Thermocouple, Manufacturer of Thermocouple, Thermocouple Type, Thermocouple Assemblies, Resistance Temperature Detectors, India

Nutech Engineers
143-D Government Industrial Estate, Kandivli West, Mumbai - 400 067

Phone : 91-22-28683549 / 28684580,  Fax : 91-22-28674580
email : nutechen@vsnl.com , nutechen@bol.net.in,
info@nutechengineers.comsales@nutechengineers.com

Temperature Sensing Devices


SECTION - 7
Technical Information

Limits of Error Thermocouples

Type

Temperature Range oC
for Standard Limits of Error

Standard Limits of
Error

Temperature Range oC for Special Limits of Error Special Limits
of Error
J 0-293 2.2oC 0 to 275 1.1oC
293 to 760 0.75% 275 to 760 0.4%
K -200 to -110 2% *   *
-110 to 0 2.2oC*   *
0 to 293 2.2oC 0 to 275 1.1oC
293 to 1250 0.75% 275 to 1250 0.4%
T -200 to -67 1.5%*   *
-67 to 0 1oC*   *
0 to 133 1oC 0 to 125 0.5oC
133 to 350 0.75% 125 to 350 0.4%
E -200 to -170 1%*   *
-170 to 0 1.7oC*   *
0 to 340 1.7oC 0 to 250 0.1oC
340 to 900 0.5% 250 to 900 0.4%
R 0 to 600 1.5oC 0 to 600 0.6oC
600 to 1450 0.25% 600 to 1450 0.1%
S 0 to 600 1.5oC 0 to 600 0.6oC
600 to 1450 0.25% 600 to 1450 0.1%
B 800 to 1700 0.5% 800 to 1700 -

*    Thermocouples and thermocouple materials are supplied to meet the limits of error specified or temperatures above 0oC.  A thermocouple material may  not  confirm  to the published sub-zero limits of error for that  material  when  purchased, unless conformance is agreed to between customer and supplier.

** Special limits of error for sub-zero temperatures have not yet been established. The following limits for calibrations E and T are useful to start discussion between customer and supplier.

                                                -200 to 0oC
                    Type E  1oC or 0.5%, whichever is greater
                    Type T  0.5oC or 0.8%, whichever is greater

     Sub-zero limits of error for Type J and sub-zero special limits of error  for Type K are not considered because of the characteristics of the materials.

ANSI Limits of Error Extension Wire and Compensating Extension
Reference Junction 0oC

Type Temperature Range oC Standard Special
JX 0 to 200   2.2oC   1.1oC
KX 0 to 200 2.2oC -
TX -60 to +100   1.0oC 0.5oC
EX 0 to 200   1.7oC -

Compensating Extension Wire

RX - SX
(Copper/#11 Alloy)
0 to 200   5oC
  0.057 mV
-
BX
(Copper/Copper)
0 to 100 +0, -3.7oC
+0, - .033mV
-

The degree C limits of error are based on a measuring junction temperature greater than 870oC for Types SX and RX, 1000oC for Type BX.

Non ANSI Limits of Error Thermocouples

Type Temperature Range, oC Limits of Error
W-W, 26% Re 0 to 427 4.4oC
427 to 2316 1%
W, 5% Re-W, 26% Re 0 to 427 4.4oC
427 to 2316 1%
W, 3% Re-W, 25% Re 0 to 427 4.4oC
427 to 2316 1%
Platinel II
(Platinel 5355/Platinel 7674)
0 to 600 0.10mV
600 to 700 0.15mV
700 to 1300 0.20mV

Non ANSI Limits of Error Compensating Extension Wire

Type Temperature Range, oC Limits of Error
Alloy 200/Alloy 226
for W-W, 26% R
0 to 260 0.14mV
Ally 203/Alloy 225
for W, 3% Re-W 25% Re
0 to 260 0.11mV
Ally 405/Alloy 426
for W, 5% Re-W, 26% Re
0 to 871 0.11mV
Chromel P/Alloy 30*
for Platinel 5355/ Platinel 7674
0 to 100 1oC
100 to 200 6.4oC

*For Extension wire/thermocouple wire
  Junction temperature (both equal) above about 800oC
  Type K wire may be used with minimal error.

Limits of error apply only to thermocouples supplied by the manufacturer.  The calibration of a thermocouple may change because of the influence of such factors as temperature, temperature cycling, and time.


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By JPN