West Control Solutions Pro-EC44 - Manual (Page 25)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 18
Universal Input 2 Connections
– PT100 / NI120 (RTD) input
The optional 2
nd
universal input, supports two types of RTD. PT100 (platinum sensor, 100Ω
at 0°C). For three wire RTDs, connect the resistive leg and the common legs of the RTD as
illustrated. For a two wire RTD a wire link should be fitted across terminals 35 & 36 (in place
of the third wire). Two wire RTDs should only be used when the leads are less than 3 metres
long. If possible, avoid cable joints.
Figure 15. Input 2 - RTD Connections
Four wire RTDs can be used, provided that the fourth wire is left unconnected. This wire
should be cut short or tied back so that it cannot contact any of the terminals on the rear of
the instrument.
Universal / Auxiliary Input 2 Connections - Linear Volt, mV or mA input
The optional auxiliary or 2
nd
universal input supports the following linear/analogue signals: 0
to 50mV; 10 to 50mV; 0 to 5V; 1 to 5V; 0 to 10V; 2 to 10V; 0 to 20mV; 4 to 20mA from any
suitable source. Voltage & millivolt signals are connected to terminals 2 & 3, milliamp signals
are connected to 1 & 3. Carefully observe the polarity of the connections.
Figure 16. Input 2 - DC Volt, mV & mA Connections
Universal / Auxiliary Input 2 Connections
– Potentiometer
The optional auxiliary or 2
nd
universal input, the terminals detailed below can be used to
connect a feedback potentiometer. Minimum potentiometer resistance is
≥100Ω.
Figure 17. Input 2 - Potentiometer Connections