Dave, Any possibility of sharing what you indtend to use the equipment for on the rig? I am a mining engineer in the cement industry and have considered placing remote electronics on drilling rigs and the mining equipment. Too many other fires to hold back in the meantime have kept me from pursuing this..
I recently came across some ruggedized gear for mining equipment using open hardware and a linux OS. I am not advertising for this company but you can see examples of the cases at 3d-p.com. The price point they quoted was a bit high (IMO) on a per unit basis for trial work I was considering. Brian On Sat, Jul 23, 2011 at 3:06 AM, Erik Christiansen <dva...@internode.on.net>wrote: > On 22.07.11 10:30, Dave wrote: > > Interesting.. so did you have to make any design changes to meet the > > 95% RH requirements?? > > No, the LED clock dissipated enough heat to avoid condensation at 95% > RH. With purely dissipative dropping of the 12v to the <2v across each > display segment, it effectively had an inbuilt heater. The PCB was > covered in solder resist, which excluded moisture from circuit tracks, > as well. > > [...] > > > I wasn't aware of the load dump situation. Fortunately my past mobile > > work has used a 12 to 24 volt inverter to drive the control circuits, > > otherwise that probably would have been an issue. > > As it still lives, the inverter is either adequately protected, or > hasn't experienced a load dump yet. If there's a hefty lead-acid battery > in your equipment module, then it would probably absorb a load dump from > the alternator, if it's in good nick. (Internal impedance low.) > > Erik > > -- > Westheimer's Discovery: > A couple of months in the laboratory can frequently save a couple of > hours in the library. > > > ------------------------------------------------------------------------------ > Storage Efficiency Calculator > This modeling tool is based on patent-pending intellectual property that > has been used successfully in hundreds of IBM storage optimization engage- > ments, worldwide. Store less, Store more with what you own, Move data to > the right place. Try It Now! > http://www.accelacomm.com/jaw/sfnl/114/51427378/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Magic Quadrant for Content-Aware Data Loss Prevention Research study explores the data loss prevention market. Includes in-depth analysis on the changes within the DLP market, and the criteria used to evaluate the strengths and weaknesses of these DLP solutions. http://www.accelacomm.com/jaw/sfnl/114/51385063/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
