1、BRITISH STANDARD AEROSPACE SERIES BS3G148: 1981 Specification for General purpose platinum temperature sensors for aircraft UDC 629.7.054:536.531BS3G148:1981 This BritishStandard, having been prepared under the directionof the Aerospace Standards Committee, was published under the authority ofthe Bo
2、ard of BSI and comesintoeffect on 31December1981 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/30 Draft for comment80/76254 DC ISBN 0 580 12482 7 Foreword This BritishStandard, which is a revision of BS2G148:1963, isapplicable to general purpose
3、 platinum resistance temperature sensors for use in aircraft. Sensors suitable for the measurement of outside air temperatures will be the subject of another BritishStandard in the “G” series. Although the sensors are intended for use on d.c. electrical supplies, they may, if non-inductively wound,
4、be suitable for use in a.c. systems up to400Hz. The revised standard differs from the1963 edition in the following respects. a) The introduction of a resistance of1007 at0 C in line with other International Standards. b) The sensor characteristics and tolerances are now in agreement with EECstandard
5、s. c) The deletion of the connector and the introduction of high temperature capability cable(200 C). d) The deletion of the loose olive and replacement with a fixed olive of metricdimensions. e) The dimensions of the sensor olive, nut and boss are compatible with thosespecified in SBAC 1)standards
6、AS43021, AS43022, and AS43023. f) The addition of specific test requirements relating to the performance of the sensors. g) The introduction of a clause stating the characteristics to be declared by the manufacturer relating to immersion error. This BritishStandard supersedesBS 2G148:1963, which is
7、therefore withdrawn. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages Thi
8、s document comprises a front cover, an inside front cover, pagesi andii, pages1 to8 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Society of British Aerospace
9、 Companies Ltd. Amendments issued since publication Amd. No. Date of issue CommentsBS3G148:1981 BSI 12-1999 i Contents Page Foreword Inside front cover 1 Scope 1 2 References 1 3 General constructional requirements 1 4 Design and performance requirements 1 5 Marking 3 Appendix A Apparatus and proced
10、ures for immersion error test and thermo-electrical effect test 4 Figure 1 Platinum temperature sensor90 angled configuration 5 Figure 2 Platinum temperature sensor straight configuration 6 Figure 3 Mounting details 7 Figure 4 Schematic diagram of test apparatus for determination ofimmersionerror an
11、d thermo-electrical effect 8 Table 1 Resistance/temperature relationship 2 Table 2 Limits of intrinsic error 3ii blankBS3G148:1981 BSI 12-1999 1 1 Scope This BritishStandard specifies the general design and performance requirements for platinum resistance temperature sensors designed for the measure
12、ment of the temperature of gases or fluids in small diameter ducts. The sensors are designed for satisfactory operation for the measurement of fluid temperature whilst under high pressure. The temperature-resistance relationship is based on a sensor having a resistance of1007 at0 C. 2 References Thi
13、s standard makes reference to the following standards publications. BS G210, PTFE insulated equipment wires (with silver plated copper conductors). BS 3G100, General requirements for equipment for use in aircraft. 3 General constructional requirements 3.1 The design and construction of the platinum
14、resistance temperature sensors shall conform to the outlines given in Figure 1 or Figure 2 and shall be such as to comply with the relevant environmental requirements of BS3G100. 3.2 The sensors shall be constructed from corrosion-resistant materials and no materials which are fungi nutrients shall
15、be used. The user shall exercise care in selecting materials for the overall assembly to minimize electrolytic action between dissimilar metals. 4 Design and performance requirements 4.1 Temperature range. The temperature range shall be70 C to+450 C, subject to the connecting cable being kept to a t
16、emperature not exceeding+200 C. 4.2 Temperature-resistance relationship and tolerances. The sensor shall have a nominal resistance of1007 at0 C. The temperature-resistance relationship shall be as shown in Table 1. The limits of intrinsic error shall not exceed those given in Table 2. The values giv
17、en in Table 1 have been calculated from the following temperature-resistance relationships. Characteristics For the range70 C to0 C: R t = R 0 1+At+Bt 2 +C (t100 C) t 3 For the range of0 C to450 C: R t = R 0 (1+At+Bt 2 ) The values of the constants in these equations are as follows: A=3.90802 10 3 C
18、 1 B=5.802 10 7 C 2 C=4.27350 10 12 C 4 R 0 is the resistance at0 C and R tthe resistance at t C. These equations are listed as the basis for the temperature-resistance tables of this standard and are not intended to be used for the calibration of individual thermometers. Values of temperature in th
19、is standard are in the International Practical Temperature Scale (IPTS) of1968. 4.3 Self-heating. With the sensor immersed in water at20 C flowing at1m/s transverse to the axis of the sensor, the I 2 R power dissipated in it shall not cause an indicated temperature rise of greater than+0.01 C/mW. In
20、 still air the error shall not be greater than0.25 C/mW. 4.4 Time constant (response time). When quickly plunged into water at approximately80 C moving at1m/s with flow transverse to the axis of the sensor,63%of the response to the step of temperature shall take place in less than1.5s. 4.5 Stability
21、. The sensor shall withstand10 consecutive temperature shocks from70 C to+20 C or10 shocks from+450 C to+20 C at a rate of not less than25 C/min, after which the resistance at0 C shall not change by more than 0.05%. 4.6 Insulation resistance. When measured with a500Vd.c. insulation tester the insula
22、tion resistance between the electrical conductors and the sheath of the sensor shall be not less than20M7 at20 5 C, and1M7 at the working temperature. 4.7 Maximum current. The sensor shall withstanda continuous current of20mA without de-rangement. 4.8 Pressure. The sensor sheath shall withstand a wo
23、rking pressure of27.6MPa(276bar). Whilst at this pressure there shall be no change in measured resistance compared with the unpressurized state. 4.9 Vibration. The sensor when correctly mountedin the standard boss shall withstand without failure the vibration environment as specified inBS 3G100-2.3.
