APPENDIX MELSEC-A
A-1
APPENDIX
Appendix 1 Usual Operation Limits and Superheated Operating Limits
JIS C1602-1995
Component
symbol
Old symbol
(reference)
Wire diameter
mm
Usual operation limit
°C
Superheated operating
limit °C
B ⎯ 0.50 1500 1700
R
S
0.65 650 850
1.00 750 950
K CA 1.60 850 1050
2.30 900 1100
3.20 1000 1200
0.65 450 500
1.00 500 550
E CRC 1.60 550 600
2.30 600 750
3.20 700 800
0.65 400 500
1.00 450 550
J IC 1.60 500 600
2.30 550 750
3.20 600 750
0.32 200 250
T CC 0.65 200 250
1.00 250 300
1.60 300 350
Note : The usual operation limit refers to the temperature limit of the air in which the module can be
continuously used.
The superheated operating limit refers to the limit of temperature at which the module can be
used in a short period of time in unavoidable cases.
Appendix 2 Allowable Temperature Differences
JIS C1602-1995
Component
symbol
Old symbol
(reference)
Measured temperature Class Allowable difference
B ⎯ 600 °C or more but less than 1700 °C 0.5 class ±4 °C, or ±0.5 % of the measured temperature
R
S
0 °C or more but less than 1000 °C 0.4 class ±1.5 °C, or ±0.4 % of the measured temperature
K CA 0 °C or more but less than 1200 °C 0.75 class ±2.5 °C, or ±0.75 % of the measured temperature
-200 °C or more but less than 0 °C 1.5 class ±2.5 °C, or ±1.5 % of the measured temperature
0 °C or more but less than 800 °C 0.4 class ±1.5 °C, or ±0.4 % of the measured temperature
E CRC 0 °C or more but less than 800 °C 0.75 class ±2.5 °C, or ±0.75 % of the measured temperature
-200 °C or more but less than 0 °C 1.5 class ±2.5 °C, or ±1.5 % of the measured temperature
J IC 0 °C or more but less than 750 °C 0.4 class ±1.5 °C, or ±0.4 % of the measured temperature
0 °C or more but less than 750 °C 0.75 class ±2.5 °C, or ±0.75 % of the measured temperature
0 °C or more but less than350 °C 0.4 class ±0.5 °C, or ±0.4 % of the measured temperature
T CC 0 °C or more but less than350 °C 0.75 class ±1 °C, or ±0.75 % of the measured temperature
-200 °C or more but less than 0 °C 1.5 class ±1 °C, or ±1.5 % of the measured temperature
Note : The allowable difference refers to the maximum allowable limit for the difference between the
resultant temperature of a conversion from thermal electromotive force using a standard
thermal electromotive force chart, and the temperature at temperature detector contact.
The greater value of °C or % will take effect for the allowable difference.
⎯ 0.50
1400
1600
⎯ 0 °C or more but less than 1600 °C
0.25 class
±1.5 °C, or ±0.25 % of the measured temperature
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