Im not sure how to adjust it to get to the numbers on the VPD chart . Any help in understanding how to work the numbers properly. Thanks
4 Likes
If you’re using the controller 69 this should help.
https://acinfinity.com/pages/controller-programming/vpd-mode-triggers.html
4 Likes
Im adjusting temperatures and humidity according to the chart. But my Kpa numbers are off and I don’t understand why.
3 Likes
Check this out.
4 Likes
Thanks. Question for you about the controller
69 pro, Did you adjust any of the calibration settings on it ? Maybe I set something up wrong, and now im getting off readings. @nacho151
4 Likes
I use an IF thermometer and 2 Thermometer Hygrometers to adjust my settings and use the average readings to adjust the offset for heat and humidity. I hope that helps! @Dog_Fart1 probably could explain VPD a lot better than I can. To check humidity reading you can also take a Ziploc Baggie place a little water in it and place your probe in the bag without submerging the probe sensor and see if it takes you to 100% humidity also. I don’t really worry to much about VPD as long as my temperatures and humidity are in the range for the stage of growth.
4 Likes
Hey @greyalien44
VPD is a fairly new term to me to, @Slym3r may be able to enlighten you to it. If my memory serves correctly, you might have an airflow issue if your VPD is out. Lets hear from the other growers.
5 Likes
That is pretty much what I did. I Used my little digital electronic temperature humidity meters to see how accurate there sensor was. Was pretty much what the little meters said and the thermal temperature meter read. Thank you. @nacho151
4 Likes
Trying to ask questions and Trying to figure out what I thought I understood. Until I got my new controller 69pro i never seen my actual VPD numbers . So i figured I was on point Until now. Thanks @chrisj
4 Likes
I thought if i kept the temperature and humidity in this range my readings would be on point. The only difference that I can think of is i have really no offset temperature for the leafs . Its of by 1 not 5 .
This is my reading.
3 Likes
Thanks @nacho151 im actually checking out the pulse.co Vpd charts. And i think i might know what may be my problem. Me lol. It has a very good explanation on how to apply and adjust parameters. So I’ll see if it works. Thank you as always for all your help.
6 Likes
Turn your exhaust up that’s how I bring down the VPD normally one of two thing has fixed it either turn up the fans or down the humidifier either way I hope you get it figured out
6 Likes
Problem solved. Im a idiot. I set the offset leaf temperature in the wrong direction. I finally was able to look at all my settings without one of my children distracting me .and realized I had it set 1 up instead of down,and it made a significant difference in my readings. Sorry that I made anyone else crazy with my mistakes. Thank you for everyone’s help.
9 Likes
Well im glad thats figured out. If i can help, i am here.
6 Likes
Im sure I will have plenty of stupid things to ask about. And thank you for all the help. @Slym3r
6 Likes
Also make sure you have an air - tight room
7 Likes
glad you got your answer !! please is there a cheap "leaf temp "device ?
7 Likes
I just use a laser temp gauge from harbor freight. Less than $20
9 Likes
thanks !!! need to get one
5 Likes
