Maintenance
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5 Maintenance
5.1 Maintenance
intervals
The sensor unit should be inspected and maintained annually by expert
personnel. Refer to the relevant national regulations as appropriate.
Please see the technical manual for details regarding spare parts.
5.2
Running a functional test
Only perform a functional test using one of the test gases given in the
technical manual.
Never apply test gas with overpressure; always fit a t-piece between the test
gas cylinder and the sensor unit. Only use a standard control valve (order no.
6810397) with 0.5 mL min
-1
.
Requirements:
– Suitable test gas cylinder with standard 0.5 mL min
-1
control valve and
gassing adapter fitted.
– The sensor unit is turned on, connected to the mobile app and the start-up
phase, heat-up phase and temperature stabilisation have been completed.
1. Connect the test gas cylinder to the sensor unit using the gassing adapter.
The water and dust filter must be fitted.
2. Open the valve on the test gas cylinder, whereby the minimum flow rate
must be 0.5 mL min
-1
.
3. Start the functional test in the mobile app.
4. Close and remove the test gas 3 seconds after starting the functional test.
Wait for the measurement period and result.
5. The result should differ from the test gas by a maximum of 20 %. At a test
gas concentration of 10 ppm, for example, the functional test is successful
with a result between 8 to 12 ppm.
If the functional test is not successful:
●
Calibrate the sensor unit.
5.3
Carrying out a calibration (Seeker and
Analysis measuring modes)
Measuring device errors may mean that calibration is not possible.
The Seeker and Analysis measuring modes are calibrated simultaneously. The
calibration process includes a fresh air calibration of Seeker measuring mode.
WARNING
Daily calibration may be necessary depending on the conditions of use. To
determine the calibration status by applying test gas, see functional test. If no
deviations in the calibration status are observed in consecutive tests, the
calibration interval can be gradually extended to up to 60 days. Further
information is available from your Dräger representative. If necessary, calibrate
the sensor unit.
NOTICE
Only carry out a calibration using one of the test gases given in the technical
manual.
NOTICE
Never apply test gas with overpressure; always fit a t-piece or gassing adapter
(order no. 6851850) between the test gas cylinder and the sensor unit. Only use
a standard control valve (order no. 6810397) with 0.5 mL min
-1
.
Requirements:
– Suitable test gas cylinder with standard 0.5 mL min
-1
control valve and
gassing adapter fitted.
– The sensor unit is turned on, connected to the mobile app and the start-up
phase, heat-up phase and temperature stabilisation have been completed.
1. Connect the gas cylinder to the sensor unit using the gassing adapter. The
water and dust filter must be fitted.
2. Start the calibration in the mobile app and follow the instructions. The user is
automatically guided through the calibration process and notified when the
test gas needs to be applied.
If the calibration is not successful:
– The mobile app will display the calibration as failed.
– Repeat the calibration, and have the sensor unit tested by maintenance
personnel as appropriate.
