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IS : 6524 - 1972
( Reaffirmed 1991)
Indian Standard
CODE OF PRACTICE FOR
INSTALLATION AND OBSERVATION OF
INSTRUMENTS FOR TEMPERATURE
MEASUREMENTS INSIDE DAMS : RESISTANCE
TYPE THERMOMETERS
(Third Reprint JULY 1998 )
UDC 536.531 : 627.8
0 Copyright 1973
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
Gr 3 February 1973
Indian Standard
CODE OF PRACTICE FOR
INSTALLATION AND OBSERVATION OF
INSTRUMENTS FOR TEMPERATURE
MEASUREMENTS INSIDE DAMS : RESISTANCE
TYPE THER MO-METERS
Instrumentation Sectional Committee, BDC 60
Members Representing
DR B. K. AQARWALA National Physical Laboratory ( CSIR ), New Delhi
SHRI B. S. BWALLA Beas Designs Organization, Nangal Township
DR G. P. MALHOTRA ( Alterna!e )
SHRI N. M. CHAERABORTY Damodar Valley Corporation, Dhanbad
CHIEF ENGINEER ( IRR~ATI~N) -Publi;ay;rks Department, Government of Tamil
SHRI P. KUMARA~WAMY ( A&mate )
SHRI P. P. DWIVEDI Central Scientific Instruments Organization ( CSIR ),
SHRI P. GOSWAMI
Chandigarh
Philips India Limited. Bombav
SRRI K. BASU ( Alternote)
SHRI I. P. KAPILA Central Board of Irrigation and Power, New Delhi
SHRI R. RAJARAMAN ( Alternate )
SHRI B. S. KAPRE
RESEARCH OFFICER ( Altematc )
Maharashtra Engineering Research Institute, Nasik
SHRI 2. M. KARACEIWALA Vasi Shums & Co Pvt Ltd, Bombay
) KUMARI A. MANI Meteorological Department, Government of India,
New Delhi
SHRI V. N. NA~ARAJA
SRRI R. G. PATEL
Ministry of Irrigation & Power, New Delhi
SHRIJ. RAMALINQAM
Public Works Department, Government of Gujarat
Central Water & Power Commission, New Delhi
SHRI K. S. RAO
SERI H. C. VERMA
Electronics Corporation of India Limited, Hyderabad
Associated Instruments Manufacturers ( India ) Pvt
Ltd, New Delhi
SERI K. G. PURAN~ ( Alternate )
SHRI D. AJITHA SIMHA,
Director ( Civ Engg )
Director General, IS1 ( Ex-ojkio Member )
Secretary
SHRI G. RAMAN
Deputy Director ( Civ Engg ), IS1
BUREAU OF INDIAN STANDARDS
MANAR BHAVAN, 9 BAHADUR SHAH ZAFAR hfARG
NEW DELHI 110002
IS :6524- 1972
Indian Standard
CODE OF PRACTICE FOR
INSTALLATION AND OBSERVATION OF
INSTRUMENTS FOR TEMPERATURE
MEASUREMENTS INSIDE DAMS : RESISTANCE
TYPE THERMOMETERS
0. FOREWORD
&I This Indian Standard was adopted by the Indian Standards
Institution on 25 February 1972, after the draft finalized by the
Instrumentation Sectional Committee had been approved by the Civil
Engineering Division Council.
0.2 Volume change and stress occur in concrete dams due to temperature
changes also. The temperature changes arise from both external and
internal causes. The temperature effect may be of two general types
in mass concrete, namely:
a) The effect due to the chemical reaction of cement combining with
water, and
b) The effect due to climatic conditions.
0.3 The temperatures of the faces of a dam are affected by radiant heating,
evaporation of water on the face of the dam, reservoir water, etc. The
surface temperature is important because generally cracking begins at
a surface.
0.4 The surface temperature is important to study the effect of ambient
temperature on the surface of the structures and the temperature gradient
through the dam. ‘1he external heating and cooling is as important
as the heating from within caused by the chemical reaction of the cement
combining with water. Most of the internal heating occurs during
the first few weeks after casting, but it continues for many years after the
dam is completed. Thus, in order to determine the effect of temperature
on the stress and volume change in a dam, temperature should be
measured at a number of points within the dam, as well as at the
boundaries. However, it is not necessary to determine the detailed
temperature history of every portion of dam.
2
ISr6524-1972
0.5 This standard contains clauses which require the user to specify
certain technical requirements at the time of placing orders for
thermometers. The relevant clauses are 4.2.1 and 4.2.2.
