Dot-x SERIES Specifikace Strana 36

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DOTX-45 Dissolved Oxygen System Part 6 Configuration
DOTX-45 35 -
close to the same. However, 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 DOTX-45 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 DOTX-45 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 DOTX-45 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.
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