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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 0.013mm to 0.81mm. 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.
Maximum Service Temperature (Table 1)
** Do not expose to oxidising atmospheres.
Table 1 lists maximum service temperatures for long term exposures of bare wire thermocouples. For very short exposure times, temperatures of the fine-gauge thermocouples can be as high as the permissible temperatures for the 0.8 mm diameter thermocouples.
Thermocouple Response Time* (Table 2)
Wire Dia. mm
Still Air 427°C/38°C
18 m/sec Air 427°C/38°C
Still Water 93°C/38°C
*The time constant is defined as the time required to reach 63.2% of an instantaneous temperature change. The data for Table 2 is obtained by measuring the time required for a Type J fine-gauge 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 in air and between 93°C and 38°C in water.
The most popular models are shown in the "To Order" table below. If the model you require is not in the table then please use the "Part Number Builder" below to obtain pricing, availability and order on-line.
† All amounts shown in EUR, GBP, or USD Note: 0.013mm diameter wires supplied 200mm long, maximum length 300mm. Shorter lead is negative lead.. Thermocouples 0.125mm dia and larger are made with class 1 tolerance thermocouple wire. Order Thermocouple insulators separately, eg DH-1-24 Ordering Example: (1) CHAL-001 Pack of 5 K Type bare wire thermocouples, unsheathed, 0.025mm diameter, 300mm long, £33.50
Part Number Builder
Build Your Part Number Below
Thermocouple Type select from: CHAL for K Type COCO for T Type IRCO for J Type OPON for N Type CHCO for E Type P13R for R Type P10R for S Type P30R for B Type
Wire Diameter select from: 0005 for 0.013mm (0.0005") Diameter (For K and E Type Only) 001 for 0.025mm (0.001") Diameter 002 for 0.050mm (0.002") Diameter 003 for 0.075mm (0.003") Diameter 005 for 0.125mm (0.005") Diameter 008 for 0.2mm (0.008") for R and S type only 010 for 0.25mm (0.010") Diameter 015 for 0.38mm (0.015") Diameter 020 for 0.5mm (0.020") Diameter 032 for 0.81mm (0.032") Diameter
Note: All combinations may not be valid, check spec sheet for valid part numbers.
ORX, ORA, ORM, TRX, TRA, TRM, FRX,FRA, and FRM Series