Control 1-10v output based on KH director Alk level

[FMReefing]

Hi I have a Deltec CR Twin Tech calcium reactor I would like to have a 1-10v output based on my KH director reading

For example

If KH director is reading higher then 8 DKH then output 10v so it will turn off the feed pump on the calcium reactor

If kh director is below 8 DKh output 0v so feed pump is on

Is this possible?