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Platinum, copper, and nickel resistance thermometers(for industrial and commercial use)

Thermomtres rsistance de platine, de cuivre, et de nickel( usages techniques et commerciaux)

O I M L R 8 4 E d i t i o n

2 0 0 3 ( E )

OIML R 84Edition 2003 (E)

ORGANISATION INTERNATIONALEDE MTROLOGIE L GALE

INTERNATIONAL ORGANIZATIONOF L EGAL METROLOGY

INTERNATIONAL RECOMMENDATION

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T he International Organization of Legal Metrology(OIML) is a worldwide, intergovernmental organizationwhose primary aim is to harmonize the regulations andmetrological controls applied by the national metrologicalservices, or related organizations, of its Member States.

The two main categories of OIML publications are:

International Recommendations (OIML R) , which aremodel regulations that establish the metrological charac-teristics required of certain measuring instruments andwhich specify methods and equipment for checking theirconformity; the OIML Member States shall implementthese Recommendations to the greatest possible extent;

International Documents (OIML D) , which are inform-ative in nature and intended to improve the work of themetrology services.

OIML Draft Recommendations and Documents are devel-oped by technical committees or subcommittees which areformed by Member States. Certain international and regionalinstitutions also participate on a consultation basis.

Cooperative agreements are established between OIML andcertain institutions, such as ISO and IEC, with the objective

of avoiding contradictory requirements; consequently, manu-facturers and users of measuring instruments, test labor-atories, etc. may apply simultaneously OIML publicationsand those of other institutions.

International Recommendations and International Docu-ments are published in French (F) and English (E) and aresubject to periodic revision.

This publication - reference OIML R 84 Edition 2003 (E) -was developed by the OIML Technical SubcommitteeTC 11/SC 1 Resistance thermometers . It was approved for finalpublication by the International Committee of LegalMetrology in 2002 and will be submitted to the International

Conference of Legal Metrology in 2004 for formal sanction.OIML publications may be obtained from the Organizationsheadquarters:

Bureau International de Mtrologie Lgale11, rue Turgot - 75009 Paris - FranceTelephone: 33 (0)1 48 78 12 82Fax: 33 (0)1 42 82 17 27E-mail: biml@oiml.orgInternet: www.oiml.org

Foreword

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4 Metrological requirements

4.1 The preferred nominal values of resistance are:1, 10, 25, 50, 100, 120, 200, 500, 1 000 and 10 000 .The nominal value of the resistance R0 of the resistancethermometer at 0 C shall be not less than 1 .For resistance thermometers of type CRT the nominalresistance at 0 C shall be not less than 9 .

4.2 The maximum permissible deviations (tolerances)of the temperature calculated from the resistance Rt of the thermometers using the tables of relative resist-ances (Annex A), from the true measured temperaturet shall be not more than the values given in Table 2.

Note: Tolerances in the range 650 C to 850 C shall beestablished by manufacturers in the technicalspecifications.

4.3 After being held for 250 hours at the maximumoperating temperature, and then for 250 hours at theminimum operating temperature, the resistance R0 of the thermometer shall not change by more than thetolerances specified in Table 2 for t = 0 C.

5 Technical specifications

5.1 The resistance thermometer shall be protectedfrom corrosion, the ingress of moisture, and mech-anical and thermal stresses.

5.2 The electrical insulation resistance between thesensing element and the protective sheath, andbetween the electrical circuits of thermometers withmore than one sensing element, shall be not less thanthe following:

a) at temperatures between 15 C and 35 C (withrelative humidity of ambient air between 45 % and85 %): 100 M,

b) at maximum operating temperature the electricalinsulation resistance shall be not less than the

values given in Table 3.

Table 3 Minimum values of electrical insulation resistance

5.3 The resistance thermometer may have two, threeor four leads, according to the circuitry intended forthe measurement of resistance.

5.4 Resistance thermometers to be used underparticular conditions must meet the requirements forstability as well as for technical and metrological

Type of Tolerance Temperature range of Tolerancethermometer class validity of tolerances, value

C C

PRT AA 50 ... + 250 (0.1 C + 1.7 10-3 t )A 100 ... + 450 (0.15 C + 2.0 10-3 t )B 196 ... + 650 (0.30 C + 5.0 10-3 t )C 196 ... + 650 (0.6 C + 1.0 10-2 t )D 196 ... + 650 (1.2 C + 1.2 10-2 t )

CRT B 180 ... + 200 (0.25 C + 3.5 10-3 t )C 180 ... + 200 (0.5 C + 6.5 10-3 t )

NRT C 0 ... + 180 (0.2 C + 8.0 10-3 t )C 60 ... 0 (0.2 C + 16.5 10-3 t )

Maximum Minimumoperating value of the insulation

temperature, C resistance, M

from 100 to 250 20

from 251 to 450 2

from 451 to 650 0.5

from 651 to 850 0.2

Table 2 Tolerances

Note: t is the temperature in C without a sign

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characteristics prescribed by the national standards ortechnical specifications for those types of resistancethermometers.

