Riken Keiki OS-B7 Oxygen Sensor
$379.00
Condition: New – Open Box
1 in stock
Riken Keiki OS-B7 Galvanic Oxygen Sensor
The Riken Keiki OS-B7 is a galvanic electrochemical oxygen sensor engineered specifically for demanding marine and heavy industrial gas detection instruments. Built by Riken Keiki Co., Ltd., the OS-B7 cell delivers highly stable, fast-acting volumetric oxygen measurement in harsh atmospheres, including cargo tanks, inert gas systems (IGS), pump rooms, double hulls, and marine enclosed spaces.
Operating on a lead-oxygen galvanic electrochemical reaction, the OS-B7 requires no external polarization voltage, generating an electrical current output linearly proportional to the partial pressure of oxygen in the target environment.
Model Details
- Manufacturer: Riken Keiki Co., Ltd. (Japan) / RKI Instruments
- Model: OS-B7
- MPN / Part Number: OS-B7 (Standard OEM Part No. 65-0601RK / OS-B7-RK Series)
- Measurement Principle: Galvanic Electrochemical Cell (Lead-Acid Microcell Electrolyte)
- Target Gas: Atmospheric Oxygen O2
Technical Specifications: Riken Keiki OS-B7 Oxygen Sensor
| Parameter | Specification Value / Engineering Unit |
|---|---|
| Sensor Type | Electrochemical Galvanic Cell |
| Target Gas | Oxygen (Oâ‚‚) |
| Standard Detection Range | 0.0 to 25.0% vol (Extended: up to 40.0% vol) |
| Output Signal (in 20.9% Oâ‚‚) | 9.0 mV to 14.0 mV (model-circuit specific nominal) |
| Zero Offset Voltage | ≤ 0.1 mV (in 100% N₂ atmosphere) |
| Response Time (T90) | ≤ 15 seconds (at 20°C standard airflow) |
| Repeatability & Linearity | ±0.5% O₂ full scale / Linear across entire operational band |
| Operating Temperature Range | -20°C to +50°C (-4°F to 122°F) continuous |
| Operating Relative Humidity | 0 to 95% RH non-condensing |
| Pressure Coefficient Range | Atmospheric pressure ±10% (80 kPa to 120 kPa) |
| Terminal Allocations / Connection | Polarized 2-pin / Concentric PCB Pad Contact (Gold Plated) |
| Expected Operational Life | 18 to 24 months in fresh air at 25°C |
| Storage Temperature & Shelf Life | 0°C to +20°C (32°F to 68°F); Maximum shelf life: 6 months sealed |
Key Features
- Self-Powered Galvanic Architecture: Operates without external bias voltage, producing a linear analog millivolt/microamp output directly correlated to ambient oxygen concentration.
- Acid-Gas Resistance: Formulated to withstand trace concentrations of acidic combustion gases common in marine inert gas systems and exhaust lines without rapid signal degradation.
- Direct Drop-In Mechanical Compatibility: Gold-plated mating contact pins provide corrosion-resistant, low-resistance continuity across high-vibration marine environments.
- Long Operating Lifespan: Optimized electrolyte volume and robust anode formulation yield an operational lifespan of 18 to 24 months under standard operating conditions.
Compatible Gas Detector Models
- Riken Keiki RX-Series: RX-415, RX-515, RX-517, RX-8000 Portable Marine Analyzers
- Riken Keiki GX-Series: Select configurations of GX-2001, GX-2009, GX-2012, GX-8000 multi-gas detectors
- RKI Instruments: Marine Tanker Sampling Sets, Eagle & Eagle 2 Series (where OS-B series sub-variants are designated)
- Fixed Gas Detection Sample Draw Units: Marine inert gas generator sampling blocks, pump room continuous air draw cabinets.
Industrial & Marine Applications
- Crude Oil / Chemical Tanker Cargo Holds: Verifying oxygen levels prior to tank washing, gas-freeing, or hot work per SOLAS Chapter II-2.
- Inert Gas Systems (IGS): Monitoring scrubber and deck seal discharge to verify O2 concentrations remain below critical flammability limits.
- Ballast & Double Hull Tanks: Pre-entry atmospheric testing for vessel inspection and maintenance crews.
- Offshore Drilling & FPSO Platforms: Confined space monitoring across process modules and lower machinery spaces.
Frequently Asked Questions
What is the expected working life of the Riken Keiki OS-B7 oxygen sensor?
Under normal ambient operating conditions the OS-B7 provides an active operating lifespan of 18 to 24 months. Operating in elevated temperatures or continuous exposure to inert gases with high acid concentrations can shorten operational life.
How should spare OS-B7 sensors be stored onboard?
Spare sensors must remain in their original nitrogen-flushed, sealed moisture-barrier packaging. Store them in a cool, dry location between 0°C and 20°C. Do not freeze. Unopened shelf life is rated up to 6 months without significant loss of service longevity.
Why won’t my gas detector span to 20.9% after installing a new OS-B7?
Galvanic sensors require 15–30 minutes to stabilize chemically after being removed from oxygen-free storage packaging. If the unit still fails calibration after stabilization, inspect the internal terminal contact springs for oxidation or verify that the instrument’s calibration gain circuit has been reset.
What is the difference between OS-B7 and OS-B3 sensors?
While both are galvanic cells manufactured by Riken Keiki, they feature distinct pinouts, body dimensions, and output voltage characteristics tailored to specific detector motherboards (such as early RX-415 versus later series instruments). Always verify the exact model designation on your detector’s internal bay label before ordering.
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