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Dissolved Oxygen

ZÜLLIG Dissolved Oxygen Probe

The ZÜLLIG D.O. sensor is a precision probe which provides fast and accurate D.O. control for the needs of a modern process control application. It operates without a membrane, which eliminates time delays and wasted aeration costs caused by membrane fouling effects. Even fats and oils do not limit its use. It uses a diamond grindstone to continuously clean the heavy duty anode and cathode. Maintenance is limited to very occasional adjustments to electrode tension, reducing maintenance and drift. Mounting is normally at depth rather than on the surface to ensure the most representative reading. Customers consistently report faster more accurate control of D.O. with lower O2/kg BOD removed and better plant performance.

Specifications

Measuring Range	Iron anode; 0 to 15 mg/L Zinc anode; 0 to 25 mg/L
Temperature Range	0 to 45 oC
Mains Power	230 VAC; +10/-15%
Analog Outputs	Current (0/4 to 20 mA)
Housing	IP66
Displayed Variables	DO (mg/L); Temperature (oC); %Saturation
Alarm	Potential free relay contact
2 Limit Contacts	Potential free relay contact
Computer Interface	RS 232 or RS 485
Optimal Controller	B-Line

Dimensions

DISSOLVED OXYGEN PROBE click for a larger view

Dissolved Oxygen Graph from IDEA STP (showing 3 consecutive days)

Application Papers

Superior DO Control with Zullig Probes Reduces Aeration Costs at STP's

Excellent aeration control is essential for the efficient operation of a modern Sewage Treatment Plant (STP).

The real cost of inaccurate and varying DO measurement includes :

• wasted aeration power
• reduced nutrient removal efficiency
• poor effluent quality
• possible excessive chemical use for pH and P removal

Read more...

Simple Method for the Demonstation of DO Membrane Fouling and it's Impact on STP's

Fouling of membranes in Membrane D.O. probes can be demonstrated using a simple test. A D.O. sensor that reads low is likely to cause over aeration of the wastewater and cost money.

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Success Story from Australia

Dissolved Oxygen Control in Industrial Waste Water Treatment.  The cost of buying the Züllig sensors was paid back in 10 weeks...

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Advanced Optimization of Biological Nutrient Removal Plants Using Feedforward and Feedback Control - Case Studies

The performance of a wastewater treatment plant can be improved quite easily. Using advanced process control techniques, processes are improved and contentration of discharged components decreased.

Read more...

The s::can oxi::lyser - Optical Oxigen - Plug & Measure

Applications for Waste Water

• Industrial Waste Monitoring (influent, aeration tank, effluent)
• Providing measurement in concentrated industrial waste through to final effluent mf/RO applications
• Inlet load monitoring to indutrial and municipal WWTP's
• Feed forward control of chemical dosing to DAF and other treatment processes
• Control of carbon dosing and denitrification systems
• Monitoring for compliance of discharges to the environment.

Features

• Plug & Measure
• Long-Term-Stability
• Works-Calibrated
• In-situ & online monitoring
• Automatic cleaning device using compressed air
• Almost zero maintenance
• No flow rate required
• Requires no chemicals
• Portable
• On board data logging
• Simple data transfer to Excel
• Auto compensation: Temperature

Specifications

oxi::lyser
Measuring principle	Fluorescence quenching
Measuring range	0.0 to 25.0 ppm
Sensor cable	4 conductor, 22 AWG, Polyurethane jacket
Dimensions	48mm x 150mm
Weight	appr. 350g w/o cable
Response time	1 minute
Ambient conditions	0 - 60'C, 6 bar pressure
con::stat
Display	Full colour back-lit touch-screen display of current values, spectral fingerprint and historic trends
Signal Output-expandable	1.  Four analog outputs 2.  Six digital outputs 3.  Analog and digital input 4.  RS 485 TCP/IP RS232 as required
Range	1.  <0.1 mg/l to 260 mg/l Nitrate as N 2.  DOC levels from ppb to 10,000mg/l COD 3.  0.001 equiv FTU to 5000 mg/l solids via variable path length modules
Supply voltage	230V AC or 10 - 30V DC at 50 watts maximum Note:  integral user selectable timed sleep mode
Housing	IP65

Installation Options

• Bypass
• Pipe
• Channel
• Tank
• In-bore
• Submerged
• Sewer
  

Application Papers