NBS 125

58145c1f-e129-4ce8-ab70-ed8bbf9cc390 38 6 12 decimal

&[DATE] &[TIME] - &[FILENAME]

Both fits recovered from "reduced"

NBS 125

T 6.25629 - 268.935 - 6.22919 - 259.340 - 6.19773 - 252.870 - 6.17138 - 248.595 - 6.15358 - 246.048 - 5.87302 - 218.789 - 5.75328 - 210.002 - 5.53559 - 195.802 - 5.31472 - 182.962 - 2.74070 - 78.476 - 1.43494 - 38.862 - 00 1.0679 26.87 4.2773 100 5.3414 122.37 7.0364 156.634 11.0133 231.9681 13.2188 271.442 16.0953 321.108 16.4733 327.502 18.2179 356.66 212 mat :

J 8.0957 - 210.002 - 7.7963 - 195.802 - 7.4807 - 182.962 - 3.7187 - 78.476 - 1.9063 - 38.862 - 00 1.3739 26.87 5.2677 100 6.4886 122.37 8.3743 156.634 12.5517 231.9681 14.7427 271.442 17.4928 321.108 17.8462 327.502 19.456 356.66 22.9259 419.58 24.3123 444.674 30.1095 548.23 34.9108 630.74 36.6933 660.37 55.669 961.93 61.716 1064.43 62.880 1084.5 232 mat :

data char size clr plot k 1 data rows range r3 k el char : r4 k el size : r5 k el clr : 13 mat for data r3 r4 r5 augment 21 line :

T T . 12 blacj plot : J J . 12 red plot : 21 sys

NBS Monograph 125

T J 2 1 sys

__ Type 'T' Thermocouple __

-268.935 . . . 356.66 °C

]]> 'c' coefficients

c 2.06616508306782 108 -^* 1.04086361374117 104^* - 337.097030645294 - 556.796817063866 23.5682134277668 1.24287589943351 - 1.66276414822246 0.18965762016879 3.34581525265509 103 -^* 402.356136811016 - 25.1336669438927 - 21.753666487766 1.52017639703213 0.050935169713453 - 0.0639853127034 9.23623646847396 103 -^* 2.57197875267178 104 -^* 171 mat :

c 2.0662 108 -^* 10408.63613741 - 337.097030645294 - 556.796817063866 23.568213427767 1.242875899434 - 1.662764148222 0.189657620169 0.003345815253 402.356136811016 - 25.133666943893 - 21.753666487766 1.520176397032 0.050935169713 - 0.063985312703 0.009236236468 0.000257197875 171 mat :

recover from 
reduced  Padé x T x c 1 el c 2 el x * + c 3 el x 2^* + c 4 el x 3^* + c 5 el x 4^* + c 6 el x 5^* + c 7 el x 6^* + c 8 el x 7^* + c 9 el x 8^* + 1 c 10 el x * + c 11 el x 2^* + c 12 el x 3^* + c 13 el x 4^* + c 14 el x 5^* + c 15 el x 6^* + c 16 el x 7^* + c 17 el x 8^* + / * :

x °C 6.256 - x ≤ (x 18.218 ≤ (& x T out range if :

°C T 0 : mV 6.26 - 18.25 6.2 - range : i 1 mV rows range T i el mV i el T eval : for mV T augment 41 line :

7.036 T 156.628

recast code 
complies MCD ΔT X Y Y X T - vectorize 3 round vectorize augment :

X T 1 col : Y T 2 col : XY X Y augment : T XY . 12 black plot : 41 line

°C 1 :

5 T °C 115.268

Type 'T' ultimate fit to NBS 125

T °C 2 1 sys

ΔT 6.256 - 268.935 - 0.001 6.229 - 259.34 - 0 6.198 - 252.87 - 0 6.171 - 248.595 - 0 6.154 - 246.048 - 0 5.873 - 218.789 - 0.001 5.753 - 210.002 - 0.002 - 5.536 - 195.802 - 0.001 5.315 - 182.962 - 0.001 - 2.741 - 78.476 - 0 1.435 - 38.862 - 0000 1.068 26.87 0 4.277 1000 5.341 122.37 0.001 7.036 156.634 0.002 - 11.013 231.968 0.005 13.219 271.442 0.006 - 16.095 321.108 0 16.473 327.502 0.001 18.218 356.66 0213 mat

