24-1
Chapter 24: Thermocouple Input Module
Chapter 24: Thermocouple Input module
(discontinued)
INTRODUCTION
The SCADA 3000 Thermocouple Input Module is an optional component for use with the
SCADA 3000 system. The module features four thermocouple inputs that can be indepen-
dently configured to accept type E, J, K, T, R, or S thermocouples. The module also features a
microprocessor watchdog circuit to maintain system reliability. LED indicators are provided to
show system power and module operation via a blinking pulse LED.
What is a thermocouple?
A thermocouple is a temperature measurement sensor, consisting of two dissimilar metals
joined together (coupled) at one end (a junction), that produces a small thermoelectric voltage
when the junction is heated. The change in thermoelectric voltage is measured by the mod-
ule and is converted to a temperature reading. Thermocouples are used in industry because of
their wide temperature range and low cost. Typically, they are used to measure temperatures
of industrial processes that are either very hot (100° to 1600° C) or very cold (0° to -270°C).
When using thermocouples it is critically important to use proper wiring techniques because
the voltage generated by the thermocouple is extremely small (6-52µV per degree C).
INSTALLATION
This chapter provides information necessary to install the Thermocouple Input Module.
Correctly installing the unit will ensure proper functioning and maximum service life. Please
read the entire chapter before attempting installation.
OPeRATING eNVIRONmeNT
The Thermocouple Input Module should be mounted and operated in a clean, dry and safe
environment. Do not mount the unit where it will be subject to shock and vibration. Do not
mount the unit where it will be subject to dirt, dust or moisture. Ideally the unit would be
mounted in a steel or a fiberglass NEMA-4 enclosure. Do not mount the unit or the expan-
sion modules close to motor starters, contactors or relays that switch inductive loads. These
devices generate large electromagnetic fields that can cause the Thermocouple Input Module
to malfunction. Where this is unavoidable, mount the module(s) and main unit in a separate,
grounded, steel enclosure. This will shield them from harmful electrical interference.
The temperature range the Thermocouple Input Module can operate in is 32°F to 158°F (0°C
to 70°C). If you require Thermocouple Input Module to operate in a below freezing environ-
ment, you must take safe and practical measures to keep the module’s temperature above 32°F
or it will not operate reliably.
CAUTION
: The Thermocouple Input Module is a sensitive electronic device.
Personnel and work area should be grounded before handling this device. Do
not install a SCADA 3000 system near any strong electrostatic, electromagnetic,
magnetic or radioactive fields. Do not expose it to fumes or corrosive vapors.
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