4
5.
To prevent the membrane and electrolyte from drying out, store the field probe in the
calibration bottle with the moistened, clean sponge and the lab probe in a clean BOD
bottle with 1 inch of water to keep them in a saturated air environment.
PROBE PREPARATION
The DO200A probe ships with a dry, protective membrane. To install a new membrane cap
on the probe:
1.
Unscrew probe membrane cap and discard.
2.
Fill a new cap with Oxygen Probe Solution. If using the probe solution for the first time,
prepare it according to directions on the bottle.
3.
Thread filled membrane cap onto sensor.
4.
Allow sufficient warm-up time for initial use (10-15 min). During this time an “ovEr”
message may appear on the display. This is normal. After the warm up is complete the
message will disappear.
BATTERY INSTALLATION
An initial display of “LOW BAT” on the LCD indicates
approximately one hour of battery life for unit operation within
specifications. Replace battery when “LOW BAT” appears on
the LCD.
To replace battery, remove the two battery cover screws and
the
battery cover and o-ring. Replace the 9V battery. Replace the
battery cover and o-ring (be sure to align the o-ring correctly to
prevent a bad seal) and fasten the two battery cover screws for
the water-proof feature.
Battery Disposal
This instrument is powered by a 9 volt battery, which the user must remove and dispose of
when the batteries no longer power the instrument. Disposal requirements vary by country
and region, and users are expected to understand and follow the battery disposal
requirements for their specific locale.
THE KEYPAD
1.
: Turns the unit on or off.
2.
MODE: In normal operation, toggles display between Dissolved Oxygen in % air
saturation, Dissolved Oxygen in ppm (mg/L), Delete and Recall. In Calibration mode,
exits current calibration and displays the next calibration parameter.
3.
CAL: In normal operation, changes the mode from Normal to Calibration. See
Calibration Set-up.
4.
:
In Calibration Set-up, press this key to save the current parameter to memory.
5.
and
Keys: Increases or decreases the display value as desired.
THE LCD DISPLAY
1.
BAT: Low battery indicator.
2.
CAL: Calibration mode indicator.
3.
SAL ppt: Displays during calibration
when user is prompted for the
approximate salinity of the sample in
parts per thousand (ppt).
4.
mBar: Displays during calibration to
prompt user for barometric pressure.
5.
Main display for dissolved oxygen
values.
6.
%/ppm: Unit indicators.
A
BA
T
SAL ppt
mBar
% ppm
1
2
3
4
5
7
C
CAL
6
Figure2. LCD Display
Figure 1.
Battery Installation
