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SWAN dissolved oxygen sensor and service parts — choosing the right part number
Covers the Swansensor Oxytrace G sensor and its service kit — common spare parts and maintenance intervals for SWAN AMI systems.
Routine maintenance of the SWAN AMI Oxytrace dissolved oxygen analyzer centers on two parts: the Swansensor Oxytrace G sensor (part no. A-87-212-052) and the sensor service kit (part no. A-87.219.010). The sensor contains a three-electrode system (cathode, anode, guard electrode) and a built-in temperature sensor; the service kit includes a replacement sensor cap, electrolyte bottle and seals. Used together, they keep trace dissolved oxygen measurement in ultrapure water at 0.01 ppb resolution.
AMI Oxytrace system and the role of each part
SWAN Analytische Instrumente AG makes online water quality analyzers. The AMI Oxytrace series is designed for continuous monitoring of trace dissolved oxygen in ultrapure water and is widely used in power plant feedwater circuits, semiconductor fab ultrapure water systems and pharmaceutical water monitoring. The system consists of three main parts: transmitter, sensor and flow cell. The key maintenance parts are the sensor and its service kit.
Common part numbers
SWAN Oxytrace part numbers start with A-87, with different suffixes for different components. The two core parts on this page, plus a common spare from the same series for cross-checking when ordering:
| Part no. | Description | Use | Replacement guide |
|---|---|---|---|
| A-87-212-052 | Swansensor Oxytrace G sensor | Three-electrode dissolved oxygen sensor: cathode (gold/platinum), anode (Ag/AgCl), guard electrode and built-in NT5k temperature sensor | Typically 2–3 years for the complete sensor, depending on use |
| A-87.219.010 | Oxytrace SC service kit | Replacement sensor cap (pre-mounted membrane), electrolyte bottle and seals, for maintenance without replacing the whole sensor | Every 6–12 months (depending on water conditions) |
| A-87.290.050 | Oxytrace G sensor cap | Sensor cap with pre-mounted membrane and electrolyte bottle, for when only the cap needs replacing | Same interval as the service kit |
Ordering note: SWAN recommends using only its own spare parts and consumables; other parts may affect measurement accuracy. When ordering, confirm that the sensor cable length (1 m / 5 m / 10 m / 15 m) suits the installation distance.
Oxytrace G sensor technology
The Swansensor Oxytrace G uses the Clark cell (electrochemical oxygen cell) principle with a three-electrode design for trace dissolved oxygen measurement: a cathode (precious metal such as gold or platinum), an anode (Ag/AgCl reference electrode) and a guard electrode (silver guard). The guard electrode speeds up initial stabilization and eliminates zero current, greatly shortening recovery time after maintenance.
Technical data
| Item | Details |
|---|---|
| Measuring principle | Three-electrode Clark cell (electrochemical) |
| Measuring range (25 °C) | 0.01 ppb – 20 ppm O₂, or 0–200% saturation |
| Resolution | 0.01 ppb (low range) / 0.01 ppm (high range) |
| Response time | ≈120 s (air → 100 ppb); ≈270 s (air → 10 ppb) |
| Temperature compensation | Built-in NT5k temperature sensor, automatic |
| Pressure compensation | Automatic air pressure compensation |
| Min. flow velocity | 50 cm/s |
| Max. operating pressure | 3 bar (B-Flow flow cell) |
| Cable length options | 1 m / 5 m / 10 m / 15 m |
Selection summary
| Aspect | Key consideration |
|---|---|
| Applications | Power plant feedwater/condensate, semiconductor ultrapure water, pharmaceutical purified water — all need trace (ppb-level) dissolved oxygen monitoring |
| Sensor cable length | Choose 1 m / 5 m / 10 m / 15 m by the distance from the installation point to the transmitter; measure before running cables |
| Spares strategy | Keep 1–2 service kits (A-87.219.010) on hand so maintenance does not wait for parts |
| Flow cell | QV-Flow PMMA (acrylic, with flow meter) for general water; B-Flow SS316L (stainless steel) for high-pressure or corrosive samples |
| Faraday verification | The AMI Oxytrace QED version supports automatic verification with a Faraday electrode; check the transmitter version if you need this function |
Ordering tip: if your plant runs several SWAN analyzer systems (for example AMI CODES II disinfectant monitoring and AMI Oxytrace dissolved oxygen monitoring), you can consolidate consumables and spare parts with us to simplify purchasing and keep part numbers correct. For help confirming SWAN part numbers, email us.
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