6 Markings

6.1 Each resistance thermometer shall bear thefollowing markings on the protective sheath or on alabel attached to it:

type designation,serial number,nominal value of R0,range of operating temperatures,

nominal value of W I100,tolerance class,

manufacturers trade mark,month and year of manufacture.

Note: If this information is presented in the form of symbols, they shall be presented in the aboveorder.

6.2 A resistance thermometer may also bear othermarkings.

6.3 The official verification mark shall be placed onthe protective sheath of the resistance thermometer oron a label attached to it.

7 Metrological controls

When, in any country, resistance thermometers aresubject to state metrological controls, the latter shallinclude the controls in 7.1 through 7.4.

7.1 The type of the resistance thermometer shall meetthe requirements of the present Recommendation (typeapproval). A special authorization shall be given tomodify the type approved based on type evaluation.The list of examinations and tests of type evaluation isgiven in Table 4.

7.2 New resistance thermometers shall be subject toinitial verification. The list of examinations and testsfor initial verification is given in Table 4.

7.3 Resistance thermometers in use shall be subject tosubsequent verification to ensure that their metrological

Type of examinations Clause of the Examination &Mandatory

and tests Recommendation test procedure

execution

For type For initial For subsequent evaluation verification verification

External examination 5.1, 5.3, 9.1 + + +(inspection) 6.1, 6.2, 6.3

Measurement of the 5.2 9.2 + + -electrical insulation resistance

Checking of stability 4.3 9.3 + - -

Measurement of the 4.1, 4.2 9.3 + + +thermometer resistance at 0 C

Measurement of thethermometer resistance at atemperature t in the range 80 Cto 250 C, at the lower limit ofthe operating range(if below 0 C), and at theupper limit of the operatingrange (if above 450 C) 4.2 9.4 + + -

Table 4 List of tests for metrological controls of resistance thermometers

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characteristics are maintained. The list of examina-tions and tests for subsequent verification is given inTable 4.

7.4 Resistance thermometers to be used underparticular conditions shall be subject to additionaltypes of tests according to the technical specificationsof a resistance thermometer.

8 Conditions of testing and applicableequipment

8.1 The conditions of testing shall be the following:

ambient temperature: 25 C 10 C,relative humidity: from 30 % to 80 %,atmospheric pressure: from 84 kPa to 106.7 kPa.

8.2 The resistance of the thermometer under test in athermally controlled bath, shall be measured under thefollowing conditions:

the depth of immersion shall be such as to ensurenegligible heat loss during verification, related tothe maximum permissible tolerances in 4.2;the value of the measurement current in the resist-ance thermometer shall be such that the powerdissipation does not cause a rise in temperaturewhich exceeds 20 % of the tolerance value of thedeclared tolerance class (4.2).

8.3 The thermometer resistance at 0 C is measuredusing a bath filled with finely crushed pure ice (orsnow) made from distilled water and flooded withdistilled water (10 to 20 mm below the level of ice). Thewater used to prepare the ice and the water added to

the ice must be pure. The mixture of ice and watermust be well packed in order to eliminate air bubbles.The mixture must be packed before measurement and,from time to time, between measurements. Theresistance thermometer must be surrounded by a layerof the mixture, the thickness of which is not less than30 mm.

An alternative method would be to use a thermallycontrolled bath as described in 8.4 except for thetemperature which shall be 0 C. The calibrationuncertainty at 0 C must not exceed 0.04 C.

8.4 The thermometer resistance at a temperature t inthe range 80 C to 250 C, at the lower limit of the

operating range (if below 0 C), and at the upper limitof the operating range (if above 450 C) is measuredusing a thermally controlled bath and a referenceresistance thermometer. The expanded calibrationuncertainty must not exceed either 0.04 C or 10 % of the tolerance value, whichever is larger.

9 Procedures for metrological controls

9.1 External examination (inspection)

The protective sheath shall be examined externally tocheck that it shows no trace of deterioration visible tothe naked eye. This inspection also verifies that the

resistance thermometer complies with administrativerequirements (marking, verification mark, etc.).

