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  1. #1
    RH Designs's Avatar
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    New Compensating Process Timer

    Here's a progress update on the new Process Timer. The big news is that it will be fully compensating for temperature changes using a sensor probe which can be placed in the tank or tray, in a water bath, or stuck to the outside of a developing tank with such as Blu-Tack. The prototype is working well and we're just tweaking the firmware to improve the ergonomics over the original ProcessMaster which by any measure wasn't the easiest device in the world to set up .

    Briefly, the spec is as follows:

    Stores up to 8 processes, each of up to 9 steps in length
    Each step can be 5sec - 2 hours long
    Optional temperature compensation over a range of approx 15-40 degrees C at a choice of rates, allowing for almost every combination of film and developer
    Optional factorial development facility for prints, increasing dev time as the dev exhausts - choice of factor from 2 - 6
    Optional display of percentage or actual time remaining
    Timer pause and resume
    Pause at the end of each step or auto advance to the next step
    Dimmable display
    Optional audible beep for agitation and during the last 10 seconds of each step
    Extra status indicators
    Footswitch

    The good news for existing ProcessMaster owners is there will be an upgrade available!

    Comments and suggestions on the above spec are welcome - I can't promise any changes will be acted upon but we will consider all of them. In particular, the sensor is currently housed in a stainless steel tube 3mm x 50mm with 1m of cable attached. It fits through the "twizzle stick" of a Paterson dev tank allowing agitation by twisting the stick, or if as I do you prefer inversion agitation, you can fit a suitable cable gland to the tank lid which allows the probe to be placed in the fluid but prevents leakage when the tank is inverted. This should work for other tanks too. See attached pics. It's not too late to change the size of the sensor housing or cable length so if you have any observations please let me know asap!

    I expect the ProcessMaster II to be available in approximately two months, at an introductory price of £149 inc VAT (£126.81 outside the EU area). I will add it to our web site shortly. You can then place advance orders - we won't take any money off you until it's ready to despatch!
    Attached Thumbnails Attached Thumbnails P4090047 (Small).JPG   P4090048 (Small).JPG  
    Regards,
    Richard.

    RH Designs - My Photography

  2. #2
    Fintan's Avatar
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    Excellent, I will take one please Richard

  3. #3
    Fintan's Avatar
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    Loud beeps please. Thin Lizzy sometimes accompany film development.

  4. #4
    arigram's Avatar
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    Sounds very nice.
    Funny that I have been making designs of my own for a Process Meter, but never though of including a thermometer with automatic compensation!

    I assume that it would work fine with a Jobo rotary processor, by just dipping the meter inside the basin. Yes, the Jobo would keep the temperature constant but the Meter having memory and steps would make it really useful just as well. Plus, sometimes you are running the Jobo at a higher than normal temperature for one reason or another.
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  5. #5
    David A. Goldfarb's Avatar
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    Sounds like a great timer. I'd be interested.

    I'm trying to think of processing sequences that I do in the dark that it might not be able to handle, but I can't think of any offhand.

    The most complicated, I suppose, might be tray or tank/hanger development where I've got multiple development times. I want to insert the first sheets in at the beginning of development, the next group after a few minutes, and then a third group a few minutes later, and I want an agitation beep every 15 sec, auto advance to the rinse for say 30 sec., and then to the fix for 3 min with an agitation beep every 1 min. If I understand the specs correctly, I could do that.

    I suppose the wash sequence could be its own program, if I wanted to do something like a standing wash sequence with an exchange of water at 1 min, 3 min, 7 min, 12 min, 20 min, and 30 min.

    And it would be good to be able to run two or more processes at once, so I could wash and start processing the next batch at the same time. I don't know if you've got that option. Different beeps for different processes.

