13: Extension - ABB Arc Guard System TVOC-2 Installation And Maintenance Manual

Arc Monitor functions

13: Extension

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The extension module is used to expand the system from the original 10
sensors with additional sensors. One extension can hold up to 10 sensors.
The Arc Monitor can hold up to 2 extensions making it possible to mount up
to 30 detectors.The standard extension is used for detector up to 30 meter
length.
Note!
A separate version of the extension module is available which is intended
only for 60 meter detectors.