0.6 In the formulation of this standard due weightage has been given
to international co-ordination among the standards and practices prevail-
ing in different countries in addition to relating it to the practices in
the field in this country.
0.7 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 or analysis, shall be rounded off in accord-
ance with IS : 2-l 960*. The number of significant places retained in
the rounded off value should be the same as that of the specified value
in this standard.
1. SCOPE
1.1 This standard covers the details of installation and observation of
resistance type thermometers of the embedded type for measuring the
temperature in the interior of a concrete dam and such other structures.
2. TEMPERATURE MEASURING INSTRUMENT
2.1 Resistance Thermometers
2.1.1 The operating principle is based on the variations of resistance as
a function of temperature. Resistance thermometers are designed and
constructed for embedment in mass concrete for measurement of internal
temperatures. A typical resistance thermometer which is designed to be
embedded permanently and directly in the mass concrete is shown in
Fig. 1.
c
2.1.2 The coils of resistance thermometers are wound with suitable
platinum-or enamelled copper wire wound non-inductively on an insulat-
ing core so as to have a definite resistance at predetermined temperature.
The thermometers shall have a fixed resistance change over the tem-
perature change of 0 to 100°C. The entire resistance element shall
be encased in a soldered brass case to prevent entrance of moisture and
the element shall be further protected by filling the inside of the case with
joint sealing compound to ensure thermal contact between the coil and the
casing.
*Rules for rounding off numerical values ( raised ).
3
IS:6524-1972
TIBRE
WASHER
COPPER WIRE COIL
ROUNDBOTTOM
SOLDERCABLE
CABLE LEADS SEALTO SHELL
SOLDER END SEAL
IL TERMINALS
WOO0 SCREWS)
BOND PAPER INSULATOR
14mm THREE-CONDUCTOR
RUBBER-INSULATEDRUBBER-
WICARTAINSU SHEATHED ELECTRICALCABLE
FIG. 1 EMBEDDEDTYPE RESISTANCETHERMOMETER
2.2 Measuring Circuits-The measuring circuits shall be in accordance
with IS : 2806-1964* or any suitable instruments.
3. NUMBER AND LOCATION
3.1 Apart from the externally imposed load and deformation conditions
the greatest single factor in causing stresses in massive concrete structures
is temparature change. Thus, it is imperative jhat temperature be
measured accurately at many points in the structures.
3.2 It is often sufficient to select those portions of the dam for measure-
ment which are typical, on the one hand, and those which are most
severe on the other hand and to concentrate the measurements in such
locations.
3.3 Since strain meters and stress meters installed in dams for strain and
stress measurements provide an accurate measurement of temperature
together with their other indications, there is no need of duplicate instru-
ments for this information at these main points of measurement. However,
sufficient resistance thermometers should be embedded at intermediate
points to give a complete picture of the temperature in the body of the
structure.
3.4 A typical scheme would be to place a thermometer in 15 x 15 m grid
horizontally and vertically in a minimum of one block in the spillway
portion, a minimum of one block in the non-overflow portion of the
dam and in other portions depending upon the data required for detailed
study of the structural behaviour of the dam.
*Methods of temperature measurement by electrical resistance thermometers.
4
L
3.5 A ~few thermometers should be placed near and in the downstream
face to evaluate the rapid daily fluctuations in temperature. Thermo-
meters placed in the upstream face as a continuation of the main thermo-
meter grid will serve to evaluate lake temperatures close to the dam.
3.6 In order to better define the steep thermal gradients which may be
more prominent near the upstream and the downstream faces of the dam,
it is desirable to place thermometers at 15 cm, 1 m, 2 m and 3 m from both
the downstream faces of the dam in addition to those in the grid.
3.7 For measurement of foundation temperature, thermometers should be
placed near the base of the dam and also in holes drilled into the
foundation at desired locations.
3.8 In order to study the effect of operating penstocks and river outlets, on
the temperature of surrounding concrete mass, one line of thermometers
should be installed, spacing of thermometers from the outside of penstock
or outlet pipe being 15 cm, -1 m, 2 m and further as required.
4. INSTALLATION
4.1 In the embedment of a resistance thermometer orientation is not
critical and the meter is very rugged. Prior to embedment of resistance
thermometers in newly placed concrete, each instrument should be
thoroughly checked for meter resistance and lead resistance to assure that
all units are in proper operation condition. Immediately after embedment
of the thermometer, the location may be covered either with a wooden
plank or any temporary protecting device, to protect the thermometer
from any damage that is likely to occur during further concreting
operations. Identification tags should also be attached to each thermo-
meter and careful record maintained about the location where each
instrument is laid.
