ATI
Q45D Portable Dissolved Oxygen
Part 5
– Operation
Zero Filter
The Q45D 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.
AtmPres
The Q45D 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. 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 Q45D 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.
Out#2 Mode
This function sets analog output #2 to either track temperature (default)
or dissolved oxygen. Press ENTER to initiate user entry mode, and the
entire value will flash. Use the UP arrow key to modify the desired value;
selections include 1-C/F for temperature tracking, or 2-ppm for dissolved
oxygen tracking. Press ENTER to store the new value.
Temp Units
This function sets the display units for temperature measurement. Press
ENTER to initiate user entry mode, and the entire value will flash.
Use the UP arrow key to modify the desired display value. The choices
are
°F
and
°C
. Press ENTER to store the new value.
5.3
Control Menu[CONTROL]
The Control Menu contains all of the output control user settings:
Set 0V #1
These functions set the output range for each of the two instrument
Set 2.5V #1
outputs. The value stored for the 0V point may be higher or lower than
Set 0V #2
the value stored for the 2.5V point.
Set 2.5V #2
The entry values are limited to values within 40.00 ppm and must be
separated by at least 1% of this range Use the LEFT arrow key to select
the first digit to be modified. Then use the UP and LEFT arrow keys to
