Fine Gage Bare Wire Thermocouple Elements (Pack of 5)

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OMEGA Engineering

Unsheathed Fine Diameter Thermocouples for fast response. Diameters down to 0.025 mm. High Accuracy. Pin-Point Measurements. Low Heat Transfer. More

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OMEGA™ fine-diameter 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 diameters ranging from 0.05 mm to 0.81 mm. All fine-gauge thermocouples are made from carefully selected materials. To ensure consistent thermoelectric properties, each pack contains thermocouples made from matched pairs of wire within the same batch number. When specified, several packs of thermocouples made from the same batch can be supplied at no extra charge.

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.

Base Metal Thermocouples. (Supplied in packs of 5)
Prices given for 300mm lengths. Other diameters and lengths are available on special order. A 300mm length corresponds to a 600mm loop.

Platinum/Rhodium Thermocouples. (Supplied individually)
Prices given for 150mm lengths. Other diameters and lengths are available on special order. A 150mm length corresponds to a 300mm loop.

You can order the probe, including the installation of connector. Put the required connector in the basket together with the probe. If needed, order the required connector separately, see "Related Products" below.
Complete informations can be found in the spec sheet (PDF), see the "Download" section.

SPECIFICATIONS:

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
593°C
593°C
149°C
315°C
-
-
371°C
871°C
871°C
204°C
426°C
-
-
371°C
871°C
871°C
204°C
426°C
1450°C
1700°C
482°C
982°C
982°C
260°C
593°C
1450°C
1700°C

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 diameter thermocouples.
** Do not expose to oxidizing atmospheres.

Table 2:

Response Time *

Wire Size
mm
Still Air
427°C/38°C
60 ft./sec Air
427°C/38°C
Still H2O
93°C/38°C
0.025
0.125
0.381
0.75
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 and 38°C air between 93°C and 38°C water.