An automatic dosing system is only as good as the signal it follows. The first decision is what the dose should track – pH, ORP, conductivity or live flow – because that decides whether the chemistry stays in band.
The Operating Reality
A dosing skid feeds inhibitor, scale inhibitor, biocide or coagulant into a cooling loop, boiler or wastewater stream through one or more metering channels under a single controller.
Why It Matters
Manual dosing wastes 15-25% of chemical and reaches only 65-80% concentration compliance. Automatic feed cuts waste to 2% or less and lifts compliance to 98% or higher – but only if the control signal and pump are matched to the duty.
Key Selection Points
- Metering accuracy of ±0.5% (national standard allows ±3%) via imported plunger pumps, with pulse rates above 5000 per minute for fine low-dose control.
- Control signal (pH, ORP, conductivity or flow-proportional) should be taken from the actual loop, not a fixed timer, so dose tracks make-up and blowdown.
- Twelve chemical classes supported on one skid, so inhibitor, dispersant and biocide run from a single controller.
- Wetted parts (316L, PVC, PVDF) must be compatible with every product fed, including chlorinated or aggressive make-up water.
- Safety: dry-running protection and a leak alarm within 2 seconds suit unmanned or semi-manned dosing rooms.
Selection Checklist
- Define the control signal first (pH, ORP, conductivity or flow-proportional) before sizing the pump.
- Size the metering pump to the lowest expected dose with margin, not to the peak dose.
- Confirm wetted-part compatibility (316L, PVC, PVDF) with every chemical to be fed.
- Provide containment, leak detection and dry-running protection in the room design.
- Integrate the skid with PLC, DCS or remote telemetry so dose is visible in the control room.
Related Products
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FAQ
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