Aqualyzer® 9061 Dissolved Oxygen Analyzer




Waltron Dissolved Oxygen Analyzer in Water

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The Waltron AQUALYZER® 9061 Dissolved Oxygen Analyzer is a state-of-the-art microprocessor-based instrumentation package developed specifically for use in measuring low and high concentrations of dissolved oxygen. It is today’s standard for all low range dissolved oxygen analyzers.

True Fully Automatic Calibration
Calibration is carried out automatically online and involves no manual operation.An automatic calibration check is performed at a predetermined frequency by the instrument; however, calibration can be initiated at any time manually if needed.

Wide range analysis: 0.01ppb – 20ppm   Minimal analyzer maintenance
Very low cost,no maintenance sensor with two-year pro-rated warranty   Automatic operation
Zero offset feature for higher accuracy at low levels   No sensor maintenance
True fully automatic on-line calibration    
Two 4-20 MA isolated current outputs    
User-configurable system:oxygenated or deaerated    
User-configurable system: oxygenated or
Automatically stores last 10 calibrations and alarm logs    
Sensor protection from extreme temperatures    
Automatic temperature compensation
Range   0-1000 ppb,0-20 ppm with automatic range selection.

± 1 ppb


± 5% of reading or ± 2 ppb per week, whichever is greater

Response Time  

90% of a step change in less than three minutes


± 0.5 ppb

Temperature Compensation  

Automatic,reduces sample temperature error to less than 0.5% of reading per degree C



Manual and fully automatic calibration. Manual initiated by operator; automatic with programmable frequency in days.

Current Outputs  

Two isolated 4-20mA current (analog) outputs.

Digital Output   Communication interface via RS-232 and RS-485 using MODBUS RTU protocol

Three voltage-free contacts. Alarm points set from transmitter rated at 2A,250VAC (non-inductive

Response Time   90%of a step change in 60 second
Atmospheric Pressure

Preset to normal atmospheric pressure at sea level and programmable

Thermal Protection   Automatic sample bypass if sample exceeds 131°F (55°C)
Power   90VAC-250VAC, wide range of input power supply
CE Certification (on request)   Meets low voltage and low electromagnetic compatibility directives
Operating Conditions
Sample Flow   100 – 300 ml/min
Sample Temperature   41 – 131° F (5 – 55°C)
Ambient Temperature   32 – 131° F (0 – 55°C)
Pressure   5–30 psig (0.35 – 2.07 bar)
  Water sample filtering to 60 micron

Transmitter – high strength ABS, IP65 (NEMA 4x) 
Wet section – high strength ABS and sheet metal, all wetted parts stainless steel or PVC, IP55 (NEMA 4)

Dimensions   Transmitter:Height = 10.92” (27.74 cm), Width = 7” (17.78 cm), Depth = 3.54” (8.99 cm)
Wet Section: Height = 18.25” (46.36 cm) including drain, Width = 11.25” (28.58 cm), Depth = 7.63” (19.38 cm)

Four key-style holes: Height = 0.86” (2.18 cm), Top Width = 0.281” (0.714 cm), Radius = 0.28” (0.711 cm) Horizontal: 9” (22.86 cm), Vertical: 12.875” (32.70 cm)

Weight   23 lbs. (10.44 kg)
Wiring   Eight (8) conduit knockouts

Sample Inlet: 1/4' (0.635 cm) OD Swagelokt, Drain: 3/8' (0.953 cm) OD tube


Up to 325 feet (100 meters) on request

Finish   Corrosion resistant

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