Measurement and Testing via USB, Ethernet and RS 232 interfaces.


The linear range of the ERACHECK extends from 0.5 to 1000 ppm. A characteristic calibration curve est- ablished with hexadecane dissolved in cyclohexane is shown in Figure 1.


One Calibration fits all


The capability of the ERACHECK to analyse samples from different sites in Austria and the North Sea, including crude oil and condensate samples, using one calibration, was assessed. For this purpose a constant amount (500 ppm) of these samples was dissolved in cyclohexane and measured with the ERACHECK. The results obtained were uniform as depicted in Figure 2. It is of special interest to see that no significant difference in the response of the ERACHECK between crude oil and condensate samples was observed. Therefore it may be concluded that using the ERACHECK it would be possible to analyse all studied samples using the same calibration. The BAM (“Bundesanstalt für Materialforschung und -prüfung”) reference standard can be used as a reproducible hydrocarbon composition.


Conclusion Figure 2: Response of the ERACHECK to 22 different 500ppm samples including crude oil and condensate in cycloheaxane


cyclohexane or cyclopentane. Different calibrations can be stored on the instrument and selected whenever necessary. Prior to sample measurement a background measurement needs to be performed which is stored on the instrument. Measurement of


background and sample is accomplished within two minutes. Push button simplicity using the touch screen display also allows non-specialist personal to perform reliable measurements. Experimental data and results are stored on the instrument’s PC and can be accessed


Based on mid-IR quantum cascade laser technology the ERACHECK is capable to perform fast and reliable measurement of hydrocarbons in water from 0.5 to 1000 ppm. The ERACHECK method is CFC free and guarantees high precision and sensitivity. Due to its portability the ERACHECK provides reliable results on-site which save time and transportation costs.


39


Novel Half-Inch Needle Valve Boosts Reliability In Viscous And Contaminated Media Applications


A novel new half-inch (12.7 mm) bore instrumentation needle valve gives plant engineers the means to improve reliability, and save both money and space, in process and instrumentation applications involving viscous and contaminated media. Today, such applications are often implemented using much larger and more expensive piping valves.


Believed to be the first of its type on the market, the half-inch needle valve has been developed by the instrumentation products division of Parker Hannifin (UK). Parker's new H-series needle valve is available in two forms: as either a discrete hand valve for controlling media flow, or integrated into a monoflange-style manifold for the safe 'double-block-and-bleed' connection of instruments to process lines.


The large flow path of the half-inch H-series needle valve makes it much less prone to blockages or related problems when dealing with viscous and contaminated media. Such issues can lead to measurement errors, necessitating costly maintenance or even process shutdown while problems are fixed. The new valve also offers a metal-to-metal seal. This provides a bubble-tight shut-off mechanism and operation over a very wide temperature range of -55 to +538o


C in its standard stainless steel form.


The H-series valve has a bore size of 1/2 inch/12.7 mm, with a Cv value of 2.6. In its standard form the valve is fabricated from 316 stainless steel, and is rated for operation at pressures up to 6,000 PSIG (414 barg). The metal to metal sealing of the new valve also meets the firesafe requirements of ISO 10497 (the international equivalent to the API 607 and BS6755 Part 2 standards).


The valve design can help process engineers achieve new levels of compactness and performance in a wide range of process and instrumentation applications involving difficult media. These applications include level measurement in refineries, chemical injection, gas lines that are prone to hydrate formation, and process lines carrying dangerous gases. The monoflange variant in particular extends application potential, as these space-saving manifolds are often favoured in sensitive applications such as skids for oil and gas platforms. By extending the bore size of monoflange needle valves to half an inch, engineers can now employ monoflange form-factor manifolds on skids handling liquid or gas media that are prone to hydrate deposition - saving considerable weight and size compared with conventional double-block-and-bleed manifolds.


Reader Reply Card No 132


Digital Pressure Gauge for Extreme Surroundings


With the Barflex, Baumer (Germany) offers a robust digital manometer with integrated data memory. In the ATEX version Barflex 4Y, it is also suitable for the use in rough and hazardous surroundings. It can measure the gauge and absolute pressure of almost all liquid and gaseous media in a range from 500 mbar to up to 1000 bar and with an accuracy of up to 0.1 % of full scale. Used as a barometer, the Barflex displays the atmospheric pressure from 200 to 1150 hPa with an accuracy of 1 hPa.


The digital pressure gauge is housed in a splash water-proof Epoxy-coated aluminium case and corresponds to the protection class IP65. It is available in a stationary and portable version and is most suitable for measurements on site. Via a standardized infrared interface, the collected data can be transferred directly to a PC. The device automatically memorises minimum and maximum pressures recallable at the display. The measurement of pressure deviations in a given time interval enables leak tests. In addition, the Barflex allows the calibration and verification of the correct operation of the installed devices as well as the verification of pressure switch and transmitter settings.


The Barflex is suitable for applications in pneumatic, hydraulic and thermodynamic areas as for example in gas engines, laboratories or maintenance. In its ATEX version, the Barflex can also be used for the petrochemical and gas industry, for example in gas underground stores, gas delivery installations or gas expansion systems.


Reader Reply Card No 196


Moisture Measurement in Natural Gas


Combining a new laser based sensor with an integrated sample system, Aurora from GE Sensing & Inspection Technologies (UK) offers a complete solution for moisture measurement in natural gas processing, transmission, and distribution. Aurora utilises tunable diode laser absorption spectroscopy (TDLAS), to deliver reliable, accurate measurement data. With process information available in seconds, users can more efficiently manage their process, reduce downtime, and increase throughput of natural gas.


“Aurora represents a new measurement platform for our gas and moisture product line,”


says Tim Povall, General Manager of Measurement Solutions at GE Sensing & Inspection Technologies. “GE’s expertise in moisture measurement technology coupled with extensive application knowledge in oil & gas allowed us to create a world class system to improve the operating efficiency for natural gas customers.”


Aurora utilises a non-contact laser light, which is selective to water molecules in natural


gas. With no sensor in contact with the gas, Aurora alerts operators of natural gas processing plants and pipeline systems when moisture concentrations are out of compliance within seconds and enables suppliers to be online faster following upset conditions. Once the process is corrected, Aurora assures the natural gas flowing back into the energy grid is sufficiently dry, meeting specifications in the minimum amount of time. Additionally, Aurora provides very accurate measurements of the moisture content in natural gas due to the highly selective TDLAS technology.


Reader Reply Card No 134


Annual Buyers’ Guide 2010


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