January 2005Analytical Instrumentation & Environmental Monitoring
The EXA-based GD402 Hydrogen Purity Analyser enables high performance measurement without reliance on thermal conductivity properties.
Hydrogen cooling
The EXA GD402 monitors the concentration of H2 in air; typically in the range is 85-100%. A low H2 alarm alerts the operator when corrective action is required.
Purging
GD402 also serves as a purge gas monitor. When the generator is down for maintenance, the analyser can be switched from 'H2 Purity' mode to 'H2 in CO2' (0-100%). As the H2 is displaced by the CO2, the analyser accurately tracks the concentration on the display and its second 4 to 20 mA output. Once the H2 has been displaced, the GD402 is switched to measure 'Air in CO2' (0-100%), completing the purge cycle. The second 4-20 mA output is automatically switched to track the air in CO2. This purge cycle is reversed as the generator is prepared to go back online.
Principle
EXA GD402 is a density-measuring device employing the principle that the resonant frequency of a thin-walled cylinder will vary according to the density of the gas surrounding it. Concentration values are computed directly from the density data measured. The key to GD402's accuracy, long-term stability and maintenance-free operation is its multimode oscillation system, whereby the cylinder resonator is forced to resonate simultaneously at two different frequencies. The resultant ratio measured eliminates errors caused by moisture or dust build-up, thus significantly increasing the instruments accuracy and reliability.
The unique, rugged sensor offers significant advantages over other sensing technologies:
* One sensor for 'H2 in Air', 'H2 in CO2' and 'CO2 in Air'.
* High accuracy ±0,1% linearity.
* Linear response of sensor means simple calibration.
* Low pressure drop.
* No warm-up time.
* Fast response time to 90% within 5 seconds.
* Fast calibration time.
* High resistance to moisture and dust sensor can be cleaned if 'slugged' with oil/moisture.
* Does not require reference gas for operation.
* Immune to external vibrations - (shock-mounted sensor).
* Thermal stability - unaffected by ambient temperature fluctuations.
* Familiar EXA interface with simple 'Yes/No' setup.
* Two outputs for two different ranges.
* Low cost of ownership.
Calibration
The entire calibration process is simplified with the EXA GD402 analyser. Only two calibration gases are required and these are already on users' sites. The GD402 is zeroed using 100% hydrogen, and is spanned using 100% CO2. There is no need to maintain dangerous mixtures of H2 in air. Calibration is performed using the simple Yes/No prompts for which the Yokogawa EXA Analysers are well known. There is no need to calculate responses or response curves. The EXA GD402 does it for the user. Typical calibration time is less than 30 minutes.
Maintaining hydrogen purity at the correct level is critical for proper, safe operation. Yokogawa has designed the EXA GD402 to be reliable under a wide range of harsh process conditions. The overall result is a system designed with users applications in mind.
High-precision measurement of insulating gases
Analytical Instrumentation & Environmental Monitoring
WIKA has launched the next generation of its GA11 gas analyser. It enables switchgear operators, manufacturers and maintenance companies to record the quality of SF6 gas and alternative insulating gases.
Read more...Say goodbye to missed contamination with real-time colour monitoring
Analytical Instrumentation & Environmental Monitoring
Applied Analytics offers seamless and rapid colour monitoring in processes with an industry-proven analyser that quickly and accurately monitors colour in your sample stream for impurities and inconsistencies.
Read more...Metrology laboratory is the heart of data-driven production consistency
Analytical Instrumentation & Environmental Monitoring
Pressing and welding have been at the core of Tier 1 automotive supplier, Malben Engineering for 50 years; but it is the company’s investment in its state-of-the-art metrology laboratory which has set it apart.
Read more...Unlocking precision: The future of inline concentration measurement
Analytical Instrumentation & Environmental Monitoring
[Sponsored] In today’s resource-conscious industrial world, manufacturers are under growing pressure to optimise productivity, ensure consistent product quality and minimise waste. One of the most effective levers for achieving these goals lies in mastering concentration measurement, and Anton Paar is redefining how it is done.
Read more...High-precision measurement of insulating gases WIKA Instruments
Analytical Instrumentation & Environmental Monitoring
WIKA has launched the next generation of its GA11 gas analyser. It enables switchgear operators, manufacturers and maintenance companies to record the quality of SF6 gas and alternative insulating gases.
Read more...Smart sensors for cleaner, safer food and beverage processes Instek Control
Analytical Instrumentation & Environmental Monitoring
Instek Control specialises in advanced measurement solutions tailored for the food, beverage, pharmaceutical and mining industries. Among the company’s offerings are advanced process sensors from Anderson-Negele, as well as ALVIM biofilm monitoring technology.
Read more...Elevating mining separation processes through precision instrumentation Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
In mining operations, the quest for efficiency and productivity is key. There is an urgent need for innovative solutions to enhance the performance of extraction processes while balancing operational costs and environmental impact.
Read more...Alfa Laval launches next generation
Analytical Instrumentation & Environmental Monitoring
Alfa Laval has launched Clariot, a next generation, AI-based condition monitoring solution, precision-built for hygienic process equipment to deliver more accurate analysis and support.
Read more...The next generation in metal sorting Mecosa
Analytical Instrumentation & Environmental Monitoring
In the metal recycling industry, companies are increasingly challenged to not only improve the efficiency of their processes but also to raise the quality and purity of the sorted materials to new levels. By integrating proven spectral analysis technology into its market-leading REDWAVE XRF sorting system, REDWAVE is unlocking new opportunities for metal recycling, particularly in aluminium recovery.
Read more...Ensuring clean and safe water Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
Endress+Hauser’s comprehensive range of disinfection sensors are designed to monitor and control disinfectant levels in water treatment processes.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version