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IS 2053 (1974): Thermocouple pyrometers [ETD 18: IndustrialProcess Measurement and Control]

IS:20!53-1974 (Reaffirmed 1993)

Indian Standard

SPECIFICATION FOR

THERMOCOUPLE PYROMETERS

(First Revision )

Fourth Reprint FEBRUARY 1999

UDC 621.362 : 536.52

0 Copyright 1974

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr 2 August 1974

ls t 205311974

Indian Standard SPECIFICATION FOR

THERMOCOUPLE PYROMETERS

(First Revision )

Electrical Instruments Sectional Committee, ETDC 48

Chairman

PROF ( DR ) J. K. CFXOUDHARY Jadavpur University

Calcutta

Members Representing

SHRI K. R. BANER.TF-E Instrumentation Ltd, Kota SRRI S. K. GOYAL ( Allrrnatc )

SHRI V. K. BATRA National Physical Laboratory ( CSIR ), New Delhi DR A. S. BRADURI National Test House, Calcutta

!hRl B. P. GHoSH ( ~fttftiatt )

Wo CDR I-I. S. BHATIA Directorate of Technical Development & Produc- tion ( Air ), New Delhi

SARI M. K. KULSHRESTHA ( Alternate ) SHRI J. L. CHH+BRA Directorate General of Supplies & Disposals

( Inspection Wing), New Delhi SHR~ J. P. P~aer ( Altematc )

Cot R. C. DEIN~RA Controllerate of Inspection Electronics ( Ministry of Defence ) Bangalore

SERT N. NARAYANA RAO ( Alternate ) SHRI R. N. GANDHI Institute for Design of Electrical Measuring Instru-

ments, Bombay SRRI G. CRANDRASEKABAN ( Altemte )

SHRI A. N. GHOSH Development Commissioner, Small Scale Industries LyhTistry of Industrial Development ), New

SHRI R. K. ARORA ( Alfaaafe ) SHRI K. B. KAHAT Directorate General of Posts C Telegrapha

( Department of Communications ), New Delhi SHRI S. C. MUKRRRJRE ( Ahsat6 )

SRRI S. D. KULKARNI All India Instrument Manufacturers’ & Dealers’ Association, Bombay

SRRI B. K. GARODIA ( ANemale )

BUREAU OF INDIAN STANDARDS

This publiation is protected under the Indian G&right Act (XIV of 1957) and reproduction in whole or in part by any means except with written permtsston of the publisher shall be deemed to be an infringement of copyright under the said Act.

..,_.._“,,_. .-_“l ”

15:2053-1974

( Continued from page 1 )

Members Representing

SHRI J. R. M~RAJAN Indian Electrical Manufacturers’ Association,

SHRI S. P. RANADE ( Altcrnalr ) Bombay

SHRI S. S. MAVI Department of Industries, Government of Punjab,

SHRI K. L. KOHLI ( Allcrnate ) Chandigarh

SHRI K. P. R. NAMBIAR British Physical Laboratories India Pvt Ltd,

SHRI K. GOPAL ( Alfemale ) Bangalore

SHRI E. N. NARAYANASWAMY Department of Industries and Commerce, Government of Tam&ado, Madras

SHRI P. V. N. RAMANATHAN Central Scientific Instruments Organization ( CSIR ),

DR R. N. MATHUR ( Alternate ) Chandigarh

SERI K. N. RAMASWAZIY Directorate General of Technical Development, New Delhi

SHRI M. K. BANERJEE ( Al&ate ) SUPERINTENDENT ( ELECTRICAL ) Research, Designs & Standards Organization

( Ministry of Railways ), Lucknow DR G. R. TOSHNIWAL Toshniwal Industries Pvt Ltd, Ajmer

SHRI S. C. MAIIESIIWARI ( Alternate ) SHRI S. VEEBA’RAG~AVAN The Bombay Electric Supply and Transport

Undertaking, Bombay SHRI A. D. LIMAYE ( Alfernatc )

SHRI M. S. WANDALKAR Heavy Electricals ( India ) Ltd, Bhopal SHRI S., K. KAYLIWAL ( Alternate )

SHRI N. SRINI~ASAN, Director General, IS1 ( Ex-ogicio Member ) Director ( Elec tech )

S!IRI HAR~HAIZAN SIN~FI Assist.mt Director ( Elec tech ), IS1

2

X8:2053-1974

Indian Standard SPECIFICATION FOR

THERMOCOUPLE PYROMETERS

( First Revision ) 0. FOREWORD

0.1 This Indian Standard ( First Revision) was adopted by the Indian Standards Institution on 20 March 1974, after the draft finalized by the Electrical Instruments Sectional Committee had been approved by the Electrotechnical Division Council. 0.2 This standard was first issued in 1962 and covered requirements of thermocouple pyrometers. In view of the fact that in most cases it is only the thermocouple which is supplied by a manufacturer rather than the complete pyrometer, it was decided to cover requirements of complete pyrometer in this revision, while requirements for thermocouple are covered in a separate standard IS : 7353.1974*.