9.2 Measurement of the electricalinsulation resistance

To measure insulation resistance, the terminals of theresistance thermometer shall be shorted to each otherand connected to one of the terminals of a megohm-meter, having the operating DC voltage range from 10 V

to 100 V. The conductor of the second terminal of themegohmmeter shall be clamped to the protectivesheath of the resistance thermometer.

The insulation resistance at the maximum operatingtemperature of the thermometer shall be measured at aDC voltage not exceeding 10 V, the thermometer havingbeen held at the maximum operating temperature for2 hours.

Note: If the sheath of the resistance thermometer ismade of insulating material, resistance of theelectrical insulation between the sheath and thesensing element does not need to be checked.

9.3 Checking the stability of a resistancethermometer

To check the stability of a resistance thermometer, itsresistance shall be measured at the temperature 0 C(meeting the conditions of 8.2 and 8.3), then thethermometer is held for 250 hours at the maximumoperating temperature and then for the other 250 hoursat the minimum operating temperature. After that the

measurement of resistance at 0 C shall be repeated.The resistance R0 of the thermometer shall satisfy therequirements for stability specified in 4.3.

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9.4 Measurement of the resistance of a thermo-meter at a temperature t in the range 80 Cto 250 C, at the lower limit of the operatingrange (if below 0 C) and at the upper limitof the operating range (if above 450 C)

The thermometer resistance at a temperature t ismeasured in a thermally controlled bath by com-parison with a reference resistance thermometer(conditions in 8.2 and 8.4 shall be met). If thetemperature t is above 500 C, the thermometer shouldnot be removed quickly from the bath to ambient air,but should be cooled slowly with the rate less than1 C/min to 500 C, and then removed from thethermally controlled bath.

To verify the conformity to the requirements of 4.2, the value of W It = Rt /R0 , where Rt and R0 are the thermo-meter resistance values at temperatures t and 0 C,shall be calculated. Then the calculated value of thetemperature t shall be determined using Tables A.1A.5in Annex A. The calculated value and that measured bya reference thermometer shall not differ from eachother by more than the tolerances specified in Table 2.

To determine the relative resistance W I100, theresistance R100 can be calculated by interpolation usingthe extrapolation equations or the tables given inAnnex A.

9.5 A test report is presented on the basis of the testresults. Its format is given in Annex B.

9.6 A verification certificate is issued or a verificationmark is put on a resistance thermometer by ametrological organization on the basis of the

verification results.

References

[1] H. Preston-Thomas, The International Temp-erature Scale of 1990 (ITS-90), Metrologia, Vol.27, pp. 310, (1990); ibid. p. 107.

[2] IEC 60751 (1983.01), -am1 (1986.01), -am2(1995.07): Industrial Platinum ResistanceThermometer Sensors. International Electro-technical Commission, Geneva

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A n n e x

A

T a b l e s o f r e l a t

i v e r e s i s t a n c e s

( M a n

d a t o r y )

T a b l e A

. 1

R t /

R 0

R a t

i o s

f o r p

l a t i n u m r e s i s t a n c e

t h e r m o m e t e r s w

i t h R

1 0 0

/ R 0

= 1 . 3 8 5

( C o r r e s p o n d

t o I E C 6 0 7 5 1 [ 2 ] )

I n t e r p o l a t

i o n e q u a t

i o n

f o r

t h e

t e m p e r a t u r e r a n g e

f r o m

2 0 0 C t o 0 C :

