Examples; Thermocouples T/C - Intab PC-Logger 2100 User Manual

3.4

Examples

Below follow a few examples of how to connect different sensors and signals to
the "2100".
It is always a good idea, not to say good practise and a sign of competence, to
first draw a schematic diagram of how sensors are to be connected to the PC-
logger and how they may be interconnected. This will save a lot of time by
avoiding common pitfalls like reversed or mixed-up leads, ground loops and
floating signals.

3.4.1 Thermocouples T/C

There are two ways of connecting thermocouples. See examples below. They
differ in the way the signals are referenced to signal gnd.
The two methods can of course be combined.
1) Thermocouple hot junction in contact with conducting object :
2) Thermocouple hot junction in contact with non-conducting object :
3 CONNECTIONS
Connect object to be
measured to PC-Logger
signal ground via a
separate lead. One lead
is enough for all
channels monitoring the
same object: Gnd is
common to all channels.
(Remember?)
Examples: Water
temperature at several
places in a large vessel ;
several thermocouples
along a metal pipe.
To prevent the measured
signal from "floating
away", each sensor "-"
must be jumpered to
signal "Gnd".
Examples: Measuring air
temperature or plastic
container surface
temperature.
Page 13