    When I use daylight tanks, I use stainless, so I guess I could attach the probe to the outside of the tank with a couple of rubber bands. The cord would have to be long and flexible enough to allow for inversion, and durable enough that it wouldn't crack easily with fatigue over time, and that there would be a simple repair option that the user could accomplish with ordinarily available materials in case RH Designs isn't around when it becomes an issue. If the tank drips, it's also important that chemicals can't drip down the cord and short out the plug.
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  6. #6
    RH Designs's Avatar
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    Thanks for the useful feedback David -

    Quote Originally Posted by David A. Goldfarb View Post
    I want to insert the first sheets in at the beginning of development, the next group after a few minutes, and then a third group a few minutes later, and I want an agitation beep every 15 sec, auto advance to the rinse for say 30 sec., and then to the fix for 3 min with an agitation beep every 1 min. If I understand the specs correctly, I could do that.
    You should be able to all of that except the 15 sec beeps - they are every 30 sec.

    I suppose the wash sequence could be its own program, if I wanted to do something like a standing wash sequence with an exchange of water at 1 min, 3 min, 7 min, 12 min, 20 min, and 30 min.
    That could be one process, yes.

    And it would be good to be able to run two or more processes at once, so I could wash and start processing the next batch at the same time. I don't know if you've got that option. Different beeps for different processes.
    That's getting a bit complicated . You would need two timers for that really, it would be very hard to see how to do that with a single one given only one time display, and the opportunities for getting mixed up could be a problem.

    When I use daylight tanks, I use stainless, so I guess I could attach the probe to the outside of the tank with a couple of rubber bands. The cord would have to be long and flexible enough to allow for inversion, and durable enough that it wouldn't crack easily with fatigue over time, and that there would be a simple repair option that the user could accomplish with ordinarily available materials in case RH Designs isn't around when it becomes an issue. If the tank drips, it's also important that chemicals can't drip down the cord and short out the plug.
    Good points. I stuck the probe to the outside of my Paterson tank last night with Blu-Tack, failing to realise that the Blu-Tack would be warm after kneading it and so the first couple of minutes went by a bit fast! Something to put in the manual ... Once everything equalised, it was fine. If sticking the probe to the outside of the tank, stainless tanks would be better as heat conduction isn't that brilliant through plastic. The cable on our sample probe is PTFE and about 2mm diam - I think we'll probably use PVC on the production ones. Either way, it's plenty flexible enough. We'll seal the plug end of the cable as well as the sensor end. RH Designs should be around at least as long as I'm still around .
    Regards,
    Richard.

    RH Designs - My Photography

  7. #7
    RH Designs's Avatar
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    Quote Originally Posted by arigram View Post
    I assume that it would work fine with a Jobo rotary processor, by just dipping the meter inside the basin. Yes, the Jobo would keep the temperature constant but the Meter having memory and steps would make it really useful just as well. Plus, sometimes you are running the Jobo at a higher than normal temperature for one reason or another.
    It should still be just as useful with a Jobo, yes. Immersing the probe in the tank as I did with my Paterson tank should also be possible - the cable won't get badly twisted because the Jobo reverses. The only issue I suppose is whether there's enough chemistry in the horizontal tank to wet the probe properly, although the surrounding air ought to be at the same temperature!
    Regards,
    Richard.

    RH Designs - My Photography

  8. #8
    David A. Goldfarb's Avatar
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    Quote Originally Posted by RH Designs View Post
    You should be able to all of that except the 15 sec beeps - they are every 30 sec.
    Would it be hard to offer the option of 15 sec. beeps? Pyro developers often do better with agitation every 15 sec., particularly PMK, which is quite dilute.
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  9. #9
    RH Designs's Avatar
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    Quote Originally Posted by David A. Goldfarb View Post
    Would it be hard to offer the option of 15 sec. beeps? Pyro developers often do better with agitation every 15 sec., particularly PMK, which is quite dilute.
    It shouldn't be hard - I'll see what the software man says.
    Regards,
    Richard.

    RH Designs - My Photography

  10. #10

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    I'm concerned that where the top of the probe and connecting wire meet could be subject to eventual leakage, possibly rendering the devise useless. What have you done to assure a permanent water tight connection at that point?

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