R t /

R 0 =

1 +

A t +

B t 2 +

C ( t

1 0 0 ) t 3

f r o m

0 C t o 8 5 0 C :

R t /

R 0 =

1 +

A t +

B t 2

w h e r e

A =

3 . 9 0 8 3

1 0 - 3 C - 1

B =

5 . 7 7 5 0

1 0 - 7 C - 2

C =

4 . 1 8 3 0

1 0 - 1

2 C - 4

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

1 0 0

0 . 6 0 2 6

0 . 5 8 2 3

0 . 5 6 1 9

0 . 5 4 1 5

0 . 5 2 1 1

0 . 5 0 0 6

0 . 4 8 0 0

0 . 4 5 9 4

0 . 4 3 8 8

0 . 4 1 8 0

0 . 3 9 7 2

0 . 3 7 6 4

0 . 3 5 5 4

0 . 3 3 4 4

0 . 3 1 3 4

0 . 2 9 2 2

0 . 2 7 1 0

0 . 2 4 9 7

0 . 2 2 8 3

0 . 2 0 6 8

0 . 1 8 5 2

0

1 . 0 0 0 0

0 . 9 8 0 4

0 . 9 6 0 9

0 . 9 4 1 2

0 . 9 2 1 6

0 . 9 0 1 9

0 . 8 8 2 2

0 . 8 6 2 5

0 . 8 4 2 7

0 . 8 2 2 9

0 . 8 0 3 1

0 . 7 8 3 2

0 . 7 6 3 3

0 . 7 4 3 3

0 . 7 2 3 3

0 . 7 0 3 3

0 . 6 8 3 3

0 . 6 6 3 1

0 . 6 4 3 0

0 . 6 2 2 8

0 . 6 0 2 6

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

0

1 . 0 0 0 0

1 . 0 1 9 5

1 . 0 3 9 0

1 . 0 5 8 5

1 . 0 7 7 9

1 . 0 9 7 3

1 . 1 1 6 7

1 . 1 3 6 1

1 . 1 5 5 4

1 . 1 7 4 7

1 . 1 9 4 0

1 . 2 1 3 2

1 . 2 3 2 4

1 . 2 5 1 6

1 . 2 7 0 8

1 . 2 8 9 9

1 . 3 0 9 0

1 . 3 2 8 0

1 . 3 4 7 1

1 . 3 6 6 1

1 . 3 8 5 1

1 0 0

1 . 3 8 5 1

1 . 4 0 4 0

1 . 4 2 2 9

1 . 4 4 1 8

1 . 4 6 0 7

1 . 4 7 9 5

1 . 4 9 8 3

1 . 5 1 7 1

1 . 5 3 5 8

1 . 5 5 4 6

1 . 5 7 3 3

1 . 5 9 1 9

1 . 6 1 0 5

1 . 6 2 9 1

1 . 6 4 7 7

1 . 6 6 6 3

1 . 6 8 4 8

1 . 7 0 3 3

1 . 7 2 1 7

1 . 7 4 0 2

1 . 7 5 8 6

2 0 0

1 . 7 5 8 6

1 . 7 7 6 9

1 . 7 9 5 3

1 . 8 1 3 6

1 . 8 3 1 9

1 . 8 5 0 1

1 . 8 6 8 4

1 . 8 8 6 6

1 . 9 0 4 7

1 . 9 2 2 9

1 . 9 4 1 0

1 . 9 5 9 1

1 . 9 7 7 1

1 . 9 9 5 1

2 . 0 1 3 1

2 . 0 3 1 1

2 . 0 4 9 0

2 . 0 6 7 0

2 . 0 8 4 8

2 . 1 0 2 7

2 . 1 2 0 5

3 0 0

2 . 1 2 0 5

2 . 1 3 8 3

2 . 1 5 6 1

2 . 1 7 3 8

2 . 1 9 1 5

2 . 2 0 9 2

2 . 2 2 6 8

2 . 2 4 4 5

2 . 2 6 2 1

2 . 2 7 9 6

2 . 2 9 7 2

2 . 3 1 4 7

2 . 3 3 2 1

2 . 3 4 9 6

2 . 3 6 7 0

2 . 3 8 4 4

2 . 4 0 1 8

2 . 4 1 9 1

2 . 4 3 6 4

2 . 4 5 3 7

2 . 4 7 0 9

4 0 0

2 . 4 7 0 9

2 . 4 8 8 1

2 . 5 0 5 3

2 . 5 2 2 5

2 . 5 3 9 6

2 . 5 5 6 7

2 . 5 7 3 8

2 . 5 9 0 8

2 . 6 0 7 8

2 . 6 2 4 8

2 . 6 4 1 8

2 . 6 5 8 7

2 . 6 7 5 6

2 . 6 9 2 5

2 . 7 0 9 3

2 . 7 2 6 1

2 . 7 4 2 9

2 . 7 5 9 7

2 . 7 7 6 4

2 . 7 9 3 1

2 . 8 0 9 8

5 0 0

2 . 8 0 9 8

2 . 8 2 6 4

2 . 8 4 3 0

2 . 8 5 9 6

2 . 8 7 6 2

2 . 8 9 2 7

2 . 9 0 9 2

2 . 9 2 5 6

2 . 9 4 2 1

2 . 9 5 8 5

2 . 9 7 4 9

2 . 9 9 1 2

3 . 0 0 7 5

3 . 0 2 3 8

3 . 0 4 0 1

3 . 0 5 6 3

3 . 0 7 2 5

3 . 0 8 8 7

3 . 1 0 4 9

3 . 1 2 1 0

3 . 1 3 7 1

6 0 0

3 . 1 3 7 1

3 . 1 5 3 1

3 . 1 6 9 2

3 . 1 8 5 2

3 . 2 0 1 2

3 . 2 1 7 1

3 . 2 3 3 0

3 . 2 4 8 9

3 . 2 6 4 8

3 . 2 8 0 6

3 . 2 9 6 4

3 . 3 1 2 2

3 . 3 2 7 9

3 . 3 4 3 6

3 . 3 5 9 3

3 . 3 7 5 0

3 . 3 9 0 6

3 . 4 0 6 2

3 . 4 2 1 8

3 . 4 3 7 3

3 . 4 5 2 8

7 0 0

3 . 4 5 2 8

3 . 4 6 8 3

3 . 4 8 3 8

3 . 4 9 9 2

3 . 5 1 4 6

3 . 5 3 0 0

3 . 5 4 5 3

3 . 5 6 0 6

3 . 5 7 5 9

3 . 5 9 1 2

3 . 6 0 6 4

3 . 6 2 1 6

3 . 6 3 6 7

3 . 6 5 1 9

3 . 6 6 7 0

3 . 6 8 2 1

3 . 6 9 7 1

3 . 7 1 2 1

3 . 7 2 7 1

3 . 7 4 2 1

3 . 7 5 7 0

8 0 0

3 . 7 5 7 0

3 . 7 7 1 9

3 . 7 8 6 8

3 . 8 0 1 7

3 . 8 1 6 5

3 . 8 3 1 3

3 . 8 4 6 0

3 . 8 6 0 8

3 . 8 7 5 5

3 . 8 9 0 2

3 . 9 0 4 8

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T a b l e A

. 2

R t /

R 0

R a t

i o s

f o r p

l a t i n u m r e s i s t a n c e

t h e r m o m e t e r s w

i t h R

1 0 0

/ R 0

= 1 . 3 9 1

I n t e r p o l a t

i o n e q u a t

i o n

f o r t h e

t e m p e r a t u r e r a n g e

f r o m

2 0 0 C t o 0 C :

R t / R 0

= 1 +

A t +

B t 2

+ C ( t

1 0 0 ) t 3

f r o m

0 C

t o 8 5 0 C :

