Stop DOS from Dosing when 2part containers are almost empty

Hi,
I am using a Neptune DOS to dose 22ml of each 2part per day using its built in programming. In addition to the built in programming, via using the ADVANCED programming section, I want to add code to permanently shut OFF the DOS with a when statement until I replenish both the ALK/CAL containers. I use a Neptune optical switch located at the bottom of the ALK container called swALK. Since both my ALK and CAL are dosed equally, I am only using only one optical switch to detect when both containers need refilling. Does this code do what I want if placed in each of the Advanced sections of my ALK & CAL dos:

If swALK OPEN Then OFF
When OFF > 0:01 Then OFF

Any suggestions or should I add other failsafes?
Thanks,