4.2 Some preparation is necessary prior to embedment. This varies with
the type of embedment.
4.2.1 For embedment in the middle of a lift, it has been found helpful to
give each thermometer a quick dip in sealing compound as specified by
the user, and tape with one layer of friction type tape for additional shock
resistance and additional water-proofing insurance during embedment.
4.2.2 Where resistance thermometers are to be embedded at the up-
stream fact to measure water temperatures, additional water-proofing,
against hydrostatic pressure is furnished by encasing the thermometer in a
suitable length of grout tubing which is then completely filled with sealing
compound as specified by the user.
4.2.2.1 For fixing the thermometer at the upstream or downstream
face the method shown in Fig. 2 is recommended. As an alternative the
thermometer may be held by hand against the form while concrete is back
fiIled around it. It is perhaps better, however, to tie the thermometer
5
IS : 6524 - 1972
to the form with light wires and provide anchors onto the meter case and
back into the concrete so that the thermometer will not be pulled out
of the weak concrete, when the form is stripped. Trenches are formed in
the fresh concrete for routing the cables from the thermometer to the
terminal board location, or if the latter is located in a gallery of the
dam below the thermometer location, the cables are routed to a conduit
leading from the gallery. Frequently the cable trench is made by
vibrating a length of 20 x 20 cm timber into the fresh concrete after
the individual thermometers have been arranged. The timber is then
removed from the trench, the lead cables placed in the depression and the
depression backfilled with concrete by hand to cover the cables.
4.2.3 For embedment at the base of a lift, it is best to tie down
some wires to the concrete of the previous lift or between two cooling
pipes. The thermometer may then be wired or taped securely, to hold
down the thermometer so that the pressure of the mass concrete will
not dislodge it.
4.2.4 For an installation at the top of a lift, a small hole may be
dug and the thermometer inserted and covered immediately, using the
foot, or a vibrator, to puddle the concrete around the instrument. For
accurate spacing at various heights in a lift, the thermometers have
sometimes been taped to a wood pole carefully maintained in vertical
position.
4.3 Cables and Conduits
4.3.1 Rubber-insulated, rubber-covered stranded copper cables have
proved tough and resilient enough to give good service during the shocks
of embedment, and during its long exposure to the alkaline solutions
of the hydrating concrete. In general, cables run from the instrument to
the nearest gallery for their terminal locations; horizontally directly in the
concrete without conduit, and in downward and upward directions in
conduit. The conduit may be of almost any material which will not
collapse in the fresh concrete. The size of the conduit may easily be
chosen by drawing circles of the diameter of the cable. In order to allow
for ~pulling friction and cable crosses, provide for one and half times
the number of cables where the conduit run is short, up to twice the
number of circles as there are cables where the runs are long or there are
many bends. Circumscribe these circles with a larger one to find the
inside diameter of the conduit.
4.3.2 If the cable leads are to cross expansion or contraction joints
in the structure a slack cable recess should be provided at the crossing
point. This may consist of a wooden box block out, forming a recess into
which the cable is run. During placement of concrete in the adjacent
block a 30 cm loop of slack cable is left in the unfilled block o!rt and
the remaining length of cable laid in the usual manner.
6
CABLE JOINT COMPOUND (ANY
SUITABLE SEALING COMPOUN
25mm (b THIN WALL TUBING PAINTED
OUTSIDE WITII‘COALTAR PAINT
SECTION XX
. *
HOLD DlDWN CLIP :
All dimensions in millimetres.
FIG. 2 TYPICAL LAYOUT OF SURFACE THERMOMETERS
7
IS:6!324-1972
4.3.3 Cables should be threaded individually into the conduit, SO
that each cable will be required to support only iLs otin weight. At the
entrance of the cables into the conduit suitable protection, such as
padding with burlap, should be provided around each cable and in the
interstices between the cables to prevent sharp bends and to prevent
the entrance of concrete and grout into conduit.
4.3.4 Where a group of many cables is to be run horizontally in a
lift, they may be taped together at intervals and laid on the top of
the next to last layer of concrete in the lift, dovered with pads of
fresh concrete at several points along their length, and placement of
the final concrete lift layer allowed to proceed in the normal manner.
Single or pairs of cables leads may be ‘walked into’ the concrete.
4.3.5 The layout should be planned so that meters and terminal
boards are in the same block.
