42 Environmental Analysis Calibration Standards for Trace Moisture Monitors


KIN-TEK’s (USA) Span Pac™ H2O – SD (second dilution) uses a Trace Source™ Permeation Tube to add a precisely known, adjustable, trace concentration of water vapour into a flow of dry matrix gas to create calibration standards for trace moisture monitors. A second dilution stage then takes an adjustable aliquot of that primary mixture and further dilutes it with matrix gas to create substantially lower concentrations. This two-stage dilution method allows the output concentration of trace moisture to be varied seamlessly over a range of up to 10,000:1 from a single permeation tube. The system is designed to add water vapour concentrations in the range from 100ppb to over 5,000ppm.


An alternate function of the two-stage dilution system is to generate a variable moisture concentration while maintaining constant total flow. In this mode the concentration can still be varied over a range of up to 400:1.


The Standard Additions Technique is used to compensate for residual moisture in the matrix gas. In use, accuracy of the measuring device is achieved by calibration on the differential response due to the moisture addition. The moisture concentration added by the Span Pac™ H2O - SD is traceable to NIST through physical standards.


Reader Reply Card No. 183


World Filtration Congress


Whitehouse Scientific (UK) is a provider of high quality particle sizing standards and calibration microspheres, and will exhibit its range of filter calibration products and services at the 11th World Filtration Congress in Graz, Austria from 16-20 April 2012.


This will include details of Whitehouse Scientific’s method for determining the cut point of filter media. Using specially prepared, precision glass microspheres to challenge the filter, it is possible to measure filter efficiencies within micron resolutions. The Whitehouse Scientific method uses narrow particle size distribution standards and covers pore sizes from just a few microns to more than 600 microns. Results are highly reproducible and traceable to international standards, NIST for example.


According to Jamie Storey, Managing Director of Whitehouse Scientific, “As the name suggests, challenge testing involves challenging the surface of a filter with actual particles. Particle sizes are then measured upstream and downstream of the filter. The maximum size passing through reflects the largest pore size. Challenge testing is one of the most robust methods of filter testing because we use spherical particles analysed by microscopy, where any out of shape particles can be eliminated.”


Reader Reply Card No. 184


Solar 1000 – Solar Monitoring Stations


The SOLAR1000 data acquisition system is specifically designed for solar monitoring application and is fully programmable and easily customisable with options for communications, mounting, sensors etc.


Typical applications include solar resource assessment, baseline data collection, and performance monitoring. The SOLAR1000 acts as the single point data gateway for environmental, inverter, and meter data.


Measurements include: air temperature, solar radiation—global horizontal (GH) and plane of array (POA), surface temperature( back of panel), wind speed and direction, precipitation, barometric pressure.


Solar1000 Benefits and Features: • Thermopile-style irradiance measurements and thermocouple back of panel temperature measurements • Pre-wired design reduces installation time • Supports Dynamic Host Configuration Protocol (DHCP) and static IP configuration • Solar/battery power provides data collection redundancy during power outages. • Acts as single point data gateway for environmental, inverter, and meter data. • Modbus, CanBus, and DNP 3.0 compliant.


Reader Reply Card No. 187


Flashing LED Alert Big-Digit Alarm Timer


Control Company’s (USA) Traceable® Flashing LED Alert Big-Digit Alarm Timer with unbeatable 0.01% accuracy, has extra-large 1-inch high digits, flashing LED, and adjustable alarms. A unique microcomputer chip allows memory to store countdown times, easy for users to program and save their three most frequently used settings. The multi-purpose timer counts down from 99 minutes, 59 seconds to 1 second; when zero is reached, the timer starts counting up to show time elapsed since alarm sounded.


The adjustable alarm has three settings: high volume for noisy areas, low for quiet environments, and muted for visual flashing only. This can be seen-from-anywhere, vivid green indicator flashes every second after countdown time reaches ten seconds. A red light flashes when zero is reached and alarm is sounding.


To assure accuracy, an individually serial-numbered Traceable® Certificate is provided from Control Company’s ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology).


The timer is supplied with; magnetic back, flip-open stand, spring clip, opening for lanyard, AAA batteries and Traceable® Certificate.


Reader Reply Card No. 188 Reader Reply Card No. IET March / April 2012 www.envirotech-online.com 186


New Inlet Dissolved Gas and Vapour Monitor


The Hiden Analytical (UK) HPR-40 Membrane Inlet Mass Spectrometer series now feature an extended range of submersible insertion probes and flow-through semi-permeable membrane interfaces, specifically engineered for measurement of dissolved gases and vapours in aqueous solution in diverse environments and applications.


The systems provide real-time analysis of biological and physical processes within aquatic and marine processes, with interfaces refined for specific applications including bio-fuel development, soil analysis, water quality determination, fermentation culture monitoring


and photo-responsive Single membrane flow-through interface processes.


The compact mass spectrometer module is bench-top and cart-mounting compatible, with comprehensive control and data analysis programs for both automated and manual operation. Multiple sampling lines can be accommodated for automated sequential multi- media sampling, the QIC BioStream variant currently operating with up to 80 sample streams. A custom-design service is available to assist with interface design for specific R&D projects.


Reader Reply Card No. 185


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