Safety Features; Alarms; Alarm For Set Value Deviations And Water Shortage - Dräger 8000 IC Function Description

1.2

Safety Features

A self-test is conducted when the incubator is switched on. This involves a test of all memories
in the microprocessor control system and a check to establish whether the various program
segments are running correctly.
The function of actuators, acknowledgement signals, displays and indications is checked by
switching them on and off. For example, the functioning of the fan is checked not by
establishing whether power is reaching the electric motor, but rather by measuring the speed
of rotation directly on the fan. The wiring to peripheral devices is provided in duplicate.
This complete test is also repeated every 10 minutes during operation.
All options, whether they are activated or not, are tested. An error message is thus indicated
for a faulty module even if it is switched off. This ensures that the operator is always fully
aware of the actual condition of the incubator.
When the incubator is switched on again, or when a module is switched on, the relevant
required value is set to "starting value". The set value display then flashes requesting
confirmation or modification of this value. The actual value indication is displayed alternately
with the prompt "SET" (not humidity Inc. 8000 SC / NC).
1.3

Alarms

The incubator has a graduated system of alarm signals. Faults which occur are signalled in
order of importance. If a non-essential option fails, it does not mean that the incubator has to
discontinue any functions which are of vital importance. The set value deviation and water
shortage alarms are signalled by an intermittent warning tone which can be suppressed for 10
minutes. Faults which entail greater potential danger are signalled by a continuous tone which
cannot be silenced. In addition, the relevant warning LEDs flash to enable the operator to
locate the fault rapidly. The alarm signals are described in detail below.
1.3.1

Alarm for set value deviations and water shortage

Deviations outside the set limits for oxygen concentration (> 5 % by Vol. 02), skin temperature
(> 0.5 °C with software version 10.n or 20.n and > 1.0 °C with software version 11.n and 21.n
on us units only) and air temperature (> 1.5 °C), in addition to over-temperature (> 38 °c or >
39.9 °C) and water shortage result in the following alarm signals:
- The actual value display of the relevant control module flashes.
- The specific alarm LED flashes.
- Intermittent alarm tone sounds (can be suppressed for 10 min.).
- The central alarm LED flashes (if available).
6141.22X Incubator 8000 IC/SC/NC
Function Description
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