R t / R 0

= 1 +

A t +

B t 2

w h e r e

A =

3 . 9 6 9 0

1 0 - 3 C - 1

B =

5 . 8 4 1 0

1 0 - 7 C - 2

C =

4 . 1 8 3 0

1 0 - 1

2 C - 4

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

1 0 0

0 . 5 9 6 4

0 . 5 7 5 8

0 . 5 5 5 2

0 . 5 3 4 5

0 . 5 1 3 7

0 . 4 9 2 9

0 . 4 7 2 0

0 . 4 5 1 1

0 . 4 3 0 1

0 . 4 0 9 1

0 . 3 8 8 0

0 . 3 6 6 8

0 . 3 4 5 6

0 . 3 2 4 2 0

. 3 0 2 8

0 . 2 8 1 4

0 . 2 5 9 8

0 . 2 3 8 2

0 . 2 1 6 5

0 . 1 9 4 7

0 . 1 7 2 8

0

1 . 0 0 0 0

0 . 9 8 0 1

0 . 9 6 0 3

0 . 9 4 0 3

0 . 9 2 0 4

0 . 9 0 0 4

0 . 8 8 0 4

0 . 8 6 0 3

0 . 8 4 0 3

0 . 8 2 0 2

0 . 8 0 0 0

0 . 7 7 9 8

0 . 7 5 9 6

0 . 7 3 9 4 0

. 7 1 9 1

0 . 6 9 8 7

0 . 6 7 8 4

0 . 6 5 7 9

0 . 6 3 7 5

0 . 6 1 7 0

0 . 5 9 6 4

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

0

1 . 0 0 0 0

1 . 0 1 9 8

1 . 0 3 9 6

1 . 0 5 9 4

1 . 0 7 9 1

1 . 0 9 8 9

1 . 1 1 8 5

1 . 1 3 8 2

1 . 1 5 7 8

1 . 1 7 7 4

1 . 1 9 7 0

1 . 2 1 6 5

1 . 2 3 6 0

1 . 2 5 5 5 1

. 2 7 5 0

1 . 2 9 4 4

1 . 3 1 3 8

1 . 3 3 3 1

1 . 3 5 2 5

1 . 3 7 1 8

1 . 3 9 1 1

1 0 0

1 . 3 9 1 1

1 . 4 1 0 3

1 . 4 2 9 5

1 . 4 4 8 7

1 . 4 6 7 9

1 . 4 8 7 0

1 . 5 0 6 1

1 . 5 2 5 2

1 . 5 4 4 2

1 . 5 6 3 2

1 . 5 8 2 2

1 . 6 0 1 2

1 . 6 2 0 1

1 . 6 3 9 0 1

. 6 5 7 8

1 . 6 7 6 7

1 . 6 9 5 5

1 . 7 1 4 3

1 . 7 3 3 0

1 . 7 5 1 7

1 . 7 7 0 4

2 0 0

1 . 7 7 0 4

1 . 7 8 9 1

1 . 8 0 7 7

1 . 8 2 6 3

1 . 8 4 4 9

1 . 8 6 3 5

1 . 8 8 2 0

1 . 9 0 0 5

1 . 9 1 8 9

1 . 9 3 7 3

1 . 9 5 5 7

1 . 9 7 4 1

1 . 9 9 2 5

2 . 0 1 0 8 2

. 0 2 9 0

2 . 0 4 7 3

2 . 0 6 5 5

2 . 0 8 3 7

2 . 1 0 1 9

2 . 1 2 0 0

2 . 1 3 8 1

3 0 0

2 . 1 3 8 1

2 . 1 5 6 2

2 . 1 7 4 3

2 . 1 9 2 3

2 . 2 1 0 3

2 . 2 2 8 2

2 . 2 4 6 2

2 . 2 6 4 1

2 . 2 8 1 9

2 . 2 9 9 8

2 . 3 1 7 6

2 . 3 3 5 4

2 . 3 5 3 1

2 . 3 7 0 9 2

. 3 8 8 6

2 . 4 0 6 2

2 . 4 2 3 9

2 . 4 4 1 5

2 . 4 5 9 1

2 . 4 7 6 6

2 . 4 9 4 1

4 0 0

2 . 4 9 4 1

2 . 5 1 1 6

2 . 5 2 9 1

2 . 5 4 6 5

2 . 5 6 3 9

2 . 5 8 1 3

2 . 5 9 8 7

2 . 6 1 6 0