4.3.6 In the general case where a number of cables from widely
separated points are collected at one central point and run downward in
conduit, a very successful plan is to run the cable in two steps. A
collecting box or concrete form is erected around the grouped conduits
so that the lift is left about 45 cm low at the conduits. During the
placement of the concrete in which the meters are embedded, the cables
are brought horizontally to the collection point and there coiled and hung
out of the fresh concrete. As Soon as the concrete has set sufficiently to
bear traffic, the cable coils are taken down the conduit to the terminal
boards. The advantages are that it is much easier to sort and run cables
when they are not muddied with fresh concrete.
4.4 Terminal Boards - The cables should be terminated in a suitable
terminal board.
5. OBSERVATIONS
5.1 The observations of the instruments should begin as soon as the
instruments are covered and continue at gradually increased time
intervals. As the concrete -hydrates, the resulting heat induces volume
changes and consequent stress change which vary rapidly during the early
days of the concrete and more slowly later. Hence enough observations
shall be available to give the complete picture of these changing
conditions of temperature. The following sliding schedule that has proved
effective is recommended:
a) An observation as soon as the meters are covered ( embedded )
and two more that day;
b) TWO observations on the second day;
c) One reading per day for ten days or until maximum temperature
is reached;
8
IS : 6524 - 1972
d) Reading every other day for ten more days;
e) Thereafter, twice weekly for a month; and
f) Thereafter, weekly until the construction is completed. Usually
available help falls off sharply at the end of the construction
period and observations should be continued on a twice a month
basis, if help can be spared but not less than monthly, if the help
situation is critical.
5.2 A recommended pro forma for the record of observations in the field
and for transfer of observations to a permanent record in the office is
given in Appendix A. Suitable data sheets should be printed in advance
upon which the observations can be noted as they are taken and for
preparation of permanent records.
5.3 Resistance thermometers are based OK the fact that the ohmic
resistance of a metal wire varies at a practically linear rate with the
temperature. The thermometer readings are taken by a test set operating
on the Wheatstone Bridge principle,
5.3.1 With the calibration provided for the thermometers (resistance
at 0°C and the change of resistance per “C), resistance readings can be
converted directly to temperature.
6. SOURCES OF ERROR
6.1 The following are the sources of error in measurement of temperature
by resistance thermometers and should be checked frequently:
4
b)
4
4
Low voltage of test set batteries,
Loose connection of cable terminals on terminal panels,
Loose connections in the test set circuit, and
High voltage may cause heating of the wire and thus affect
-accuracy of the reading.
IS : 6524 - 1972
APPENDIX A
( Clause !i 7 1
THERMOMETER DATA SHEET
Field Record Sheet
Project:
Ambient temperature “C
Reservoir level:
Sheet. ........ .....of.. ..................
Date:
Observer:
THERMOMETER
NO.
TIME OF METER RESISTANCE REMARKS
OBSERVATIO~U _---h-_-~
Previous Present
Reading Meter
with Date Reading
Temperature Data Permanent Record
Project: Sheet . .. . . ... . ... .. .of... .. . . . _ .. .._
Thermometer No. .......... .......
Location: Block.. ..........Chainage.. ......*Station. .. .........Elevation.. ......
Meter resistance at “C... .....................
4.
Change in temperature per ohm change in resistance .... .... ..._..“C
DATE TIME METER RESIZANCE TEMPERATURE OBSERVER REMARKS
Q “C
NOTE- Record any observationslike overflow of water, etc, which are likely to
influence the reading of any thermometerwhich may deviate from the normal,
BUREAU OF JNDIAN STANDARDS
Heedquarters:
Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 1lOQO2
Telephones: 323 0131, 323 3375, 323 9402
Fax : 91 11 3234062, 91 113239399, 91 113239382
Telegrams : Manaksanstha
(Common to all Offices)
Central Laboratory: Telephone
Plot No. 2019, Site IV, Sahibabad Industrial Area, SAHIBABAD 201010 6-77 00 32
Regional Offices:
Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002 323 76 17
‘Eastern : l/l4 CIT Scheme VII M, V.I.P. Road, Maniktola, CALCUTTA700054 337 86 62
Northern : SC0 335-336, Sector 34-A, CHANDIGARH 160022 60 38 43
Southern : C.I.T. Campus, IV Cross Road, CHENNAI 600113 235 23 15
twestern : Manakalaya, E9 Behind Mar01 Telephone Exchange, Andheri (East), 832 92 95
MUMBAl 400093
Branch Offices:
‘Pushpak’, Nurmohamed Shaikh Marg, Khanpur, AHMEDABAD 380001
*Peenya Industrial Area, 1st Stage, Bangalore -Tumkur Road,
550 13 48