0.3 The thermocouple pyrometers covered in this standard are suitable for use in normal pressure.

NOTE - The requirements for thermocouple pyrometers for use at high pressure are under consideration.

0.4 The reference tables giving the emf-temperature relationship for different thermocouple materials are given in the following Indian Standards:

IS : 2054-1962 Reference tables for nickel/chromium-nickel/alumi- nium thermocouples

IS : 2055-1962 Reference tables thermocouples

for platinum/rhodium-platinum

IS : 2056-1962 Reference tables for copper-constantan thermocouples IS : 2057-1962 Reference tables for iron-constantan thermocouples IS : 6720-1972 Reference tables for plantinum/30 percent rhodium-

platinum/6 percent rhodium

0.5 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS: 2-1960t. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

*Specification for thermocouples. *Rules for rounding off numerical values ( rcuisrd ).

3

ISt2053-1974

1. SCOPE

1.1 This standard covers the requirements and methods of tests for thermocouple pyrometers where the temperature indication is given by the emf of the thermocouple.

1.2 It does not cover digital, controlling, radiation or optical pyrometers.

2. TERMINOLOGY

2.0 For the purpose of this standard, the following definitions in addition to those given in IS : 1885 (Part XI )-19W and IS : 7358-19741 shall apply.

2.1 Pyrometer - An instrument for measuring temperature usually by electrical means.

2.2 Thermocouple Pyrometer - A pyrometer which uses a thermo- couple as the sensing element to which heat is transmitted directly.

2.3 Compensating Leads - A pair of lead wires of such material that when it is connected to a thermocouple, the effective reference junctions shall be transferred to the other end of the leads.

2.4 Extension Leads - A pair of lead wires of a material, such as copper or aluminium, one end of which is connected to the reference junction and the other to the indicator.

2.5 External Resistance ( or Balancing Resistance) -The value of the resistance taken into account for calibrating the pyrometer for temperature. It comprises the resistance of the thermocouple, compen- sating and extension leads and any extra resistance added to make the total to the value specified on the indicator.

2.6 Type Tests -Tests carried out to prove conformity with the requirements of this specification., These are intended to proye the general qualities and design of a given type of thermocouple pyrometer.

2.7 Routine Tests -Tests carried out on each thermocouple pyrometer to check requirements likely to vary during production.

3. COMPONENT PARTS

3.1 The thermocouple pyrometer shall consist of the following parts:

a) thermocouple ( SM 3.2 ); b) measuring device (see 3.3); c) compensating leads, if required (see 3.4); d) extension leads, if required; e) balancing resistance, if required; and f) reference junction compensating device, if required.

l Electrotechnical vocabulary: Part XI Electrical measurements. tSp&tication for thermocouples.

4

IS t 2053 - 1914

3.2 Thermocouple - The thermocouple shall conform to IS : 7358- 1974*.

3.3 Measuring Device

3.3.1 Measuring device may be: a) indicating instrument, or b) recording instrument, or c) any other suitable measuring device.

3.3.1.1 Indicah’ng instrument-The indicating instrument used shall conform to IS : 1248-1968t.

3.3.1.2 Recording instrument-The recording instrument used shall conform to IS:6236-1971:.

3.3.1.3 Other measuring devices-Other measuring devices used shall conform to the relevant Indian Standards, wherever available.

3.3.2 Indicator Dial

3.3.2.1 The indicator dial shall be graduated to read the thermo- couple measuring junction temperature in degree Celcius.

3.3.3 Compensation for Temperature Errors - The indicator may incorporate the compensation for errors due to variation of ambient temperature.

3.4 Compensating Leads -The compensating leads shall conform to ‘ Indian Staridard Specification for compensating leads’ (under preparation ) .

4. ACCWRACY

4.1 In judging the accuracy of an indicator, the emf-temperature relationship of the materials used in thermocouples as stated by the rhermocouple wire’manufacturer as well as the given external resistance in the circuit should be taken into account.

4.2 The accuracy of the thermocouple shall be in accordance with IS.7358-1974*. .

5. MARKING

5.1 The following particulars, in addition to those given in IS : 1248-1968t or IS ;6236-1971$, as applicable, shall be prominently marked on the dial of the pyrometer:

a) Manufacturer’s name or trade-mark, if any; b) Type of thermocouple for which the indicator is calibrated ( for

example, Cu-Con );

*Specification for thermocouples. @pecification for direct acting electrical indicating instruments (first rcvisivn ). $Specification for direct recording electrical measuring instruments.

5

IS : 2053 - 1974

c) Internal resistance;

d) External resistance; and

e) mV corresponding to upper limit of effective range.

5.1.1 The product may also be marked with Standard mark.

5..2 The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which the licence for the use of Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards.

6. TESTS

6.1 The thermocouple and the indicator or recorder shall conform to all the type and routine tests specified in IS : 735%1974* and IS : 1248-19687 or IS: 62361971: respectively.

*Specification for thermocouples. tspecification for direct acting electrical indicating instruments (Jirzr rrtision ) . ispecification for direct recording electrical measuring instruments.

6

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