Conversion Charts for Temperature, Thermometer Stem Correction

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  Petroleum Measurement & Testing Equipment
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Miscellaneous Conversion Charts

TEMPERATURE CONVERSION

FROM	TO	FORMULA
Fahrenheit	Celsius	(F - 32) / 1.8
Fahrenheit	Kelvin	(F + 459.67) / 1.8
Fahrenheit	Rankine	F + 459.67
Rankine	Kelvin	R / 1.8
Rankine	Celsius	(R - 491.67) / 1.8
Rankine	Fahrenheit	R - 459.67
Celsius	Fahrenheit	(1.8 x C) + 32
Celsius	Rankine	(1.8 x C) + 491.67
Celsius	Kelvin	C + 273.15
Kelvin	Rankine	1.8 x K
Kelvin	Fahrenheit	(1.8 x K) - 459.67
Kelvin	Celsius	K - 273.15

STEM CORRECTIONS (mercury in glass thermometers)

C = Correction (for a total immersion thermometer)

K = Differential expansion coefficient between mercury and glass

N = Number of thermometer scale degrees the mercury is out of the bath

t_i= Temperature of the thermometer bulb

= Average temperature of the portion of the stem containing mercury which is out of the bath

note: K = .00016/C° or K = .00009/ F°

t_a= Actual temperature

TEMPERATURE COMPARISON CHART

THERMOCOUPLES

^Et = ^Er + ^Em

^{Et = EMF value corresponding to the actual temperature at the Hot Junction}

^Er = EMF output of the thermocouple if one junction were at 0 °C and the other junction were at a temperature equal to the one being used as the reference under discussion.

^Em = Measured EMF output of the couple in its configuration of use (that is, reference junction not at 0 °C).

THERMOCOUPLE IDENTIFICATION TABLE

ANSI

Code

Alloy Combination

Color Coding

Magnetic Lead

Temperature Range

EMF

(mv)

Limits of Error

(Whichever is greater)

+ Lead

- Lead

Thermocouple Grade (TG)

Extension Grade (EG)

Standard

Special

(+)

(-)

(+)

(-)

IRON

CONSTANTAN

COPPER-NICKEL

Cu-Ni

BRN

WHT

RED

BLK

WHT

RED

IRON (+)

TG 0 to 750 °C

EG 0 to 200 °C

0 to 42.283

2.2 °C or .75%

1.1 °C

.40%

CHROMEL

NICKEL-CHROMIUM

Ni-Cr

ALUMEL NICKEL-ALUMEL

Ni-Al

BRN

YEL

RED

YEL

RED

ALUMEL (-)

TG -200 to 1250 °C

EG 0 to 200°C

-5.973 to 50.633

2.2 °C or

<0 °C .75%

>0 °C 2.0%

1.1 °C

.40%

COPPER

CONSTANTAN

COPPER-NICKEL

Cu-Ni

BRN

BLU

RED

BLU

RED

TG -200 to 350 °C

EG -60 to 100°C

-5.602 to 17.816

1.0 °C or

<0 °C .75%

>0 °C 1.5%

0.5 °C

.40%

CHROMEL

NICKEL-CHROMIUM

Ni-Cr

CONSTANTAN

COPPER-NICKEL

Cu-Ni

BRN

PUR

RED

PUR

RED

TG -200 to 900 °C

EG 0 to 200 °C

-8.824 to 68.783

1.7°C or

<0 °C 0.5%

>0 °C 1.0%

1.0 °C

.40%

NICROSIL

Ni-Cr-Si

NISIL

Ni-Si-Mg

BRN

ORN

RED

ORN

RED

TG -270 to 1300 °C

EG 0 to 200 °C

-4.345 to 47.502

2.2 °C or

<0 °C .75%

>0 °C 2.0%

1.1 °C

.40%

PLATINUM-

13% RHODIUM

Pt-13% Rh

PLATINUM

GRN

BLK

RED

TG 0 to 1450 °C

EG 0 to 150 °C

0 to 16.741

1.5 °C

.25%

.60 °C

.10%

PLATINUM-

10% RHODIUM

Pt-10% Rh

PLATINUM

GRN

BLK

RED

TG 0 to 1450 °C

EG 0 to 150 °C

0 to 14.973

1.5 °C

.25%

.60 °C

.10%

PLATINUM-

30% RHODIUM

Pt-30% Rh

PLATINUM-

6% RHODIUM

Pt-6% Rh

GRY

RED

TG 0 to 1700 °C

EG 0 to 100 °C

0 to 12.426

<800 °C .50%

none est.

TUNGSTEN

TUNGSTEN-

26% RHENIUM

W-26% Re

WT/

WHT

RED

TG 0 to 2320 °C

EG 0 to 260 °C

0 to 38.564

4.5-425 °C

1.0% - 2320 °C

none est.

TUNGSTEN-

5% RHENIUM

W-5% Re

TUNGSTEN-

26% RHENIUM

W-26% Re

WT/

RED

WHT

RED

TG 0 to 2320 °C

EG 0 to 870 °C

0 to 37.066

4.5-425 °C

1.0% - 2320 °C

none est.

TUNGSTEN-

3% RHENIUM

W-3% Re

TUNGSTEN-

25% RHENIUM

W-25% Re

WT/

YEL

WHT

RED

TG 0 to 2320 °C

EG 0 to 260 °C

0 to 39.506

4.5-425 °C

1.0% - 2320 °C

none est.

* Not Official Symbol or Standard

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