Jobo CPE2+ Bottle Sizes when using 2551 drum

I developed 3 rolls of 220 C-41 film tonight in a 2551 drum in my (new to me) Jobo CPE2+ with "upgraded" motor. The minimum solution required is 640mL so I tried using 850mL to be on the safe side. The bottles that seemed to be designed to fit the CPE2(+) have only a 600mL capacity. I thought I would be clever and use instead 1000mL Jobo bottles that I have on hand. However, I ran into the problem that once I had emptied a chemical out the big bottle could no longer be put back in the slot as it would simply float out. This meant the water level decreased since the volume of the bottle(s) was no longer being displaced. To start with I was processing using the chemicals one-shot so I was dumping each chemical. On a related note, how do CPE2(+) owners temper the water for the rinse step + the final rinse / stabilizer solutions. There doesn't seem to be enough slots (just 4) and then 4 graduated cylinders. For what do people use the graduated cylinders? Does anyone opt to purchase a separate tempered water bath just to keep rinse water, and chemicals for the next run?

I am new to posting on APUG, but a longtime lurker. Thanks in advance for some guidance!

-Justin

I always used the graduated cylinders for the chemistry, and the bottles to temper the water for rinsing.
Guessing that doesn't really help you, given your use of 850ml chemistry (the cylinders are 260ml).

So the 1000mL bottles fit ? Do they reach the correct temp, as they aren't completely submerged ?

lordvader said:

So the 1000mL bottles fit ? Do they reach the correct temp, as they aren't completely submerged ?

Click to expand...

Yes the fit. The fluid doesn't rise that much above the water level and I measured the developer temperature in the bottle and it seemed fine. I don't have much baseline for comparison to if I did it the other way.

Have you got the standard smaller size bottles. Why not fill them with water and put them in the slots where the larger bottles were when they were warming up. That will raise the water level without any problems.

If I'm using a 3 chemical kit, I utilize the spare bottle slots to hold water. I also start tempering running water in a nearby sink so that the beakers can be refilled as I've emptied.

Weight the bottles. You need around 600 grams because that is the typical displacement volume. A lead collar would do, but it is unwieldy.

I usually use a spare bottle full of water, but anything to displace the volume works. A 600ml bottle for example.

The 2551 Jobo tank requires 330ml minimum for 2502 reel with one 120 roll inside the red tab.
The 2551 Jobo tank requires 640ml minimum for 2502 reel with five 35mm rolls, six 120 rolls or three 220 rolls inside the red tab.
The 2551 Jobo tank requires 560ml minimum for 2509N reel with twelve 4"x5" sheets.