How to measure ph of Ca Reactor with ph controller

I just purchased a Milwaukee Ph Controller and with to use it with my
My Reef Creations CR-4 Calcium Reactor. First, I may be incorrect but
I had the idea that the way these work is they turn off the solenoid
of the Ca Reactor when the Ph drops too low (I have been told it is
6.5). I know I could mount the probe simply in the sump and look for
that to stay around 8.0 but yet I would think it's best to monitor the
effluent. The thing is from what I can see the way the controller
works with the setpoint it turns on the power (to the solenoid) when
the ph goes below the setpoint whcih seems to be opposite of what I'd
want. Am I correct about this?
My other question, like I said how do I measure the effluent? There
is nowhere to hook this into the reactor. The only idea i have come
up with is something like a small plastic cup with suction cups that i
can place in my sump and run the effluent hose into. That way I can
just place the ph probe in that to measure the effluent and it will
flow over the top as effluent continues going into the cup but I don't
know where I can buy something like this but I imagine I can find a
place to purchase the cup and as well suction cups. What are others
doing for this purpose though?