2 . 6 3 3 3

2 . 6 5 0 5

2 . 6 6 7 8

2 . 6 8 5 0

2 . 7 0 2 1

2 . 7 1 9 3 2

. 7 3 6 4

2 . 7 5 3 5

2 . 7 7 0 5

2 . 7 8 7 6

2 . 8 0 4 6

2 . 8 2 1 5

2 . 8 3 8 5

5 0 0

2 . 8 3 8 5

2 . 8 5 5 4

2 . 8 7 2 3

2 . 8 8 9 1

2 . 9 0 5 9

2 . 9 2 2 7

2 . 9 3 9 5

2 . 9 5 6 2

2 . 9 7 2 9

2 . 9 8 9 6

3 . 0 0 6 3

3 . 0 2 2 9

3 . 0 3 9 5

3 . 0 5 6 0 3

. 0 7 2 6

3 . 0 8 9 1

3 . 1 0 5 5

3 . 1 2 2 0

3 . 1 3 8 4

3 . 1 5 4 8

3 . 1 7 1 1

6 0 0

3 . 1 7 1 1

3 . 1 8 7 4

3 . 2 0 3 7

3 . 2 2 0 0

3 . 2 3 6 3

3 . 2 5 2 5

3 . 2 6 8 6

3 . 2 8 4 8

3 . 3 0 0 9

3 . 3 1 7 0

3 . 3 3 3 1

3 . 3 4 9 1

3 . 3 6 5 1

3 . 3 8 1 1 3

. 3 9 7 0

3 . 4 1 2 9

3 . 4 2 8 8

3 . 4 4 4 7

3 . 4 6 0 5

3 . 4 7 6 3

3 . 4 9 2 1

7 0 0

3 . 4 9 2 1

3 . 5 0 7 8

3 . 5 2 3 5

3 . 5 3 9 2

3 . 5 5 4 9

3 . 5 7 0 5

3 . 5 8 6 1

3 . 6 0 1 7

3 . 6 1 7 2

3 . 6 3 2 7

3 . 6 4 8 2

3 . 6 6 3 6

3 . 6 7 9 1

3 . 6 9 4 5 3

. 7 0 9 8

3 . 7 2 5 1

3 . 7 4 0 5

3 . 7 5 5 7

3 . 7 7 1 0

3 . 7 8 6 2

3 . 8 0 1 4

8 0 0

3 . 8 0 1 4

3 . 8 1 6 5

3 . 8 3 1 7

3 . 8 4 6 8

3 . 8 6 1 8

3 . 8 7 6 9

3 . 8 9 1 9

3 . 9 0 6 9

3 . 9 2 1 8

3 . 9 3 6 7

3 . 9 5 1 6

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T a b l e A

. 3

R t /

R 0

R a t

i o s

f o r c o p p e r r e s

i s t a n c e

t h e r m o m e t e r s w

i t h R 1

0 0 / R

0 =

1 . 4 2 6

I n t e r p o l a t

i o n e q u a t

i o n

f o r t h e

t e m p e r a t u r e r a n g e

f r o m

5 0 C t o 2 0 0 C : R t / R 0

= 1 +

A t

w h e r e

A =

4 . 2 6

1 0 - 3 C - 1

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

0

1 . 0 0 0 0

0 . 9 7 8 7

0 . 9 5 7 4

0 . 9 3 6 1

0 . 9 1 4 8

0 . 8 9 3 5

0 . 8 7 2 2

0 . 8 5 0 9

0 . 8 2 9 6

0 . 8 0 8 3

0 . 7 8 7 0

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

0

1 . 0 0 0 0

1 . 0 2 1 3

1 . 0 4 2 6

1 . 0 6 3 9

1 . 0 8 5 2

1 . 1 0 6 5

1 . 1 2 7 8

1 . 1 4 9 1

1 . 1 7 0 4

1 . 1 9 1 7

1 . 2 1 3 0

1 . 2 3 4 3

1 . 2 5 5 6

1 . 2 7 6 9

1 . 2 9 8 2

1 . 3 1 9 5

1 . 3 4 0 8

1 . 3 6 2 1

