Ocean Optics - Inventor of the World's First Miniature Spectrometer
Ocean Optics - Inventor of the World's First Miniature Spectrometer
 

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Ocean Optics - Inventor of the World's First Miniature Spectrometer

 

Sensor Coating Formulations

FOXY Coating Formulation

Our Oxygen Sensing Probes with the FOXY Formulation applied are designed for monitoring partial pressure of oxygen in benign gasses and aqueous liquids. Standard FOXY probe tips are covered with a layer of hydrophobic sol-gel material with a ruthenium compound trapped in the sol-gel matrix. When excited by an LED, the ruthenium complex fluoresces. If the excited ruthenium complex then encounters an oxygen molecule, the excess energy quenches the fluorescent signal. The fluorescence intensity or phase shift is measured by an Ocean Optics spectrometer or MFPF system, and is related to the partial pressure of oxygen.

FOSPOR Coating Formulation

The FOSPOR coating is applied to the distal end of the fiber and has a fluorescence-based Pt-porphyrin indicator. The sensor uses fluorescence quenching of the porphyrin to measure the partial pressure of dissolved or gaseous oxygen. The FOSPOR coating can be applied to substrates other than fibers and probes and used for applications such as through-packaging measurements in the food and pharmaceutical industries. *Please contact an Applications Scientist before specifying FOSPOR or other coatings.

HIOXY Coating Formulation

Two years of research and development pursuing a high-performance oxygen sensor compatible with hydrocarbon environments has resulted in our new HIOXY sensor. The HIOXY sensor is designed for monitoring oxygen partial pressure in non-aqueous vapors and solutions. The sensor coating chemistry is ideal for use with oils, alcohols and hydrocarbon-based vapors and liquids. HIOXY has been tested successfully in commercial and military aviation fuels, gasoline, diesel, some alcohols, glycol, military hydraulic fluids and wine analysis.

Choosing a Probe

Once you choose the best Sensor Coating Formulation for your application, you need to select the fiber optic probe onto which the sensor coating is applied. For a list of fiber optic probes, click here.

Sensor Coating Specifications

Specification FOXY Probes FOSPOR Probes HIOXY Probes
Principle Photoluminescence-quenching using Ru compound. Measures O2 partial pressure. Photoluminescence-quenching using Pt compound. Measures O2 partial pressure. Photoluminescence-quenching using Ru compound. Measures O2 partial pressure.
Sensor mechanism

Phase shift due to change in partial pressure of O2

 Phase shift due to change in partial pressure of O2 Phase shift due to change in partial pressure of O2
Applications Benign environment, aqueous liquids and vapors Low O2 (0–5%), vacuum systems packaging, benign environment Hydrocarbon-based liquids and vapors, fuels, alcoholic beverages, vegetable oil
Time-constant (µsec) dynamic range Air: 2.50, N2: 5.00; Low 1.00, High 7.00 Air: 10.00; N2: 50.00; Low: 3.00, High: 70.00 Air: 0.50, N2: 2.50; Low: 0.30, High: 6.00
Accuracy: (0–20% O2, 0–50ºC) <5% of reading (using polynomial fit to multipoint calibration) <5% of reading (using polynomial fit to multipoint calibration) <5% of reading (using polynomial fit to multipoint calibration)
Response time of probe with no overcoat <1 second in gas, 30-45 seconds in liquid <30-60 seconds in gas, 60-90 seconds in liquid <1 second in gas, 30-45 seconds in liquid
Response time of dissolved oxygen in liquid (with overcoat) 30-45 seconds 30-45 seconds Overcoat not required
Response time of probe with Overcoat of Oxygen Gas (at 1 atmosphere) 15-20 seconds 15-20 seconds Overcoat not required
Dynamic range of Dissolved Oxygen in liquid 0–40.7 ppm; 0–760 mm Hg partial pressure 0–40.7 ppm; 0–760 mm Hg partial pressure 0–40.7 ppm; 0–760 mm Hg partial pressure
Dynamic range of Oxygen Gas (at 1 atmosphere) 0–100% (mole percent); 0–760 mm Hg partial pressure 0–<10% (mole percent); 0–760 mm Hg partial pressure 0–20.9% (mole percent); 0–760 mm Hg partial pressure
Stability Dissolved Oxygen in liquid Drift<0.01 ppm per hour Drift < 0.00008 ppm O2 per hour at low dissolved oxygen; Drift ~ 0.006 ppm O2 per hour in air-saturated water Drift<0.002 ppm per hour
Stability Oxygen Gas (at 1 atmosphere) Drift ~0.03% O2 per hour Drift ~ 0.0002% O2 drift per hour at low O2; Drift ~ 0.015% O2 per hour air

Drift ~0.01% O2 per hour
Resolution of Dissolved Oxygen in liquid 0.02 ppm at room temperature 0.002 ppm at room temperature 0.02 ppm at room temperature
Resolution of Oxygen Gas (at 1 atmosphere) 0.05% (0.4 mmHg) at room temperature 0.005% at room temperature 0.05% (0.4 mmHg) at room temperature
Lowest detectable limit of Dissolved Oxygen in liquid 0.02 ppm 0.002 ppm at room temperature 0.02 ppm
Lowest detectable limit of oxygen gas (at 1 atmosphere) 0.05% (0.4 mm Hg) 0.005% (0.04 mm Hg) 0.05% (0.4 mm Hg)
Overcoat available Yes, order FOXY-AF or FOXY-AF-MG Yes No overcoat available
Temperature range -50ºC to +80ºC 0ºC to +60ºC -50ºC to +60ºC
Temperature Temperature sensor and software-supported compensation Temperature sensor and software-supported compensation Temperature sensor and software-supported compensation
Temperature recalibration Only when probe is replaced/refurbished Only when probe is replaced/refurbished Only when probe is replaced/refurbished
Probe lifetime Reconditioning recommended once per year Reconditioning recommended once per year Reconditioning recommended once per year

 

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