3.3.3 THERMOCOUPLE INPUTS
Thermocouples are simply connected to the
millivolt input as shown opposite. The cold
junction compensation is performed by the
integral sensor at the rear of the unit or by a
programmable cold junction value. For best
accuracy, it is important that the rear plate is
fitted to prevent draughts causing
temperature differences between the cold
junction sensor and the thermocouple
connection with the device.
3.3.4 Pt100 RESISTANCE TEMPERATURE
DETECTORS ( RTDs )
These detectors are for platinum
resistance inputs (Pt100) to BS1904 or
DIN 43760 three wire. RTDs should be
connected using three identical wires in
order that measurement errors due to lead
wire resistances can be eliminated. The
connections should be made as shown in
the diagram opposite.
If it is necessary to use a two wire
sensor, then it should be connected
across pins 2 and 4, with a link added
between pins 4 and 5. It must be noted,
however, that this configuration will suffer
from inaccuracies due to the total series
resistance of the wiring.
SENSOR
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