Cycles of Concentration from Conductivity
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Nobody meters makeup and blowdown on a routine service call — they dip a conductivity probe in the makeup line and again in the basin, and divide. Dissolved salts carry current, they do not evaporate, and they concentrate in lockstep, so 2400 μS/cm in the tower against 400 μS/cm in the city water means the system is running at exactly 6 cycles. The same probe is what the blowdown controller uses: set a 2400 μS/cm setpoint and the solenoid opens whenever the basin drifts above it.
Two traps catch people. First, conductivity meters are temperature-compensated to 25 °C — a hot basin and a cold makeup tap read on different bases unless compensation is on, and a 10 °C error is worth roughly 20% on the reading. Second, if you dose an acid or a conductive inhibitor, that chemical shows up in the tower reading but not in the makeup, inflating the apparent cycles; that is precisely why many programs cross-check against a non-reactive tracer such as chloride.
- = Cycles of concentration
- = Tower water conductivity
- = Makeup water conductivity
- Cycles of concentration — Cycles of Concentration from Chloride, Boiler Cycles of Concentration
- Tower water conductivity — Water Resistivity and Conductivity, TDS Estimated from Conductivity (TDS = k × EC)
- Makeup water conductivity — Water Resistivity and Conductivity, TDS Estimated from Conductivity (TDS = k × EC)