ATI Q46D Dissolved Oxygen System Part 6 - Configuration
32
O&M Manual
Rev-N (4/21)
Contrast This function sets the contrast level for the display. The custom display
is designed with a wide temperature range and contains an LED back
light so that the display is can be seen in the dark.
Press ENTER to initiate user entry mode, and the value will flash. Use
arrow keys to modify the value; range is 0 to 8 (0 being lightest). Press
ENTER to update and store the new value.
Instr Type This function allows the user to change the type of measurement to be
displayed in the primary display area. The user may select “1 PPM”¸ “2
mg/L, or “3 %Sat”. There is not a great deal of difference between type
1 and 2 settings as PPM and mg/L measurement units are pretty close to
the same.
Programming for type 3 percent saturation changes the measured
parameter to read a dissolved oxygen value that represents the percent
of oxygen saturation at a given temperature. When this unit of
measurement is selected, the main analog output and all alarm and
control functions will relate to this measurement. While a PPM
measurement is displayed on the lower line, it is no longer the primary
variable being measured by the system. Press ENTER to initiate user
entry mode, and the selected value will flash. Use the UP arrow key to
modify the desired display value. Press ENTER to store the new value.
Zero Filter The Q46D allows the user to program a value near zero below which the
monitor will read zero. Because sensors rarely have a perfect zero
stability, this zero filter eliminates occasional displays of numbers that
are not meaningful. For instance, setting a zero filter at 0.03 PPM D.O.
will cause any measured values of 0.01 or 0.02 PPM to be displayed as
0.00 PPM.
Atm Pres The Q46D instrument utilizes the atmospheric pressure value as an input
for the calculation of a theoretical ppm value during a saturation
calibration. The input default units are inHg (inches Mercury) since these
units are easy to obtain from most local weather services or from the
general chart located in page 64 of this manual. This value is only
required to be entered during initial installation – it does not need to be
modified at every calibration. Press ENTER to initiate user entry mode
and the entire value will flash. Use the arrow keys to modify the value;
range is 20.00 to 31.50 inHg.
A reference table is provided in Section 9 to convert to inHg from several
other common air pressure units. Press ENTER to store the new value.
Proc Cond The Q46D instrument also utilizes the process conductivity value as an
input for the calculation of a theoretical ppm value during a saturation
calibration. This value is only required to be entered during initial
installation - it does not need to be modified at every calibration. Press
ENTER to initiate user entry mode and the value will flash. Use the arrow
keys to modify the value; range is 0.00 to 76.00 mS/cm. Press ENTER to
store the new value.
Note: If the user will not be changing solution conductivity dramatically
during the calibration process, leave a default setting of 00.50 mS/cm.
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