Ranges And Their Resolution; Temperature Measurements - T/C:s - Intab PC-Logger 3100i How To Use Manual

5.3 Ranges and their Resolution

An "3100i" is especially suited for monitoring process type signals and still
has the very sensitive 50mV range available.
The ranges and their resolutions are:
RANGE
+/- 10V
+/- 1000mV
+/- 100mV
+/- 50mV
An input set to the 50mV range can measure temperature with a resolution of
0.1°C using T/C:s type K. The temperature range will in this case be -100 to
+1200 °C.
Each channel has a shunt resistor that is connected across the input via a
switch on the analogue board adjacent to the screw terminals. This resistor has
to be switched in manually when current measurements are to be taken (see
6.3.2.).
Range here is 0 - 20mA which resolves the signal to 6µA.
Note that 4 - 20mA signals are beautifully transformed into correct magnitude
and unit by the "transform" function of the software.
NOTE that the shunt resistor will overheat if subjected to more than
80mA.

5.4 Temperature measurements - T/C:s

The "3100i" is specially adapted for temperature measuring using
thermocouples.
Thermocouples are active sensors that don't require powering to supply a
signal. They are non-linear but are linearized by the "3100i".
A thermocouple is in its simplest form a pair of wires of dissimilar materials
that are soldered together at one end. The other end is connected to the two
screw terminals of a channel. The difference in temperature between the
soldered end and the screw terminals gives rise to a voltage that can be
measured.
This voltage is different for different thermocouple materials so tell the
software which type(s) you are using!
RESOLUTION
0.4 mV
40µV
4µV
2µV
BASIC UNIT
13