New generation flue gas analyser

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July 2005 Analytical Instrumentation & Environmental Monitoring

New to flue gas measurement technology is a multipurpose analyser that is user-friendly due to its ergonomic design and uncomplicated menu driven operation. It has an automatically controlled diaphragm pump; dilution factor and condensation trap and can monitor its own functionality, resulting in a longer lifespan and more accurate readings. Measurement cells can be easily changed without losing essential data.

Current flue gas analysers are often too bulky, have complicated installation and operation procedures and only cater for certain applications. Users cannot determine when a function on the instrument is not working properly, which could lead to faulty readings. The measurement cells are generally susceptible to failure as they have no protection against condensation and high CO levels and, depending on the pressure at the measuring point, the cells may not receive a consistent sample of flue gas, resulting in an inaccurate analysis.

Testo, a European leader in portable measuring equipment, has recently introduced a unique flue gas analyser that is user-friendly due to its ergonomic design, uncomplicated menu driven operation, backlit display, new lithium ion rechargeable batteries and easy structuring of data via the memory management system inside the analyser. Additionally, individual measurement protocols can be generated using the 'easyEmission' software, which can be connected via the USB interface or built-in IRDA interface.

The versatile Testo 335 can be used in many applications including industrial combustion systems, boilers and burners, plant construction and stationary engines. This instrument is tailored to each user's specific requirements as the measurement cells can be quickly and easily changed to suit the different measurement jobs. No information will be lost during the change over, as all data is stored in the cell itself. Measurement cells are automatically recognised by the instrument and the calibration phase can be completed within 30 seconds.

The analyser has a built-in dilution factor which dilutes the concentration of gases to protect the measuring cells, thus, minimising the chances of failure that is caused by high CO levels during the start up phase of combustion systems or when monitoring emissions in stationary engines.

A built-in gas pump draws samples of the flue gas for further analysis. This pump is automatically controlled to compensate for both negative (up to -200 mbar) and positive pressure (up to +50 mbar) at the measuring point ie, the pump flow is held constantly in this range, resulting in the correct amount of flue gas being analysed every time.

The Testo 335 also has an internal condensation trap that eliminates the possibility of condensation developing in the measuring cell. This, together with the special layout of the gas paths in the analyser, prevents blockage and considerably prolongs the instrument's service life.

The instrument can provide up-to-date information on the status of its functions, enabling the user to know when a fault has occurred, thus, resulting in a more accurate analysis. Included in the instrument's diagnosis is a quality check on measuring cells, filter status, condensation trap level indicator, leaks in the analyser, pump capacity, charging status of rechargeable battery, date of last maintenance and sensor calibration data.

The Testo 335 can be used for monitoring efficiencies, O₂, CO, CO₂, SO₂, NO and NO₂ concentrations as well as ambient CO and CO₂ levels and flue gas temperatures, draughts, differential and absolute pressure. It is exclusively distributed in sub-Saharan Africa by UniTemp.

For more information contact Marcel Kelly, UniTemp, 011 392 5989, [email protected], www.unitemp.com

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Analytical Instrumentation & Environmental Monitoring

New generation flue gas analyser

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