Author Archives: Dietrich von Diemar

  1. Happy Thanksgiving

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    In observance of the U.S. Thanksgiving holiday, Oxigraf Offices will be closed on Thursday and Friday, November 25-26, 2021. Normal business hours will resume on Monday, November 29. We wish you all a safe and happy holiday!

  2. Oxigraf O2N2 Oxygen Analyzer for On-Board Inert Gas Generation System (OBIGGS) validation

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    An On-Board Inert Gas Generation (OBIGG) system is now mandatory for many civilian and military aircraft to prevent the buildup of explosive conditions in fuel tanks by generating Nitrogen Enriched Air (NEA) to lower the oxygen content in the fuel tank headspace or ullage. Oxigraf provides a complete system for validating the performance of your OBIGG system.

    The Oxigraf O2N2 oxygen analyzer characterizes the performance of an OBIGG system over an entire flight profile from takeoff, climb, cruise, and descent by measuring the oxygen concentration at multiple sites in the fuel tanks every 16 seconds.

    The O2N2 analyzer is a specialized instrument evolved from Oxigraf oxygen analyzers commonly used for medical, scientific, and industrial process and safety applications. The patented laser diode absorption spectroscopy technology employed by Oxigraf is a natural fit for analyzing oxygen concentrations in a Jet-A fuel-air mixture as only light comes in contact with the gas sample, and the gas sample is maintained at a low temperature. The sensor responds in milliseconds, has no cross sensitivity to other gases, corrects automatically for changes in temperature and pressure, measures quickly over a wide dynamic range, and is insensitive to vibration.

    The aircraft OBIGG validation system is comprised of several rack mount Oxigraf O2N2 oxygen analyzers mounted in a rugged rack system along with manual cut-off valves, regulators, purge and calibration gas supplies, and a laptop computer with the OxiFTE system control and data logging software. Fuel tank sample kits with float valves and tubing to sample locations complete an installation.

    Additionally, the system has features to mitigate risks of escape of the sample gas, such as monitored nitrogen purging of the electronics enclosure. The OBIGG test system also features float valves at the fuel sample point to prevent ingestion of fuel at the sample location. Manual shut-off valves and test ports a low total system validation and operator intervention if necessary to remove the analyzers from contact with the fuel system.

    The number of O2N2 analyzers in a system depends on the number of sample points required in the fuel tank system to be monitored, with each O2N2 analyzer having four (4) sample channels. The example system shown below is comprised of twelve (12) channels mounted in an 18U chassis with the other parts of the system. Oxigraf can provide standard 12U and 18U chassis along with custom racks as required for the application.

    Please download your Oxigraf O2N2 OBIGGS Validation Brochure (pdf).

  3. Labor Day

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    Oxigraf Offices Are Closed September 6, 2021 In Observance of Labor Day.

  4. Oxygen/CO2 Analyzer for Capnography

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    Model O2Cap Oxygen/CO2 Analyzer for Capnography:

    Monitoring of the concentration or partial pressure of oxygen and carbon dioxide (CO2) in respiratory gases requires fast response without overshoot. The Oxigraf Oxygen/CO2 Analyzers respond in less than a second. Electrochemical sensors may incorporate long averaging times, 20 or more seconds, for large, abrupt changes in oxygen concentration. Laser diode technology offers short response times to meet your capnographic requirements. The O2Cap family integrates an Oxigraf oxygen sensor with a NDIR CO2 sensor for dual gas measurements for research, medical and laboratory measurements.



    The Oxigraf O2Cap may be the O2/CO2 Analyzer you need:

    • Long life sensor, laser diode based sensor has a 10-year lifetime, does not require periodic replacement.
    • Fast response time, unit will respond to abrupt changes in O2 level in seconds.
    • NO errors due to vibration and movement
    • NO errors due to temperature changes
    • NO errors due to changes in barometric pressure
    • Accurately displays O2 levels for measuring 5-100% oxygen concentrations and 0 to 10% CO2

    Oxigraf works with clients across a wide range of industries to address their unique analyzing needs. Recently, for instance, we helped a client who was looking for a way to perform capnography tests with fast breath by breath measurement. The detailed case study is outlined below.

    The Problem:

    This client was looking for a way to measure and display the oxygen and CO2 concentrations in a gas sample drawn through the instrument. The company turned to Oxigraf for a reliable capnography solution.

