| TABLE 1 THERMOCOUPLE WIRE TYPES |
| THERMOCOUPLE COMBINATIONS | Calibration Type | ARi SYMBOL | STANDARD LIMITS OF ERROR | RECOMMENDED TEMPERATURE RANGE |
| Platinum 10% Rhodium (+) Vs. Platinum (-) | S | S | ±1.5șC or .25% Per ASTM E-230 |
0-1450șC |
| Platinum 13% Rhodium (+) Vs. Platinum (-) | R | R | ±1.5șC or .25% Per ASTM E-230 |
0-1450șC |
Platinum 30% Rhodium (+) Vs. Platinum 6% Rhodium (-) |
B | B | ±0.5% | 870-1700șC |
| Tungsten 5% Rhenium (+) Vs Tungsten 26% Rhenium (-) | C | AE | ±4.4șC (0-426șC) ±1% (426-2315șC) Per ASTM E-988 |
0-2200șC
|
| Tungsten 3% Rhenium (+) Vs. Tungsten 25% Rhenium (-) | D | AO | ±4.4șC (0-426șC) ±1% (426-2315șC) Per ASTM E-988 |
0-2200șC
|
| TABLE 2 SHEATH MATERIALS |
| SHEATH TYPE | ARi SYMBOL | RECOMMENDED MAX. TEMP | MELTING TEMP. | ALLOWABLE ENVIRONMENT | STD SHEATH DIAMETERS (inches) |
MIN. BEND RADIUS |
| Inconel 600 | B | 1175șC. | 1345șC. | Inert, Vacuum, Oxidizing | 0.040, 0.062, 0.125, 0.188, 0.250 | 5 X Sheath Diameter |
| Platinum 10% Rhodium | AH | 1550șC. | 1850șC. | Inert, Oxidizing | 0.040, 0.062, 0.125 | 5 X Sheath Diameter |
| Tantalum | N | 2200șC. | 2995șC. | Inert, Vacuum | 0.040, 0.062, 0.125 | 10 X Sheath Diameter |
| Molybdenum | O | 2000șC. | 2620șC. | Inert, Vacuum, Reducing | 0.062, 0.125, 0.188, 0.250 | Do Not Bend |
| Niobium 1% Zirconium | AV | 2200șC. | 2495șC. | Inert, Vacuum | 0.062, 0.125 | 10 X Sheath Diameter |
| Coated Molybdenum | OCR | 1600șC. | 2000șC. | Inert, Oxidizing | 0.125, 0.250 | Do Not Bend |
| TABLE 3 INSULATION MATERIALS |
| INSULATION TYPE | ARi SYMBOL | RECOMMENDED MAX. OPERATING TEMPERATURE | APPROXIMATE MELTING TEMP. | COMMENTS |
| Magnesia (MgO) |
N | 1700șC. | 2800șC. | Very hygroscopic. Used mostly in compacted sheaths. |
| Alumina Oxide (Al2O3 ) | A | 1550șC. | 2040șC. | Excellent with Platinum alloys. |
| Hafnia Oxide (HfO2) |
H | 2200șC. | 2790șC. | Comparable to Beryllia Oxide and safe to handle |
| Beryllia Oxide* (BeO) |
B | 2200șC. | 2650șC. | Excellent High Temperature thermal conductivity and resistivity. |
|
*Beryllia is considered a toxic material and can cause health problems if particles are inhaled. |
| TABLE 4 SHEATH DIAMETER CODES |
| SHEATH
DIAMETER (inches) |
ARi Letter Code |
| 0.040 | A |
| 0.062 | B |
| 0.125 | D |
| 0.188 | E |
| 0.250 | F |
| TABLE 5 JUNCTION NUMBER CODES |
| SHEATH TYPE | WIRE TYPE LETTER TYPE | JUNCTION CODE GROUNDED | JUNCTION CODE UNGROUNDED |
| Inconel 600 | R, S, & B | (8.1) | (9.5) |
| Platinum 10% Rhodium | R, S, & B | 8 | 9 |
| Coated Molybdenum | AE & AO | N/A | (9.3) |
| Tantalum | R, S, B, AE, & AO | (8.1) | (9.5) |
| Molybdenum | R, S, & B | N/A | (9.4) |
| Molybdenum | AE & AO | N/A | (9.3) |
| Niobium 1% Zirconium | AE & AO | (8.1) | (9.5) |