General Introduction; Initial Inspection; Precautions; The Case - VWR DO210 Manual De Operaciones

GENERAL INTRODUCTION

The VWR DO210 instrument 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 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 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 VWR DO uses a polarographic electrode with convenient screw-on cap membranes. The
probe comes with a built-in temperature probe for automatic temperature compensation, as well
as a stainless steel body for added weight.
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 VWR 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, 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 VWR for possible repair or
replacement (see Warranty).

The Probe

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.
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".
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