Sheet 8745-1 Page 3
RECOMMENDED TEMPERATURE LIMITS FOR PROTECTED THERMOCOUPLE
8 Gauge
14 Gauge
20 Gauge
24 Gauge
30 Gauge
Minimum Temperature
Maximum Temperature
Thermocouple Type
C
F
C
F
C –
F
C
F
C
F
C
F
Type T (Copper, Constantan) Type J (Iron, Constantan) Type E (Chromel, Constantan) Type K (Chromel, Alumel)
–184
–300
–
–
– 260
500 900 1000 1800
204 371 427
400 204 400
–18
0
760 871
1400 1600
593 649
1100 482 1200 538
700 371
700
–184
–300
800 427 800
–18 –18 –18 –18 –18
0 0 0 0 0
1260
2300 1093 2000 982
871 1600 871 1600
Type R and Type S
– – – –
– – – –
– – – –
– – – – – – – –
– 1482 2700 – 1705 3100 – 1985 3600 – 2330 4200
– – – –
– – – –
Type B
40% Iridium-60% Rhodium, Iridium Tungsten, 5% Rhenium-Tungsten, 26% Rhenium Tungsten, Tungsten-26% Rhenium
–18
0
–
–
–
– –
– 2330 4200
–
–
† Trademark Hoskins Manufacturing Co. ‡ Type K Thermocouple wire is manufactured under such trademarks as Chromel-Alumel (Hoskins Manufacturing Co.), Tophel-Nial (W. B. Driver Co.), T1-T2 (Driver-Harris Co.) etc.
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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