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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