Thank you for the experience / instruction! Em ter, 9 de jul de 2019 12:05, <cdel...@juno.com> escreveu:
> Luiz, > Ch1-75 Hydrogen storage details. > “The compound LaNi5H, is used for storing molecular hydrogen. > The LaHi5H, is characterized by high hydrogen partial pressure (2 to 5 > atmospheres) at +(20-50) degrees C. > 250 grams of the compound contains 18 liters of hydrogen at normal > pressure. > It is sufficient for maser continuous operation for more than 40 000 > hours.” > I believe that the container holding the LaHi5H is heated and > thermostatically controlled to maintain the proper pressure into the > purifier. > First you should be able to power up the maser just far enough so that > the ion pumps can operate. Monitor their current and it should drop down > to almost zero within a few hours. If not you may need to get the ion > pumps rebuilt. > There are commercial outfits that can rebuild them but if there are not > isolation valves to close and isolate the Maser when you remove the ion > pumps you will not be able to proceed! Since the Russian Masers also use > a getter pump in concert with the ion pumps, opening up the vacuum system > will contaminate the getter pump. The process of clearing the getter is > very detailed and involves temperatures of up to 800 degrees C, and > without careful instructions on how to do it you risk damaging other > portions of the Maser! > If the pressure does drop down, then you need to determine if there is > any Hydrogen left. I know that some Russian Masers will give you an alarm > that tells you if you are out, and some have a mechanical pressure gage, > but I’m not sure about the CH1-75. You will need to check the manuals. If > it does not provide an alarm or have a gage then see if the HFO > oscillator is working and if the discharge bulb is lighting up. If it > lights up you are not out of Hydrogen! > If it does not light and you have determined that the lack of Hydrogen > is indeed the problem you will need to locate the LaHi5H container. After > you locate it make sure it is being heated, this could cause an apparent > lack of Hydrogen! Then see how it is connected to the discharge bulb. > Hopefully it will be a threaded connection. This connection is on the > high pressure side of the purifier and can be removed without > compromising the vacuum. You will need to remove the container and > recharge it. I would instead replace it with a small compressed hydrogen > cylinder and regulators. > Use ultra-high purity dry Hydrogen and make sure you purge the line > going to the purifier. The purifier will block other gases from getting > into the Maser but in the process too much “foreign” gas can contaminate > and damage the purifier! > Once you manage to locate the container some pictures on where it’s > hiding would be nice! > Good luck with your efforts! > Cheers, > Corby Dawson > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.