1 . 3 8 3 4

1 . 4 0 4 7

1 . 4 2 6 0

1 0 0

1 . 4 2 6 0

1 . 4 4 7 3

1 . 4 6 8 6

1 . 4 8 9 9

1 . 5 1 1 2

1 . 5 3 2 5

1 . 5 5 3 8

1 . 5 7 5 1

1 . 5 9 6 4

1 . 6 1 7 7

1 . 6 3 9 0

1 . 6 6 0 3

1 . 6 8 1 6

1 . 7 0 2 9

1 . 7 2 4 2

1 . 7 4 5 5

1 . 7 6 6 8

1 . 7 8 8 1

1 . 8 0 9 4

1 . 8 3 0 7

1 . 8 5 2 0

T a b l e A

. 4

R t /

R 0

R a t

i o s

f o r c o p p e r r e s

i s t a n c e

t h e r m o m e t e r s w

i t h R 1

0 0 / R

0 =

1 . 4 2 8

I n t e r p o l a t

i o n e q u a t

i o n

f o r t h e

t e m p e r a t u r e r a n g e

f r o m

1 8 0 C t o 0 C : R t

/ R 0

= 1 +

A t +

B t ( t +

6 . 7 ) +

C t 3

f r o m

0 C t o 2 0 0 C : R t / R 0

= 1 +

A t

w h e r e

A =

4 . 2 8

1 0 - 3 C - 1

B =

6 . 2 0 3 2

1 0 - 7 C - 2

C =

8 . 5 1 5 4

1 0 - 1

0 C - 3

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

1 0 0

0 . 5 6 5 4

0 . 5 4 3 2

0 . 5 2 1 0

0 . 4 9 8 8

0 . 4 7 6 5

0 . 4 5 4 2

0 . 4 3 1 8

0 . 4 0 9 4

0 . 3 8 6 9

0 . 3 6 4 4

0 . 3 4 1 8

0 . 3 1 9 2

0 . 2 9 6 5

0 . 2 7 3 8

0 . 2 5 1 0

0 . 2 2 8 2

0 . 2 0 5 3

0

1 . 0 0 0 0

0 . 9 7 8 6

0 . 9 5 7 2

0 . 9 3 5 7

0 . 9 1 4 2

0 . 8 9 2 7

0 . 8 7 1 1

0 . 8 4 9 5

0 . 8 2 7 9

0 . 8 0 6 3

0 . 7 8 4 6

0 . 7 6 2 8

0 . 7 4 1 0

0 . 7 1 9 2

0 . 6 9 7 4

0 . 6 7 5 5

0 . 6 5 3 5

0 . 6 3 1 5

0 . 6 0 9 5

0 . 5 8 7 5

0 . 5 6 5 4

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

0

1 . 0 0 0 0

1 . 0 2 1 4

1 . 0 4 2 8

1 . 0 6 4 2

1 . 0 8 5 6

1 . 1 0 7 0

1 . 1 2 8 4

1 . 1 4 9 8

1 . 1 7 1 2

1 . 1 9 2 6

1 . 2 1 4 0

1 . 2 3 5 4

1 . 2 5 6 8

1 . 2 7 8 2

1 . 2 9 9 6

1 . 3 2 1 0

1 . 3 4 2 4

1 . 3 6 3 8

1 . 3 8 5 2

1 . 4 0 6 6

1 . 4 2 8 0

1 0 0

1 . 4 2 8 0

1 . 4 4 9 4

1 . 4 7 0 8

1 . 4 9 2 2

1 . 5 1 3 6

1 . 5 3 5 0

1 . 5 5 6 4

1 . 5 7 7 8

1 . 5 9 9 2

1 . 6 2 0 6

1 . 6 4 2 0

1 . 6 6 3 4

1 . 6 8 4 8

1 . 7 0 6 2

1 . 7 2 7 6

1 . 7 4 9 0

1 . 7 7 0 4

1 . 7 9 1 8

1 . 8 1 3 2

1 . 8 3 4 6

1 . 8 5 6 0

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OIML R 84: 2003 (E)

