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Requirements:
– At least one DrägerSensor XXS H2 HC (68 12 025)
is activated. H2 is set as the measurement gas.
– An Ex channel on the DrägerSensor DUAL IR
Ex/CO2 (68 11 960) or DrägerSensor IR Ex
(68 12 180) is activated.
– Both channels are set to the unit %LEL/%LEL/%LIE.
– The H2 added signal is only possible with a
DrägerSensor XXS H2 HC and an IR Ex channel.
When the H2 added signal is activated, the LEL gas
concentrations of both selected sensors are added
together and the result is shown in the display in the
place of the IR Ex display.
An activated H2 added signal is displayed with a + next
to the gas name of the IR Ex sensor in the display.
Previously set alarm thresholds are maintained in order
to ensure that in the presence of hydrogen (H2) the
alarm of the IR Ex Channel is triggered earlier if
required.
5 Maintenance
5.1 Maintenance intervals
For inspections and maintenance, see:
– EN 60079-29-2 – Guidelines for selection,
installation, use and maintenance of instruments for
the detection and measurement of flammable gases
and oxygen
– EN 45544-4 – Electrical apparatus used for the
direct detection and direct concentration
measurement of toxic gases and vapours – Part 4:
Guide for selection, installation, use and
maintenance
– National regulations
5.2 Calibration intervals
Observe the relevant specifications in the Sensor
Handbook or in the instructions for use/data sheets of
the DrägerSensors installed.
Recommended calibration intervals for DrägerSensors:
Replacing, retrofitting or removing sensors, see
technical manual.
5.3 Test gases
Test gas properties (e.g. relative humidity,
concentration) can be found in the relevant sensor data
sheet.
The relative humidity of the test gas is not relevant for
O2 sensors.
Different test gases are used depending on the type of
calibration.
5.4 Perform bump test
The bump test can be performed as follows:
– Bump test with the wizard (quick bump test)
– Bump test with X-dock (quick or extended bump
test)
Dräger recommends using the extended bump test
for cross calibrations (Dräger X-dock instructions for
use).
X-am 8000: If the gas detection instrument is
equipped with a PID sensor, Dräger recommends not to
use the Nonane tester (order no. 83 25 61) for the
bump test because of the long saturation time of the
PID sensor.
Test Interval
Inspection and mainte-
nance by specialists.
Every 12 months
Check signalling ele-
ments with the signal test
Automatically each time
the device is started or
manually
DrägerSensor Calibration interval
CatEx, O2, H2S, H2S LC,
CO LC, SO2, NO2
Every 6 months
IR Ex/CO2 Every 12 months
For certified measuring
function: Every 6 months
PID HC, PID LC ppb Depending on the applica-
tion conditions, daily cali-
bration may be necessary.
The interval can be
extended little-by-little to
30 days if there are no cal-
ibration deviations on con-
secutive inspections.
Other DrägerSensors See the special data
sheets for the respective
sensors.
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