How to Test Wine for Sulfite (SO2) Video

The video above shows How to Measure Sulfite (SO2) in Wine using the SC-300 (or the SC-100A). Using the SC-300 is easy, quick and very accurate way to measure your Sulfite (SO2) levels in your wine, even in red wines! Make that Big Red you always have wanted or that masterful blend and prevent its spoilage with Vinmetrica’s SC-300. The SC-300 also has the ability to measure pH and TA in one instrument, the ultimate winemaker’s companion.

9 thoughts on “How to Test Wine for Sulfite (SO2) Video

  1. Like Greg said above, using my SC-300, I first push the power button on, then change to SO2 mode, and my screen never says to PRESS ENTER
    like it shows in the video. This is after doing my calibration and TA test using the other electrode and then removing it and securing the SO2 electrode to my SC-300. According to the video, after turning on the power and changing to SO2 mode by hitting the mode button, it should tell me to PRESS ENTER. Instead, the screen goes right to 0.0 and the proceed lights up green. Can I assume something is wrong?

    1. John,

      Thank you for reaching out to us. You are correct, the video does have the “Press Enter” function on the SC-300. Due to recent updates on the look of the instrument itself and the firmware on the instrument, all new instruments being sent out do not have the “press enter” notification for the SO2 mode. A bit of a backstory… Our original instruments had only one connector at the top of the instrument (all current models come with two) and if you mixed up the electrodes and attached the pH electrode while in SO2 mode, the pH electrode would get too much power sent to it and it could ruin the pH electrode. That is why we originally installed the “Press Enter” function so that our customers could try and avoid ruining their pH electrode. The Press Enter served as a reminder to make sure your SO2 electrode was attached instead of your pH electrode. The new instruments are designed to skip this step because there are now two connectors and there is no way the electrodes could get mixed up when attached. If you instrument, when in SO2 mode, reads 0.0 you are ready to test. Just make sure your SO2 electrode is hooked up and you are all good to go.

      Does this help answer your question? If you have any other questions or need help with anything please feel free to respond here or you can email us directly: or call us 760-494-0597 and select tech support.

      Let us know if need anything else.

      Take Care,

  2. Hello! Is there any video to show me how to test the total So2 and not just the free one?

    1. Fernando,

      We do not have a video for testing for Total SO2 but the instructions for how to perform the test are located towards the back of your SC-100, SC-100A or SC-300 manual. If you need additional help or instructions please just let us know.


  3. My meter will not tell me to hit enter. I’ve turned off and on and still nothing. Any suggestions?

    1. Greg,
      Thank you for your inquiry. Just to confirm a few things first. Make sure your are gently swirling the probe in the solution the entire time you are calibrating the instrument. It might take 30 sec to a minute for it to reach a stable value. Once the instrument settles on a stable value the CAL led should start blinking signaling you to press the Enter button. If you are doing all of these steps correctly and the CAL led still does not blink our Tech Support might be able to help you out with a few more tricks. They can be reached at 760-494-0597.
      Thank you.

  4. I need to replenish my supply of titrant, reactant, and acid solutions. I can’t seem to find a place in Vinmetrica to place an order.
    Can you help me place an order.

  5. On your sulfite test video for your SC-100 …. the blurring of the sample wine bottle label is a little distracting. Maybe just show the label or take the sample from the wine bottle and put the bottle off camera. Not really a big deal.

    1. John, well, it was done after shooting and I didn’t want to re-shoot it, so I had it blurred out. Anyway we are now on to the latest generation of the SC series so that video is pretty much out of date. And, we are making/testing our own wine, so we no longer have to worry about offending anyone else’s reputation.

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