9023927 - 2nd edition - May 2007
Page 39 of 72 Pages
The menu » Calibration «
The menu » Calibration «
The menu » Calibration « contains all functions needed for the calibration and adjust-
ment of the installed sensor.
Overview
Sub-menu » Zero. calibration «
The sub-menu » Zero calibration « contains the functions for calibrating / adjusting
the zero point of the installed sensor.
Zero point calibration / adjustment
The zero point can be calibrated without the use of zero gas when the ambient air is
free from measuring gas and other interfering gases. Alternatively:
●
Provide zero gas with a flow rate of 1.5 L/min via a T-piece to the inlet connection.
Connect a hose with a length of 0.5 m and a diameter which is larger than the
hose for the Polytron 7500 to the third connection of the T-piece.
Calibration procedure (using the DrägerSensor XS NF
3
as an example
)
:
●
Select the menu items » Calibration «, » Zero calibration « and » XS–NF
3
« in this
order, pressing the »
« key after each selection.
— The message » Supply zero gas with flow rate 500 ml/min « is displayed (this flow
rate is not to be observed for the Polytron 7500).
●
Supply zero gas to the sensor.
●
Select » Next « and press the »
« key.
— The current value and the expired time are now displayed.
Information
Calibration
Calibration
Settings
Zero. calibration
Zero calibration
Span calibration
XS–PFC
1)
1)
The sensor shown in this overview serves only as an example and may differ from the actual sensor installed in the unit.
Autocalibration
Span calibration
XS–PFC
1)
Attention! Never release zero gas directly (without T-piece) from a com-
pressed air cylinder!
1.5 L/min
04
1
2392
7_1_en.eps
OK
OK