What are the types of detectors?
- UV Flame Detectors
- IR Flame Detectors
- UV and IR Flame Detectors
Are there different types of gas detectors?
What is the best type of gas leak detector?
- Semiconductor detectors. Semi-conductor sensor detectors are made of metal oxide specially designed to react to gas. ...
- Explosimeters. Explosimeters use pellistor sensors, which consist of a wire coated with a catalytic substance, platine.
- Optical detectors. ...
What are the detectors used in gas chromatography?
In gas chromatography:
- Thermal conductivity detector, (TCD). Measures the thermal conductivity of the eluent.
- Electron capture detector, (ECD). The most sensitive detector known. ...
- Photoionization detector, (PID). Measures the increase in conductivity achieved by ionizing the effluent gas with UV radiation.
- Olfactometric detector. ...
What is a multi gas detector?
MULTI-GAS DETECTOR This is an instrument used for evaluating the tank atmosphere, prior to man entry, specifically for the presence of toxic gas. Hollow, glass tubes are inserted into a hand-held bellows pump through which a metered volume of the sample to be tested is drawn.
What are the detectors used in GC?
There are several different types of detectors used in gas chromatography.Gas Density Balance. The gas density balance detector, or GDB, measures the density of the present gases. ... Thermal Conductivity Detector. ... Flame Ionization Detector. ... Thermo Iconic Detector. ... Flame Photometric Detector.
Is the most widely used and generally applicable detector for GC?
Flame ionization detectors (FID) are the most generally applicable and most widely used detectors.
Which detector for GC is the most sensitive?
Electron capture detector, (ECD). The most sensitive detector known. Allows for the detection of organic molecules containing halogen, nitro groups etc.
Which is the universal detector in GC?
In the current detector market, the mass spectrometer has been accepted as the most universal detector for gas chromatography with capabilities of both trace quantitative and definitive qualitative information.
How many types of GC detectors are there?
There are three types of detectors in UV / Vis, namely fixed wavelength detector, variable wavelength detector, and a diode array detector.
What is GC FID used for?
GC with flame-ionization detection (FID) is widely used for lipids analysis. Sample preparation for this technique includes preseparation of lipid classes, hydrolysis, derivatization, or pyrolysis. GC can also be used for direct separation of triacylglycerols based on the carbon number (CN).
What is difference between FID and tcD detector?
the basic principle of FiD is the ionization of organic compound by burning the compounds in the hydrogen air flame. Meanwhile, the detection of compound by tcD is based on the difference of thermal conductivity properties between the carrier gas and the target being detected.
Why is FID not a universal detector?
The FID has good sensitivity and, with few exceptions, is a universal detector for organic compounds; but since all organic compounds give a response, it is not very selective and co-eluting components in a sample will interfere with the analysis.
Which types of detector is not used in GC?
Explanation: UV visible spectrometric detector is not used in gas chromatography. It is used in liquid chromatography.
Which of the detectors are the two most common detectors on commercial GCs?
Nowadays, most GCs come with all three detectors i.e. Thermal Conductivity Detector (TCD), Elector Capture Detector (ECD) and Flame Ionization Detector (FID) for analysis of CO 2 , N 2 O and CH 4 , respectively from the same air samples.
Which detector is known as universal detector?
In parallel, gas chromatography/flame ionisation detection (GC/FID) has been used as a universal detector for the more volatile analytes.
Which detector is used in gas chromatography Mcq?
Explanation: Flame ionization detector has high sensitivity to all organic compounds. It is the commonly used detector for gas chromatography.
What factors make a good detector for a GC experiment?
The important characteristics of chromatography detectors are as follow:Sensitivity.Linear range.Preferably Non-destructive.Adequate stability and reproducibility.Good range of temperature.High reliability.Low noise.Small peak value to avert peak broadening and the resultant loss of resolution.More items...•
Which type of detector is not used in GC?
Refractive index detector is not a common datector for gas chromatography because it is used in HPLC.
Which is the most commonly used detector in HPLC?
UV detectorUV detector is a very commonly used detector for HPLC analysis. During the analysis, sample goes through a clear color-less glass cell, called flow cell.
What is the mechanism of a hydrogen-air flame?
Mechanism: Compounds are burned in a hydrogen-air flame. Sulfur and phosphorous containing compounds produce light emitting species ( sulfur at 394 nm and phosphorous at 526 nm). A monochromatic filter allows only one of the wavelengths to pass. A photomultiplier tube is used to measure the amount of light and a signal is generated. A different filter is required for each detection mode.
How do solutes interact with a detector?
As solutes elute from the column, they interact with the detector . The detector converts this interaction into an electronic signal that is sent to the data system. The magnitude of the signal is plotted versus time (from the time of injection) and a chromatogram is generated.
How are electrons supplied in a detector cell?
Mechanism: Electrons are supplied from a 63Ni foil lining the detector cell. A current is generated in the cell. Electronegative compounds capture electrons resulting in a reduction in the current. The amount of current loss is indirectly measured and a signal is generated.
How are ion detectors maintained?
Mechanism: The detector is maintained under vacuum. Compounds are bombarded with electrons (EI) or gas molecules (CI). Compounds fragment into characteristic charged ions or fragments. The resulting ions are focused and accelerated into a mass filter. The mass filter selectively allows all ions of a specific mass to pass through to the electron multiplier. All of the ions of the specific mass are detected. The mass filter then allows the next mass to pass through while excluding all others. The mass filter scans stepwise through the designated range of masses several times per second. The total number of ions are counted for each scan. The abundance or number of ions per scan is plotted versus time to obtain the chromatogram (called the TIC). A mass spectrum is obtained for each scan which plots the various ion masses versus their abundance or number.
What is the mechanism of ionization?
Mechanism: Compounds eluting into a cell are bombarded with high energy photons emitted from a lamp. Compounds with ionization potentials below the photon energy are ionized. The resulting ions are attracted to an electrode, measured, and a signal is generated.
What is the name of the detector that detects solutes?
Detectors that exhibit enhanced response to specific types of solutes are called selective detectors. Most detectors require one or more gases to function properly.
What is a TCD detector?
THERMAL CONDUCTIVITY DETECTOR (TCD): Mechanism: A detector cell contains a heated filament with an applied current. As carrier gas containing solutes passes through the cell, a change in the filament current occurs. The current change is compared against the current in a reference cell.
