Dräger Polytron 8100, Instructions For Use Manual, Page: 31 / 254

Maintenance
Dräger Polytron 8100 31
6.2.1 Zero Calibration
1. Select Calibration > Zero Calibration and confirm.
The Maintenance signal is transmitted and the symbol [ ]
is displayed.
The message
Apply zero gas is displayed.
2. Apply Synthetic Air or Nitrogen.
3. Select
Next and confirm.
The current value is displayed.
After the displayed value is stable:
1. Select Calibrate and confirm.
The message Please wait... is displayed.
The new current value is displayed.
2. Select Next and confirm.
3. Turn off gas flow and remove the calibration adapter from
the sensor or disconnect tubing.
If the current value is not within the alarm range:
4. Select
Next and confirm.
The instrument returns to the calibration menu.
6.2.2 Span calibration
1. Select Calibration > Span calibration and confirm.
The Maintenance signal is transmitted and the symbol [ ]
is displayed.
The parameters for the calibration gas are displayed, e.g.:
Depending on the sensor these parameters can be changed:
1. Select Gas and confirm.
2. Select the calibration gas from the list and confirm.
3. Select
Unit and confirm.
4. Select the unit of measurement from the list and confirm.
5. Select
Conc. and confirm.
6. Set the concentration of the calibration gas.
If the settings are correct:
1. Select Next and confirm.
A message like Gas flow ON H2S is displayed.
2. Apply calibration gas.
3. Select
Next and confirm.
The current value is displayed.
After the displayed value is stable:
1. Select Next and confirm.
The message Please wait... is displayed.
The new current value is displayed.
2. Select Next and confirm.
3. Turn off gas flow and remove the calibration adapter from
the sensor or disconnect tubing.
If the current value is not within the alarm range:
4. Select
Next and confirm.
The instrument returns to the calibration menu.
A calibration can be aborted at any time.
WARNING
Ambient air can be used to zero the sensor instead of
Nitrogen or Synthetic Air only 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.
NOTICE
For Oxygen (O
2
) sensors a zero calibration does not
change any value in the firmware or sensor. Thus, the
zero calibration function can be used to check the
correct zero reading when Nitrogen is applied to the
sensor. The Polytron 8100 will indicate a fault state if a
zero check fails with a deviation of more than 0.6 Vol%
O
2
from zero. In case of a fault, repeat the zero check
or change the sensor if necessary. Use Nitrogen (N
2
)
for verification.
!
i i
Gas H2S
Unit ppm
Conc. 25