    The Solution:

    The Oxigraf O2Cap is an analyzer that integrates a gas sampling system with sensors to measure and display the concentrations of oxygen and carbon dioxide in a sample as the percentage of a gas in the sample by volume. This method of expressing the concentration of a gas in a sample is also known as the percent volume fraction. In addition to the sampling and sensing systems in the O2Cap, the unit has a fluorescent display used for programming the unit and observing measurements, a keypad for programming the unit’s operation and calibration, and analog outputs that allow the unit to be connected to data recording units like the OxiSoft.

    When measuring the concentrations of oxygen and carbon dioxide in a gas, a sample is pumped from the input port on the front panel of the O2Cap, through the sample cell, and out an exhaust port on the back panel of the unit. Gas samples are drawn into the unit through an external filter on the input port that protects the sensors from contamination and through Nafion tubing on the filter that removes moisture from the samples that would affect the measurements and the unit’s calibration. The oxygen concentration of the gas in the sample cell is measured using laser diode absorption technology. The laser diode in the oxygen sensor produces light at a wavelength (760 nanometers) that is absorbed by oxygen. The light passes through the gas pumped into the sample cell and onto the surface of a detector.

    The output of the sensor is inversely proportional to the concentration of oxygen in the sample because the amount of light reaching the detector decreases as the concentration of oxygen in the sample increases. The O2Cap has a very fast response time that enables breath to breath analysis of gas concentrations because the unit analyzes the gas sample every 10 milliseconds, or 100 times per second. During each measurement interval, the analyzer is zeroed automatically by electronic tuning of the laser to a wavelength not absorbed by oxygen.

    The Oxigraf laser diode oxygen analyzer has a very long life span — especially compared to other options on the market — and requires no periodic replacement or servicing.

    The Oxigraf Model O2Cap (AL) oxygen analyzer is a diverting oxygen monitor.  Gas may be flowed under pressure with the sample pump off or on. The major components, pneumatic circuit, and flow path are shown in the block diagram above.

    The Result:

    The client’s problem was easily resolved with the use of our O2Cap analyzer model, which allowed for an accuracy of +/-0.2%. This client was very pleased with the system we provided and has since spread the word about our product line and capabilities to other customers in the medical industry.

    The O2Cap gas analyzer is calibrated at the factory and is ready to take measurements. Just connect the source of the gas sample to the gas analyzer with the proper connections and press the RUN key.

    The model O2Cap and O2CapB have luer type front panel gas sample input fitting for research applications. The model O2CapD have CPC O-Ring quick connect gas sample fittings for industrial applications.
    All of the Model O2Cap, O2CapB and O2CapD include a sampling pump that will draw a sample from atmospheric pressure; with an external flow control valve, it will accommodate pressurized gas up to 1.3 psig (17 psia or 120 kPa).
    An optional gas sampling valve allows the pump to draw a sample for a programmable number of seconds. This feature is useful for sampling from Modified Air Packaging (MAP).

    Oxigraf O2Cap Oxygen/CO2 Features:

    • Internal Sampling Pump.
    • Relay contacts can be used to control external equipment.
    • Relay contacts are Form C (SPDT), 5 A 250 VAC rating.
    • Analog 4 to 20 mA, analog 0 to 1 VDC, and digital RS-232 outputs. Visual, audible, and remote alarms for Low O2, High O2, Low Flow and System Check.
    • Samples and displays oxygen from 5 to 100% without range switching.
    • Calibrates electronically using 10%O2/5% CO2 and 100% O2 cal gases.
    • Electronic flow meter and display included.
    • Front panel CPC-Quick connect fitting.
    • Fast Response (< 1 sec) for prompt analysis.
    • Pressure and temperature correction automatical
    • No false oxygen readings with Ar, H2O, CO2, CO, or hydrocarbons.
    • Rugged laser diode absorption spectroscopy oxygen analysis.
    • Measures at low flows of 50 to 250 ml/min, conserving product gas.

    Learn More:

    Oxigraf has over 20 years of experience producing laser gas sensors and instruments and is the leading manufacturer of laser absorption spectroscopy sensors for oxygen gas measurement and analysis. Oxigraf O2iM Oxygen Safety Monitors have been widely adapted in hundreds of facilities since 2004, replacing a wide range of less reliable electrochemical sensors. Oxigraf O2 and CO2 sensors have been widely adapted by OEM manufacturers of medical respiratory gas monitors in order to measure breath waveforms, end-tidal gas values, anaerobic thresholds, VO2 max, and non-invasive cardiac outputs. For more information on our sensors, or to speak with an expert about your specific monitoring needs, contact the team today.

