
Butt-Welded Unsheathed  
Fine Gage Thermocouples
Butt-welded.
®
Important Ordering Notes
OMEGA offers  
a line of buttwelded bare wire 
thermocouples 
that provide a 
faster response 
time and can be 
used in tighter 
spaces than 
standard  
beaded wire 
thermocouples.
For Pricing 
and Details 
Visit omega.com/
thermocouples
Discount Schedule 
Base Metal Thermocouples
1 to 10 pkgs.........................Net 
11 to 24 pkgs........................5% 
25 to 49 pkgs......................10% 
50 and up............................15%
  Platinum/Rhodium Wire Dia. 
  [Additional Price Per 25 mm (1")]
0.25 mm (0.010")
Base Metal Thermocouples
Prices given for 300 mm (12") lengths. 
Other sizes and lengths are available 
on special order. A 300 mm (12") length 
corresponds to each leg for 600 mm 
(24") total length. To order longer lead 
lengths for base metal calibrations, 
there is an additional cost per 300 mm 
(12") per package. Visit omega.com for 
complete pricing and details.
Platinum/Rhodium 
Thermocouples
Prices given for 150 mm (6") lengths. 
Other sizes and lengths are available 
on special order. To order longer lead 
lengths for Pt/Rh calibrations, see the 
table below.
Note: Negative lead is identified with a red dot.
Pt/Rh Calibrations: 150 mm (6") 
Length Standard—Sold Individually
   Wire Dia.  Model 
 Calibration  mm (inch)  Number 
 Pt/13%Rh-Pt 0.25 (0.010) P13R-010-BW 
 Pt/10%Rh-Pt 0.25 (0.010) P10R-010-BW 
 Pt/30%Rh-  0.25 (0.010) P30R-010-BW  
 Pt/6%Rh- 
Note: Published price is based on  
market value at time of printing and is  
subject to change due to precious-metal 
market fluctuations.
Base Metal* Calibrations: 
300 mm (12") Length Standard
   Wire Dia.  Model 
 Calibration 
 Iron-  0.075 (0.003)† IRCO-003-BW 
 Constantan 0.125 (0.005)† IRCO-005-BW 
  0.25 (0.010) IRCO-010-BW 
  0.38 (0.015) IRCO-015-BW 
  0.5 (0.020) IRCO-020-BW 
  0.81 (0.032) IRCO-032-BW 
 CHROMEGA® 0.075 (0.003)† CHAL-003-BW 
 ALOMEGA 0.125 (0.005)† CHAL-005-BW 
  0.25 (0.010) CHAL-010-BW 
  0.38 (0.015) CHAL-015-BW 
  0.5 (0.020) CHAL-020-BW 
  0.81 (0.032) CHAL-032-BW 
 Copper-  0.075 (0.003)† COCO-003-BW 
 Constantan 0.125 (0.005)† COCO-005-BW 
  0.25 (0.010) COCO-010-BW 
  0.38 (0.015) COCO-015-BW 
  0.5 (0.020) COCO-020-BW 
  0.81 (0.032) COCO-032-BW 
 CHROMEGA® 0.075 (0.003)† CHCO-003-BW 
 Constantan 0.125 (0.005)† CHCO-005-BW 
  0.25 (0.010) CHCO-010-BW 
  0.38 (0.015) CHCO-015-BW 
  0.5 (0.020) CHCO-020-BW 
  0.81 (0.032) CHCO-032-BW
 Base metal thermocouples are made from 
*
special lmits of error wire.
† Maximum length 300 mm (12"). 
Ordering Example: CHAL-010-BW, 
Type K CHROMEGA®-ALOMEGA®  
butt-welded, unsheathed fine-gage 
thermocouple, package of 5.
Thermocouple insulator model numbers SH, 
DH, FS and OV also available at omega.com.
SPECIAL SIZES, ALLOYS OR ASSEMBLIES
Orders for special sizes, alloys or assemblies 
should be explicit and accompanied by 
Convenient 
Packages 
of 5
Shown smaller 
than actual size.
mm (inch)
a sketch or print, if possible.
 Number
A-19