Continuously Measure O₂ and Adjust Chemical Dosing
 
OxyGUARD continuously measures the O₂ content of hot, thermally deaerated boiler feedwater in-line. Dosing of the chemical oxygen scavenger can be controlled according to demand based on the measured O₂ content.
 
Measuring Principle
 
The OXYTRANS TR-E oxygen monitoring sensor measures O₂ optically. An optical window containing indicator molecules is excited; oxygen changes the detected signal. Measurement requires no replacement of electrolyte or membrane.
 
Applications
 
 
 
Hot Boiler Feedwater
 
 
Thermal Deaeration
 
 
Steam Boiler
 
 
O₂ Scavenger
 
 
Chemical Dosing
 
 
Surface Blowdown
 
 
Bottom Blowdown
 
 
Corrosion Protection
 
 
Demand-based dosing is intended to reduce the energy losses associated with the usual surface and bottom blowdown losses of 3 - 5 %.
 
Technical Data
 
Measuring Range, Liquid Phase: I) 1 ppb - 2 ppm
 
Accuracy, Liquid Phase: I) ± 1 ppb
 
Response Time: t90 ≤ 10 s
 
Operating Pressure: max. 12 bar
 
Operating Temperature: Standard -5 to +55 °C (Pt100)
optional: max. +98 °C
+98 to +110 °C: reduced accuracy
 
Material: 1.4404 / AISI 316L, silicone (FDA), PTFE (FDA)
 
Input: 1 x analog (4 - 20 mA) & 3 x digital (24 VDC)
 
Output / Fieldbus: 2 x analog (4 - 20 mA) & 3 x digital (24 VDC)
optional: PROFIBUS DP & PROFINET
 
Enclosure Rating: IP65
 
Power Supply: 24 VDC
 
Optical Technology: No replacement of electrolyte or membrane.
 
Short Response Time: t90 ≤ 10 s and high long-term stability.
 
High Temperatures: Designed for applications at high temperatures.