839 49 55
BANGALORE 560058
Gangotri Complex, 5th Floor, Bhadbhada Road, T. T. Nagar. BHOPAL 462003 55 40 21
Plct No. 62-63. Unit VI. Ganga Nagar. BHUBANESHWAR 751001 40 36 27
Kalaikathir Buttdings. 670 Avinashi Road, COiMBATORE 641037 21 01 41
Plot No. 43. Sector 16 A, Mathura Road, FARIDABAD 121001 8-28 88 01
Savitri Complex, 116 G. T. Road, GHAZIABAD 201001 8-71 19 96
5315 Ward No. 29, R. G. Barua Road, 5th By-lane, GUWAHATl 781003 54 11 37
5-8-58C. L. N Gupta Marg, Nampally Station Road, HYDERABAD 500001 20 10 83
E-52, Chitaranjan Marg, C-Scheme, JAIPUR 302001 37 29 25
1171418 B. Sarvodaya Nagar. KANPUR 208005 21 68 76
Seth Bhawan, 2nd Floor, Behind Leela Cinema, Naval Kishore Road, 23 89 23
LUCKNOW 226001
Patliputra Industrial Estate, PATNA 800013
T. C. No. 14/1421, University P. 0. Palayam,
THIRUVANANTHAPURAM 695034
NIT Building, Second Floor, Gokulpat Market, NAGPUR 440010
Institution of Engineers ( India ) Building, 1332 Shivaji Nagar, PUNE 411005
26 23 05 i
6 21 17
52 51 71
32 36 35
‘Sales Office IS at 5 Chowringhee Approach, P 0. Princep Street,
CALCUTTA 700072
tSales Office is at Novelty Chambers, Grant Road, MUMBAI 400007
*Sales Office is at ‘F’ Block, Unity Building, Narashimaraja Square,
BANGALORE 560002
27 10 85
309 65 28
222 39 71

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6524

  • 1. IS : 6524 - 1972 ( Reaffirmed 1991) Indian Standard CODE OF PRACTICE FOR INSTALLATION AND OBSERVATION OF INSTRUMENTS FOR TEMPERATURE MEASUREMENTS INSIDE DAMS : RESISTANCE TYPE THERMOMETERS (Third Reprint JULY 1998 ) UDC 536.531 : 627.8 0 Copyright 1973 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 Gr 3 February 1973
  • 2. Indian Standard CODE OF PRACTICE FOR INSTALLATION AND OBSERVATION OF INSTRUMENTS FOR TEMPERATURE MEASUREMENTS INSIDE DAMS : RESISTANCE TYPE THER MO-METERS Instrumentation Sectional Committee, BDC 60 Members Representing DR B. K. AQARWALA National Physical Laboratory ( CSIR ), New Delhi SHRI B. S. BWALLA Beas Designs Organization, Nangal Township DR G. P. MALHOTRA ( Alterna!e ) SHRI N. M. CHAERABORTY Damodar Valley Corporation, Dhanbad CHIEF ENGINEER ( IRR~ATI~N) -Publi;ay;rks Department, Government of Tamil SHRI P. KUMARA~WAMY ( A&mate ) SHRI P. P. DWIVEDI Central Scientific Instruments Organization ( CSIR ), SHRI P. GOSWAMI Chandigarh Philips India Limited. Bombav SRRI K. BASU ( Alternote) SHRI I. P. KAPILA Central Board of Irrigation and Power, New Delhi SHRI R. RAJARAMAN ( Alternate ) SHRI B. S. KAPRE RESEARCH OFFICER ( Altematc ) Maharashtra Engineering Research Institute, Nasik SHRI 2. M. KARACEIWALA Vasi Shums & Co Pvt Ltd, Bombay ) KUMARI A. MANI Meteorological Department, Government of India, New Delhi SHRI V. N. NA~ARAJA SRRI R. G. PATEL Ministry of Irrigation & Power, New Delhi SHRIJ. RAMALINQAM Public Works Department, Government of Gujarat Central Water & Power Commission, New Delhi SHRI K. S. RAO SERI H. C. VERMA Electronics Corporation of India Limited, Hyderabad Associated Instruments Manufacturers ( India ) Pvt Ltd, New Delhi SERI K. G. PURAN~ ( Alternate ) SHRI D. AJITHA SIMHA, Director ( Civ Engg ) Director General, IS1 ( Ex-ojkio Member ) Secretary SHRI G. RAMAN Deputy Director ( Civ Engg ), IS1 BUREAU OF INDIAN STANDARDS MANAR BHAVAN, 9 BAHADUR SHAH ZAFAR hfARG NEW DELHI 110002
  • 3. IS :6524- 1972 Indian Standard CODE OF PRACTICE FOR INSTALLATION AND OBSERVATION OF INSTRUMENTS FOR TEMPERATURE MEASUREMENTS INSIDE DAMS : RESISTANCE TYPE THERMOMETERS 0. FOREWORD &I This Indian Standard was adopted by the Indian Standards Institution on 25 February 1972, after the draft finalized by the Instrumentation Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 Volume change and stress occur in concrete dams due to temperature changes also. The temperature changes arise from both external and internal causes. The temperature effect may be of two general types in mass concrete, namely: a) The effect due to the chemical reaction of cement combining with water, and b) The effect due to climatic conditions. 0.3 The temperatures of the faces of a dam are affected by radiant heating, evaporation of water on the face of the dam, reservoir water, etc. The surface temperature is important because generally cracking begins at a surface. 0.4 The surface temperature is important to study the effect of ambient temperature on the surface of the structures and the temperature gradient through the dam. ‘1he external heating and cooling is as important as the heating from within caused by the chemical reaction of the cement combining with water. Most of the internal heating occurs during the first few weeks after casting, but it continues for many years after the dam is completed. Thus, in order to determine the effect of temperature on the stress and volume change in a dam, temperature should be measured at a number of points within the dam, as well as at the boundaries. However, it is not necessary to determine the detailed temperature history of every portion of dam. 2
