Process gas chromatograph is rugged

The latest process gas chromatograph from Emerson Process Management confirms the Rosemount Analytical Model 700 as a rugged field-mounted process transmitter.

The latest process gas chromatograph from Emerson Process Management confirms the Rosemount Analytical Model 700 as a rugged field-mounted process transmitter, capable of turning process analysis into an everyday field measurement.

The Model 700 removes the operational complexity of chromatography measurement on site, and significantly reduces the installation and operational expenses previously associated with these instruments.

Designed to provide precise and reliable compositional data across the spectrum of process applications, the Model 700 uses a range of detectors to measure gases at concentration levels from a few percent, down to parts per billion.

By design, the Model 700 offers significant CAPEX and OPEX savings.

The latest Emerson innovation of an airless heat sink oven eliminates the operational cost of supplying the constant clean air flow needed in a traditional air bath oven, saving an estimated yearly air cost of GBP 4000 per transmitter, based on 80 to 140 litres/minute consumption.

Designed to operate across ambient temperature conditions of -29 to +60 deg C, and with an IP65 rating, the Model 700 may in many instances eliminate the need for a special heated or air conditioned analyser shelter.

Where extreme ambient conditions do make some environmental protection necessary, the specification of the Model 700 means that only basic cooling and protection is usually needed.

The customer is assured of outstanding operational performance by rigorous factory testing and temperature cycling of every unit, which may be customer witnessed if required.

Now further expanding the Model 700 application capability are two new detectors - a Micro-FID Flame Ionisation Detector and a Flame Photometric Detector (FPD), plus a liquid sample injection system.

The Micro-FID Flame Ionisation Detector is designed to measure trace hydrocarbons in process gases and liquids at ppb (parts per billion) levels, as well as for ambient air monitoring.

The Micro-FID also permits measurement of trace carbon monoxide and dioxide in ethylene, propylene and other polymer-grade feedstock, by using the Model 700 micro-packed methanator accessory to convert the CO/CO2 to methane, which is then measurable to ppb levels.

The new Flame Photometric Detector (FPD) module enables measurement down to trace levels of sulphide compounds - typically lower than 50 ppb.

Finally the Model 700 now has an expanded capability to measure liquid hydrocarbon samples, using the heated liquid sample injection valve, which vaporises such samples in a heated chamber before transferring the vapour to the column oven.

This is useful for monitoring sample streams prone to polymerisation such as styrene, dicyclopentadiene and 1,3-butadiene.

The Rosemount Analytical Model 700 Process Gas Chromatograph is an example of the Emerson commitment to transmitter based analytical technologies.

The company is the world's leading manufacturer of on-line gas chromatographs: the legendary reliability of Rosemount Analytical gas chromatographs sets the standard of performance in the industry.

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