PROGRAMMING
4-38
4.7.10
Change Dilution Ratio
If a dilution system is used upstream of the MiniRAE 2000
inlet port, the user can enter the dilution ratio (from 1 to
10) to compensate the readings. The unit will then display
the actual concentration of the gas before dilution. The
dilution ratio should be 1 in normal operation where no
dilution gas is applied to the sample gas. Dilution
improves accuracy and linearity when the concentrations
are above a few thousand ppm.
1. “Change Dilution Ratio?” is the tenth sub-menu item in
the Monitor Setup menu.
2. Press the
[Y/+]
key; the display shows the current
dilution ratio: “Dilution Ratio = xx” with the left most
digit flashing.
3. Press the
[Y/+]
or
[N/-]
key to increase or decrease the
value of the digit. Press
[MODE]
momentarily to
advance to the next digit. The flashing digit will move
to the next digit to the right. Repeat this process until
both digits of the new dilution ratio are entered.
4. Press and hold the
[MODE]
key for 1 second to exit the
data entry mode and move to the next sub-menu.
5. If there is any change to the existing dilution ratio, the
display shows “Save?” Press
[Y/+]
to confirm the new
value or press
[N/-]
or
[MODE]
to discard the changes
and move to the next sub-menu.
