Previous   |    Close   |    Next

Table AT21. Temperature calibration of T2P. A. Calibration coefficients for data loggers and thermistors. B. Actual thermistor calibration data.

Table AT21A. Calibration coefficients. (See table notes.)

Calibration
coefficient		 Logger Sn 2 Logger Sn 4
R1 1.000729 0.990307767
R2 176.136606 –72.74909712

Calibration
coefficient		 Thermistor
0509-1		 Thermistor
0509-2		 Thermistor
0509-3		 Thermistor
0509-4		 Thermistor
0509-5		 Thermistor
0509-6
A 4.63276461E–04 5.43051013E–04 4.75887900E–04 4.82495572E–04 4.82688206E–04 4.71824656E–04
B 2.10947147E–04 1.99981837E–04 2.08557612E–04 2.09282474E–04 2.08833095E–04 2.09263995E–04
C 6.19690000E–08 8.35910000E–08 6.34430000E–08 6.20870000E–08 6.40080000E–08 6.27480000E–08

Notes: For temperature channel calibration (counts to ohms), Rt′ = R1 × [5/(x/65535 × 3.5/24900) – 24900] + R2, where x = counts and Rt′ = thermistor resistance in ohms. For thermistor calibration (ohms to Kelvin [Steinhart and Hart]), 1/t = A + B × Ln(Rt′) + C × Ln(Rt′)3, where t (°C) = K – 273.15 and Rt′ = thermistor resistance in ohms.

Table AT21B. Temperature vs. resistance.

Serial # Resistance (Ω)
0.000°C 30.000°C 60.000°C 100.000°C
0509-1 1795000 406620 116210 28980
0509-2 1720000 389890 114500 27795
0509-3 1740000 394200 112590 28035
0509-4 1651000 373340 106560 26535
0509-5 1655000 375720 107480 26810
0509-6 1712000 388430 111130 27740

Previous   |    Close   |    Next   |    Top of page