Evan Parker wrote: > Is there a device sold or easily built that will temper a water bath to 68 > degrees, or at least somewhere near that? If so, where could I buy such an > item, or where may I obtain the schematics to build it? I'm having a tough > time with temperature control with my film developing. Tom & Emily cover the basic and specific solutions. There are many thermostatic mixing valves on the market. eBay is a decent source for used ones. I bought mine from a national supply/repair company for commercial processors who happen to be headquartered near here. I bought two and picked the best parts. Works well for tempering the water consistently to the desired temperature. When the room temperature is warmer than the "soup" I cool it with freezer cold packs and water in a stainless beaker. When the room temperature is cooler, I use a waterbed heater. This works for about 20 minutes because the thermostat has too large a tolerance. But that is long enough for most film developing sessions. I've been told that I can hardwire a more exact thermostat to the heater pad. One that has a +/- 1/2º F. tolerance would be ideal. Jobo's heater unit for their CPA & CPP units would be an excellent alternative. Peace! Sidney -- God said, Let there be light! Divine Light: Photography by Rev. Sidney Flack 2507 E. 2nd Street Tulsa, OK 74104-1903 http://www.divinelightphotography.com
