Adjusting The Minimum And Maximum Ranges Of The Analog Outputs - Michell Instruments XZR200 User Manual

XZR200 User's Manual
The new Automatic Calibration value is now stored in memory. This value is retained on
power loss.
If calibration is required with a different gas of known O
the RS232 menus with a PC is not available in order to change the calibration percentage,
a manual calibration must be performed.
3.6.5

Adjusting the Minimum and Maximum Ranges of the Analog Outputs

(4-20mA and 0 to 10 V DC)
The XZR200 is factory default to output a range of 0-25% O
This range can be expanded to 0 to 100% O
is reconfi gured to output 0 to 100% O
the output ranges via RS232. This is extremely useful in applications where the O
variation is within a narrow band as it allows the analog outputs to be tailored to this
limited range.
1. Ensure the XZR200 is confi gured for 0 to 100% and RS232 operation. See
Section 2.1 on Confi guration.
2. Connect the XZR200 via the RS232 interface to the PC.
ENTER
3. Press
the menu screen.
4. In the Confi guration Menu (menu 2) enter the maximum range screen
(Option 3 - Enter O
5. The number entered should be between 1.00 and 100.00 to represent the
maximum output range. The number must also be greater than the saved
minimum range.
ENTER
6. Press
7. Enter the minimum range screen (Option 4 - Enter O
8. The number entered should be between 0.00 and 99.00 to represent the
minimum output range. The number must also be less than the saved
maximum range.
ENTER
9. Press
The new ranges are now stored in memory and are retained on power loss.
An example of changing the min and max output ranges would be in a normal air
atmosphere where the O
output range to 19% and the maximum output range to 22% and the outputs would
vary linearly in between. The min and max ranges lock out the outputs at the set limits
- so 19% O
2
higher would set the analog outputs to 10 V DC / 20mA.
NOTE: The min and max range adjustment does not apply to the RS232 output
and is overruled if the unit is reconfi gured for 0 to 25% operation.
Michell Instruments
then enter your security password. Press
Max Range).
2
ESC
to save and
to save.
range is between 20 to 21%. The user could set the minimum
2
or lower would set the analog outputs to 0 V DC / 4mA and 22% O
2
as described in Section 2.1. When the unit
2
the user also has the option to fully customize
2
to return to the Confi guration Menu.
INSTALLATION
concentration, and access to
via its two analog outputs.
2
ENTER
to access
Min Range).
2
2
or
2
11