0.020) 0.81 (0.032)	CHAL-0005 CHAL-001 CHAL-002 CHAL-003 CHAL-005 CHAL-010 CHAL-015 CHAL-020 CHAL-032
E CHROMEGA® Constantan	0.013 (0.0005†) 0.025 (0.001) 0.050 (0.002) 0.075 (0.003) 0.125 (0.005) 0.25 (0.010) 0.38 (0.015) 0.50 (0.020) 0.81 (0.032)	CHCO-0005 CHCO-001 CHCO-002 CHCO-003 CHCO-005 CHCO-010 CHCO-015 CHCO-020 CHCO-032

†0.013 mm (0.0005") diameter wires supplied with 200 mm (8") leads, maximum length 300 mm (12").
Note: Shorter lead is negative lead.

Pt/Rh Calibrations: 150 mm (6") Length Standard – Sold Individually

Calibration	Wire Dia. mm (in)	Model Number
R Pt/13%Rh- Pt	0.025 (0.001) 0.050 (0.002) 0.075 (0.003) 0.125 (0.005) 0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.50 (0.020) 0.81 (0.032)	P13R-001 P13R-002 P13R-003 P13R-005 P13R-008 P13R-010 P13R-015 P13R-020 P13R-032

Calibration	Wire Dia. mm (in)	Model Number
S Pt/10%Rh- Pt	0.025 (0.001) 0.050 (0.002) 0.075 (0.003) 0.125 (0.005) 0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.50 (0.020) 0.81 (0.032)	P10R-001 P10R-002 P10R-003 P10R-005 P10R-008 P10R-010 P10R-015 P10R-020 P10R-032

Pt/Rh Calibrations: 150 mm (6") Length Standard – Sold Individually

Calibration	Wire Dia. mm (in)	Model Number
B Pt/30%Rh- Pt/6%Rh-	0.20 (0.008) 0.25 (0.010) 0.38 (0.015) 0.50 (0.020) 0.81 (0.032)	P30R-008 P30R-010 P30R-015 P30R-020 P30R-032

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Part Number	Availability	Price	Description	RoHS	Qty.

J Type Thermocouples. (See Part Number Builder below for more variations)

IRCO-003		$23.00	J Type Thermocouple, Unsheathed, Diameter: 0.003", Length: 12"		qty.

IRCO-010		$18.00	J Type Thermocouple, Unsheathed, Diameter: 0.010", Length: 12"		qty.


K Type Thermocouples. (See Part Number Builder below for more variations)

CHAL-005		$18.00	K Type Thermocouple, Unsheathed, Diameter: 0.005", Length: 12"		qty.

CHAL-010		$18.00	K Type Thermocouple, Unsheathed, Diameter: 0.010", Length: 12"		qty.

CHAL-020		$18.00	K Type Thermocouple, Unsheathed, Diameter: 0.020", Length: 12"		qty.


T Type Thermocouples. (See Part Number Builder below for more variations)

COCO-001		$25.00	T Type Thermocouple, Unsheathed, Diameter: 0.001", Length: 12"		qty.

COCO-003		$23.00	T Type Thermocouple, Unsheathed, Diameter: 0.003", Length: 12"		qty.


E Type Thermocouples. (See Part Number Builder below for more variations)

CHCO-002		$23.00	E Type Thermocouple, Unsheathed, Diameter: 0.002", Length: 12"		qty.

CHCO-010		$18.00	E Type Thermocouple, Unsheathed, Diameter: 0.010", Length: 12"		qty.


N Type Thermocouples. (See Part Number Builder below for more variations)

OPON-003	1 Week	$28.00	N Type Thermocouple, Unsheathed, Diameter: 0.003", Length: 12"		qty.

OPON-005	1 Week	$21.00	N Type Thermocouple, Unsheathed, Diameter: 0.005", Length: 12"		qty.


R Type Thermocouples. (See Part Number Builder below for more variations)

P13R-001		$40.00	R Type Thermocouple, Unsheathed, Diameter: 0.001", Length: 6"		qty.

P13R-002		$40.00	R Type Thermocouple, Unsheathed, Diameter: 0.002", Length: 6"		qty.


S Type Thermocouples. (See Part Number Builder below for more variations)

P10R-005		$55.00	S Type Thermocouple, Unsheathed, Diameter: 0.005", Length: 6"		qty.

P10R-008		$90.00	S Type Thermocouple, Unsheathed, Diameter: 0.008", Length: 6"		qty.


B Type Thermocouples. (See Part Number Builder below for more variations)

P30R-008	1 Week	$110.00	B Type Thermocouple, Unsheathed, Diameter: 0.008", Length: 6"		qty.

P30R-010		$160.00	B Type Thermocouple, Unsheathed, Diameter: 0.010", Length: 6"		qty.

† All dollar amounts on this site are shown in US currency.

Note: 0.0005" diameter wires supplied with 8" leads, maximum length 12".
Shorter lead is negative lead..
Thermocouples .005" Dia and larger are made with Special Limits of Error Wire. Order Thermocouples insulators separately, eg DH-1-24

Part Number Builder

(1)		(2)
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Option Descriptions

(1)

Thermocouple Type

Select
IRCO for J Type
CHAL for K Type
COCO for T Type
CHCO for E Type
OPON for N Type
P13R for R Type
P10R for S Type
P30R for B Type

(2)

Wire Diameter

Select
0005 for 0.0005" Diameter (For K and E Type Only)
001 for 0.001" Diameter
002 for 0.002" Diameter
003 for 0.003" Diameter
005 for 0.005" Diameter
008 for 0.008" Diameter(For R and S type only)
010 for 0.010" Diameter
015 for 0.015" Diameter
020 for 0.020" Diameter
032 for 0.032" Diameter

NOTE: All combinations may not be valid, check spec sheet for valid part numbers.

Related Links - Related Products

Related Products

	Thermocouple Accuracy and Color Codes:
	ANSI or IEC Color Codes, thermocouple accuracies, and limits of error

	General Thermocouple Specifications:
	Color Codes for Thermocouples, Wire and Connectors, tolerances, special limits of error, reference guide

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