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AlpHa Measurement Solutions |
Dissolved Oxygen (DO) in Research & Education

DO in Research & Education

The science of oxygen solubility (dissolved oxygen) and dependency is a fundamental teaching curriculum in secondary and post-secondary education and is applied throughout advanced research institutions. Its application spans multiple disciplines within chemistry, biology, and environmental studies. AlpHa’s dissolved oxygen (DO) sensors feature optical, polarographic, and galvanic sensing technology options suitable for research & education. These sensors provide the optimal combination of performance, durability, cost, and ease of use.

AlpHa offers the flexibility of supplying industry standard form factors for the entire DO sensing solution or simply a customized electrode, membrane cap, or optical sensing patch. DO solutions feature detection limits down to parts per billion (ppb) and measurement range options of 0 – 200% or 0 – 500% saturation. Output options include 20 mA or 0 – 5 V) or digital (RS-485 MODBUS RTU) formats.

Dissolved Oxygen (DO) in Research & Education

Optical

AlpHa's DO Sensor Capabilities

  • Range:
    • 0 – 20ppm (0 – 200% saturation)
    • 0 – 50ppm (0 – 500% saturation)
    • Adjustable within 0 – 50ppm
  • Response Time: T90 < ~35 seconds
  • Accuracy:
    • Dissolved Oxygen
      • 0 to 10 mg/L (±1%)
      • 10 to 20 mg/L (±2%)
      • 20 to 30 mg/L (±5%)
      • 30 to 50 mg/L (±15%)
    • Temperature: ±0.2°C
    • Pressure: ±0.2 kPa
  • Temperature Range: 0 to 50°C
  • Pressure: 
    • Operating Atmospheric Pressure: 40 to 115 kPa
    • Maximum Bearing Pressure: 700 kPa
  • Warranty: 6 to 24 Months Depending on Solution

Fiber and Patch Capabilities

  • AP Series
    • AP formulation is a highly stable sensor coating with zero drift. Designed for monitoring oxygen partial pressure in gas and dissolved oxygen concentration in liquids for biological environments. AP sensors are compatible with acidic as well as highly caustic environments. Overcoat options exist based on application.
  • HCR Series
    • HCR is a hydrocarbon-compatible formulation designed to monitor oxygen partial pressure in hydrocarbons such as fuels, organic solvents, oils, and alcohols. Overcoat options exist based on application.
 AP SeriesHCR Series
Response RateNo Overcoat: T90 ~1 secNo Overcoat: T90 ~1 sec
 White Overcoat: T90 ~1 minBlack Overcoat: T90 ~1 min
 Black Overcoat: T90 ~1 min 
Dynamic Range in Gas0 – 100% O2 / 0 – 760 mmHg O20 – 100% O2 / 0 – 760 mmHg O2
Dynamic Range in Water (DO)0 – 40 ppm (wt)0 – 40 ppm (wt)
Dynamic Range in Other Liquids0 to Oxygen Saturation Level0 to Oxygen Saturation Level
Resolution in Gas0.005% O2 / 0.04 mmHg0.05% O2 / 0.4 mmHg
Resolution in Water (DO)0.002 ppm (wt) / 2.0 ppb (wt)0.02 ppm (wt) / 20 ppb (wt)
Resolution in Other Liquids0.005% of Oxygen Saturation Level0.05% of Oxygen Saturation Level
Accuracy5% of Reading5% of Reading
Lowest Detectable Level (gas)0.005% O2 / 0.04 mmHg0.05% O2 / 0.4 mmHg
Lowest Detectable Level (water)0.002 ppm (wt) / 2.0 ppb (wt)0.1 ppm (wt) / 100 ppb (wt)
Lowest Detectable Level in Other Liquids0.005% of Oxygen Saturation Level0.25% of Oxygen Saturation Level
Sensor Drift0.002 O2% per Day0.001 O2% per Hour
Operating Temperature-50 to 80°C-50 to 120°C
Recommended Patch Replacement1 Year1 Year

