Maintenance Table - Dräger MQG 0011 Gebrauchsanweisung

Maintenance
7. Press the OK key to start the calibration function of this measuring
channel, or use the [+] key to select another measuring channel
(O - vol. %, H S - ppm, CO - ppm etc.).
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The test gas concentration is displayed.
8. Press the OK key to confirm the test gas concentration or use the
[+] key to change the test gas concentration and complete the
process by pressing the OK key.
The measured value flashes.
9. Open the test gas cylinder valve to let gas flow over the sensor
with a volume flow of 0.5 l/min.
The displayed, flashing measured value changes to the value
corresponding to the applied test gas.
When the displayed measurement value is stable (after at least
120 seconds):
a. Press the [OK] key to perform the calibration.
The display containing the current gas concentration changes
with the display OK.
b. Press the OK key or wait approx. 5 seconds to end the
calibration of this measuring channel.
The next measuring channel is offered for calibration if
applicable.
After calibration of the last measuring channel the instrument
switches to measuring mode.
c. Close the test gas cylinder valve and remove the instrument
from the calibration cradle.
If a fault has occurred during the span calibration:
The fault message appears and

respective sensor instead of the measured value.
In this case, repeat the calibration.

Change the sensor if necessary.

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Notice for the adjustment of the ex-channel to nonane as
a measuring gas:
During the calibration of the ex-channel, propane can be used as

a substitute test gas.
When using propane to adjust the ex-channel to nonane,

the display must be set to twice the used test gas concentration.
Notice for the use in subsurface mining:
For the calibration of the ex-channel to the measuring gas

methane, the display of the instrument must be set to a value of
5 % (relative) higher than the test gas concentration.
5
5.1
The instrument should be inspected and serviced once a year by
suitably qualified persons. Comparisons:
EN 60079-29-2 – Gas detectors – Selection, installation, use and
maintenance of detectors for flammable gases and oxygen
EN 45544-4 – Electrical instrument 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
Recommended calibration interval for measuring channels Ex, O
H S and CO: 6 months. Calibration intervals of other gases:
2
see Instructions for Use of the applicable DrägerSensors.
is displayed for the
See the Technical Manual for details of spare parts.
Maintenance

Maintenance table

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Dräger X-am 2500