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Bare Fiber Oxygen Sensors

  • Optical oxygen sensors
  • Microsensors & minisensors
  • Original REDFLASH technology
  • Flexible fiber allows application in complex geometries
  • Works in gas (%O2) and in liquids (DO)
  • No oxygen consumption
  • Response times down to <0.3 s
  • >3 years shelf time
  • Optional underwater / deep sea versions
  • Optional trace oxygen versions

These fiber-optic oxygen sensors offer unprecedented fast response times (down to <<1s) combined with high spatial resolution (down to 30-50µm tip diameter). They are based on optical detection principles (REDFLASH technology). The bare fiber oxygen sensors are principally identical to our Retractable Needle-Type oxygen sensors, but they come without any sensor housing.

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They comprise only the bare optical fiber with the REDFLASH-dye fixed on the fiber tip. They assure very precise measurements, as they do not consume any oxygen and show no stirring sensitivity. Furthermore, they come with an extremely long shelf time of >3 years. The flexible sensing tips of the bare-fiber oxygen sensors allow their application in complex geometries, or for almost non-destructive intrusion into biological samples ("implantable oxygen sensors").

Trace range versions. Special trace range versions are available for high precision measurements close to 0%O2. They offer about 5x higher resolution compared to the normal range oxygen sensors. The recommended measuring range is 0-10% O2. However, calibration at ambient air (21% O2) is possible, ensuring a straightforward calibration without the need of special calibration standards.

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Compatible oxygen meters

FireStingO2 (FSO2-x)
FireStingGO2 (FSGO2)
FireStingO2-Mini (FSO2-MINI-ST)
FireStingO2-SubPort (FSO2-SUBPORT) for sensors with underwater connectors (option -SUB)

Normal Range Versions

Item No. Description
(Tip Diameter)
Response
Time (s)**
Pricing
in EU*
OXB50 Bare Fiber Oxygen Microsensor
(ca. 40-60µm)
<2 s (liquid)
<1 s (gas)
220 €
OXB50-HS Bare Fiber Oxygen Microsensor
(ca. 40-60µm), high speed
<0.8s (liquid)
<0.8s (gas)
250 €
OXB50-UHS Bare Fiber Oxygen Microsensor
(ca. 40-60µm), ultra high speed
<0.3s (liquid)
<0.3s (gas)
280 €
OXB230 Bare Fiber Oxygen Minisensor
(230 µm)
<2 s (liquid)
<1 s (gas)
260 €
OXB430 Bare Fiber Oxygen Minisensor
(430 µm)
<2 s (liquid)
<1 s (gas)
260 €
OXB430-HS Bare Fiber Oxygen Minisensor
(430 µm), high speed
<0.8 s (liquid)
<0.8 s (gas)
290 €
OXB430-UHS Bare Fiber Oxygen Minisensor
(430 µm), ultra high speed
<0.3 s (liquid)
<0.3 s (gas)
320 €
OXB50-OI Bare Fiber Oxygen Microsensor
(ca.40-60µm), optical isolation
<3 s (liquid)
<2 s (gas)
280 €
OXB230-OI Bare Fiber Oxygen Minisensor
(230 µm), optical isolation
<10 s (liquid)
<4 s (gas)
320 €
OXB430-OI Bare Fiber Oxygen Minisensor
(430 µm), optical isolation
<10 s (liquid)
<6 s (gas)
320 €

Trace Range Versions

Item No. Description
(Tip Diameter)
Response
Time (s)**
Pricing
in EU*
TROXB430 Bare Fiber Trace Oxygen Minisensor
(430 µm)
<15 s (liquid)
<2 s (gas)
260 €

* Only EU-Prices shown. Contact us for pricing outside EU. Not for resale.

** Typical response times for 90% signal change (T90).
     For liquids: measured for the transition from air into a stirred solution of 1% Na2SO3.

Options

Item No. Extension Description Extra Charge
-CL4 Cable length of ca. 4m (instead of standard 2m cable length) add 30 €
-OI Black optical isolation on the very sensor tip. Recommended for applications with intense background illumination (e.g. direct sun light) or for media with strong luminescent properties (e.g. very dense algae cultures). Refer to the tables above for available sensor versions. see above
-HS High speed. Selected sensors with fast response times. Refer to the tables above for available sensor versions. see above
-UHS Ultra high speed. Selected sensors with very fast response times. Refer to the tables above for available sensor versions. see above
-SUB Underwater connector (instead of standard ST-connector) needed for applications with the underwater OEM-solution FireStingO2-SubPort. Contact us for available sensor versions. no extra charge
-CLx Custom cable length of x meter (max. 20m) on request
-AxBy Custom stripping lengths with A= x mm and B= y mm (see drawing below) (2mm <= A <= 30mm, 8mm <= B <= 500mm) on request


Example
: Item no. OXB430-HS-CL4-SUB designates a high speed minisensor with 4m cable and underwater connector.

Tip Geometries

True to scale drawings with outer jacket (orange/brown), plastic coating (grey), optical fiber (pink) and oxygen sensitive REDFLASH dye (green).

Stripping lengths: A = 20mm, B = 100mm (other stripping lengths optional)



Specifications

Given for 2-point calibrated oxygen sensors at 1013mbar absolute pressure.

Normal range versions hPa %O2 %air sat. mg/L
Optimum measuring range 0-500 0-50 0-250 0-23
Maximum measuring range (not specified) 0-1000 0-100 0-500 0-45
Detection limit 0.2 0.02 0.1 0.01
Resolution at 1% O2 0.1 0.01 0.05 0.005
Resolution at 20% O2 0.5 0.05 0.25 0.025
Accuracy at 1% O2 ±0.2 ±0.02 ±0.1 ±0.01
Accuracy at 20% O2 ±2 ±0.2 ±1 ±0.1
 
Trace range versions hPa %O2 %air sat. mg/L
Optimum measuring range 0-100 0-10 0-50 0-5
Maximum measuring range (not specified) 0-210 0-21 0-100 0-9
Detection limit 0.05 0.005 0.02 0.002
Resolution at 0.2% O2 0.02 0.002 0.01 0.001
Accuracy at 0.2% O2 typ. 2% of reading, but not better than 0.01%O2
All versions
Temperature range 0 to 50°C (specified), -20 to 70°C (not specified)
Minimum lifetime 1,000,000 data points
Application areas Laboratory, industry, research. Not for medical or any other safety-critical applications. Not for application in humans or in food intended for human consumption.
Compatibility Gas-phase, aqueous solutions, ethanol, methanol, isopropanol (note: the optional optical isolation (-OI) is not compatible to ethanol, methanol, isopropanol)
Cross sensitivity Other organic solvents, chlorine
No cross sensitivity pH 1-14, CH4, CO2, H2S, any ionic species
Sterilization Ethylene oxide (EtO), 70% ethanol, 70% isopropanol
Cleaning 3 % H2O2, ethanol, soap solution
Storage time >3 years in darkness at room temperature
Calibration Single point, two point calibration
Connector ST-plug (optional: underwater connector)
Cable length 2m or 4m (standard), optional up to 20m