Which APD helium compressors (HC series) are compatible with older APD cold heads such as the DE-202-B (two-stage)?

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what is the simplest definition of ion exchange capacity

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--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

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02 March 2021 0 0 View

Eugenio Urquiza

This suggests that the HC-2 is compatible with the ADP DE-202: http://www.eas.slu.edu/GGP/fullpapers/sdarticle304.pdf

Thanks @Rajendra Singh. There's also an electrical cable that apparently controls the phasing between the components and might also power the cold head valves (not sure). So I think determining compatibility is a little more complicated than just the pressure setting and connection -- but that's certainly part of it. I'm hoping we get a comment from someone that has seen this combination in the past. I'm currently leaning towards the HC-2DR, which has a built in electrical cable that looks like it will fit the DE-202-B.

Varadarajan Sridharan

HC-2 compressor and DE-202 forms a pair. This is for sure as I am using it. The letter following DE-202 should be denoting modification at the external portion of second stage to suit a specific application. This may see it from ARS website http://www.arscryo.com/DE-202.html. Electrical cable (between the compressor and cold head) connections would differ in a majour way depending upon if the cold head is operated at 50 or 60 Hz as the cooling capacity is higher in the latter case. Let me know

Thanks Varadarajan! I am curious as to how long these compressors last. Have you seen compressors with more than 30,000 hours? Have you seen any degradation in performance?

Yes, the comressor that I caught hold of had seen typically 28,500 hours. I started using the same. But I cleaned the oil filter before anything. That is all I did. Fortunately, no helium leak (touchwoood!). Using a diffusion vacuum system, I was able hit 13K just in 30 min. After having put the sample holder and heater and carrying out some more modifications, I could reach 13K in 50 min. Still good.

Thanks for the blogpost website. I agree on most of the points mentioned there. You may also get hold of USERs manual from offical web site of the company- coldedge.