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INTRODUCTION AND SPECIFICATIONS
Specifications
1
06_03 TCM-39032 3
CHAPTER 1
5. Temperature control range depends primarily on the type of thermistor and TE module used. The range can be extended higher and
lower by selecting the appropriate components. See Appendix B for more details.
6. Accuracy figures quoted are typical for a 10 Kohm thermistor; accuracy figures are relative to calibration standard. Both resolution
and accuracy are dependent on the user defined configuration of the instrument.
7. Accuracy depends on the sensor model selected; both resolution and accuracy are dependent on the user defined configuration of
the instrument; RTD operation requires TSC-595 option.
8. Over any 1 hour period, half-scale output; short term temperature stability is a strong function of the thermal environment of the
thermistor and TE module. Room air currents in particular can easily cause fluctuations of 0.1
o
C in an exposed mounting
configuration.
9. Over any 24 hour period, half-scale output
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Usable Thermistor Range 25 Ω to 450 kΩ, typical
LM335 Voltage V (25
o
C) = 2980 mW; V
T
= 10 mV /
o
K
over rated sensor range
LM335 Bias 1 mA
AD590 Current I (25
o
C) = 298.2 µA; I
T
= 1 µA /
o
K
over rated sensor range
AD590 Bias + 8 VDC
RTD (PT100) Resistance R (25
o
C) = 109.73 ohms, typical
Thermistor Sensing Current 10 µA or 100 µA (user selectable)
Temperature Calculation Methods AD590 or LM335 calibrated with two-point method;
thermistors are calibrated by storing three constants of
the Steinhart-Hart equation in internal non-volatile
memory
Thermistor
LM335
AD590
RTD
1 / T = (C1 * 10
-3
) + (C2 * 10
-4
)(In R)
+ (C3 * 10
-7
)(In R)
3
; (T in Kelvin)
T = C1 + C2 * (V / 10 mV /
o
K) - 273.15
T = C1 + C2 * (I / (1 µA /
o
K) -273.15
T = C1 + C2 * (R - 100) * 2.5