14 Dräger Polytron 8200/8310
Calibration
5 Calibration
Repeat the calibration of the device at regular intervals as
specified in the particular sensor data sheet.
5.1 Calibrating the device
1. Connect the pressure reducer to the calibration gas cylinder.
2. Attach the calibration adapter to the sensor.
3. The gas flow should be between 0.5 and 2.0 L/min.
4. Connect the hose to the calibration adapter.
1 Pressure reducer
2 Calibration adapter
3 Test gas cylinder
4Hose
For DSIR only (see also Instructions for Use for
DrägerSensor IR)
1. Position the magnetic wand on the sensor button marked
with and hold it there for at least 5 seconds.
A negative value will be displayed for as long as the
magnetic wand is held on the button (e.g. -10 %LEL).
This will start the automatic zeroing of the sensor.
2. Remove the magnetic wand.
The sensor ends the automatic zeroing after approx.
30 seconds. A negative value (e.g. -10 %LEL) is displayed
again as confirmation.
After the zero-point calibration of the DrägerSensor IR,
the instrument should show 0 %LEL in the display. If this is not
the case, a zero-point calibration must be performed on the
instrument (see chapter 5.1.1 on page 14).
5.1.1 Zero point calibration
1. Select Calibration > Zero Calibration and confirm.
The Maintenance signal is transmitted.
The message Apply zero gas appears.
2. Apply zero gas (synthetic air or nitrogen) to the sensor.
3. Select Next and confirm.
The current value is displayed.
After the displayed value is stable:
4. Set the value to 0 and confirm.
The message Please wait… appears.
The actual value is displayed.
z Actual value within the permissible range:
{ Select Next and confirm.
{ Shut off the test gas and remove the calibration adapter
from the sensor or disconnect the hose.
CAUTION
Danger to health! Do not inhale the test gas.
Observe the hazard information in the corresponding
safety data sheets. Provide venting into a fume
cupboard or outside the building.
Always calibrate the zero point first before the
sensitivity. Otherwise the calibration will be faulty!
NOTICE
Calibration is not possible if the date and time are not
set (see chapter 8.2.3 on page 19).
Dräger recommends calibrating devices with the gas
that is to be measured operationally. This method of
measured gas calibration is more accurate than a
surrogate gas calibration. A surrogate gas calibration
may only be performed as an alternative if a measured
gas calibration is not possible.
!
i
i
NOTICE
Ambient air can also be used instead of nitrogen or
synthetic air to zero the sensor, provided it is insured
that the ambient air contains no measured gas or any
other gas for which the sensor may exhibit cross-
sensitivity (see the details in the sensor data sheet).
In this case, neither a gas cylinder nor a calibration
adapter is required for the zero point calibration.
i
i
To Next Page
Loading...
