Air Monitoring - UK Focus v
Gas Dilution for Linearity Tests The principle of a linearity test is to check that the gas analyser system is ‘linear’.
The linearity shall be calculated and tested using the procedure given in annex B of the standard EN14181. Linearity tests can be performed by Service Engineer, Site Engineer or Stack Testing House, although must be deemed competent to perform the checks.
The reference material concentrations shall be selected such that the measured values are at approximately 20%, 40%, 60%, 80% and 100% of the range of two times the emission limit.
To perform a linearity test for each gas and at five different percentages it would be very expensive to have separate gas bottles for each test. It would also be very time consuming to manoeuvre a large quantity of bottles.
A gas divider makes the job much easier. These five reference materials can be obtained from different gas cylinders or can be prepared by means of a calibrated dilution system from one single gas concentration. So in essence, the engineer will only need to carry as many bottles that represent each of the gases.
The gas divider from Environics offers: a broad range of dilution ratios (up to 1,000:1) which allows the user to significantly reduce the number of cylinders needed to perform linearity tests; allows multi-point calibration of analysers; automatic calculation of dilution and span gas flows; internally-stored mass flow controller calibration tables; modular design allows for additional gas circuits to be added; user definable cylinder library allows for easy selection of frequently used gas cylinders; plus each cylinder may contain an unlimited number of component gases with automatic K-factor calculation.
For more information contact appointed distributors a1-cbiss Ltd. (UK).
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60mph Motorway Speed Limit Plan on Hold
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A proposal to introduce 60mph speed limits on some of the UK’s busiest motorways in a bid to cut air pollution has been put on hold.
Transport secretary Patrick McLoughlin has given the Highways Agency 18 months to come up with other methods that will reduce the high level of pollutants on a 32-mile stretch of the M1 in Derbyshire and South Yorkshire and 2.8 miles of the M3 in Surrey.
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Mr McLoughlin ruled out the idea of a blanket cut in the speed limit but, if an appropriate alternative is not found, the 60mph limit could still be imposed at peak time.
The Highways Agency has been asked to look at other ways of cutting pollution and monitoring air quality. This could include constructing high barriers to funnel fumes away from ground level or limiting heavily-polluting vehicles at certain times.
Two sections of the M1 and part of the M3 have already begun the transformation to become a “smart motorway”, which allows the hard shoulder to be used either permanently or during busy periods. The speed limit can then be varied or lanes closed in emergencies by using the overhead signs.
Construction has already begun between junctions 28 and 31 of the M1 in Derbyshire and junctions 32 and 35a in South Yorkshire, and on the M3, between junctions 2 and 4a. This should increase capacity by a third and improve journey times by up to ten per cent on the M1 schemes and 15 per cent on the M3, where average speeds are currently 45mph during rush-hour, reports the BBC.
However, the Highways Agency is concerned that this extra traffic could break EU air quality rules, and harm the health of people living and working near the motorways, which led the agency to propose that 60mph limits be enforced between 7am and 7pm every day to cut pollution.
Mr McLoughlin rejected this approach, saying: “Let me be absolutely clear, I want all motorways to run at 70mph. While it sometimes makes sense to use variable limits to keep people moving, blanket reductions are not acceptable.”
New Environmental Monitoring System for Indoor Air Quality
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SST Sensing Ltd (UK) are pleased to announce the launch of a new Environmental Monitoring System called the AQ-Alert+. It is the solution to monitor and control air quality in any building. The affordable AQ-Alert+ System was designed on the basis of customer demand for a product that could not be found anywhere else on the market place. The AQ-Alert+ measures the concentration of carbon dioxide in the air with options to also measure oxygen concentration, temperature, atmospheric pressure and relative humidity at a very competitive cost.
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As well as offering standard versions of the AQ-Alert+, which suit most customers’ application requirements, the AQ-Alert+ is completely configurable, meaning that you can customise the system to exactly meet your specific application needs. Any combination of output is available and the traffic light LED indicators can be set to illuminate at your chosen CO2
stability in any ambient environment.
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28337pr@reply-direct.com levels. The compact and maintenance free design assures long term
Hot or cold gases 1 - 100,000 ppm Proven reliability
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3006 portable VOC analyser with MCERTS
Multiparameter
Hot, humid and even corrosive gases
Future-proof technology Fast warm-up Available for hire
Emissions Analysers with MCERTS
Gasmet DX4000 the only transportable FTIR cems with MCERTS!
Are you interested in what you have read and want to know more?
www.envirotech-online.com IET Annual Buyers’ Guide 2014/15
Supplying and servicing environmental instrumentation for over 30 years
01908 227722
sales@quantitech.co.uk
www.quantitech.co.uk
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