Geokon GeoNet 8900 Series, Instruction Manual

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MODEL 8900 SERIES GEONET WIRELESS DATA HOSTING SYSTEM | THERMISTOR TEMPERATURE DERIVATION | 29
APPENDIX C. THERMISTOR TEMPERATURE
DERIVATION
C.1 3KΩ THERMISTOR RESISTANCE
Thermistor Types:
■
YSI 44005, Dale #1C3001–B3, Alpha #13A3001–B3
■
Honeywell 192–302LET–A01
Resistance to Temperature Equation:
EQUATION 1: 3kΩ Thermistor Resistance
Where:
T = Temperature in °C
LnR
= Natural Log of Thermistor Resistance
A
= 1.4051 x 10
–3
B = 2.369 x 10
–4
C = 1.019 x 10
–7
Note: Coefficients calculated over the –50 to +150

C span.
17:
TABLE 17: 3KΩ Thermistor Resistance
T =
1
–
273.15
A+B(LnR)+C(LnR
3
)
Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp
201.1K -50 15.72K -9 2221 32 474.7 73 137.2 114
187.3K -49 14.90K -8 2130 33 459.0 74 133.6 115
174.5K -48 14.12K -7 2042 34 444.0 75 130.0 116
162.7K -47 13.39K -6 1959 35 429.5 76 126.5 117
151.7K -46 12.70K -5 1880 36 415.6 77 123.2 118
141.6K -45 12.05K -4 1805 37 402.2 78 119.9 119
132.2K -44 11.44K -3 1733 38 389.3 79 116.8 120
123.5K -43 10.86K -2 1664 39 376.9 80 113.8 121
115.4K -42 10.31K -1 1598 40 364.9 81 110.8 122
107.9K -41 9796 0 1535 41 353.4 82 107.9 123
101.0K -40 9310 1 1475 42 342.2 83 105.2 124
94.48K -39 8851 2 1418 43 331.5 84 102.5 125
88.46K -38 8417 3 1363 44 321.2 85 99.9 126
82.87K -37 8006 4 1310 45 311.3 86 97.3 127
77.66K -36 7618 5 1260 46 301.7 87 94.9 128
72.81K -35 7252 6 1212 47 292.4 88 92.5 129
68.30K -34 6905 7 1167 48 283.5 89 90.2 130
64.09K -33 6576 8 1123 49 274.9 90 87.9 131
60.17K -32 6265 9 1081 50 266.6 91 85.7 132
56.51K -31 5971 10 1040 51 258.6 92 83.6 133
53.10K -30 5692 11 1002 52 250.9 93 81.6 134
49.91K -29 5427 12 965.0 53 243.4 94 79.6 135
46.94K -28 5177 13 929.6 54 236.2 95 77.6 136
44.16K -27 4939 14 895.8 55 229.3 96 75.8 137
41.56K -26 4714 15 863.3 56 222.6 97 73.9 138
39.13K -25 4500 16 832.2 57 216.1 98 72.2 139
36.86K -24 4297 17 802.3 58 209.8 99 70.4 140
34.73K -23 4105 18 773.7 59 203.8 100 68.8 141
32.74K -22 3922 19 746.3 60 197.9 101 67.1 142
30.87K -21 3748 20 719.9 61 192.2 102 65.5 143
29.13K -20 3583 21 694.7 62 186.8 103 64.0 144
27.49K -19 3426 22 670.4 63 181.5 104 62.5 145
25.95K -18 3277 23 647.1 64 176.4 105 61.1 146
24.51K -17 3135 24 624.7 65 171.4 106 59.6 147
23.16K -16 3000 25 603.3 66 166.7 107 58.3 148
21.89K -15 2872 26 582.6 67 162.0 108 56.8 149
20.70K -14 2750 27 562.8 68 157.6 109 55.6 150
19.58K -13 2633 28 543.7 69 153.2 110
18.52K -12 2523 29 525.4 70 149.0 111
17.53K -11 2417 30 507.8 71 145.0 112
16.60K -10 2317 31 490.9 72 141.1 113