Sensor catalog - Watlow - #21

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Text version of the page
A T
General Information
Application Hints
What are the maximum temperatures of thermocouples?
The diameter of the sensor wires determines the upper most operating temperature. The larger the diameter, the higher the temperature rating.
Recommended Upper Temperature Limit for Protected Thermocouple Wire
(D 3 (D
1
Thermocouple
No. 8
No. 20
No. 24
No. 28
Type
Gauge
Gauge
Gauge
Gauge
°C (°F)
°C (°F)
°C (°F)
°C (°F)
°C (°F)
B
3100 (1700)
E
870 (1600)
650(1200)
540 (1000)
430 (800)
430 (800)
J
760 (1400)
590(1100)
480 (900)
370 (700)
370 (700)
K and N
1260 (2300)
1090(2000)
980 (1800)
870 (1600)
870 (1600)
R and S
2700 (1480)
T
370 (700)
260 (500)
200 (400)
200 (400)
>
T3
i
c
i
o
3
3
k
o 3
0) -+
o
3
i
n
t
to
a This table gives the recommended upper temperature limits for the various thermocouples and wire sizes. These limits apply to protected thermocouples, that is, thermocouples in conventional closed-end protecting tubes. They do not apply to sheathed thermocouples having compacted mineral oxide insulation.
b The temperature limits given here are intended only as a guide to the user and should not be taken as absolute values nor as guarantees of satisfactory life or performance. These types and sizes are sometimes used at temperatures above the given limits, but usually at the expense of stability or life or both. In other instances, it may be necessary to reduce the above limits in order to achieve adequate service. ASTM MNL-12 (Manual on the Use of Thermocouples in Temperature Measurement, ASTM MNL-12, 1993) and other literature sources should be consulted for additional application information.
Choose alloy 600 over 304 SS or 316 SS when higher temperatures are expected.
The environment is another critical factor when determining the best material. Consult the manual on The Use of Thermocouples in Temperature Measurement, published by ASTM for further details.
Mineral Insulated Sensors by Diameter and Sheath
Sheath
Maximum Recommended
Diameter
Operating Temperature
in.
Calibration
Material
°C
(°F)
0.032
K
304 SS/Alloy 600
871
(1600)
0.032
J
304 SS
816
(1500)
0.040
K
304 SS/316 SS/Alloy 600
871
(1600)
0.040
J
304 SS
816
(1500)
0.040
T
304 SS
350
( 662)
0.040
E
304 SS
871
(1600)
0.063
K or N
Alloy 600
1093
(2000)
0.063
S
Alloy 600
1093
(2000)
0.063
J
304 SS/316 SS
816
(1500)
0.063
E
304 SS
871
(1600)
0.063
K
304 SS/316 SS
871
(1600)
0.063
K
Hastelloy® X
1204
(2200)
0.125
K or N
Alloy 600
1177
(2150)
0.125
T
304 SS/316 SS/Alloy 600
350
(662)
0.125
E
Alloy 600
871
(1600)
0.125
S
Alloy 600
1177
(2150)
0.125
J
304 SS/316 SS
816
(1500)
0.125
K
304 SS
871
(1600)
0.250
K or N
Alloy 600
1177
(2150)
0.250
J
304 SS/310 SS/316 SS
816
(1500)
0.250
K
304 SS
871
(1600)
0.250
T
304 SS
350
(662)
0.250
E
304 SS/316 SS
871
(1600)
0.250
K
310 SS
1093
(2000)
0.250
K
316 SS
871
(1600)
0.250
T
316 SS
350
(662)
0.250
K
446 SS
1149
(2100)
Hastelloy* is a registered trademark of Haynes International.
21

pageCatalog pdf di En 2012-02-06-12