Pt100热电阻计算公式及分度表
热电阻公式都是Rt=Ro(1+A*t+B*t*t);Rt=Ro[1+A*t+B*t*t+C(t-100)*t*t*t] 的形式,t表示摄氏温度,Ro是零摄氏度时的电阻值,A、B、C都是规定的系数,对于Pt100,Ro就等于100,
0到850度
Rt=R0(1+A*t+B*t^2) -200到0
Rt=R0[1+A*t+Bt^2+C(t-100)^3] R0是0度是铂电阻的阻值 A=3.940*乘10负3次幂
B=-5.802乘10负7次幂
C=-4.274乘10的负12
Pt100,就是说它的阻值在0度时为100欧姆,负200度时为18.52欧姆,200度时为175.86欧姆,800度时为375.70欧姆。
Pt100温度传感器的主要技术参数如下:测量范围:-200℃~+850℃;允许偏差值△℃:A级±(0.15+0.002│t│), B级±(0.30+0.005│t│);热响应时间<30s;最小置入深度:热电阻的最小置入深度≥200mm;允通电流≤5mA。另外,Pt100温度传感器还具有抗振动、稳定性好、准确度高、耐高压等优点。
看到了?电流不能大于5mA,而电阻是随温度变化的,所以电压也要注意。
为了提高温度测量的准确性,应使用1V电桥电源、A/D转换器的5V参考电源要稳定在1mV级;在价格允许的情况下,Pt100传感器、A/D转换器和运放的线性度要高。同时,利用软件矫正其误差,可以使测得温度的精度在±0.2℃。
Pt100热电阻分度表
温度 ℃ -200 -190 -180 -170 -160 -150 18.52 22.83 27.10 31.34 35.54 39.72 22.40 26.67 30.91 35.12 39.31 21.97 26.24 30.49 34.70 38.89 21.54 25.82 30.07 34.28 38.47 21.11 25.39 29.64 33.86 38.05 20.68 24.97 29.22 33.44 37.64 20.25 24.54 28.80 33.02 37.22 19.82 24.11 28.37 32.60 36.80 19.38 23.68 27.95 32.18 36.38 18.95 23.25 27.52 31.76 35.96 0 1 2 3 4 5 6 7 8 9 电阻值(Ω)
-140 -130 -120 -110 -100 -90 -80 -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 43.88 48.00 52.11 56.19 60.26 64.30 68.33 72.33 76.33 80.31 84.27 88.22 92.16 96.09 100.00 100.00 103.90 107.79 111.67 115.54 119.40 123.24 127.08 130.90 134.71 138.51 142.29 146.07 149.83 153.58 157.33 161.05 164.77 168.48 172.17 175.86 179.53 183.19 186.84 190.47 194.10 197.71 201.31 43.46 47.59 51.70 55.79 59.85 63.90 67.92 71.93 75.93 79.91 83.87 87.83 91.77 95.69 99.61 100.39 104.29 108.18 112.06 115.93 119.78 123.63 127.46 131.28 135.09 138.88 142.67 146.44 150.21 153.96 157.70 161.43 165.14 168.85 172.54 176.22 179.89 183.55 187.20 190.84 194.46 198.07 201.67 43.05 47.18 51.29 55.38 59.44 63.49 67.52 71.53 75.53 79.51 83.48 87.43 91.37 95.30 99.22 100.78 104.68 108.57 112.45 116.31 120.17 124.01 127.84 131.66 135.47 139.26 143.05 146.82 150.58 154.33 158.07 161.80 165.51 169.22 172.91 176.59 180.26 183.92 187.56 191.20 194.82 198.43 202.03 42.63 46.77 50.88 54.97 59.04 63.09 67.12 71.13 75.13 79.11 83.08 87.04 90.98 94.91 98.83 101.17 105.07 108.96 112.83 116.70 120.55 124.39 128.22 132.04 135.85 139.64 143.43 147.20 150.96 154.71 158.45 162.17 165.89 169.59 173.28 176.96 180.63 184.28 187.93 191.56 195.18 198.79 202.39 42.22 46.36 50.47 54.56 58.63 62.68 66.72 70.73 74.73 78.72 82.69 86.64 90.59 94.52 98.44 41.80 45.94 50.06 54.15 58.23 62.28 66.31 70.33 74.33 78.32 82.29 86.25 90.19 94.12 98.04 41.39 45.53 49.65 53.75 57.82 61.88 65.91 69.93 73.93 77.92 81.89 85.85 89.80 93.73 97.65 40.97 45.12 49.24 53.34 57.41 61.47 65.51 69.53 73.53 77.52 81.50 85.46 89.40 93.34 97.26 40.56 44.70 48.83 52.93 57.01 61.07 65.11 69.13 73.13 77.12 81.10 85.06 89.01 92.95 96.87 40.14 44.29 48.42 52.52 56.60 60.66 64.70 68.73 72.73 76.73 80.70 84.67 88.62 92.55 96.48 101.56 101.95 102.34 102.73 103.12 103.51 105.46 105.85 106.24 106.63 107.02 107.40 109.35 109.73 110.12 110.51 110.90 111.29 113.22 113.61 114.00 114.38 114.77 115.15 117.08 117.47 117.86 118.24 118.63 119.01 120.94 121.32 121.71 122.09 122.47 122.86 124.78 125.16 125.54 125.93 126.31 126.69 128.61 128.99 129.37 129.75 130.13 130.52 132.42 132.80 133.18 133.57 133.95 134.33 136.23 136.61 136.99 137.37 137.75 138.13 140.02 140.40 140.78 141.16 141.54 141.91 143.80 144.18 144.56 144.94 145.31 145.69 147.57 147.95 148.33 148.70 149.08 149.46 151.33 151.71 152.08 