Analytical Instrumentation & Environmental Monitoring


Vaporising regulator increases the reliability of gas chromatograph analysers

September 2019 Analytical Instrumentation & Environmental Monitoring

With the Tescom 44-6800, Emerson has introduced a vaporising pressure reducing regulator for gas chromatograph analysers with the option to separate the regulator body from the electronic enclosure, without compromising hazardous location certifications. This design provides protection to the regulator’s electronics from the extreme high temperatures found in petrochemical refineries and processing plants.

Designed for sample conditioning systems for online gas chromatography analysis, the new regulator promotes greater reliability and accuracy in sample testing results, while simplifying system commissioning, reducing maintenance and enabling remote and local monitoring to meet global process requirements. The device works by ensuring the carefully controlled delivery of single-phase vapour samples of hydrocarbon mixtures to a gas chromatograph (GC) where the sample is separated and its physical properties analysed. Obtaining precise and reliable values from the GC, such as the measurement of natural gas BTUs, can lead to substantially improved refinery efficiencies.

Separability ensures optimum performance

Unlike traditional vaporising regulators, the 44-6800 series separability enables the user to detach the electrical housing – which contains sensitive electronics, power supply and temperature adjustment dial – from the regulator body. This can then be installed in a lower temperature environment, preventing sensitive electronics from being exposed to ambient temperatures exceeding 65°C. Separability, coupled with high tolerance to voltage spikes and extreme ambient temperatures, ensures optimal performance and safety in locations rated as hazardous. The series is available in two body material options: 316 stainless steel and nickel alloy that provide maximum corrosion resistance for added value and long-term reliability.

“Optimal plant operation relies on accurate analytical results, and our customers seek absolute reliability in their gas chromatography sample conditioning systems, something that may be compromised when electronics are exposed to high temperatures inside heated cabinets, or when using vaporising regulators with inferior heat transfer technology,” said Laura Schafer, vice president of sales, precision fluid control, Emerson. “With its innovative design, we have boosted the reliability of sample conditioning systems so that our customers do not have to worry about the quality of their samples.”

The regulator is designed for a flow capacity of 0,02 and pressures up to 415 bar. It is offered in both electric and steam versions. Emerson is launching the new series specifically for sample conditioning systems used in on-line gas chromatography analysis in oil, gas, petrochemical and chemical applications.

Patented heat transfer technology preserves sample integrity by preventing condensation of heavier components from occurring during pressure reduction. Temperatures can be precisely controlled using the single-turn heater control dial and the regulator is also equipped with a PID controller for precise heater temperature control.

Remote monitoring has become mission critical for the oil and gas industry. The Tescom 44-6800 features an industry standard 4-20 mA analog output to enable remote monitoring of the heater temperature and for data acquisition. Signals can be output to modulating field devices, PLCs, and scada systems, amongst others, to achieve the networked goals of Industry 4.0 applications. The series also has the option for an LED screen for local monitoring in the field.

Certification adheres to the global requirements of the CSA (Canadian Standards Association), ATEX (ATmosphere EXplosibles) and IECEx (International Electrotechnical Commission) certification to T3 (200°C) rating, along with the National Association of Corrosion Engineers MR0175/ISO 15156 standards for the use of materials in hydrogen sulphide bearing environments. In addition, the regulator offers global flexibility with its 100-240 VAC, 50/60 Herz design supported by voltage spike protection.

For more information contact Devesh Roopnarain, Emerson Automation Solutions, +27 11 451 3700, devesh.roopnarain@emerson.com, www.emerson.com



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