Air Monitoring times the emission limit


• reference material concentration approximately 80% of 2 times the emission limit


• reference material with zero concentration


After each change in concentration, the first instrument reading shall be taken after at least three times the response time of the AMS. At each reference material concentration, at least three readings shall be made. The time period between the start of each of the three readings shall be separated by at least four times the response time.


The linearity shall be calculated and tested using the procedure given in annex B of the standard. If the AMS does not pass this test, then the problem shall be identified and solved.


Interferences


A test shall be undertaken if the process gases to be monitored contain components that are known interferences, as identified during QAL 1. This may not be required if the process concentration of the interferents are within those tested during certification.


Zero & span drift (audit)


The zero point and span drift shall be obtained from and evaluated on the basis of the records of QAL 3. Response time


The response time of the AMS shall be checked. This can be performed, if appropriate, by feeding of the reference material at the end of the sampling probe. The response time shall not exceed the measured value that has been identified during QAL 1.


Linearity


The linearity of the analyser’s response shall be checked using five different reference materials, including a zero concentration.


The reference material with zero concentration, as well as the reference materials with four different concentrations, shall be traceable.


In case of gaseous reference materials, these four 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.


The reference material concentrations shall be selected such that the measured values are at approximately 20%, 40%, 60% and 80% of the range of two times the emission limit. It is necessary to know the values of the ratios of their concentrations precisely enough so that an incorrect failure of the linearity test does not occur. The dry test reference material shall be applied to the inlet of the AMS.


The individual analysers are tested using the following concentrations applied in a randomised sequence:


• reference material with zero concentration


• reference material concentration approximately 20% of 2 times the emission limit


• reference material concentration approximately 40% of 2 times the emission limit


• reference material concentration approximately 60% of 2 Report


The results of the functional test shall be reported. Any faults shall be recorded. If the faults are judged to have an effect on the quality of data, then the operator shall carry out the necessary corrective and preventive action.


Conclusion


EN 14181 is a complex standard with far reaching consequence it relies on a high degree of co-operation by all parties involved i.e. Process Operator, Test House, AMS supplier’s service department and the regulator. We have seen that when corners are cut additional costs are incurred. By planning the project carefully, with all parties involved from the outset, good consistent results from the AMS can be achieved.


References Industrial Emission Directive 2010/75/EU


BREF Documents available from http://eippcb.jrc.ec.europa.eu/ reference/


EN 14181 - Stationary source emissions - Quality assurance of automated measuring systems


EN15267 parts 1 to 3 Air Quality – Certification of automated measuring systems


Environment Agency Technical Guidance Note M1 Environment Agency Technical Guidance Note M2 Environment Agency Technical Guidance Note M20


All Environment Agency Documents are available from www. mcerts.net


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PD CEN TR 15983 2010 Stationary source emissions - Guidance on the application of EN14181


The Source Testing Association


The Source Testing Association (STA) was established in 1995 the membership comprises representation from process operators, regulators, equipment suppliers and test laboratories. The STA is a non-profit making organisation.


The STA is committed to the advancement of the science and practice of emission monitoring and to develop and maintain a high quality of service to customers.


Its aims and objectives are to:


(i) contribute to the development of industry standards, codes, safety procedures and operating principles;


(ii) encourage the personal and professional development of practicing source testers and students;


(iii) maintain a body of current sampling knowledge;


(iv) assist in maintenance of a high level of ethical conduct;


(v) seek co-operative endeavours with other professional organisations, institutions and regulatory bodies, nationally and internationally, that are engaged in source emissions testing.


The Associations headquarters are based in Hitchin, Hertfordshire with meeting rooms, library and administration offices.


The Association offers a package of benefits to its members which include:


• Technical advice relating to emission monitoring • Conference and exhibition opportunities


• Seminars and training on a variety of related activities


• Representation on National, European and International standards organisations


• Training in relation to many aspects of emission monitoring


• Liaison with regulators, UK and International, many of whom are members.


Weather Stations for Building Controls and Solar Energy


Gill Instruments (UK) has expanded the MetPak multi-sensor weather station range with the introduction of a new Modbus connectivity. The new output feature has been introduced to provide industrial markets with the robust, long-term reliability and high accuracy measurement data provided by MetPak units.


The complete MetPak range is now available with an industry recognised Modbus communication protocol as standard, alongside the existing ASCII, NMEA 0183 and SDI-12 outputs. The new output allows industrial and building control users to connect MetPak base station units into a network of multiple devices as part of an integrated computer or SCADA system.


Used throughout industry, the MODBUS output communicates with multiple measurement devices to provide greater data collection via one supervisory computer.


Already well-established in marine, industrial and meteorological applications, MetPak units provide accurate data to oil platform, railway, emergency response vehicle and solar energy customers. The MetPak family are solid-state, lightweight weather stations and are operational in some of the world’s most extreme operating conditions and inhospitable locations.


With on-board processing electronics, the multi-sensor base stations have the ability to supply building control and automation markets with over 6 weather monitoring parameters. These include wind speed and direction, barometric pressure, air temperature, humidity, dew point and precipitation. In addition MetPak is capable of supporting a number of independent sensors, combining there outputs to produce an integrated data message.


At just 2.1kg, MetPak weather stations are extremely portable delivering easy installation and maintenance in difficult to reach areas. The successful weather station range can now offer its exceptional quality data and unparalleled reliability to a wide range of building and energy industries as part of an integrated communication system.


“The expansion of the MetPak range is very exciting for us” says Richard McKay, Meteorologist and Product Manager at Gill Instruments “The MODBUS upgrade will take the MetPak firmly into the industrial market, giving us the ability to supply a high quality measurement system to our industrial MODBUS customers at no extra cost.”


For More Info, email: email:


For More Info, email: 28858pr@reply-direct.com www.envirotech-online.com IET March / April 2014


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