SERVO-i Alarm Output Connector Rev 03

External alarm system design

• The Alarm output connector enables connection of an external alarm signal system to the Servo Ventilator System. High and medium priority alarms are transferred, and the alarm output signal is active as long as the audio alarm is active on the ventilator.

As the personnel consciously or unconsciously tend to trust an external alarm system, it is important to design the system so that the possibility for undetected failures is reduced to a minimum, i.e. a single fault shall not inhibit the function of the system.

• The Alarm output connector has two contact functions: NO (Normally Open) and NC (Normally Closed). In an alarm situation the open contact will close and the closed one will open. The contacts are independent of polarity and can be used both with AC and DC systems.

Some hints for the design of the system:

• The Alarm output connector is, according to IEC 60601-1-8, a non-guaranteed alarm. The user must establish a pre-use function check routine for this application.

Technical data Connector type: ... 4-pole modular 4/4, female Max. switching voltage: ... 40 V Max. switching current: ... 500 mA Max. switching power: ... 20 W Useful life (relay): ... 100,000,000 operations. The useful life of the relay will be reduced as the switching power increases.

• Preferably the NC contact should be used, as this will detect any interruption in the alarm system or unintentional disconnection of the cable between the system and the ventilator. Furthermore, if both the NO- and the NC-contacts are utilized, an even higher safety level for unforeseen failures can be achieved. Note that, in both cases, even an intentional disconnection of the ventilator will trigger the external alarm. • It is adviceable that the complete system is continuously monitored and that there is redundancy implemented for parts that have a limited life, e.g. alarm signalling lamps.

Functional check & maintenance The user must implement routines for Pre-use check and maintenance to secure that the complete system works as intended.

Circuit diagram

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GETINGE GROUP is a leading global provider of equipment and systems that contribute to quality enhancement and cost efficiency within healthcare and life sciences. Equipment, services and technologies are supplied under the brands ARJO for patient hygiene, patient handling and wound care. GETINGE for infection control and prevention within healthcare and life science and MAQUET for Surgical Workplaces, Cardiopulmonary and Critical Care.

© Maquet Critical Care AB, 2003-2006. All rights reserved. MAQUET reserves the right to modify the design and specifications contained herein without prior notice. Order No.: 66 28 734, Revision 03, July 2006. Price group: 1. Printed in Sweden. 060703

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