Dräger X-AM 2500, Instructions For Use Manual

Page: 29 / 248

Dräger X-am 2500 29
Operation
Adjusting the sensitivity for an individual measuring channel

The span calibration can be carried out selectively for individual
sensors.

In the case of the span calibration, 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:
1. Connect the test gas cylinder with the calibration cradle.
2. 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).
3. Switch on the instrument and insert it into the calibration cradle.
4. Press the [+] key and keep it pressed for 5 seconds to open the
calibration menu, enter the password (password on delivery = 001).
5. Use the [+] key to select the single gas adjustment function.
The symbol for span calibration flashes.
6. Press the OK key to start the channel selection.
The display flashes the gas of the first measuring channel,
e.g. ch4 %LEL .
7. Press the OK key to start the calibration function of this measuring
channel, or use the [+] key to select another measuring channel
(O
2
- vol. %, H
2
S - ppm or CO - ppm, etc.).
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 measurement 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 measurement value changes to the value
according to the supplied 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 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.
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 is displayed for the
respective sensor instead of the measured value.

In this case, repeat the calibration.

Change the sensor if necessary.
Ex: 40 to 100 %LEL
O
2
: 10 to 25 vol. %
CO: 20 to 999 ppm
H
2
S: 5 to 99 ppm
Test gas concentrations of other gases: see Instructions for Use of
the respective DrägerSensors.
CAUTION
Never inhale the test gas. Health hazard!
Observe the hazard warnings of the relevant Safety Data
Sheets.
!