Atest Gaz Alpa EcoWent XT, User Manual

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6.3 Closed alarm loop
This system is different from the previous one in terms of connection of the end of the supply and signal
line back to the control unit of the loop equipped with a test output (e.g. Alpa MOD LED1 Control Unit). In
this way, it is possible to improve the power supply conditions of the sensor and resistance to damage. In
this system it is also possible to check the loop continuity and the regularity of the system operation by
enforcing the alarm at the "test output of the loop" in the control unit. This makes it easier to carry out
periodic checks of the system.
Figure 6: Connection with the Alpa MOD LED1 control unit into a closed bus system
A detailed diagram is shown in Appendix [3].
6.4 Other architectures
It is also possible to use modification of the described architectures. For example, by connecting several bus
systems to single inputs of the control unit, it is possible to create a system composed of several
independent zones using only one control unit. However, it is necessary to remember that it may be
possible to supply the bus systems from additional power sources that will provide adequate current
capacity of the system.
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User Manual: POD-042-ENG R04