High Temp Thermocouples with Ceramic Tubes and Heads

Type R, S, or B Platinum Thermocouple enclosed in a high purity alumina protection tube. Standard construction includes cast iron NB1-2 connection head and 1/2" NPT fitting. For use at temperatures up to 1650°C (3000°F). Elements are insulated by a double bore high purity hard-fired alumina insulator.

Assemblies

Model Number	Thermocouple Calibration	AWG Wire Size	Protection Tube OD mm (in.)	Insulator OD mm (in.)
RAT-30-12"	R (Pt/13%Rh vs Pt)	30	6.0 (1/4)	3.0 (1/8)
RAT-24-12"	R (Pt/13%Rh vs Pt)	24	6.0 (1/4)	3.0 (1/8)
RAT-20-12"	R (Pt/13%Rh vs Pt)	20	9.5 (3/8)	4.5 (3/16)
SAT-30-12"	S (Pt/10%Rh vs Pt)	30	6.0 (1/4)	3.0 (1/8)
SAT-24-12"	S (Pt/10%Rh vs Pt)	24	6.0 (1/4)	3.0 (1/8)
SAT-20-12"	S (Pt/10%Rh vs Pt)	20	9.5 (3/8)	4.5 (3/16)
BAT-30-12"	B (Pt30%Rh vs Pt/6%Rh)	30	6.0 (1/4)	3.0 (1/8)
BAT-24-12"	B (Pt30%Rh vs Pt/6%Rh)	24	6.0 (1/4)	3.0 (1/8)
BAT-20-12"	B (Pt30%Rh vs Pt/6%Rh)	20	9.5 (3/8)	4.5 (3/16)

Note: Alumina tube shipped separately to avoid breakage. Shipped unassembled.

Replacement Elements for Assemblies Shown Above

Type of Element	AWG Wire Size	Insulator 99.7% + Al2O3	Type S Pt/10%Rh-Pt	Type R Pt/13%Rh-Pt	Type B Pt/30%Rh- Pt/6%Rh
Bare wires (No Insulators)	20 24 30	N/A N/A N/A	BARE-20-S-12 BARE-24-S-12 BARE-30-S-12	BARE-20-R-12 BARE-24-R-12 BARE-30-R-12	BARE-20-B-12 BARE-24-B-12 BARE-30-B-12
Double-Hole Round Insulators	20 24 30	XDH-20 XDH-24 XDH-30	XDH-20-S-12 XDH-24-S-12 XDH-30-S-12	XDH-20-R-12 XDH-24-R-12 XDH-30-R-12	XDH-20-B-12 XDH-24-B-12 XDH-30-B-12

* Replacement elements include leads of sufficient length to reach terminals in head.

Wire Size Conversion

AWG	Actual Diameter
6 8 10 12 14 16 18 20 22 24 26 30	4.1 mm (0.162") 3.2 mm (0.128") 2.5 mm (0.102") 2.0 mm (0.081") 1.6 mm (0.064") 1.2 mm (0.051") 1.0 mm (0.040") 0.8 mm (0.032") 0.6 mm (0.0253") 0.5 mm (0.0201") 0.41 mm (0.0159") 0.25 mm (0.0100")

View the Thermocouple Accuracy and Color Code charts