Other Gas Chromatograph from Galvanic

Gas Chromatograph - PLGC II

Gas Chromatograph The model 843 Sulfur Gas Chromatograph is a laboratory analyzer that measures sulfur components in vapor samples. Sulfur separations are made iso-thermally in a temperature-controlled oven (temperature ramping is optional). Capillary columns of inert silco-steel are used for sulfur separation. These columns provide long life and trouble free operation. The 843 is controlled with Peak Simple® Chromatography software on a standard PC or laptop. The Peak Simple® software allows extensive printed reports, chromatographs and storage of multiple analysis methods. Galvanic's analyzers measure total sulfur in liquids and sulfur components via gas chromatography in vapor samples. Some chemiluminescence applications: Refined petroleum liquid products LPG and LNG products Pipeline natural gas and odorization systems Refinery and plant fuel gas Gasoline and diesel Carbon dioxide monitoring for beverages Ethylene and propylene

Chromatography

Sulfur chemiluminescence can be used to measure total sulfur in a wide variety of hydrocarbons, ranging from methane to diesel fuel, by simply injecting the sample directly to the detector and measuring all of the sulfurs simultaneously. For gaseous samples, the installation of a chromatograph column prior to the detector allows the measurement of individual sulfur compounds. Since the detection method is equimolar, in response to all sulfurs, a chemiluminescence detector can easily be designed as a chromatograph or as a total sulfur analyzer.

Sulfur chemiluminescence offers a number of advantages over other sulfur detection systems which make the detector simple to calibrate and use in a wide variety of applications:

• Linearity from ppb to percent concentrations

• Sulfur specific, no known interferences

• Single component standard used for calibration

• Equimolar response to all sulfurs

• No nuclear / X-ray source

• Electrically heated reaction, no flame required

• Low hydrogen consumption

• Not subject to quenching from hydrocarbons

Detector Sensitivity - Gas Chromatograph

Sensitivity was measured by making a small partial pressure injection of a 0.8 ppm COS standard. The detector was able to detect 5 ppb of COS with a signal to noise ratio of 10 to 1.

Calibration

Due to the reactive nature of sulfur compounds, calibration standards containing multiple sulfur components are normally unstable. This is particularly true at the lower ppm levels. The equal and selective response to sulfurs from the “Sulfur Chemiluminescence Detector” allows the standard to be made up with a single least reactive sulfur component in an inert background gas such as nitrogen. This standard is then available for on-line auto calibration and reference check functions eliminating most of the expensive technician time required for other calibration methods commonly used only in the lab.

Conventional flame photometric detectors (FPDs), commonly used for sulfur measurement cannot be calibrated in the same manner because the individual sulfurs within a total sulfur peak all respond differently to the detector. A separate response factor would be required for each, which makes calibration costly and time consuming.

Configuration and Monitoring

The 842 and 843 include a Windows program for system configuration using Modbus protocol. The user can configure alarms, range, streams and valve times as well as monitoring system operation real time.

The system supports modem interface, uploading and downloading capabilities. The manual and help files are supported in the PC package.

Click here for the complete brochure on the 843 Sulfur Gas Chromatograph (PDF - 402K)

Click here for the Application Sheet (PDF - 19K)

Also check out Galvanic's 902 Gas Chromatograph