Instruction for use • Switch unit AGS 80 D
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5.2. AGS D Monitor
5.2.1 Functionality
5.2.1.1 General information
The control unit AGS-D is used for automatic switching in a gas switching unit for medical gas
supply. The mains pressure is kept by automatic switching between a main source and two
auxiliary sources. The control unit makes sure that the corresponding gas is permanently
supplied. Pressures of the main source and of the auxiliary sources as well as system and mains
pressures are constantly monitored. Channel control is carried out by pressure transmitters (4-
20mA).
Each pressure has been assigned to a (multi-coloured) LED. These LEDs either show the normal
condition (green) or a state of alarm (yellow or red for mains pressure). The QUIT key allows the
user to suppress the acoustic alarm. With an alarm of the mains pressure, the acoustic signal is
repeated after 12 minutes.
The LCD displays the sources, the alarm thresholds and the current pressure. In addition, the
sequence of sources, which is relevant for switching, is displayed in Roman numerals. The
currently active source is shown by inverting the source designation. In the lower area, the state
of the corresponding pressure is displayed in text form (i.e. OK, HIGH, LOW).