Calibrate the 'T' mV/I converter

XmV 100 - :

XmV °C ≡

mV 1 :

mV T XmV - mV 5 - 2 - solve mV 3.3787 -

Low range : -100°C => -3.3787mV

3.3787 - (3.3787 - T * 337.87

XmV 200 :

XmV °C ≡

mV 1 :

mV T XmV - mV 811 solve mV 9.2866

High range : 200°C => 9.2866mV

9.2866 9.2866 T * 1857.32

__ Type 'J' Thermocouple __

-210.002 . . . 1084.5 °C

]]> 'c' normalised coefficients

c 19.8518394369938 3.39708430077966 0.052276519294839 8.91649190043396 103 -^* - 9.92828185332406 105 -^* 8.38053206800752 106 -^* 3.1464248690302 107 -^* - 4.25243756863902 109 -^* 2.07174891774966 1011 -^* - 0.183112912617708 3.87083881009766 103 -^* 5.08713285834413 104 -^* - 2.26745307368593 106 -^* 6.6275111583499 107 -^* 2.21691344604783 108 -^* - 2.87497042511128 1010 -^* 1.36525976453514 1012 -^* - 171 mat :

recover 
reduced x J1084 x c 1 el c 2 el x * + c 3 el x 2^* + c 4 el x 3^* + c 5 el x 4^* + c 6 el x 5^* + c 7 el x 6^* + c 8 el x 7^* + c 9 el x 8^* + 1 c 10 el x * + c 11 el x 2^* + c 12 el x 3^* + c 13 el x 4^* + c 14 el x 5^* + c 15 el x 6^* + c 16 el x 7^* + c 17 el x 8^* + / * :

X J 1 col : Y J 2 col : XY X Y augment : J XY . 12 black plot : 41 line

J1084 mV 8.25 - 638 - range : i 1 mV rows range t i el mV i el J1084 eval : for mV t augment 31 line :

Type 'J' ultimate fit to NBS 125

J J1084 2 1 sys

ΔJ1084 X Y Y X J1084 - (vectorize augment :

ΔJ1084 8.096 - 210.002 - 0 7.796 - 195.802 - 0 7.481 - 182.962 - 0 3.719 - 78.476 - 0 1.906 - 38.862 - 0000 1.374 26.87 0 5.268 1000 6.489 122.37 0 8.374 156.634 0 12.552 231.968 0 14.743 271.442 0.001 17.493 321.108 0 17.846 327.502 0 19.456 356.66 0 22.926 419.58 0 24.312 444.674 0 30.11 548.23 0 34.911 630.74 0 36.693 660.37 0 55.669 961.93 0 61.716 1064.43 0 62.88 1084.5 0233 mat

Calibrate the 'J' mV/I converter

XmV 100 - :

XmV °C ≡

mV 1 :

mV J1084 XmV - 0 ≡ mV 6 - 4 - solve mV 4.6322 -

4.6322 - J1084 100 -

Low range : -100°C => -4.6322mV

XmV 200 :

XmV °C ≡

mV 1 :

mV J1084 XmV - mV 812 solve mV 10.7765

10.7765 J1084 200

High range : 200°C => 10.7765mV

Calibrate 'T, J' Thermocouples

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1. Plunge the the T/C in triple point 0.01 °C bath , c/w the extension wiring.

2. Shift the reading to read 0.01 °C.

3. These two types have the best mV/°C properties, but of not repeatable

fabrication. Thus, a measuring loop must be calibrated in-situ.

These two types don't suffer much from ON/OFF operation [shut down].

However, it is recommended to re-calibrate at each plant shut down.

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