Maintenance
Dräger Polytron 5200 / Dräger Polytron 53X0 19
4 Maintenance
4.1 Calibration
Calibration of the instrument must be performed at regular
intervals as detailed in the sensor data sheet.
General procedure
1. Attach the pressure regulator to the calibration gas cylin-
der.
2. Fit calibration adapter to the sensor.
3. The gas flow should be between 0.5 and 2.0 L/min. At
higher altitudes, a flow greater than 0.5 l/min might be nec-
essary (reduced partial pressure).
4. Connect the tubing to the barbed fitting.
1 Pressure regulator
2 Calibration adapter
3 Gas cylinder
4Tubing
Only for DSIR
z
Place the magnetic wand onto the sensor surface area
marked by and hold down for at least 5 seconds. The
display will change to a negative value (e.g. -10% LEL) as
long as the magnetic wand is held in place. This initiates
the auto-zeroing of the sensor.
z
Remove the magnetic wand. After 30 seconds, the sensor
will exit the auto-zeroing. As confirmation the display will
change again to a negative value (e.g. -10% LEL).
After this procedure the zero at the transmitter is adjusted for
eventual offsets.
4.1.1 Zero calibration
1. Enter the function with OK.
2. Apply synthetic air or Nitrogen.
z
The display will show the current value blinking (e.g. ‘2’).
z
Wait for the value to stabilize.
3. Use the Up / Down arrow to adjust the value to 0.
4. Acknowledge with OK; the display will then jump back to
the main menu.
5. Turn off the gas flow and remove the calibration adapter
from the sensor, or disconnect tubing.
4.1.2 Span calibration
1. Check the set gas category (only for DSIR).
2. Enter the function with OK.
3. Apply span gas (e.g. 50 %LEL Methane).
z
The display will show the current value blinking (e.g. ‘48’).
z
Wait for the value to stabilize.
4. Use the Up / Down arrow to adjust the value to 50.
5. Acknowledge with OK; the display will then jump back to
the main menu.
6. Turn off the gas flow and remove the calibration adapter
from the sensor, or disconnect tubing.
WARNING
Calibration gas must not be inhaled! See appropriate
Material Safety Data Sheets.
For proper operation, never adjust the span before
completing zero adjustment. Performing these opera-
tions out of order will cause the calibration to be faulty.
NOTICE
In some cases (e.g. combustible vapors) a more ac-
curate calibration can be obtained when the Dräger
calibration chamber is used instead of a calibration gas
cylinder.
!
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NOTICE
Ambient air can be used to zero the sensor instead of
Nitrogen or Synthetic Air if the area is known to be free
of the target gas or any gas to which the sensor may
be cross-sensitive (as listed on the sensor data sheet).
In this case, no cylinder or calibration adapter is
needed for the zero calibration.
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