Chapter 9 Specifications 99
Temperature Sensors Thermistor AD590 LM335 RTD (100
Ω
ΩΩ
Ω
)
5
Temp Control Resolution 0.01 °C 0.01 °C 0.01 °C 0.01 °C
Temp Control Accuracy ± 0.05 °C ± 0.05 °C ± 0.05 °C ± 0.05 °C
Sensor Bias Current or Voltage 10 µA/100 µA +5 Volts 1 mA 1 mA
Temperature Calibration
Thermistor 1/T = (C1 x 10
-3
) + (C2 x 10
-4
)(ln R) + (C3 x 10
-7
)(ln R)
3
AD590 T = C1 + C2 x (I
AD590
/1µA/K - 273.15)
LM335 T = C1 + C2 x (V
LM335
/10mV/K - 273.15)
Pt RTD Rt = Ro [ 1 + C1t + C2t
2
] ; t
≥
0 °C,
Rt = Ro [ 1 + C1t + C2t
2
+ C3t
3
(t - 100)] ; t < 0 °C
Ro = resistance at 0 °C, where Ro=100
Ω
for a 100
Ω
Pt RTD.
5
Accuracy is with lead wire resistance calibrated out.
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