Operation And Controls; Starting The X-Node; Signals And Alarms - Dräger X-node Technisches Handbuch

5

Operation and controls

X-node app X-node
Controls and settings Measurement,
visualisation of alarm
limit violation and
sending measure-
ment data
5.1

Starting the X-node

As described in Section 4.2 Assembly and commissioning, the X-
node is in operation as soon as the battery has been charged and a
sensor inserted. Removing the sensor will terminate the existing
Bluetooth connection. The X-node will then switch to standby mode,
which will transmit battery voltage and environmental data via LoRa
just a few times a day. The X-node only restarts and switches to an
active state once a sensor is reinserted (status LED briefly flashes
green, red, blue).
Technical manual |
Dräger X-node
The X-node then starts the gas measurement. If LoRa connections
have already been configured, the X-node will try to establish a
connection with the configured LoRaWAN provider directly after the
restart.
Without any sensor inserted, the X-node will not send any
Bluetooth advertisements and can therefore not be found in the app.
Even without any sensor inserted, the X-node remains active in the
LoRa network and reports its battery status and the environmental
data at longer intervals. This state leads to a very slow discharge
(> 2 years).
5.2
The status LED emits blue, green, yellow and red signals. The
various operating modes and the functionalities they include are
Server
described in further detail below.
Receiving and fur-
– Start phase
ther processing of
When the X-node is (re)started, the device will perform several
data
self-tests. A brief flashing of blue-red-green signals a successful
test.
– Visualisation of the gas concentration
The X-node constantly checks the range within which the gas
concentration currently being measured is found. With CO
(carbon dioxide), a measurement will only be carried out shortly
before the display interval set; measurements are carried out on a
second by second basis for other gases. There are two threshold
values here:
– A1: Pre-alarm
– A2: Main alarm
Standard values for these thresholds are stored in the sensor for
every sensor. Individual thresholds can be defined using the app
(see "Setting the alarm limits", page 63).
Operation and controls

Signals and alarms

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