16
Dräger Polytron 8000
Calibration
After the displayed value is stable:
4. Confirm with
OK
.
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.
5.1.2
Span calibration
1. Select
Calibration > Span calibration
and confirm.
The parameters of the selected test gas are displayed.
Example EC H
2
S sensor
The unit and the test gas concentration can be changed.
The test gas can also be changed for some sensors
(e.g. DrägerSensor OV).
To change the test gas:
a. Select
Cal.Gas
and confirm.
b. Select the required test gas and confirm.
To change the unit:
a. Select
Unit
and confirm.
b. Select the required unit and confirm.
To change the test gas concentration:
a. Select
Conc.
and confirm.
b. Select the desired test gas concentration and confirm.
2. Select
Next
and confirm.
3. Apply test gas (e.g. 50 ppm H
2
S).
The current value is displayed.
After the displayed value is stable:
4. Confirm the value.
5. Shut off the test gas and remove the calibration adapter
from the sensor or disconnect the tube.
5.2
Performing Auto Calibration
The device offers the option of an automatically sequenced
calibration. This reduces the number of otherwise manual
interactions with the device. The auto calibration is only
suitable for experienced users, as calibration errors can occur
here as a result of tightened procedures.
1. Select
Settings > Sensor > Autocal. set.
to enable or
disable the function.
2. Supply fresh air or apply nitrogen or compressed air to the
sensor at a flow rate of 0.5 L/min.
3. Select
Calibration > Auto cal.
and confirm.
{
Please wait...
is displayed and a calibration of the zero
point is performed automatically.
{
After a successful zero point calibration, the span
calibration is started.
{
The test gas concentration, the units and,
where appropriate, the calibration gas are displayed
and can be changed.
4. Start the calibration with
Next
;
Back to menu
aborts
the calibration.
5. Apply the test gas to the sensor at a flow rate of 0.5 L/min.
{
When the measured value is stable, the device performs
the calibration automatically.
{
After a successful calibration, the measurement and
the message
Value OK?
are displayed
6. When the value is stable, shut off the test gas and wait until
the measurement is below any possible alarm thresholds
again.
z
The calibration is performed again with
Redo
.
z
Complete the calibration with
Accept value
The device returns to the measurement mode.
Cal. gas: H
2
S
Unit:
ppm
Conc.:
000025
NOTICE
Not all of the available sensors and gases support auto
calibration. If the function is not available, a manual
calibration must be performed.
WARNING
It must be insured that during the zero point calibration,
no target gas is present in the supplied test gas.
Particularly with a fresh air calibration, Dräger
recommends performing a second, independent
measurement. Some sensors may only be calibrated
with synthetic air or nitrogen (see respective sensor
data sheets).
NOTICE
After 10 minutes, without confirmation the device
reverts to measurement mode without performing
a calibration.
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