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 .