Configuration Options

  • Optical DO Solutions
    • DOPO2 – Fiber Sensor
      • Fiber optic sensor for use with remote patches and the electro-optical module
    • Optical DO Sensor
      • Complete with Integrated Sensor Cap
      • Lumiphore Coating on Sensor Cap
      • Coating Options Available
    • BOD / CBOD Ready Optical DO
    • Patches
      • AP Series: Water samples, gas samples, and various matrices designed for biological applications
      • HCR Series: Hydrocarbon compatible applications (examples such as aviation fuels, gasoline, kerosene, toluene, acetone, UV curable ink, divinylbenzene (DVB), methyl methacrylate (MMA))
  • Form Factor
    • 12 mm
    • Process Body
    • Plastic Fiber Probe
    • Needle Probe
    • Dip Probe with Embedded Thermistor
    • Sensor Patch
    • Non-invasive Patch + Reflective Optical DO 
    • Cartridge 
    • Custom Options Available
  • Housing Material Options
    • Ryton® (PPS)
    • Kynar® (PVDF)
    • ABS
    • Polyethylene
    • PEEK
    • Semi-Disposable Plastic 
    • PVC / CPVC
    • Metal
      • Stainless Steel 
      • Other Metals Available 
  • Thermistor Options
    • 30 kohm 
    • Any commercially available thermistors and custom options
    • Common temperature accuracy is ±0.3°C and can vary based on thermistor option chosen
  • Integrated Insertions 
    • 3/4" NPT
    • 1" NPT
    • 1/2" NPT
    • BOD Bottle Adapter
    • Custom Options Available

Communication and Connection Options

  • Analog
    • 4 – 20 mA
    • 0 – 5 V
    • Custom Options Available
  • Digital
    • RS-485 MODBUS RTU
    • Custom Options Available 
  • Connectors with Cables
    • DIN
    • Tinned Leads
    • SMA (fiber optic probes)
    • Circular Connectors
    • LEMO
    • BNC
    • Spade Lugs
    • MOLEX
    • Mil-spec
    • 2.5 mm / 3.5 mm phono
    • RCA
    • Any commercially available connectors and custom options

Electrochemical

  • Range:
    • 0 – 20 mg/L  (0 – 200% saturation)
    • 0 – 50 mg/L  (0 – 500% saturation) 
  • Response Time: T90 < 35 Seconds 
  • Accuracy: ±2%
  • Temperature Range: 
    • 0 – 50°C Continuously Monitored
    • 0 – 80°C Grab Sample
  • Warranty: 12 Months
  • Technology
    • Polarographic
      • Platinum Cathode / Silver Anode, Teflon Membrane
    • Galvanic
      • Platinum Cathode / Lead Anode, Teflon Membrane
      • Silver Cathode / Zinc Anode, Teflon Membrane
  • Form Factor 
    • Process Body
    • 12 mm
    • Cartridge
    • Custom Options Available
  • Housing Material Options
    • ABS
    • Epoxy
    • Ryton® (PPS)
    • Polycarbonate
    • PVC / CPVC
    • Custom Options Available 
  • Thermistor Options
    • PT100 (type A & B)
    • PT1000
    • 10 kohm
    • 30 kohm
    • 100 kohm
    • Any commercially available thermistors and custom options
    • Common temperature accuracy is ±0.3°C and can vary based on thermistor option chosen
  • Integrated Insertions 
    • 3/4" NPT
    • 1/2" NPT
    • 1" NPT
    • PG 13.5
    • Custom Options Available
  • Analog
    • Nanoamperes (nA)
    • Millivolts (mV)
    • Custom Options Available
  • Connectors & Cables
    • Integrated Connectors (detachable or cableless)
      • Variopin
      • S7
      • S8
      • BNC 
      • Custom Options Available 
    • Connectors with Cables (including temperature)
      • DIN
      • Circular Connectors
      • LEMO
      • Tinned Leads
      • Mil-spec
      • BNC
      • SMA
      • Spade Lugs
      • MOLEX
      • 2.5 mm / 3.5 mm phono
      • RCA
      • Any commercially available connectors and custom options

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