Ok I have a working and tested solution.
It is not going to move the slider on your dos, but it will move the slider on a virtual outlet which will keep the dos off and set an alarm until you reset it. Just think of it like a master switch.
1) Create a virtual outlet, I named mine
MIX-RESET and add the new virtual outlet to your dashboard
2) Add this programing to MIX-RESET:
Set ON
If mxbnlo open Then OFF
When OFF > 000:05 Then OFF
3) Add this line to your dos programing:
If Error MIX-RESET Then OFF
Or
If MIX-RESET OFF Then OFF
(Either should work but the error will have a 5 second delay, I tried both)
4) Add this line to your Email_Alarm:
If Error MIX-RESET Then ON
5) Go to your dashboard and set the MIX-RESET slider to ON Then back to AUTO.
You must set it to ON before setting it to AUTO every time it trips or it will continuously trip.
I did it this way so that the outlet would show you when the mixing station is operational or "ON" by illuminating the ON above the outlet. ON in orange with the slider set to auto is what you want to see.
When the mxbnlo sensor is open (dry) for 5 seconds it will set the slider for the MIX-RESET outlet to off and put the outlet into an error state.
This will shut your dos off, turn your alarm on, and send an alert.
Your dos will not turn back on until your reset the MIX-RESET outlet by first adding water to close the mxbnlo sensor and then setting MIX-RESET outlet slider to ON and then back to AUTO.