152.46 152.83 153.21 155.08 155.46 155.83 156.20 156.58 156.95 158.82 159.19 159.56 159.94 160.31 160.68 162.54 162.91 163.29 163.66 164.03 164.40 166.26 166.63 167.00 167.37 167.74 168.11 169.96 170.33 170.70 171.07 171.43 171.80 173.65 174.02 174.38 174.75 175.12 175.49 177.33 177.69 178.06 178.43 178.79 179.16 180.99 181.36 181.72 182.09 182.46 182.82 184.65 185.01 185.38 185.74 186.11 186.47 188.29 188.66 189.02 189.38 189.75 190.11 191.92 192.29 192.65 193.01 193.37 193.74 195.55 195.91 196.27 196.63 196.99 197.35 199.15 199.51 199.87 200.23 200.59 200.95 202.75 203.11 203.47 203.83 204.19 204.55
280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 600 610 620 630 640 650 660 204.90 208.48 212.05 215.61 219.15 222.68 226.21 229.72 233.21 236.70 240.18 243.64 247.09 250.53 253.96 257.38 260.78 264.18 267.56 270.93 274.29 277.64 280.98 284.30 287.62 290.92 294.21 297.49 300.75 304.01 307.25 310.49 313.71 316.92 320.12 323.30 326.48 329.64 332.79 205.26 208.84 212.41 215.96 219.51 223.04 226.56 230.07 233.56 237.05 240.52 243.99 247.44 250.88 254.30 257.72 261.12 264.52 267.90 271.27 274.63 277.98 281.31 284.63 287.95 291.25 294.54 297.81 301.08 304.34 307.58 310.81 314.03 317.24 320.43 323.62 326.79 329.96 205.62 209.20 212.76 216.32 219.86 223.39 226.91 230.42 233.91 237.40 240.87 244.33 247.78 251.22 254.65 258.06 261.46 264.86 268.24 271.61 274.96 278.31 281.64 284.97 288.28 291.58 294.86 298.14 301.41 304.66 307.90 311.13 314.35 317.56 320.75 323.94 327.11 330.27 205.98 209.56 213.12 216.67 220.21 223.74 227.26 230.77 234.26 237.74 241.22 244.68 248.13 251.56 254.99 258.40 261.80 265.20 268.57 271.94 275.30 278.64 281.98 285.30 288.61 291.91 295.19 298.47 301.73 304.98 308.23 311.45 314.67 317.88 321.07 324.26 327.43 330.59 206.34 206.70 207.05 207.41 207.77 208.13 209.91 210.27 210.63 210.98 211.34 211.70 213.48 213.83 214.19 214.54 214.90 215.25 217.03 217.38 217.74 218.09 218.44 218.80 220.57 220.92 221.27 221.63 221.98 222.33 224.09 224.45 224.80 225.15 225.50 225.85 227.61 227.96 228.31 228.66 229.02 229.37 231.12 231.47 231.82 232.17 232.52 232.87 234.61 234.96 235.31 235.66 236.00 236.35 238.09 238.44 238.79 239.13 239.48 239.83 241.56 241.91 242.26 242.60 242.95 243.29 245.02 245.37 245.71 246.06 246.40 246.75 248.47 248.81 249.16 249.50 245.85 250.19 251.91 252.25 252.59 252.93 253.28 253.62 255.33 255.67 256.01 256.35 256.70 257.04 258.74 259.08 259.42 259.76 260.10 260.44 262.14 262.48 262.82 263.16 263.50 263.84 265.53 265.87 266.21 266.55 266.89 267.22 268.91 269.25 269.59 269.92 270.26 270.60 272.28 272.61 272.95 273.29 273.62 273.96 275.63 275.97 276.30 276.64 276.97 277.31 278.98 279.31 279.64 279.98 280.31 280.64 282.31 282.64 282.97 283.31 283.64 283.97 285.63 285.96 286.29 286.62 286.85 287.29 288.94 289.27 289.60 289.93 290.26 290.59 292.24 292.56 292.89 293.22 293.55 293.88 295.52 295.85 296.18 296.50 296.83 297.16 298.80 299.12 299.45 299.78 300.10 300.43 302.06 302.38 302.71 303.03 303.36 303.69 305.31 305.63 305.96 306.28 306.61 306.93 308.55 308.87 309.20 309.52 309.84 310.16 311.78 312.10 312.42 312.74 313.06 313.39 314.99 315.31 315.64 315.96 316.28 316.60 318.20 318.52 318.84 319.16 319.48 319.80 321.39 321.71 322.03 322.35 322.67 322.98 324.57 324.89 325.21 325.53 325.84 326.16 327.74 328.06 328.38 328.69 329.01 329.32 330.90 331.22 331.53 331.85 332.16 332.48