ATI
Q46D-ODO Optical D.O. System
Part 5 – Configuration
34
O&M Manual
Rev-J (8/17)
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 on page 66 of this manual. This value is only
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.
The reference table on page 66 is provided to convert inHg
from several other common air pressure units. Press ENTER
to store the new value.
Proc Cond
The Q46 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.
