Clean gas counts Clean gas is critical but an astronaut wouldn't thank us: one of our specialities is the removal of oxygen. We have filters to de-oxygenate carrier gas, to dry it, and to scrub it free of hydrocarbons. Capacities are generous: 150ml oxygen, 10ml water, and, to help you follow the progress of saturation,colour indicators are provided. And every filter has two separate dust filters to keep the filter medium where it belongs. They are all highly efficient, but best of all is their ease of application. Changing them is child's play, whilst the system pressure is maintained.
Chrompack Gas-clean filters They c o m e d o u b l e sealed. The first, transit seal is peeled off just before y o u fit the cartridge. The second is pierced, progressively, and fully automatically by self-actuating needle valves o n the inlet and outlet. Valves that self-seal in fact, as y o u screw home, by hand (no tool is needed), the retaining collar of the Gas-Clean cartridge. Y o u only begin exposing the filter as y o u fit it, so it can't become contaminated or partially spent in storage. Simple, fuss-free, q u i c k - a n e w filter fitted w i t h i n one minute. O u r Gas-Clean filters m a k e gases very clean. Turn over for
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CHROMPACK
Gas-clean filters, easy to fit Oxygen removal filter
Moisture removal filter
Hydrocarbons removal filter
This high capacity filter will also remove sulphur and chlorine compounds, as well as oxygen. Its capacity is a high 150 ml of oxygen before exhaustion (which is shown by an indicator changing colour from vivid green to dark brown).°With incoming gas contaminated to not more than 10 p p m this filter will bring oxygen levels d o w n below 1 p p m .
This filter removes not only water, but also oil and some other foreign matter from gas streams. Absence of water prevents hydrolysis of liquid phases, the hydrolytic attack of silanised supports and even of the injected sample. Dry gas, then, leads to clean baselines and sharper peaks, and to better reproducibility all round.
A n activated charcoal cartridge scrubs hydrocarbons out of the gas stream. Compressed air is contaminated, not only from the compressor and valve lubricants, but because the ambient atmosphere of most laboratories is relatively hydrocarbon rich.
The capacity is 10 ml of water. Saturation is shown by a coloured indicator changing from blue to pink.
A n d all three types, deoxygenation, moisture removal, and hydrocarbon removal are fitted w i t h t w o dust filters, at inlet and outlet, so no particulate filter m e d i u m , however inert, can get into y o u r C C
Life time for a continuous stream of 40 ml/min containing 10 p p m of oxygen is about one year.
Dust filtration, too
Complete filtration
Connecting unit The connecting unit holds a single filter cartridge, and can be fastened to the lab bench or to the wall (saving bench space). This unit has t w o further filters to catch any solid
Item Oxygen removal filter Moisture removal filter Hydrocarbons removal filter Connecting unit for single filter Gas-Clean unit
matter in the gas stream. T w o check valves automatically stop and restart the gas flow w h e n changing filters.
A n d as a complete filter station/pressure controller the Chrompack Gas-Clean Unit is ideal. Carrier gas, hydrogen and air lines (all 1/4" connections) are fitted to regulators and pass through filters. The carrier gas through both moisture and oxygen
Filter changes can be made w i t h o u t reducing system pressure, and w i t h a m i n i m u m of interference. There's no need to close d o w n the instrument; the only response will be a baseline reaction. Filters can be changed in under one minute.
Cat.no. 7970 7971 7972 7980 7985
Price Dfl 167 Dfl 167 Dfl 167 Dfl 299 Dfl 3354
Gas-Clean is a registered trademark of Chrompack. Recommended maximum pressure is 7 bar (100 psi).
CHROMPACK Circle Reader Service Card no.40
For technical literature and further information please contact:
Chrompack, PO Box 3, NL 4330 AA Middelburg, The Netherlands. Telephone: +31 1180 11251. Telex: 37852.
filters, and the hydrogen and air each through a hydrocarbon removing charcoal filter. Inlet and outlet pressures are displayed on dial manometers. This unit could serve up to five chromatographs w i t h clean, clean gases.
