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Traps, Mist Filter Accessories. Laboratory Equipment. Liquid Handling. Bottletop Dispensers. Bottletop Burretes. Pipette Controllers. Pipette Tips. Fluid Aspiration. Page 16 Pirani Within certain limits the thermal conductibility of gases is pressure dependent. This physical phenomenon is used for pressure measurement in the thermal conductance vacuum meter according to Pirani. A self adjusting bridge is used as measurement circuit see Fig.
A thin tungsten wire is used as sensor element. Wire resistance and thus temperature are kept constant through a suitable control circuit. Page Maintenance 5 Maintenance 5. Before you begin to work, find out whether any parts are contami- nated. Adhere to the relevant regulations and take the necessary precautions when handling contaminated parts.
Page 21 Procedure a Carefully remove the grid with pointed tweezers. Page Replacing The Baffle 5. Caution Caution: dirt sensitive area Dirt prolongs the pumpdown process. Always wear clean, lint-free gloves and use clean tools when working in this area. Page Replacing The Sensor 5. Gauge failures due to contamination or wear and tear, as well as expendable parts e.
Before beginning to work, find out whether any parts are contami- nated. Caution Caution: vacuum component Dirt and damages impair the function of the vacuum component. Page Returning The Product Form under www. When returning a product to Pfeiffer Vacuum, put it in a tight and impact resistant package. Page 30 —2 Above 10 p hPa Pirani range Indication range above 10 Freon 12 —1 Water vapor —2 —3 —2 —1 4 6 8 4 6 8 4 6 8 4 6 8 hPa Caution A mixture of gases and vapors is often involved.
In this case, accurate determination is only possible with a partial-pressure measuring in- strument. Print page 1 Print document 32 pages. Rename the bookmark. Delete bookmark? Cancel Delete. Delete from my manuals?
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