Instrumentation
A typical application for the transportable Condumax II would be investigations into the performance of hydrocarbon reduction processing by natural gas producers. The analyser can be brought into operation quickly at any point in the process to help resolve issues.
turbines need to be sure of the superheat margin between the dew point and delivery temperature of the fuel gas to avoid damage caused by liquid condensate in the gas, as well as avoiding environmental levies on emissions. The transportable Condumax II enables checks of the hydrocarbon and water dew point of the natural gas entering the fuel gas system. Condumax II is certified for use in hazardous areas
around the world. Other portable Michell products are the dew-
point hygrometers Easidew Portable, MDM300 and MDM300 I.S. These allow quick and easy spot- checks to be made of water dew point in a number of processes from compressed air systems to natural gas (with the intrinsically safe version). Quantitech has launched Voxtrac in-pipe gas
flow monitoring technology that also offers the ability to measure gas composition or purity. Sales director Dominic Duggan says: “This is an important announcement because, unlike other methods, this measurement is not affected by the gas composition, temperature, density, viscosity or pressure, and there is no obstruction at the measurement point.” When the speed of sound (SoS) in a gas is measured
along a path in both directions simultaneously, the difference in the measured velocities is proportional to the gas velocity along the pipe. If gas temperature is expected to fluctuate, an automatic compensation is applied. If the gas is at a pressure below ambient then it
Fig. 2. The transportable Condumax II enables checks of the hydrocarbon and water dew point of the natural gas entering the fuel gas system..
Gas pipeline transmission operators usually have on-line hydrocarbon dew-point analysers installed at the entry and delivery points of their pipeline network, however, the transportable Condumax II allows for checks of quality to be made at any point within the pipeline. Electricity generating companies that operate gas
is only the volume of the sound that would limit the measurement capability. Measurements at 100mbar are feasible and flow rates between 0.01l/min and 200l/min are possible in pipes up to 200mm in diameter. Running from a 24vDC supply, the meters respond rapidly and output data in variety of formats. For the qualitative monitoring of single gases, any
change in the SoS measurement will indicate that the purity of the gas has changed.
Gas analyser passes long-term test M
etrohm’s 875 KF gas analyser is a software-controlled system for determining the water content in
gases and liquefied gases. The company has just published the results of a long-term test proving the stability of the new system‘s hard- and software, its robustness, and the good repeatability of the results produced. The results, in Application Bulletin 357, can be downloaded free of charge from
www.metrohm.com. The 875 KF gas analyser module consists of a pipe system including four software-controlled
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magnetic valves, which allow the control of the sample gas and the rinsing gas flow. Additionally, an oven, a mass flow controller, the titration vessel with indicator and generator electrode (with diaphragm), and a coulometer are included in the module. The long-term test took 78 hours, during which 360 water determinations were carried out. Metrohm has also published a range of free monographs designed to present practical know- how of chemical analysis in a nut shell. They are written by professionals with years of practical experience, they have been used in teaching for
a long time, and they are free: the company says its monographs are a great tool for anyone who wants to learn the basics of important analytical methods such as titration, ion chromatography, voltammetry, conductometry, near-infrared spectroscopy, and more. A key feature of the monographs is that they keep the theory part to a minimum, putting the main focus on practical use of the respective methods. A comprehensive list of the 15 titles currently available can be downloaded by clicking ‘application literature’ at
www.metrohm.com ■
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