Gas Detection 11
Portable Calibration Gas Instrument Generates 0.05 To 50.0ppm Chlorine in Air NIST Certifi ed
Want to solve stability or transportation problems with special gas mixtures in disposable cylinders?
Then switch to the Advanced Calibration Designs (ACD) (USA) hand-held, battery operated Cal 2000 and generate, on site, a range of reactive gas mixtures in balance gas purifi ed ambient Air. The technique is based on ISO 6145-11 Preparation of Calibration Gas Mixtures using Dynamic Volumetric Methods - Part 11 Electrochemical Generation.
ACD CAL2000 has been sold world-wide since 1999, and is the only ATEX for EU and CSA approved for world-wide gas generation for usage in hazardous areas. It is available with interchangeable cells, standard 50 hours generating capacity and in some cases 100 hours, always with balance gas Air. Users can choose one or more generating cells from Chlorine, Chlorine
Dioxide, Hydrogen Sulphide, Hydrogen Cyanide and Hydrogen. The complete generating unit weighs less than 2 Kg, is operated by Duracell batteries, is designed to be hand-held and supplies dynamic gas mixtures on demand - no fuss, no transportation problems (as with cylinders), and unlimited shelf life. ACD and Spantech offer a back-up service which enables the CAL2000 to be re-certifi ed every year to USA NIST standard +/-10% or +/-5% accuracy on some cases on request.
Expansions to Dual Sensor Range Personal gas safety monitors can be
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found in almost every industry, with the requirement for multiple gas detection becoming commonplace. Most of these gas detectors measure both Carbon Monoxide and Hydrogen Sulphide.
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A new family of Dual Gas Sensors, from Alphasense (UK), designated 2Sense, enhance their original and highly successful miniature 2 gas sensor, the D2 with the A-Series in 20mm format. These DualSensors with a patented design have an excellent response, offer required performance and save space and cost.
Initially two sensors are available but further combinations will be added in due course; CO / H2S - the COH-A2 builds on 10 years of experience with Alphasense’s original D2 sensor; SO2 / H2S - the SOH-A2 measures the two critical sulphur gases together within one sensor body. And coming soon the NO2 / O3 - the NOO-A2 determines the two important oxidising gases for Air Quality Monitoring.
The Technical Data Sheet is available on the newly updated Alphasense website.
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www.envirotech-online.com IET September / October 2014
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