24、1, for region D, for use on any partofthe airframe, excluding direct contact with the power unit. The cable shall be adequately supported. The supplier shall declare the maximum sensor length up to which this requirement can bemet.BS3G148:1981 2 BSI 12-1999 Table 1 Resistance/temperature relationshi
25、p R 0 =100.007 Degrees Celsius IPTS1968 0 1 2 3 4 5 6 7 8 9 10 Degrees Celsius IPTS1968 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 7 72.33 76.33 80
26、.31 84.27 88.22 92.16 96.09 100.00 100.00 103.90 107.79 111.67 115.54 119.40 123.24 127.07 130.89 134.70 138.50 142.29 146.06 149.82 153.58 157.31 161.04 164.76 168.46 172.16 175.84 179.51 183.17 186.82 190.45 194.07 197.69 201.29 204.88 208.45 212.02 215.57 219.12 222.65 226.17 229.67 233.17 236.65
27、 240.13 243.59 247.04 250.48 253.90 257.32 260.72 264.11 7 75.93 79.91 83.83 87.83 91.77 95.69 99.61 100.39 104.29 108.18 112.06 115.93 119.78 123.62 127.45 131.27 135.08 138.88 142.66 146.44 150.20 153.95 157.69 161.42 165.13 168.83 172.53 176.21 179.83 183.53 187.18 190.81 194.44 198.05 201.65 205
28、.23 208.81 212.37 215.93 219.47 223.00 226.52 230.02 233.52 237.00 240.47 243.93 247.38 250.82 254.24 257.66 261.06 7 75.50 79.51 83.48 87.43 91.37 95.30 99.22 100.78 104.68 108.57 112.45 116.31 120.16 124.01 127.84 131.66 135.46 139.26 143.04 146.81 150.57 154.32 158.06 161.79 165.50 169.20 172.90
29、176.57 180.24 183.90 187.54 191.18 194.80 198.41 202.01 205.59 209.17 212.73 216.28 219.82 223.35 226.87 230.37 233.87 237.35 240.82 244.28 247.73 251.16 254.59 258.00 261.40 7 75.13 79.11 83.08 87.04 90.98 94.91 98.83 101.17 105.07 108.96 112.83 116.70 120.55 124.39 128.22 132.04 135.84 139.64 143.
30、42 147.19 150.95 154.70 158.43 162.16 165.87 169.57 173.26 176.94 180.61 184.26 187.91 191.54 195.16 198.77 202.36 205.95 209.52 213.09 216.64 220.18 223.70 227.22 230.72 234.22 237.70 241.17 244.62 248.07 251.50 254.93 258.34 261.74 7 74.73 78.72 82.69 86.64 90.59 94.52 98.44 101.56 105.46 109.35 1
31、13.22 117.08 120.93 124.77 128.60 132.42 136.22 140.02 143.80 147.57 151.33 155.07 158.81 162.53 166.24 169.94 173.63 177.31 180.97 184.63 188.27 191.90 195.52 199.13 202.72 206.31 209.88 213.44 216.99 220.53 224.06 227.57 231.07 234.56 238.04 241.51 244.97 248.41 251.85 255.27 258.68 262.08 7 74.33
32、 78.32 82.29 86.25 90.19 94.12 98.04 101.95 105.85 109.73 113.61 117.47 121.32 125.16 128.98 132.80 136.60 140.39 144.17 147.94 151.70 155.45 159.18 162.90 166.61 170.31 174.00 177.68 181.34 184.99 188.63 192.26 195.88 199.49 203.08 206.67 210.24 213.80 217.35 220.88 224.41 227.92 231.42 234.91 238.
