Why consider signal conditioning for your thermocouples and temperature sensors?

Thermocouples ... how to use thermocouples and why signal conditioning is important.
In our application note Introduction to Thermocouples, we explore the history of the thermocouple from its origins in the 1820s right up to its modern usage today! In a short 3 pages, we present why thermocouples work the way they do, why you need signal conditioners to provide a high input impedance circuit to measure a thermocouple's voltage, how and why to provide 'cold junction compensation', and a description of linearization as well as other important measurement requirements. Part 1 is a quick summary of over 170 years of thermocouple temperature measurement technology!

In our application note, Temperature Measurements, we look at some modern thermocouple specs. For example, you will see how linearity is effected by TC metallurgy, how mathematical models are used to plot response characteristics, how cold-junction-compensation is applied, and why linearization performed in the signal conditioner can be the best solution! Also, we provide an excellent checklist of 15 "reminders" to use on your next thermocouple application!

Signal Conditioning - Why and How ... explores a few often overlooked reasons to use signal conditioning modules.

"Why Isolate"... exposes very real, and very different reasons to isolate every one of your analog signals!

SensorLex™ 8B Isolated Analog Signal Conditioners

8B34 Linearized 2- or 3-Wire RTD Input Modules
8B35 Linearized 4-Wire RTD Input Modules
8B37 Thermocouple Input Modules
8B47 Linearized Thermocouple Input Modules

SCM5B Isolated Analog Signal Conditioning Products

Each SCM5B47 thermocouple signal conditioning module provides a single channel of thermocouple input which is filtered, isolated, amplified, linearized and converted to a high level analog voltage output. This voltage output is logic-switch controlled, allowing these modules to share a common analog bus without the requirement of external multiplexes.

The SCM5B modules are designed with a completely isolated computer side circuit, which can be floated to ±50V from Power Common, pin 16. This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin, to I/O Common, pin 19.

SCM5B34 Linearized 2- or 3-Wire RTD Input Modules
SCM5B35 Linearized 4-Wire RTD Input Modules
SCM5B37 Thermocouple Input Modules
SCM5B47 Linearized Thermocouple Input Modules

DSCA High Performance DIN Isolated Analog Signal Conditioners

DSCA34 Linearized 2- or 3-Wire RTD Input Signal Conditioners
DSCA37 Thermocouple Input Signal Conditioners
DSCA47 Linearized Thermocouple Input Signal Conditioners

SCM7B Isolated Process Control Signal Conditioning Products

SCM7B35 Isolated 2-Wire Transmitter Interface Modules With Loop Power
SCM7B37 Isolated Thermocouple Input Modules
SCM7B47 Isolated Linearized Thermocouple Input Modules