Womball
Well-Known Member
- Joined
- 25/7/09
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- 68
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Gday,
I've got a three SS pot 70L system. I installed two MashMaster dial thermometers on my mash tun as I brew single/double batches. The first thermometer I installed above the ball value is to high for a single batch to give a good reading.....it's lucky to sit just in the mash itself. So, I went out a brought another and installed it on the side approximately in the middle of the level of a single batch.
Question is, on a double batch run the top always reads higher than the bottom. The usual story of my mash-in/mash-out and sparge is this (single infusion/batch sparge)...
Mash-in: Top reads around 1 degree higher than the bottom
Raise to mash out: Top seems to read correctly @ 76 degrees, bottom barely climbs above 72
Drain mash tun and sparge: Top raises to around 78 degrees, bottom might get to 74.
I thoroughly mix the grain bed after adding water for mash-out/sparge and I've also calibrated the thermometers (I have 4 and circulated both mash tun temp probes but I seem to get the same result.
I realise that the top might be higher than the bottom due to heat rising.....and all that thermal dynamics stuff, but I wouldn't expect up to a 4 degree difference.
Bottom probe sits around 60mm from the bottom of the mash tun, top sits around 120mm from the bottom. Both have 60mm probes.
Cheers,
Womball.
I've got a three SS pot 70L system. I installed two MashMaster dial thermometers on my mash tun as I brew single/double batches. The first thermometer I installed above the ball value is to high for a single batch to give a good reading.....it's lucky to sit just in the mash itself. So, I went out a brought another and installed it on the side approximately in the middle of the level of a single batch.
Question is, on a double batch run the top always reads higher than the bottom. The usual story of my mash-in/mash-out and sparge is this (single infusion/batch sparge)...
Mash-in: Top reads around 1 degree higher than the bottom
Raise to mash out: Top seems to read correctly @ 76 degrees, bottom barely climbs above 72
Drain mash tun and sparge: Top raises to around 78 degrees, bottom might get to 74.
I thoroughly mix the grain bed after adding water for mash-out/sparge and I've also calibrated the thermometers (I have 4 and circulated both mash tun temp probes but I seem to get the same result.
I realise that the top might be higher than the bottom due to heat rising.....and all that thermal dynamics stuff, but I wouldn't expect up to a 4 degree difference.
Bottom probe sits around 60mm from the bottom of the mash tun, top sits around 120mm from the bottom. Both have 60mm probes.
Cheers,
Womball.