50 Measurement and Testing Complete analysis of sulphur compounds inhazardous
area zones I and II using Ex d certified solution Natural gas is a natural resource present deep below the surface of the earth. In order to use and ensure the quality and profitability of natural gas, it is necessary to control its composition, which can vary depending on where it is extracted. Even if it is composed mostly of methane, natural gas contains some traces of sulphur compounds which can affect its quality and can have dramatic effects for its transportation (e.g. corrosion of the pipes). Therefore, companies that work with natural gas control the level of sulphur compound impurities as well as adding specific Mercaptans to make it odorised and easily detectable in case of a leak. For this purpose, Chromatotec®
has developed and manufactures the energyMEDOR® which measures and analyses the sulphur compounds generally present in the natural gas: H2
Mercaptans. This new instrument is designed to work in hazardous areas as defined by ATEX zone 1 criteria without any purge gas required for operation. The MEDOR®
capable of detecting sulphurs as low as 1 ppb.
This certified solution has been designed to operate in zone I and II and can be used with 230V, 115V and 24V DC power supply making it quite unique on the market. For More Info, email:
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Innovation partnership creates new low cost solution to telemetry communication
Churchill Controls have recently launched their latest innovation, the Mega Link telemetry system, which is enhanced and partnered with the Mega Bridge IP communicator. This is a low-cost, versatile telemetry communication system for passing two-way instrumentation, measurement and control data between industrial plant and equipment, distributed over wide geographical areas and remote locations.
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Mega Bridge adds flexible and fully featured internet protocol
(IP) connectivity to the well-established Mega Link family of telemetry and control units used to pass two-way instrumentation, measurement and control data between equipment and industrial plant. IP connection scenarios range from simple self-contained Local Area Networks (LAN), Wide Area Networks (WAN) to multiple networks anywhere across the internet for distributed geographical areas and remote locations.
Instead of a USB cable connected from the user’s laptop running DUCX configuration and diagnostics software, the laptop’s USB port is connected to a Mega Bridge unit operating in DUCX Bridge mode. The Mega Bridge will handle the setting up of a secure communication path with a dedicated message server to each of the respective Mega Bridge units, wherever they may be located in the world.
This cutting edge innovation was possible thanks to an impressive collaboration. For the past 24 months Churchill Controls have been engaged on a Knowledge Transfer Partnership (KTP) project with The University of Reading, part funded by Innovate UK. Churchill Controls have over 4 decades of providing cost effective solutions to the problems of monitoring and controlling remote industrial plant and this, combined with the additional collaboration from the KTP, resulted in providing the level of R&D needed to develop the highly innovative Mega Bridge.
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Tunable Diode Laser Absorption Spectroscopy (TDLAS) offers cost effective solution to ensure
plant and pipeline integrity Near-infrared and infrared tunable diode laser absorption spectroscopy (TDLAS) have garnered much attention for their three key attributes: specificity, high sensitivity, and fast response speed. The specificity is the result of the extremely high spectral resolution it can achieve. The second attribute results from the ability to rapidly tune the lasers, so techniques like wavelength modulation spectroscopy (WMS), can be easily implemented. And, because TDLAS is an optical technique, it offers very fast response speeds. The high specificity, sensitivity, and response speed of TDLAS make it very suitable for a variety of process measurements. TDLAS is especially well suited for monitoring carbon dioxide (CO2 liquefication. Its laser-based CO2
drift, compared with other techniques such as gas chromatography. CO2 diluent in oil and gas reservoirs that can act with H2 threaten steel pipelines. Measuring CO2
S and H2 natural gas can contain as much as 30% CO2 . There are significant advantages to using TDLAS-based technology for measuring CO2 in a natural
gas stream versus gas chromatography. Those advantages include the speed of the response, and low maintenance requirements. Similarly, TDLAS analysis provides higher accuracy and selectivity than either near infrared or infrared photometry.
measurement also is important in maintaining the efficiency and performance of natural gas liquefaction plants. Natural gas entering the plant often contains contaminants that must be reduced to ensure satisfactory plant performance. Several treatment processes are available for the removal of CO2
CO2 from feed gas, each has its advantages and limitations. Regardless of the process used, process optimisation requires measurement of the CO2 before
and after purification of the feedstock. Additionally, the complex process that transforms the natural gas into a liquid involves very-low-temperature operations, which can result in CO2
out on the exchanger surface, plugging lines and reducing plant efficiency. Ametek’s 5100 TDLAS is an extractive-type CO2
Online Gas Analyzer Experts
Sulfur compounds, VOCs and Odorants Monitoring in Hazardous Areas
Odor monitoring in industrial and urban areas auto GCs for online monitoring of VOCs/BTEX in air, water or soil
Unique solution for monitoring in hazardous areas Wall mounted Exp or CSA cabinet
for installation in refineries and petrochemical environment
Continuous measurement at low concentration levels ppb / ppm / %
Compliant with EN 14662-3 No interferences with BENZENE Mcerts certified and US EPA approved
Phenol BTEX Styrène VOCs Odorants c 40 YEARS OF EXPERTISE t freeze analyser. No sample conditioning is required.
The instrument utilises a fully integrated sample handling system and a sealed reference cell for continuous on-line analyser verification. The 5100 also employs digital signal-processing methods that allow for the implementation of multivariate calibration and can accurately measure two separate species with completely overlapped spectral responses. Some measurement combinations relevant in natural gas operations are CO2
and water, and CO2 and methane.
Pipelines currently are the most common method for transporting large quantities of natural gas over long distances. There are currently over 1,500,000 miles of dedicated pipelines used to transport natural gas in the United States for transmission and distribution. Minimising the water content in the pipelines is critical to prevent pipeline corrosion.
If water is present it will react with the CO2 to from carbonic acid, or H2 S to form sulphuric acid.
Both acids can corrode pipe, potentially leading to safety risks, lost product, or environmental pollution incidents. Historically, electrochemical detectors have been used to monitor the water level in the samples. This type of sensor degrades over time as it is exposed to low level organic components.
With Ametek’s 5100 TDLAS system, the detector element does not physically interact with the pipeline gas and, therefore, there is no change in the system response relative to the sensor contamination.
VOCs analyzer
www.chromatotec.com -
info@chromatotec.com airTOXICBTX PID in Exp cabinet ANNUAL BUYERS GUIDE •
WWW.PETRO-ONLINE.COM
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Gas chromatography offers high sensitivity, but it has the disadvantage of a slow response time. Mass spectrometers can quickly measure multiple components but may have a significant total installation cost. A TDLAS analyser provides real-time monitoring with a data acquisition rate of two seconds and is significantly less expensive than both gas chromatographs or mass spectrometers.
S, DMS, DMDS and Ex d solution is one of the only instruments capable of analysing all previously mentioned sulphur compounds in hazardous areas without purge gas thanks to the MEDOR® is an ideal solution for these applications since it only needs a very small amount of zero air or nitrogen to operate (down to 4 mL/min) and its MEDOR® wet cell detector.
The alternative method would be Flame Photonic Detector (FPD) technology, which requires hydrogen and air for the flame and a large volume of purge gas to operate in hazardous areas. Chromatotec® energyMEDOR®
’s wet cell Sulphur Specific Detector is
) levels during natural gas processing and
sensor offers faster response time, large dynamic range and low is a naturally occurring
O to form corrosive compounds that concentration is required at processing plants and natural
gas custody transfer points to ensure the levels are low enough to meet quality specifications for pipeline transportation. Pipeline levels of CO2
should be no more than 2%-3%, while well head
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