  • 4. ISr6524-1972 0.5 This standard contains clauses which require the user to specify certain technical requirements at the time of placing orders for thermometers. The relevant clauses are 4.2.1 and 4.2.2. 0.6 In the formulation of this standard due weightage has been given to international co-ordination among the standards and practices prevail- ing in different countries in addition to relating it to the practices in the field in this country. 0.7 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 or analysis, shall be rounded off in accord- ance with IS : 2-l 960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard covers the details of installation and observation of resistance type thermometers of the embedded type for measuring the temperature in the interior of a concrete dam and such other structures. 2. TEMPERATURE MEASURING INSTRUMENT 2.1 Resistance Thermometers 2.1.1 The operating principle is based on the variations of resistance as a function of temperature. Resistance thermometers are designed and constructed for embedment in mass concrete for measurement of internal temperatures. A typical resistance thermometer which is designed to be embedded permanently and directly in the mass concrete is shown in Fig. 1. c 2.1.2 The coils of resistance thermometers are wound with suitable platinum-or enamelled copper wire wound non-inductively on an insulat- ing core so as to have a definite resistance at predetermined temperature. The thermometers shall have a fixed resistance change over the tem- perature change of 0 to 100°C. The entire resistance element shall be encased in a soldered brass case to prevent entrance of moisture and the element shall be further protected by filling the inside of the case with joint sealing compound to ensure thermal contact between the coil and the casing. *Rules for rounding off numerical values ( raised ). 3
  • 5. IS:6524-1972 TIBRE WASHER COPPER WIRE COIL ROUNDBOTTOM SOLDERCABLE CABLE LEADS SEALTO SHELL SOLDER END SEAL IL TERMINALS WOO0 SCREWS) BOND PAPER INSULATOR 14mm THREE-CONDUCTOR RUBBER-INSULATEDRUBBER- WICARTAINSU SHEATHED ELECTRICALCABLE FIG. 1 EMBEDDEDTYPE RESISTANCETHERMOMETER 2.2 Measuring Circuits-The measuring circuits shall be in accordance with IS : 2806-1964* or any suitable instruments. 3. NUMBER AND LOCATION 3.1 Apart from the externally imposed load and deformation conditions the greatest single factor in causing stresses in massive concrete structures is temparature change. Thus, it is imperative jhat temperature be measured accurately at many points in the structures. 3.2 It is often sufficient to select those portions of the dam for measure- ment which are typical, on the one hand, and those which are most severe on the other hand and to concentrate the measurements in such locations. 3.3 Since strain meters and stress meters installed in dams for strain and stress measurements provide an accurate measurement of temperature together with their other indications, there is no need of duplicate instru- ments for this information at these main points of measurement. However, sufficient resistance thermometers should be embedded at intermediate points to give a complete picture of the temperature in the body of the structure. 3.4 A typical scheme would be to place a thermometer in 15 x 15 m grid horizontally and vertically in a minimum of one block in the spillway portion, a minimum of one block in the non-overflow portion of the dam and in other portions depending upon the data required for detailed study of the structural behaviour of the dam. *Methods of temperature measurement by electrical resistance thermometers. 4 L
  • 6. 3.5 A ~few thermometers should be placed near and in the downstream face to evaluate the rapid daily fluctuations in temperature. Thermo- meters placed in the upstream face as a continuation of the main thermo- meter grid will serve to evaluate lake temperatures close to the dam. 3.6 In order to better define the steep thermal gradients which may be more prominent near the upstream and the downstream faces of the dam, it is desirable to place thermometers at 15 cm, 1 m, 2 m and 3 m from both the downstream faces of the dam in addition to those in the grid. 3.7 For measurement of foundation temperature, thermometers should be placed near the base of the dam and also in holes drilled into the foundation at desired locations. 3.8 In order to study the effect of operating penstocks and river outlets, on the temperature of surrounding concrete mass, one line of thermometers should be installed, spacing of thermometers from the outside of penstock or outlet pipe being 15 cm, -1 m, 2 m and further as required. 