Virnmetrica SC300 SO2 Stop point

Winemaking Talk - Winemaking Forum

Help Support Winemaking Talk - Winemaking Forum:

Mar 10, 2021
Reaction score
Hi everyone, I tried out my SC-300 today and it seems like a great piece of kit, but I did have a clarifying question about when to stop the free SO2 test...

The manual says to stop when the reading goes above 50, and there are 20 consecutive beeps.

I just wanted to confirm that you stop the first time this occurs? I.e. you don't keep going until it stays above 50? I noticed after a while (more than 20 beeps), it would eventually drop back down below 50, and the proceed light would return.

Thanks in advance!


Supporting Members
Jan 29, 2014
Reaction score
Food Industry - - Retired
I look at the second hand on the clock and look for the drop where it beeps for twenty seconds. This normally means there is a prior drop which peaked about 100 > decayed within fifteen seconds > and I add just one more drop while mixing > or maybe have to do one more drop twice.

I never try to keep the reading over fifty forever. When I am titrating I normally see some drift/ buffering toward the last reading. The buffering is greater if there are visible solids.
Last edited: