YSI DO200 - Manual (Page 4)

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GENERAL INTRODUCTION
The DO200 is one of three instruments in the EcoSense® product line from YSI. The DO200 is
a precise tool that measures dissolved oxygen in % and ppm (mg/L) and temperature. A built-in
microprocessor stores, calculates, and compensates for all parameters related to DO
determinations including DO electrode temperature characteristics.
This unit has a splash-resistant IP65 case. The mechanical touch keys are highly reliable with
tactile and audio feedback. This instrument uses one 9V battery. Re-calibration is not required
when power is restored.
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 DO200 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
200-BOD lab probe comes with a power supply and includes self-stirring and 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 DO200 instrument is housed in a splash-proof IP65 case, DO NOT use it
underwater; the connector is not waterproof. The splash-resistant case prevents permanent
damage to the unit if accidentally sprayed with non-corrosive solutions. In case of submersion,
follow these steps immediately:
1. Dry the connector if necessary, and replace the DO probe. 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 probe 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 (see Warranty).
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 (also known as “O2 Probe Electrolyte”, potassium chloride, or
KCl
solution). The average 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 oxygen evolving 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.