4. INSTALLATION 4.1 In the embedment of a resistance thermometer orientation is not critical and the meter is very rugged. Prior to embedment of resistance thermometers in newly placed concrete, each instrument should be thoroughly checked for meter resistance and lead resistance to assure that all units are in proper operation condition. Immediately after embedment of the thermometer, the location may be covered either with a wooden plank or any temporary protecting device, to protect the thermometer from any damage that is likely to occur during further concreting operations. Identification tags should also be attached to each thermo- meter and careful record maintained about the location where each instrument is laid. 4.2 Some preparation is necessary prior to embedment. This varies with the type of embedment. 4.2.1 For embedment in the middle of a lift, it has been found helpful to give each thermometer a quick dip in sealing compound as specified by the user, and tape with one layer of friction type tape for additional shock resistance and additional water-proofing insurance during embedment. 4.2.2 Where resistance thermometers are to be embedded at the up- stream fact to measure water temperatures, additional water-proofing, against hydrostatic pressure is furnished by encasing the thermometer in a suitable length of grout tubing which is then completely filled with sealing compound as specified by the user. 4.2.2.1 For fixing the thermometer at the upstream or downstream face the method shown in Fig. 2 is recommended. As an alternative the thermometer may be held by hand against the form while concrete is back fiIled around it. It is perhaps better, however, to tie the thermometer 5
  • 7. IS : 6524 - 1972 to the form with light wires and provide anchors onto the meter case and back into the concrete so that the thermometer will not be pulled out of the weak concrete, when the form is stripped. Trenches are formed in the fresh concrete for routing the cables from the thermometer to the terminal board location, or if the latter is located in a gallery of the dam below the thermometer location, the cables are routed to a conduit leading from the gallery. Frequently the cable trench is made by vibrating a length of 20 x 20 cm timber into the fresh concrete after the individual thermometers have been arranged. The timber is then removed from the trench, the lead cables placed in the depression and the depression backfilled with concrete by hand to cover the cables. 4.2.3 For embedment at the base of a lift, it is best to tie down some wires to the concrete of the previous lift or between two cooling pipes. The thermometer may then be wired or taped securely, to hold down the thermometer so that the pressure of the mass concrete will not dislodge it. 4.2.4 For an installation at the top of a lift, a small hole may be dug and the thermometer inserted and covered immediately, using the foot, or a vibrator, to puddle the concrete around the instrument. For accurate spacing at various heights in a lift, the thermometers have sometimes been taped to a wood pole carefully maintained in vertical position. 4.3 Cables and Conduits 4.3.1 Rubber-insulated, rubber-covered stranded copper cables have proved tough and resilient enough to give good service during the shocks of embedment, and during its long exposure to the alkaline solutions of the hydrating concrete. In general, cables run from the instrument to the nearest gallery for their terminal locations; horizontally directly in the concrete without conduit, and in downward and upward directions in conduit. The conduit may be of almost any material which will not collapse in the fresh concrete. The size of the conduit may easily be chosen by drawing circles of the diameter of the cable. In order to allow for ~pulling friction and cable crosses, provide for one and half times the number of cables where the conduit run is short, up to twice the number of circles as there are cables where the runs are long or there are many bends. Circumscribe these circles with a larger one to find the inside diameter of the conduit. 4.3.2 If the cable leads are to cross expansion or contraction joints in the structure a slack cable recess should be provided at the crossing point. This may consist of a wooden box block out, forming a recess into which the cable is run. During placement of concrete in the adjacent block a 30 cm loop of slack cable is left in the unfilled block o!rt and the remaining length of cable laid in the usual manner. 6
  • 8. CABLE JOINT COMPOUND (ANY SUITABLE SEALING COMPOUN 25mm (b THIN WALL TUBING PAINTED OUTSIDE WITII‘COALTAR PAINT SECTION XX . * HOLD DlDWN CLIP : All dimensions in millimetres. FIG. 2 TYPICAL LAYOUT OF SURFACE THERMOMETERS 7
