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Warning: The shield wire on the sensor device connected to the input port should not be connected to any V-
terminal. It should be connected to a suitable ground point at one end only. Do not join the shield and ground
input wires at the sensor device. The shield should not be connected to any shield used for isolated
communication. Always refer to the sensor manufacturer for detailed installation guidelines.
Sensor Input 4-20mA Interface
The analog expander allows the connection of self-powered 4-20mA current loop based sensors that output
data based on the current consumption of the sensing device.
The acceptable signal range is from 0-20mA. This is translated by the analog expander into a digital value
which can be used in the programmable functions and variable display in the Protege software. It is also
possible to connect any device which consumes a current between these values (e.g. standard 4-20mA
sensors) and utilize the scaling functions within the Protege system.
The following example shows the connection of a 4-20mA output daylight sensor. This device has a current loop
4-20mA output that represents the current brightness of daylight in lux being detected by the sensor device.
In this example the device has been connected to Input 1 on the analog expander. The wiring is equivalent for all
available analog inputs.
ANALOG EXPANDER
24V+
V-
1i
Warning: The shield wire on the sensor device connected to the input port should not be connected to any V-
terminal. It should be connected to a suitable ground point at one end only. Do not join the shield and ground
input wires at the sensor device. The shield should not be connected to any shield used for isolated
communication. Always refer to the sensor manufacturer for detailed installation guidelines.
PRT-ADC4-DIN | Protege DIN Rail 4 Channel Analog Input Expander | Installation Manual
2i
3i
V-
4i
V-
499R
INSTRUMENTATION QUALITY
BELDON OR AUSTRAL STANDARD
4-20mA OUTPUT DAYLIGHT SENSOR
0-5K / 0-50K LUX DEVICE
V+
Range 0-20 mA
COMPLIANT
V+ = +24VDC
V- = 24VDC GROUND
mA = OUTPUT CURRENT
V-
mA
11
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