    Please download your Oxigraf Case Study: Oxygen/CO2 Analyzer for Capnography (pdf)

  5. Flag Day

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    Committed to our People. Committed to our Country.

    Happy Flag Day!

  6. Dräger makes Medical History with Breathing Apparatus

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    Dräger makes medical history with breathing apparatus

    Das Drägerwerk steht für 130 Jahre Firmen- und Familiengeschichte. Es stellt so begehrteste Produkte wie Beatmungsgeräte her.
    (The Drägerwerk stands for 130 years of company and family history. It manufactures such popular products as ventilators.)

    Die Corona-Pandemie rückt das Lübecker Familienunternehmen Dräger in den Fokus. Ihr begehrtes Produkt: Beatmungsgeräte.
    (The Lübeck-based family company Dräger is focusing on the corona pandemic. Their coveted product: ventilators.)

    Source: NDR German TV Documentary from: Apr 21, 2021

  7. Linde in India committed to augmenting medical oxygen supply in India

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    Linde India Limited and Praxair India Pvt. Ltd. are subsidiaries of Linde Plc. Linde plc. was created in October 2018 by merger of Praxair Inc. and Linde AG

    Linde in India committed to augmenting medical oxygen supply in India

    As India’s second wave of Covid-19 pandemic continues to escalate rapidly, existing supply chains are under enormous pressure in meeting the huge demand, especially to the most impacted parts of the nation. To address this critical need of the hour, Linde India and Praxair India are working on several large-scale initiatives in cooperation with the Government of India, relevant authorities, and industry partners at a national level.

    To help ease bottlenecks in distribution, Linde in India has embarked on two major operations. The company is working closely with the Indian Railways for its Roll-On-Roll-Off (RO-RO) service for faster transportation of medical oxygen to most critical need areas. Empty tankers are being ferried closer to its plant locations, where they are filled-up with much needed oxygen and the supply is then transported via roadways to various parts of India.

    Secondly, Linde is collaborating with its operations in the Asia Pacific, including in Singapore, China and Thailand, as well as various Indian industry partners to transport ISO cryogenic tankers from across the region to India. These containers can carry up to 20 tons of Liquid Oxygen over long distances, and upon arrival the containers will be conditioned and certified for liquid medical oxygen transport from Linde facilities. The tankers can also act as interim oxygen storages in remote areas that are facing oxygen scarcity.

    As of today, 8 containers have arrived in India and many more are expected to over the next few weeks.

    In addition, the company has taken steps to convert industrial volumes to medical oxygen ready to cater to the increasing need. Linde India and Praxair India Pvt. Ltd. collectively manage and operate several plants with Air Separation and manufacturing capabilities. These plants currently have a combined capacity of more than 2000 metric tons per day (MTPD) and are located across India.  Both the companies are also converting their Liquid Nitrogen and Liquid Argon tankers to augment the oxygen transportation capacities.

    Linde India and Praxair India Pvt. Ltd. have also fast-tracked installation works at partner hospitals to ease oxygen supply challenges there. Among others, they have recently installed a 20 KL tank at GMERS Medical College, Junagadh, and Gujarat. GMERS Medical College, Junagadh and another 20 KL tank at Sanjay Gandhi Post Graduate Institute, Lucknow.

    These are just some of the initiatives that Linde India and Praxair India Pvt. Ltd. are currently working on, and the company is currently having discussions with additional multiple stakeholders and industry partners so that more containers and necessary equipment can be brought into the country.

    Moloy Banerjee, Head Gases – South Asia, Linde South Asia Services Private Limited said, “As part of Empowered Group 2 (EG2), we are closely working with Government of India to produce and supply medical oxygen to various parts of the country. All possible efforts are being undertaken to address supply and transportation challenges and we are thankful to our international counterparts and industry partners such as the ITC Group, Tata Group and many more such organizations that are coming forward to lend their support in executing these initiatives. We are committed to support the government in this fight against the debilitating pandemic and will continue to explore other avenues to help address the challenges emerging during these trying times.”

    Read the Original Story in the Goa Chronicle from April 28, 2021:


    Thanks to our friends at Linde for their support #PrayForIndia

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