12

T a b l e A

. 5

R t /

R 0

R a t

i o s

f o r n

i c k e l r e s

i s t a n c e

t h e r m o m e t e r s w

i t h R 1

0 0 / R

0 =

1 . 6 1 7

I n t e r p o l a t

i o n e q u a t

i o n

f o r t h e

t e m p e r a t u r e r a n g e

f r o m

6 0 C t o 1 0 0 C : R t

/ R 0

= 1 +

A t +

B t 2

f r o m

1 0 0

C t o 1 8 0 C : R t

/ R 0

= 1 +

A t +

B t 2

+ C ( t

1 0 0 ) t 3

w h e r e

A =

5 . 4 9 6 3

1 0 - 3 C - 1

B =

6 . 7 5 5 6

1 0 - 6 C - 2

C =

9 . 2 0 0 4

1 0 - 9 C - 3

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

0

1 . 0 0 0 0

0 . 9 7 2 7

0 . 9 4 5 7

0 . 9 1 9 1

0 . 8 9 2 8

0 . 8 6 6 8

0 . 8 4 1 2

0 . 8 1 5 9

0 . 7 9 1 0

0 . 7 6 6 3

0 . 7 4 2 1

0 . 7 1 8 1

0 . 6 9 4 5

R t / R 0

C

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

4 5

5 0

5 5

6 0

6 5

7 0

7 5

8 0

8 5

9 0

9 5

1 0 0

0

1 . 0 0 0 0

1 . 0 2 7 7

1 . 0 5 5 6

1 . 0 8 4 0

1 . 1 1 2 6

1 . 1 4 1 6

1 . 1 7 1 0

1 . 2 0 0 6

1 . 2 3 0 7

1 . 2 6 1 0

1 . 2 9 1 7

1 . 3 2 2 7

1 . 3 5 4 1

1 . 3 8 5 8

1 . 4 1 7 8

1 . 4 5 0 2

1 . 4 8 2 9

1 . 5 1 6 0

1 . 5 4 9 4

1 . 5 8 3 1

1 . 6 1 7 2

1 0 0

1 . 6 1 7 2

1 . 6 5 2 1

1 . 6 8 7 4

1 . 7 2 3 2

1 . 7 5 9 5

1 . 7 9 6 2

1 . 8 3 3 4

1 . 8 7 1 0

1 . 9 0 9 1

1 . 9 4 7 7

1 . 9 8 6 8

2 . 0 2 6 4

2 . 0 6 6 5

2 . 1 0 7 1

2 . 1 4 8 2

2 . 1 8 9 9

2 . 2 3 2 1

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OIML R 84: 2003 (E) Page 2 of 3

14

Type of examinations Test procedure Reference Actual Pass /and tests (clause of value value fail

OIML R 84)

1 External examination (inspection) 9.1

2 Electrical insulation resistance 9.2between the sensing element andthe protective sheath

3* Electrical insulation resistance 9.2between the sensing elementsof the sensors having twosensing elements

4 Thermometer stability 9.3

5 Thermometer resistance 9.3at the temperature 0 C ( R0)

6 Thermometer resistance at a 9.4temperature t in the range80 C to 250 C

7 Thermometer resistance at the 9.4lower limit of the operatingrange (if below 0 C)

8 Thermometer resistance at the 9.4upper limit of the operatingrange (if above 450 C)

9 Calculated value of the relative 9.4resistance at the temperature100 C (W I100)

10* Resistance of the connecting Specified by thewires in two-wire thermometers manufacturer

11* Thermal response time Specified by themanufacturer

12* Resistance to vibration, Specified by themechanical shock and shaking manufacturer

13* Resistance to variations of Specified by thetemperature and humidity of the manufacturerenvironment

* Note: Tests 3 and 1013 are performed if there are relevant requirements given in the thermometer specifica-tions. Additional tests also can be performed for thermometers operating in particular conditions.

Conclusion: PASS FAIL

Date: ................................................. Evaluator: .................................................

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Page 3 of 3 OIML R 84: 2003 (E)

15

Notes, comments and remarks (if any)in addition to the examination and test results

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