33、39 241.86 245.31 248.76 252.19 255.61 259.02 262.42 7 73.93 77.92 81.89 85.85 89.80 93.73 97.65 102.34 106.24 110.12 113.99 117.85 121.70 125.54 129.37 133.18 136.98 140.77 144.55 148.32 152.08 155.82 159.55 163.27 166.98 170.68 174.37 178.04 181.71 185.36 189.00 192.63 196.24 199.85 203.44 207.02 2
34、10.59 214.15 217.70 221.24 224.76 228.27 231.77 235.26 238.74 242.20 245.66 249.10 252.53 255.95 259.36 262.76 7 73.53 77.52 81.50 85.46 89.40 93.34 97.26 102.73 106.63 110.51 114.38 118.24 122.09 125.92 129.75 133.56 137.36 141.15 144.93 146.70 152.45 156.19 159.93 163.65 167.35 171.05 174.74 178.4
35、1 182.07 185.72 189.36 192.99 196.60 200.21 203.80 207.38 210.95 214.51 218.05 221.59 225.11 228.62 232.12 235.61 239.09 242.55 246.00 249.45 252.88 256.29 259.70 263.10 7 73.13 77.13 81.10 85.06 89.01 92.95 96.87 103.12 107.02 110.90 114.77 118.62 122.47 126.31 130.13 133.94 137.74 141.53 145.31 14
36、9.07 152.83 156.57 160.30 164.02 167.72 171.42 175.10 178.78 182.44 186.09 189.72 193.35 196.96 200.57 204.16 207.74 211.31 214.86 218.41 221.94 225.46 228.97 232.47 235.96 239.43 242.90 246.35 249.79 253.22 256.64 260.04 263.43 7 72.73 76.73 80.70 84.67 88.62 92.55 96.48 103.51 107.40 111.28 115.15
37、 119.01 122.86 126.69 130.51 134.32 138.12 141.91 145.68 149.45 153.20 156.94 160.67 164.39 168.09 171.79 175.47 179.14 182.80 186.45 190.09 193.71 197.33 200.93 204.52 208.10 211.66 215.22 218.76 222.29 225.81 229.32 232.82 236.31 239.78 243.24 246.69 250.13 253.56 256.98 260.38 263.77 7 72.33 76.3
38、3 80.31 84.27 88.22 92.16 96.09 103.90 107.79 111.67 115.54 119.40 123.24 127.07 130.89 134.70 138.50 142.29 146.06 149.82 153.58 157.31 161.04 164.76 168.46 172.16 175.84 179.51 183.17 186.82 190.45 194.07 197.69 201.29 204.88 208.45 212.02 215.57 219.12 222.65 226.17 229.67 233.17 236.65 240.13 24
39、3.59 247.04 250.48 253.90 257.32 260.72 264.11 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 R 100 R 0 -1.3850 =BS3G148:1981 BSI 12-1999 3 4.10 Accele
40、ration. The sensor, when correctly mounted and with the cable adequately supported, shall withstand without damage an acceleration of17g nin any direction. The sensor shall not break up or become detached under an acceleration of25.5g nin any direction. The supplier shall declare the maximum sensor
41、length up to which this requirement can be met. 4.11 Immersion error. With sensors manufactured to the minimum length it is possible for a significant immersion error to occur arising from the temperature differential between the fluid being measured and the ambient atmosphere. The immersion error s
42、hall be measured using the apparatus described in Appendix A and the error shall be declared. This error shall not exceed0.297 (0.75 C). 4.12 Thermo-electrical effect. The thermale.m.f. produced by the sensor shall be the minimum practical and shall be measured using the apparatus described in Appen
43、dix A. Thee.m.f. value measured shall be declared and shall not exceed20V. 4.13 Temperature/pressure. It is essential to ensure adequate sealing of the cable entry into the sensor. The satisfactory manufacture of this joint will be demonstrated if the sensor operates satisfactorily during temperatur
44、e/pressure test ofBS3G100-2.3.2, appropriate to Equipment GradeV, TestD, Method2. 5 Marking Each unit shall be permanently marked with the following minimum information. a) Model or type number. b) The number of this BritishStandard, i.e.BS3G148 2) . c) Serial number. d) Name of the manufacturer. Ta
45、ble 2 Limits of intrinsic error 2) Marking BS3G148 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as
46、 to the availability of third party certification to support such claims should be addressed to the Director, BritishStandards Institution, Maylands Avenue, Hemel Hempstead, Herts HP24SQ in the case of certification marks administered by BSI or to the appropriate authority for other certification ma
47、rks. Temperature Limits C 70 0 100 200 300 400 450 C 0.65 0.3 0.8 1.3 1.8 2.3 2.55 7 0.25 0.12 0.30 0.40 0.64 0.79 0.86 NOTEThe above permitted errors are calculated from the following. Intrinsic error C=0.3+0.005 |t| where |t| is the modulus of temperature in C without regard to sign.BS3G148:1981 4
48、 BSI 12-1999 Appendix A Apparatus and procedures for immersion error test and thermo-electrical effect test A.1 Apparatus The apparatus (seeFigure 4) consists of a containerwith a base manufactured from an insulating material with a conductivity of not morethan2.5W/(mK). The base shall be approximat
49、ely12mm thick. The sensing end of the sensor under test shall pass through the centre of the base of the container into a steam hypsometer. The hole in the base through which the sensor passes shall be sealed with an “O” ring or similar device to prevent water leakage. The container shall contain divided ice and water to a depth of not less than50mm. A.2 Immersion error test procedure The sensor shall be fitted to the apparatus, without ice and water present, and subjected to stea
