
DOTX-45 Dissolved Oxygen System Part 6 – Configuration
DOTX-45 34 -
6.24 Configuration Menu [CONFIG]
The Configuration Menu contains all of the general user settings:
Entry Lock This function allows the user to lock out unauthorized
tampering with instrument settings. All settings may be
viewed while the instrument is locked, but they cannot be
modified. The Entry Lock feature is a toggle-type setting;
that is, entering the correct code will lock the transmitter and
entering the correct code again will unlock it. The code is
preset at a fixed value. Press ENTER to initiate user entry
mode and the first digit will flash. Use arrow keys to modify
value. See Page 67 for the DOTX-45 lock/unlock code.
Press ENTER to toggle lock setting once code is correct.
Incorrect codes do not change state of lock condition.
Set Delay The delay function sets the amount of damping on the
instrument. This function allows the user to apply a first
order time delay function to the oxygen measurements being
made. Both the display and the output value are affected by
the degree of damping. Functions such as calibration are
not affected by this parameter. The calibration routines
contain their own filtering and stability monitoring functions to
minimize the calibration timing. Press ENTER to initiate user
entry mode, and the value will flash. Use the arrow keys to
modify value; range is 0.1 to 9.9 minutes. Press ENTER to
store the new value.
Contrast This function sets the contrast level for the display. The
custom display is designed with a wide temperature range,
Super-Twist Nematic (STN) fluid.
The STN display provides the highest possible contrast and
widest viewing angle under all conditions. Contrast control
of this type of display is generally not necessary, so contrast
control is provided as a means for possible adjustment due
to aging at extreme ranges. In addition, the display has an
automatic temperature compensation network. 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
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