  • 9. IS:6!324-1972 4.3.3 Cables should be threaded individually into the conduit, SO that each cable will be required to support only iLs otin weight. At the entrance of the cables into the conduit suitable protection, such as padding with burlap, should be provided around each cable and in the interstices between the cables to prevent sharp bends and to prevent the entrance of concrete and grout into conduit. 4.3.4 Where a group of many cables is to be run horizontally in a lift, they may be taped together at intervals and laid on the top of the next to last layer of concrete in the lift, dovered with pads of fresh concrete at several points along their length, and placement of the final concrete lift layer allowed to proceed in the normal manner. Single or pairs of cables leads may be ‘walked into’ the concrete. 4.3.5 The layout should be planned so that meters and terminal boards are in the same block. 4.3.6 In the general case where a number of cables from widely separated points are collected at one central point and run downward in conduit, a very successful plan is to run the cable in two steps. A collecting box or concrete form is erected around the grouped conduits so that the lift is left about 45 cm low at the conduits. During the placement of the concrete in which the meters are embedded, the cables are brought horizontally to the collection point and there coiled and hung out of the fresh concrete. As Soon as the concrete has set sufficiently to bear traffic, the cable coils are taken down the conduit to the terminal boards. The advantages are that it is much easier to sort and run cables when they are not muddied with fresh concrete. 4.4 Terminal Boards - The cables should be terminated in a suitable terminal board. 5. OBSERVATIONS 5.1 The observations of the instruments should begin as soon as the instruments are covered and continue at gradually increased time intervals. As the concrete -hydrates, the resulting heat induces volume changes and consequent stress change which vary rapidly during the early days of the concrete and more slowly later. Hence enough observations shall be available to give the complete picture of these changing conditions of temperature. The following sliding schedule that has proved effective is recommended: a) An observation as soon as the meters are covered ( embedded ) and two more that day; b) TWO observations on the second day; c) One reading per day for ten days or until maximum temperature is reached; 8
  • 10. IS : 6524 - 1972 d) Reading every other day for ten more days; e) Thereafter, twice weekly for a month; and f) Thereafter, weekly until the construction is completed. Usually available help falls off sharply at the end of the construction period and observations should be continued on a twice a month basis, if help can be spared but not less than monthly, if the help situation is critical. 5.2 A recommended pro forma for the record of observations in the field and for transfer of observations to a permanent record in the office is given in Appendix A. Suitable data sheets should be printed in advance upon which the observations can be noted as they are taken and for preparation of permanent records. 5.3 Resistance thermometers are based OK the fact that the ohmic resistance of a metal wire varies at a practically linear rate with the temperature. The thermometer readings are taken by a test set operating on the Wheatstone Bridge principle, 5.3.1 With the calibration provided for the thermometers (resistance at 0°C and the change of resistance per “C), resistance readings can be converted directly to temperature. 6. SOURCES OF ERROR 6.1 The following are the sources of error in measurement of temperature by resistance thermometers and should be checked frequently: 4 b) 4 4 Low voltage of test set batteries, Loose connection of cable terminals on terminal panels, Loose connections in the test set circuit, and High voltage may cause heating of the wire and thus affect -accuracy of the reading.
  • 11. IS : 6524 - 1972 APPENDIX A ( Clause !i 7 1 THERMOMETER DATA SHEET Field Record Sheet Project: Ambient temperature “C Reservoir level: Sheet. ........ .....of.. .................. Date: Observer: THERMOMETER NO. TIME OF METER RESISTANCE REMARKS OBSERVATIO~U _---h-_-~ Previous Present Reading Meter with Date Reading Temperature Data Permanent Record Project: Sheet . .. . . ... . ... .. .of... .. . . . _ .. .._ Thermometer No. .......... ....... Location: Block.. ..........Chainage.. ......*Station. .. .........Elevation.. ...... Meter resistance at “C... ..................... 4. Change in temperature per ohm change in resistance .... .... ..._..“C DATE TIME METER RESIZANCE TEMPERATURE OBSERVER REMARKS Q “C NOTE- Record any observationslike overflow of water, etc, which are likely to influence the reading of any thermometerwhich may deviate from the normal,
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