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The Owlstone Calibration Gas Generator (OVG-4) is a compact, cost-effective calibration gas system, which can generate NIST traceable, precise, repeatable, and accurate concentrations of chemicals and calibration gas standards.

Designed for calibration of industrial and scientific gas sensors, the OVG-4 incorporates permeation tube technology and can replace multiple gas cylinders. This results in significant cost and space savings as well as elimination of dangers associated with cylinders. The ability to generate arbitrarily complex gas mixtures makes the OVG-4 Calibration Gas Generator suitable for a broad range of applications from calibration of explosive detectors in military and homeland defense to testing personal monitors in industrial health and safety applications.

OVG-4 Benefits

  • Industrial and scientific vapor generation for all types of gas sensor calibration

  • Cost savings by replacing multiple, costly gas cylinders

  • Small quantities of target chemicals reduce the risk of dangerous exposure

  • Fast and easy sample replacement removes the dangers associated with high-pressure cylinders

  • Accuracy and precision even at very low concentrations with superior long-term stability and repeatability

  • Portable with compact footprint for significant laboratory space savings

  • Reduce setup time and generate blended gas mixtures rapidly

  • Adjust concentrations from parts-per-billion to parts-per-million levels

  • Interface with the Owlstone Humidity Generator (OHG) for realistic environmental testing

What's Wrong with Cylinders?

  • Not suitable for many compounds, e.g., corrosives, explosives, etc.

  • Hazards in high concentrations and high pressures

  • Cylinder and regulator costs quickly escalate with multiple analytes.

Benefits of Permeation Tubes

  • Excellent stability for up to two years of continuous use

  • Traceable to NIST standards

  • Safety–tubes contain only a very small quantity of analyte and operate at low pressure



How to Calibrate Gas Sensors with OVG-4

  • Individual permeation tubes are filled with the analyte to calibrate and test instruments, gas analyzers, and sensors (e.g., FTIR, GC).

  • The permeation tube is placed in the OVG-4, which generates a traceable gas standard for testing and calibration.

  • That's it. You are now ready to test your sensors/instruments against traceable, precise, and repeatable gas standards.

OVG-4 Technical Specifications

  • TECHNOLOGY: Permeation tubes

  • AVAILABLE ANALYTES: >500 including VOCs, environmental gases, explosive and CW agents, and simulants


  • DIMENSIONS: H 262 mm, W 142 mm, D 260 mm

  • EXHAUST CONNECTION: ⅛” Swagelok tube

  • EXHAUST FLOW RANGE: 0 ml/min to >3000 ml/min


  • INLET AIR: Regulated air/nitrogen. Free from impurities, -35°C dew point

  • INLET CONNECTION: ¼” Swagelok quick connect

  • INLET PRESSURE: 40 psi

  • OUTPUT CONCENTRATIONS: parts per trillion to parts per thousand



  • SAMPLE OUTLET CONNECTION: ⅛” Swagelok compression fittings

  • OVEN TEMPERATURE: 30–100°C ±0.1°C in 0.1°C increments

  • SAMPLE OUTLET FLOW RANGE: 20–250 ml/min



Integrating Your OVG-4 with Humidity Generators and Flow Controllers


Owlstone’s modular GenSys easily allows you to add the OHG-4 Humidity Generator and the OFC-1 Flow Controller to your system setup.



The Owlstone Humidity Generator (OHG-4) is a versatile humidity generator that is used to produce a range of relative humidity concentrations from 1 to 90%RH (±1%).


OFC-1 Flow Controller

The Owlstone Flow Controller can be fully integrated into your GEN‑SYS rack for secondary dilution and ultra-low concentrations.

OVG-4 Video 

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