I'm formulating my very first all grain porter recipe from scratch and planning on using a Grainfather to do this. I would appreciate feedback on this recipe and in particular the mash. I can do a more complicated step mash if that would give better results.
I'm limited in the variety of the grains I have on hand, but I have enough in stock to alter the quantities.
I also have a reasonable selection of hops, including Citra, Chinook, Centennial, Columbus, Cascade, East Kent Goldings, Mosaic and Simcoe. So, I could change the hopping if my choices seems inappropriate. I'm unsure if I want to dry hop this or not. I was thinking I'll evaluate fermenter samples and if it seems like it needs more aroma, throw in a handful of Citra (possibly into the keg)
Rye Porter - Robust Porter (12B)
Batch Size 23 L
Boil Size 26 L
Boil Time 60 min
OG 1.056 sg
FG 1.014 sg
Bitterness 37.6 IBU (Tinseth)
Color 72.3 ebc (Morey)
Name Amount Yield Colour
Gladfield - Ale Malt 3.000 kg 79% 6.0 ebc
Gladfield - Aurora Malt 2.200 kg 79% 50.0 ebc
Gladfield - Rye Malt 1.000 kg 81% 7.0 ebc
Gladfield - Light Chocolate 0.500 kg 71% 950.0 ebc
Total grain: 6.700 kg
Name Alpha Amount Use Time Form IBU
Centennial 10.5% 20 g Boil 60 min Pellet 20.7
Kent Goldings 5.5% 30 g Boil 30 min Pellet 12.5
Kent Goldings 5.5% 40 g Boil 5 min Pellet 4.3
Name Type Form Amount Stage
Safale S-05 Ale Culture 1.00 L Primary
Name Type Amount Temp Time
Mash In Infusion 20.100 L 55 C 10 min
Step 1 Temperature --- 65 C 1 hr
Mash Out Temperature --- 77 C 15 min
Sparge Infusion 11.800 L 75 C 15 min
This one has me scratching my head. I have a hydrometer calibrated for 20C, one refractometer calibrated for 20C and another refractometer with ATC. A few months ago I checked the hydrometer with filtered tap water at 20C and it was reading bang on at 1.000
Today I was playing around with the refractometers and put a drop of the filtered tap water on the ATC model. It was reading less than 0%. I checked the temperature of the water and cooled it slightly to 20C, then used the water sample with the hydrometer and it was reading 0.998. The ambient temperature was 22C and the refractometer calibrated to 20C was also reading less than 0% Brix.
Why would that be? Why would all three instruments tell me that the SG of my filtered tap water is not 1.000? In fact, all three actually agree in the magnitude, since the refractometers were reading about -0.5% Brix
Is there a simple DIY method for ball-park sanity check/calibration of low pressure gas gauges?
Something along the thermometer 0/100C, icebath/boiling water trick.
I only have one regulator with high and low pressure gauges. I am starting to suspect the value shown by the low pressure side. Most people talk about using 10-20psi in their setups. I find that I get my optimal results in the 20-30 range. I have no issues with how my beers pour, but it would be nice to know whether the actual CO2 pressure is anywhere near what the gauge is actually reporting.