Dräger X-am 5000 Gebrauchsanweisung Seite 26

Adjusting the sensitivity for an individual measuring channel
– The span adjustment can be carried out selectively for individual sensors.
– In the case of the span adjustment, the sensitivity of the selected sensor is
set to the value of the test gas used.
– Use a standard test gas.
Allowed test gas concentration:
Ex: 40 to 100 %LEL
O 10 to 25 vol. %
2
CO: 20 to 999 ppm
H S: 5 to 99 ppm
2
Test gas concentrations of other gases: see Instructions for Use of the
respective DrägerSensors.
 Connect the test gas cylinder with the calibration cradle.
 Vent the test gas into a fume cupboard or into the open air (with a hose
connected to the second connector of the calibration cradle).
Never inhale the test gas. Health hazard!
Observe the hazard warnings of the relevant Safety Data Sheets.
 Switch on the instrument and insert it into the calibration cradle.
 Press the [ + ] key and keep it pressed for 5 seconds to open the calibration
menu, enter the password (password on delivery = 001).
 Use the [ + ] key to select the single gas adjustment function. The symbol for
span adjustment » « flashes.
 Press the [OK] key to start the channel selection.
– The display flashes the gas of the first measuring channel, e.g. » ch4 - %LEL «.
 Press the [OK] key to start the calibration function of this measuring channel, or
use the [ + ] key to select another measuring channel (O
CO - ppm, etc.).
– The test gas concentration is displayed.
 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 measurement value flashes.
 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 measurement value changes to the value according
to the supplied test gas.
26
CAUTION
- Vol.-%, H S - ppm,
2 2
When the displayed measurement value is stable (after at least 120 seconds):
 Press the [OK] key to perform the calibration.
– The display containing the current gas concentration changes with the
display » OK «.
 Press the [OK] key or wait for approx. 5 seconds to end the adjustment of this
measuring channel.
– The next measuring channel is displayed for adjustment if necessary.
– After the adjustment of the last measuring channel, the instrument changes
to the measuring mode.
 Close the test gas cylinder valve and remove the instrument from the
calibration cradle.
If a fault has occurred during the span adjustment:
– The fault message » « appears and »
respective sensor instead of the measured value.
 In this case, repeat the adjustment.
 Change the sensor if necessary.
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.
Cleaning
The instrument does not need any special care.
 Dirt and deposits can be removed from the instrument by washing it with
cold water. A sponge can be used for wiping if necessary.
Abrasive cleaning tools (brushes etc.), cleaning agents and cleaning solvents
can destroy the dust and water filters.
 Carefully dry the instrument with a cloth.
« is displayed for the
CAUTION