Gas Sensor; Differential Pressure Sensor; Alarms; Touchscreen Operation - Dräger Air Guard Serie Instrucciones De Uso

en Operation
4.3.1

Gas sensor

The gas sensors start during the warm-up phase after the
Air Guard is turned on. The warm-up time can vary depending
on the sensor; the exact values can be found in the relevant
instructions for use for the sensors.
4.3.2

Differential pressure sensor

1. Turn on the Air Guard.
2. Pressurise the Air Guard.
NOTICE
If the Air Guard is ready for operation and the flow has
reached the value needed for measurements, the green
signal lamp light up.
3. If the flow value falls below the minimum level, the red
signal lamp lights up. If the flow is too low, the input
pressure must be checked and the connected hoses
inspected for leakage and damage.
4.3.3

Alarms

NOTICE
If the limit values are exceeded again after a purging time of >
5 minutes, the entire system (compressor, filter etc.) must be
checked. If necessary, service the system, repair it or add
additional filters.
NOTICE
The alarm limit values can be viewed via the Air Guard menu
(see chapter 4.4.11).
NOTICE
In the case of a device malfunction, the red signal lamp lights
up. At the same time, the two potential-free contacts are
opened.
A collective alarm is issued on the corresponding relay if one
of the set limit values is exceeded. The green signal lamp goes
out.
If the preconfigured alarm threshold is exceeded, the yellow
signal lamp lights up. If the values fall again below the alarm
threshold, the yellow signal lamp automatically goes out and
the green signal lamp lights up again.
If the preconfigured alarm value is exceeded, the red signal
lamp lights up. At the same time, the two potential-free
contacts are opened.
The Air Guard can only be reset by purging the system (see
chapter 4.4.5).
Open the alarm overview on the Air Guard touchscreen to see
which alarm was exceeded (see chapter 4.4.3). The
corresponding measured values flash yellow (warning), red
(alarm) or black (malfunction).
If the flow rate is too low, the circle next to the word "differential
pressure sensor" is filled in red. If the flow rate is once again
sufficiently high after falling below the limit value, the circle
changes to grey and the frame around the circle flashes. The
Air Guard is reset by purging the system.
20
4.4

Touchscreen operation

The Air Guard is operated via the touchscreen. The user can
navigate from each menu element directly to the
corresponding menu using the four operating keys below the
touchscreen.
The keys below the touchscreen are assigned as follows:
F1

Overview complete

F2 Purge
F3 Acknowledge alarm
The audible alarm is stopped. The visual
alarm and the potential-free contacts are not
influenced by this action.
F4 Settings
4.4.1

Progress screen

The progress screen is
displayed during the
warm-up phase of the
sensors and the system
start-up. This is
visualised by a
progress bar.
4.4.2

Language selection

The language selection
screen appears as
soon as the start-up
phase is complete.
Choose the desired
language.
4.4.3 Overview complete
The overview complete
screen displays all
measured values of the
installed sensors. It
also displays the status
of the pressure switch.
NOTICE
Except for CO , where there are 4 digits, the display can show
2
a maximum of 3 digits of the measured value. As soon as a
measured value exceeds a limit value, a hashtag (#) is
displayed instead of the measured value.
Tapping the Single value / Trends button leads to a selection
screen for the single values or the time behaviours of the
sensors.