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SmartReader Data Logger
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Figure C-6: Choosing an R25 Value
Resistance Curves
Always request the Resistance-Temperature data of the thermistors you obtain. If you are
getting "interchangeable" sensors, this data will make initial calibration very easy.
1.15.10 Probe Assemblies
Because unprotected thermistors are poorly suited to most temperature measurements, they
must be mounted in some type of probe assembly.
A probe may simply be a thermistor on the end of a cable protected by a special potting
compound, or a drilled-out bolt for installation into a tapped hole or pipe well. An ET Series
Temperature Probe is simply a thermistor attached to the end of a length of high-temperature
cable, then mounted, with special potting, into the end of a short length of stainless steel
tubing. Endless possibilities exist. Many thermistor manufacturers offer custom probe
assemblies to fit specific applications. Thermistor distributors such as Omega® usually have
standard thermistor probe assemblies.
When making a probe, the thermistor should be soldered to a length of wire or cable and
inserted into the probe, generally with epoxy in the probe tip to give mechanical strength and to
create better thermal contact with the probe. Additional epoxy is used to seal the back end.
Make sure not to get any air bubbles into the probe or the pressure resulting from high
temperature monitoring may destroy the potting.
Types of Cables
Thermistors require 2-conductor cables. There are no limitations here as to which cable you
can use as long as the environment you intend to use the probes in will not exceed the specific
temperature ratings of the cable itself. A good cable to use is 22-gauge stranded with
high-temperature Teflon® or Kynar™ insulated leads.
Shielded cable is not usually required unless the sensors will be used in an environment with
high electromagnetic interference (EMI). Then we suggest running the sensors in a metal
sheath or conduit that is grounded to a suitable point outside the area of EMI. The sheath
should extend entirely over the end of the thermistor. If shielded cable is used, then the shield
should be grounded to the Common connection directly on your data logger.
Cable Lengths
The high resistivity of thermistors affords them a distinct measurement advantage over other
methods when using long lengths of cable. For example, a thermistor probe that has a typical
value of 10k ohms at 25°C will change its resistance about 4% per degree C. Even with 30m
- 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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