Excel Gas & Equipments Pvt. Ltd.

Purifier Panel

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Need for Gas purification panel in Gas Chromatography has been realised now beyond any doubts both for the column & the detector. Pure gas is of utmost importance in terms of efficiency & life of the column, as well as detector sensitivity, accuracy & reproducibility of the results. It is therefore recommended that the selection of the system is done judiciously, considering all the physical & chemical properties offered by the system. Thus, one has to consider the genuinity of the materials used in the fabrication of the system, such as

Tubing material, which has to be S.S. only,
Treatment given to the gas lining for thorough cleaning,
Type of fittings used for the working pressure range,
Material of construction to withstand the operating pressure,
Quality of the chemicals used for gas purification in terms of their physical & chemical
properties, etc.

Gas Purification & Control Panel is used to remove the vapors impurities like Moisture, O2, Hydrocarbon from the UHP grade gases. The purification panel can be used for all the analytical instruments like GC, GC-MS, LCMS, AAS ICP, LCMSMS, DSG, TGA etc. It not only used to remove the impurities but also help to control the flow & pressure. The purification panel are available for all the UHP grade gases like Zero Air, N2, H2, He, Argon, Acetylene, N2O, O2 etc.

Gas Control Box

From a Gas Purification System, purified gases can be supplied to a number of Gas Chromatographs through Gas Control Boxes when each instrument requires different delivery pressure & flow. The Gas Control Box consists of ON/OFF valve & a pressure regulator to control the gas flow as well as delivery pressure & gauges to indicate inlet gas pressure from the system as well as delivery pressure to the instrument. This helps in using various types of Gas Chromatographs in the same Gas line for different types of application where the operating pressure & flow are totally different. Gas Control Box can be installed on a Wall or Instrument Table & can be supplied as per the specifications of the Customers.

Selector Box:

Standard system consists of a panel incorporating gas controls & purification traps for 4 gases in a unit, viz. Nitrogen Helium, Hydrogen & Zero Air. For certain Gas Chromatographic applications, frequent changeover of carrier gas from Helium to Nitrogen is required. For such applications Selector Box is to be used. This uses a special Gas Sampling Valve which takes care of leakage problems especially faced while using Helium.

Mini Gas Station:

Generally a Gas Purification System is supplied to cater the need for a number of Gas Chromatographs. In order to make each Gas Chromatograph operationally independent, one has to use a Mini Gas Station with each Gas Chromatograph with ON/OFF valve for each gas. These are normally fitted on the wall or the Instrument table from where the Gas Purification Panel is visible to indicate the gas inlet & the delivery pressure to the instrument.

Installation Diagram

Application	Filter Type	Max. Inlet Impurity Level	Max. Outlet Impurity Level	Length End to End	Capacity*
Moisture Removal	Silicagel / Molecular Sieve	20 ppm	< 3 ppm	10"	210 CC
Hydro Carbon Removall	Activated Charcoal / Carbon	10 ppm	< 2 ppm	10"	210 CC
Oxygen Removal	De-Oxo Chemical catalyst	10 ppm	< 2 ppm	8"	125 CC
Partical Removal	Micron Filter	25 mu	< 0.5 mu	2"

Operation Procedure:

Install the panel as per installation diagram. Open the cylinder valves of all cylinders & set the outlet pressure on cylinders regulator. Same pressure will show on the inlet pressure gauge of panel. On the outlet of panel set the pressure with mini regulator as per requirement & put on the toggle valve & you will get the flow at outlet of panel.

Leakage Test Procedure:

Open the cylinder valve on all cylinders.
Put on the toggle valves of panel.
Off the inlet valves / cylinder valve of GC ( Instrument ).
Set the pressure on cylinder regulator around 6 kg / cm2 & set the pressure around 5-6 kg / cm2 on gas purification panel by using mini regulator.
Once the Inlet & Outlet pressure of panel shows set pressure then close the cylinder valves of all cylinders & close toggle valve of panel i.e. system is under pressure from point of cylinder regulator upto point of use I.E. G.C.
Note the readings of inlet / outlet pressure gauges of panel as well as of cylinder regulator.
Wait for min. 2-3 hrs. Max over night.
If you found drop in pressure gauges then check the leakages at cylinder regulator Joints, Inlet & outlet joint of panel & distribution and line joint using soap solutions & tight the nut ferrule, if required.

Regeneration Procedure:

Moisture Trap:

High efficiency Silica gel & Molecular sieves are used for the purpose of removing moisture from the carrier gas. Silica gel is of indicating type changing its colour from blue to pink on use, having high moisture capacity. Molecular sieves are of spherical shape, yielding high mechanical strength & low dusting. Both the materials are of regenerable type.

Silica gel Material : When the colour of silica gel material changes from blue to white then it needs to be regenerated by keeping the silica gel material in oven at around 110 ⁰ C. The normal time frame for regeneration is approx. 2 – 3 Hrs.

Molecular Sieve Material : The regeneration of molecular sieve should be done along with the silica gel & the regeneration is done by heating the material in oven at around 125 ⁰ C for approx. 2 – 3 Hrs.

Hydro Carbon Filter:

Activated charcoal is used for the purpose of removing hydrocarbon impurities from the carrier as well as fuel gases, especially for reducing the errors in analysis while using FID. These materials have a very large surface area & pore diameter to adsorb large size hydrocarbon molecules.

Activated Charcoal / Carbon material should be replaced after 1 ½” to 2 years. Kept the activated Charcoal / Carbon at 110⁰ C for 2 – 3 Hrs for regeneration or its better to replace the Activated Charcoal / Carbon.

Oxytrap:

Removal of Oxygen from gases takes place only with the help of catalytic type of materials, which also work only under specific operating conditions. We use pre-treated catalyst which can be regenerated & has comparatively better activity under normal working conditions. Oxytraps are supplied with either indicating or non- indicating type of catalyst.

Regeneration or replacement of Oxytrap ( Oxygen Removal ) will be required after using of 10 – 15 cylinder of UHP grade cylinder or developed on the use & selection / use of capillary / packed column i.e. if polar column, it must to replace oxytrap & if using ECD (Detector).