Transmitter AMU Oxytrace
In Steam and Water Circuit temperature of water is increased from room temperature to superheated steam temperatures. In temperature range of 200to 250°C (feed water), dissolved oxygen causes corrosion of components and piping. Iron reacts with dissolved oxygen in feed water circuit resulting pitting may eventually cause puncturing and failures of Parts in Steam water circuits. Parts like condensers, Low Pressure Heaters (LPH), Feed water tanks, High pressure Heaters and Economizers need to be protected from dissolved oxygen attack. Dissolved oxygen also promotes electrolytic action between dissimilar metals causing corrosion and leakage at joints and gaskets.
In power plants various feed water treatments like :
(1) All Volatile Treatment (AVT-R or AVT-O)
(2) Oxygenated Treatment (OT)
(3) Combine Water Treatment (CWT)
are adopted to minimize corrossion.
Thus it is very importan and critical to monitor and control Dissolved oxygen and pH values in Feed water systems.
The typical points in steam circuit where dissolved oxygen monitoring is required are . Condenser outlet, L.P. heaters, Economizer inlet.
AMU Oxytrace is single channel Panel mounted 4-wire pH transmitter from SWAN Switzerland. This Transmitter is available with Freely programable Analog Output as well as Relay Board and RS-485 Modbus or Profibus Option
- Sensor connections for Oxytrace G oxygen sensor with integrated NT5k temperature probe and for a digital sample flow meter
- Two potential free contacts programmable as a limit switch or PID-control
- Input for potential free contact to freeze the measuring value or to interrupt control in automated installations(hold function or remote-off)
- Automatic compensation of temperature and air pressure
- Easy user menus in English, German, French and Spanish. Simple programming of all parameters by keypad
- Data logger for 1,500 data records stored at a selectable interval. Serial interface included for data download to PC with Microsoft Hyper Terminal.
- Overvoltage protection for in- and outputs
- Two current outputs (0/4 – 20 mA) for measured signals.
- Potential free alarm contact as summary alarm indication for programmable alarm values and for instrument faults
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