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1.
Introduction
The O2X sensor is designed to continuously measure dissolved oxygen levels in liquids.
The O2X is effective in saving energy costs associated with aeration systems in an
activated sludge process. In addition, accurate measuring of dissolved oxygen allows
for better control of nitrification/denitrification.
2.
A few words about this manual
This manual details installation procedures and operational features of the Cerlic O2X
sensor. Menu navigation and technical data for the BB2 control box can be found in the
BB2 service manual
.
3.
Design
The O2X sensor is manufactured with 316SS (SS2343) stainless steel. The electrode is
a Clark-type, field-replaceable cartridge with an FEP Teflon membrane. The active
components included in the electrode are treated to maximize their life span. The
electrode is equipped with a temperature sensor that provides compensation features for
added stability. The electrode housing is made of PVC. An O-ring on the electrode
prevents water from leaking into the O2X. A six-pin connector of the back of the
electrode connects to the O2X.
Built- in flushing nozzles allow for the most accurate readings with little maintenance.
The electronics is protected in the rugged casing, ensuring its reliability in very
demanding environments.
The sensor has a fixed, shielded 10 m (33’) cable used for signal transmission between
the sensor and the BB2 control box. The cable sheath is made of Hytrel and is highly
resistant to aggressive materials and fluids.
4.
Measuring principle
The electrode is a Clark type electrode with a membrane in FEP. The Clark cell detects
the oxygen though its reduction at the Gold electrode. The sensor consists of a Gold
cathode and Silver anode. A membrane covers the two electrodes and blocks access of
most species to the electrodes. Only dissolved gases such as oxygen can traverse the
membrane, hence the reduction current responds to the oxygen concentration.
Active components included in the electrode are treated to maximize their life span.
Inside the electrode there is also a temperature sensor mounted in a way that minimizes
problems with temperature adjustments. This provides excellent compensation of the
electrode temperature instability. The electrode housing is made of PVC and is
equipped with an O-ring sealing against the mounting. There is a connector on the
electrode for the amplifier cable.
