Installation; Initial Setup; Preparing The Probe - VWR DO220 Manuel D'instructions

I n s t a l l a t i o n

Initial Setup

Throughout the manual, the term "probe" refers to the end of the cable
where the sensor is located, the term "sensor" refers to the Optical
Dissolved Oxygen sensing portion of the cable/probe assembly, and the
term "sensor cap" refers to the removable sensing cap that is replaced
about once per year (Figure 1).
Sensor
Probe

Preparing the Probe

Each VWR DO220 sensor cap has unique calibration coefficients
associated with it. These coefficients are labeled on the instruction sheet
included with each VWR DO220 cable/probe assembly and replacement
DO220 sensor cap. Remove the probe/cable assembly from the shipping
container and locate the sensor cap instruction sheet. Be sure to save the
instruction sheet in case you need to reload these calibration coefficients.
New probe/cable assemblies have the sensor cap installed and
coefficients loaded into the probe at the factory. When a cable is installed,
the coefficients are automatically sent to the instrument.
Preparing the probe for the first time:
1. Remove the probe guard from the probe by turning it counterclockwise.
2. Remove the red storage cap which contains a moist sponge from the
end of the probe by pulling it straight off the sensor. Save this to use
later for long term storage.
3. Reinstall the probe guard by sliding it carefully over the sensor and
then threading it onto the cable/probe assembly with a clockwise
rotation (Figure 2).
4. Locate the gray calibration/storage sleeve that was shipped with your
probe/cable assembly. Moisten the sponge in the gray calibration/
storage with a small amount of clean water.
5. Slide the calibration/storage sleeve over the probe guard to keep the
probe in a moist environment for storage and calibration (Figure 3).
Figure 1
2
Sensor Cap