ATI
Q45D Portable Dissolved Oxygen
Part 5
– Operation
5.2
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 of 1454. Press ENTER to initiate user entry mode and the
first digit will flash. Use arrow keys to modify value. 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
dissolved 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 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.
