Hydrogen Diode Pumps
Hydrogen Diode Pumps are also similar to standard diodes. There are two differences in construction. The first is a thicker cathode. Because hydrogen diffuses into titanium like water into a sponge, the more titanium, the more capacity for hydrogen the pump has. This absorption of hydrogen can lead to a structural problem, however. Titanium swells and distorts as it absorbs large amounts of hydrogen. Therefore, hydrogen pumps have special structural modifications to prevent distortion from causing electrical shorts.
These extra construction details make the hydrogen diode a good choice for long pump life applications. Examples might be pumps operating in radioactive environments or operation at remote locations. Recommended when the major gas load is hydrogen or hydrogen-containing gases such as water va. It also pumps other non-noble gases.
* Pumping Speed Ratings for Ion Pumps
Some pumps in this table have two pumping speeds shown, i.e., 150/100. The lower number is observed when the measurement standard established by the American Vacuum Society (AVS) is followed. The higher number is observed when the same pump is measured under optimum pumping speed conditions. Some manufacturers use the optimum pumping speed, only reporting this higher number. Both ratings are provided here to allow the customer to make an informed choice.
1 All flanges ConFlat compatible except 1,000 l/sec pumps.
2 Heaters are model IH-100 Calrod heaters which fit into matching interior heater wells in most pumps.
3 IH signifies interior heater well available as option.
4 DE specifies a double-ended option.
5 No bakeout heaters available for this pump.
6 Larger pumps available on special order.