Connecting two-wire sensors 4 ÷ 20 mA to CP-1005

The following figure shows the connection of two current sensors 4 to 20 mA in a two-wire version. In the same way up to six sensors can be connected to one CP-1005 module. The 24 V power supply can be a separate device, or a common power supply can be used for powering of both the CP-1005 and the current loops with measured sensors.

An example of connecting current sensors with an active output (with separate power supply) is shown in Chapter 11.3.9 and RH for HVAC applications, a sensor with 4 to 20mA output.

Fig..1 An example of the basic module CP-1005 current inputs connection (a connection of two-wire 4 ÷ 20 mA sensors)

Notes

1. The CP-1005 module input is fitted with an internal sensing resistor 100 Ω, which also defines the internal input resistance for current ranges. The resistor is connected to the module terminals electronically (unlike the older version of the CP-1005 with fixed terminals, where it was connected by jumpers). When the CP-1005 is turned off, or the relevant input is not configured for the current range, the resistor is disconnected and the input has a high internal resistance – which results in disconnecting the loop!