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Calibrating Thermistors) and each one must be associated with a particular unique equation.
Note that non-interchangeable thermistors are specified with a tolerance applicable at a single
reference point only.
NTC and PTC
By far the most common types of thermistors have a negative temperature coefficient (NTC).
These are the types that you should obtain for accurate temperature sensing. Positive
Temperature Coefficient (PTC) thermistors are not applicable for use with SmartReader data
loggers.
Linear Thermistors
Linear thermistors are actually two or more separate thermistors, combined together, for use
with a resistor set. The result is a "thermistor" with a response curve that approaches a
straight line. Because TrendReader software can accurately linearize the thermistor curve
using the Steinhart-Hart equation, linear thermistors are not necessary, nor applicable, for use
with SmartReader data loggers.
Resistance at 25°C
One of the main considerations when choosing a thermistor is its resistance characteristics.
Selecting the right one will help you maximize the resolution and accuracy of your
SmartReader data logger measurements.
Your goal here should be to choose a thermistor that has a resistance of approximately 10k
ohms at the midpoint of the temperature range in which you want to monitor. The graph in
Figure C-5 shows how the temperature resolution from your loggers changes at different
resistance values. From the graph you can see that the best resolution occurs at 10k ohms.
A good indicator of this is the thermistor's R25 rating which is a standard value identifying its
resistance measured at 25°C. To decide which R25 value is best for your applications first
determine the midpoint of the temperature range you want to monitor. Then refer to Figure
C-6 which shows the best R25 values for different temperature midpoints.
If you wish to measure temperature centered on the boiling point of water (100°C), for
example, the best thermistor to use would have a resistance of approximately 300k ohms at
25°C (and thus approximately 10k ohms at 100°C).
Figure C-5: Thermistor Resolution Chart
- IMPORTANT! 1
- SmartReader Data Loggers 2
- TRADEMARK NOTICES 3
- LIMITED WARRANTY 4
- Table of Contents 5
- 1.1.1 Features 9
- 1.1.2 Description 10
- 1.1.3 Programmed Operation 10
- 1.1.5 How to Use SmartReaders 11
- 1.1.6 Specifications 13
- 1.1.7 Approvals 14
- SmartReader Software Driver 15
- 1.2.1 Logger Status 16
- 1.2.2 Logger Channels 18
- 1.2.2.2 Channel Calibration 20
- 1.3.1 Description 21
- 1.3.2 Setup 21
- Other Applications 22
- 1.4.1 Description 23
- 1.4.2 Setup 23
- 1.4.3 Accessories 24
- 1.4.4 Troubleshooting 25
- 1.4.6 Specifications 26
- 1.5.1 Description 28
- 1.5.2 Setup and Use 29
- A60FL / A65FL 29
- A70FL / A75FL 30
- 1.5.4 Specifications 31
- 1.5.5 Troubleshooting 31
- 1.6.1 Description 32
- 1.6.2 Setup 33
- 1.6.3 Pressure Calibration 34
- 1.6.4 Specifications 35
- 1.7.1 Description 37
- 1.7.2 Setup and Use 37
- 1.7.3 Specifications 38
- 1.7.4 Calibration 39
- 1.8.1 Description 41
- 1.8.2 Setup and Use 41
- 1.8.3 Specifications 42
- 1.8.4 Calibration 43
- 1.9.1 Description 45
- 1.9.2 Setup 45
- 1.9.3 Choosing Input Channels 48
- R = 200 / Iin 52
- 1.9.7 Specifications 59
- 1.9.8 Applications 60
- 1.10.1 Description 62
- 1.10.2 Setup and Use 62
- SmartReader 9 Pulse Logger 64
- 1.11.3 Quick-Start Tutorial 65
- 1.11.7 Specifications 69
- 1.12.1 Description 70
- 1.12.2 Setup 70
- 1.12.3 Accessories 71
- 1.12.4 Troubleshooting 72
- 1.12.6 Specifications 73
- Monitoring Resistance 75
- Temperature and 77
- Relative Humidity 77
- Calibration 77
- L" reading 79
- H" reading 79
- L - 170 x bH) / 428 79
- H - bL) - 1) 79
- L - 145 x bH) / 296 81
- Thermistor Temperature 82
- 1.15.4 Setup and Use 83
- 1.15.5 Specifications 84
- SmartReader Data Logger 89
- 1.15.7 Custom Probes 92
- 1.15.10 Probe Assemblies 95
- Sample Rates 97
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