Actually there need to be a level in the condensate tank before starting the saline detector pump, unless you have a water circulation loop on the condensate hot well. The goal is to detect any amount of chloride above system spec. in the condensate water prior to discharging it back to feedwater system. I believe that as long as theirs a level in the hot well and the water circulator pumps are providing cooling to the condenser then the saline detection pump should be running as well.