Dispersive Spectroscopy
The dispersion of visible light into its constituent colors goes all the way back to the 17th century with Isaac Newton’s experiments, taking a glass prism and generating the characteristic…
Absorption Type Optical Analyzer
Light is known to interact with matter in very specific ways, which may be exploited as a means of measuring chemical composition. Either a sample of substance to be analyzed…
Standardized Volumetric Flow
Flow meters operate on principle of interpreting fluid flow based on velocity of fluid. Examples are Magnetic, ultrasonic, turbine, vortex flow meters
Multi Column Gas Chromatograph
Improving Chromatograph Analysis Time with Multi Column Gas Chromatograph The “Achilles heel” of chromatography is the extraordinary length of time required to perform analyses, compared with many other analytical methods. Cycle…
Chromatograph Sample Valves
Arguably, the component most critical to measurement accuracy in a gas chromatograph is the sample valve. Its purpose is to inject the exact same sample quantity into the column at…
Industrial Applications of Chromatographs
Since process chromatographs have the ability to independently analyze the quantities of multiple species within a chemical sample, these instruments are inherently multi-variable. A single analog output signal (e.g. 4-20…
Measuring Gases Concentration in Chromatograph
While time is the variable used by a chromatograph to discriminate between different species (types) of chemical compounds, the concentration (quantity) of each chemical compound in the sample is inferred…
Thermal Conductivity Detector (TCD) Principle
Thermal conductivity detectors work on the principle of heat transfer by convection (gas cooling). Here, the assumption is that sample compounds will have different thermal properties than the carrier gas.…
Flame Ionization Detector (FID) Principle
Several different detector designs exist for process gas chromatographs. The two most common are the flame ionization detector (FID) and the thermal conductivity detector (TCD). Other detector types include the…
Online Gas Chromatograph Principle
The most common type of chromatography used in continuous process analysis is the gas chromatograph (abbreviated “GC”), so named because the mobile phase is a gas (or a vapor (…
