CP-31 Questions and Replenishment Unit?

Discussion in 'Darkroom Equipment' started by justin parker, Sep 10, 2013.

  1. justin parker

    justin parker Member

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    I have recently purchased a CP-31 with the wash and dry module off of eBay that has been pulled out of a "working environment" and is "fully tested". It hasn't arrived yet but we shall see. Since I don't have 220V wired, I am going to buy a step up transformer, probably this model:

    http://www.amazon.com/LiteFuze-LT-5...sr=8-18&keywords=120+220v+step+up+transformer

    I figure 5000W should be plenty of margin, and no harm in getting a more "beefy" model.

    The eBay listing doesn't seem to include the replenishment unit that I have seen discussed here and elsewhere. I have never seen anyone selling one of those separately, and I haven't even been able to find a picture of what it looks like. I realize it isn't needed, but I am quite curious as in the future I plan to operate this in a shared darkroom and hopefully the unit will get lots of use.

    Cheers,
    Justin
     
  2. EdSawyer

    EdSawyer Member

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    I have the replenishment unit (2 of them actuallly), its' a great addition to the CP-31. Personally I would not be without one - it's really critical to keeping chemistry topped up and fresh, and is such a nice unit that it's worth seeking one out. FWIW, I have found you can crank the replenishment rate quite low and still get great results. I think it has 9 settings, each is 5ml greater than the last. I have mine set on 2 (out of 9) I believe and it's quite conservative in chemistry use, but also still allows great results.

    I'd be a bit concerned if sharing this unit with others - They should be trained in it's use and particularly in care and cleaning of it, if you want to get a long life out of it. Replacement parts are expensive. Using it carelessly can result in paper jams, chemistry contamination, etc.

    for example, I'd hesitate to set up something like this where it would be used unsupervised, like a college darkroom or somewhere like that. It does require some care and feeding and careless use and not cleaning it regularly will result in sub-standard results and a short lifespan. It's too nice a unit for that kind of abuse... ;-)
     
  3. justin parker

    justin parker Member

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    Thanks for the info. I will definitely think twice about setting it up in a shared user space unsupervised.

    Could I trouble you for an image of what the replenishment unit looks like, and does it have its own name that I can try and use to google / save a search on eBay to find one?
     
  4. Mike Wilde

    Mike Wilde Member

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    The Fujimoto has sensors in the intake path that tell the wash dry unit and replenisher how long to run. The data is relayed using DIN plug (three pin, if I recall correctly)

    I have yet to make the interface, but my plan was to build a buffer board to drive the 120V replenshment pumps that I salvaged from a Kreonite processor.

    My North American marketed CP31 was wired for 120V service.
    Actually the pumps and electronics and drive motor ac input run on a japanese voltage of 100VAc.
    There is an oem autotransformer in mine to go from 120 to 100V . Only the heater elements (and maybe the vent fan) run at 120V.
     
  5. frotog

    frotog Member

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    Justin,
    Are you sure it needs 220v? Mine and all others I've seen take 100v.
    If using for ra-4 in a gang drkrm., you'll definitely want to find the replenisher module. Also, get or make some floating lids so that you can remove the racks at the end of the day. This is crucial to keeping the rollers intact and clean.
     
  6. justin parker

    justin parker Member

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    frotog,

    I am pretty sure you are right. Mine comes out of a lab in Texas it seems so most likely it is 120. I think the CP-31 is designed to operate (like many electronics) on either 120 or 220 based on the spec sheet I saw now. I will probably contact the seller just to be sure if it isn't clear when I get.

    Justin
     
  7. George Nova Scotia

    George Nova Scotia Subscriber

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    A quick picture of the Replenishment Unit, it's not very big. You'll also need a control cable, hoses and containers for the repl. solutions.

    31rep.jpg