YSI EcoSense DO200A - Manual (Page 4)

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GENERAL INTRODUCTION
The DO200A is a precise tool that measures temperature and dissolved oxygen in % and
ppm (mg/L) .
This instrument has a waterproof IP67 case when the connector cap is installed. The keys are
highly reliable with tactile and audio feedback. This instrument uses one 9V battery. Re-
calibration is not required after turning the instrument off and on.
The front of the instrument has a large LCD that displays DO %, ppm, and temperature
simultaneously along with user prompts and mode indicators. The unit prompts the user
through calibration and measurement procedures.
The model DO200A field and lab probes use a polarographic electrode with convenient
screw-on cap membranes. The 200-4 and 200-10 field probes come with a built-in
temperature probe for automatic temperature compensation, as well as a stainless steel body
for added weight. The self stirring 200-BOD lab probe comes with a power supply and has
replaceable electrodes.
Other features include long battery life and high 50/60 Hz AC noise rejection. This instrument
is universal and user-friendly for field, industrial, and laboratory applications.
INITIAL INSPECTION
Carefully unpack the unit and accessories, and inspect for shipping damages. Compare
received parts with materials listed on the packing list. Notify YSI immediately of any damage
or missing parts. Save all packing materials until satisfactory operation is confirmed.
PRECAUTIONS
The Case
Though the instrument is housed in a water-proof IP67 case, DO NOT use it underwater. The
connector is not waterproof unless the cap is installed. In case of submersion without the cap
connected, follow these steps immediately:
1. Dry the connector if necessary. Rinse unit carefully with distilled water. After rinsing and
drying, inspect and clean connectors to remove all contaminants that may affect probe
connections.
2. Wait for unit and connectors to dry completely before resuming operation.
3. If the unit does not function correctly after steps 1 and 2, call YSI for possible repair or
replacement.
The Probes (Field & Lab)
1. Membranes last longer if properly installed and regularly maintained. Erratic readings
can result from damaged or fouled membranes or from large bubbles in the electrolyte
reservoir. If unstable readings or membrane damage occurs, replace both the
membrane cap and Oxygen Probe solution (O2 Probe Electrolyte). The average
membrane replacement interval is 4 to 8 weeks, although they may last longer if kept
clean. Harsh environments, such as wastewater, may require membrane replacement
every 2 to 4 weeks. Unstable readings may occur if membrane cap is coated with oxygen
consuming or producing organisms such as bacteria or algae.
2. Chlorine, sulfur dioxide, nitric oxide and nitrous oxide can affect readings by behaving
like oxygen at the probe.
3. Avoid substances that may damage probe materials such as concentrated acid, caustics
and strong solvents. Probe materials include Stainless steel, epoxy and ABS Plastic.
4. Keep the probe’s gold cathode clean and textured (when properly maintained it has a
matte finish). If it is tarnished (from contact with certain gases), or plated with silver (from
extended use with a loose or wrinkled membrane), then clean it, following the
instructions in “Probe Maintenance”.