Optical oxygen measurement in power plants

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LDO Technology: accuracy with minimal maintenance 

Hach LDO technology (Luminescent Dissolved Oxygen) has proven itself by tens of thousands installed instruments in many industries. The LDO technology:

  • Saves significant time and makes the sensors virtually maintenance free as there are no electrolytes, no electrodes and no membranes to replace
  • Provides highly accurate and stable measurements

Unlike electrochemical sensors, LDO sensors do not consume oxygen and do not require frequent cleaning or frequent calibration, which results in longer sensor life and more stable, accurate readings.

The LDO technology has  been included in the catalogue of ASTM standards.

Optical vs. Amperometric oxygen sensors
The trade journal VGB PowerTech published an article in September 2012 that compared and discussed the performance of optical and amperometric oxygen sensors in the power plant sector.


Read the full report here

Find out how you can benefit from the LDO technology. Call us or fill out the request form today.



The ORBISPHERE K1100 is the first optical oxygen sensor for power plants. Offers significant operating and cost benefits:


  • Fast response and annual calibration
  • High accuracy in ppb range for effective proces control
  • Optical technology eliminates membrane and electrolyte to minimize maintenance

 

The ORBISPHERE 3100 portable oxygen analyser offers quick and easy dissolved oxygen monitoring at various measurement spots throughout the plant.

  • Real data confidence for process efficiency
  • Robust design that endures harsh environments
  • Fast response time and accurate measurements
  • Multiple applications: validation tool, calibration of online sensors, early leak detection and backup unit

 

 

An active fluorescent spot (1) is excited with blue light (2) and a red luminescent light (3) is detected by the photo diode (5). The presence of oxygen changes the rate of fluorescence decay and phase shift which directly relates to the oxygen partial pressure.
 
The reference LED (4) emits red light pulses of known characteristic onto the fluorescent spot (1), which is detected by the photo diode (5) and used as a reference signal.



 

Die Spektralphotometer DR 3900 VIS und DR 6000 UV-VIS wurden entwickelt, um eine hervorragende Analysegenauigkeit bei einfacher Handhabung der Tests zu erreichen.

Ihre Vorteile:
  • Hohe Effizienz im Labor – mehr als 220 direkt verfügbare, vorprogrammierte Analysemethoden
  • Sehr genaue, zuverlässige und nachvollziehbare Messungen
  • Einfacher und transparenter Arbeitsprozess

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Stellen Sie sicher, dass Ihre Anlage effizient arbeitet und die Wasserqualität das ganze Jahr ohne außerplanmäßige Ausfallzeiten überwacht wird.
Für Messgeräte ist die Wartung genauso wichtig wie die Inspektion für ein Auto:  sie spart  auf Dauer nicht nur Geld, sondern garantiert einen störungsfreien Einsatz und zuverlässige Messergebnisse.

Wir bieten flexible Wartungsverträge, die auf Ihre Bedürfnisse angepasst sind, sowie die Möglichkeit, die Gewährleistung auf bis zu 5 Jahre zu verlängern.

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Hach expertise covers:

  • Water intake
  • Demineralisation
  • Feed/make-up water
  • Boiler feed water
  • Steam/condensate
  • Condensate polishing
  • Cooling water
  • Reactor coolant (nuclear)
  • Stator coolant
  • Nuclear waste/off-gas
  • Wastewater treatment