XZR200 User’s Manual
10
97337 Issue 4, July 2018
INSTALLATION
3.6.3 Variable Output Filtering (Td Averaging)
The XZR200 is factory set to use adaptive output
fi
ltering to give an optimum balance
between output stability and response to oxygen changes. However, this balance may
be altered by the customer to suit the needs of the application.
1.
Connect the analyzer via the RS232 interface to the PC. See Section 2.1
on Con
fi
guration.
2. Press
ENTER
then enter your security password. Press
ENTER
to access
the menu screen.
3.
In the Con
fi
guration Menu (menu 2) enter the Td average screen (Option
2 - Enter Td Averaging).
4. The number entered should be between 0 and 200. 0 for adaptive
fi
ltering (recommended), 1 for very fast and dynamic output response
but relatively unstable, to 200 for an extremely stable output but very
slow response to oxygen changes.
5. Press
ENTER
to save.
The new averaging value is now stored in memory. This value is retained on power loss.
Td output by the XZR200 is proportional to the partial pressure of oxygen (PPO2) and
the typical value of Td per mbar of PPO2 is 1.05ms ±15%.
For example if we have 20.7% oxygen in 1000mbar barometric pressure the PPO2 value
would be 207mbar. This equates to a typical Td of 207*1.05=217.5ms.
To convert the XZR200 Td output back to ms the number must be multiplied by 0.000048
which is the clock period of the microprocessor in seconds.
So for the example above a Td value of 217.5ms would be output from the XZR200 as,
0.2175/0.000048 = 4531.
3.6.4 Changing the Automatic Calibration Value
The system is factory set to automatically calibrate to 20.7% O
2
to allow simple
calibration in normal air. The auto calibration value is factory set to 20.7% to take into
account average humidity in the atmosphere. If a calibration with a gas of a different
known oxygen concentration is required, then the factory set value may be changed via
the RS232 interface.
1.
Connect the XZR200 via the RS232 interface to the PC. See Section 2.1
on Con
fi
guration.
2. Press
ENTER
then enter your security password. Press
ENTER
to access
the menu screen.
3. In the Con
fi
guration Menu (menu 2) enter the auto calibration value
screen (Option 1 - Enter Auto Calib).
4. The number entered should be the oxygen concentration (%) of the
calibration gas to 2 decimal places. Press
ENTER
to save.
Summary of Contents for XZR200
Page 1: ...XZR200 Oxygen Analyzer User s Manual 97337 Issue 4 July 2018 ...
Page 24: ...XZR200 User s Manual Michell Instruments 17 CALIBRATION Appendix A Technical Specifications ...
Page 27: ...XZR200 User s Manual 20 97337 Issue 4 July 2018 APPENDIX B Appendix B Theory of Operation ...
Page 35: ......
Page 36: ...http www michell com ...
