Advanced metering pumps delivering flow rates from 0.1 to 10,000 L/h at accuracy within ±1% — consistent, repeatable chemical delivery that holds the dose on target as conditions change.
The right pump sets achievable accuracy and turndown.
Flow-paced and residual-trim control to hold the dose.
Demand-based dosing from real-time flow and sensors.
Size dose rate, pump capacity and chemical consumption online.
Chemical is one of the largest running costs of any treatment plant, and over-dosing wastes reagent while under-dosing breaches consent. Precision dosing — the right metering pump, properly calibrated and held on target by the control loop — keeps the dose where the chemistry needs it. We specify pumps for the duty, verify accuracy on commissioning, and design in the turndown so the system stays precise across the full flow range.
What Precision Dosing Delivers
Precision is more than a headline accuracy figure. It is repeatability shot-to-shot, linearity across the turndown, and stability as suction conditions, viscosity and back-pressure change. We select diaphragm, peristaltic or progressive-cavity pumps to match the reagent and duty, size them with margin without sacrificing low-flow resolution, and calibrate against a measuring cylinder or calibration column on site so the displayed dose is the delivered dose.
Metering pumps specified and calibrated to deliver the set dose within ±1% across the working range.
Pump and control sized so dosing stays precise from minimum night flow to peak.
Consistent, pulse-managed delivery shot-to-shot for stable downstream chemistry.
Calibration columns and bench checks confirm delivered volume against the set point.
The Failure Modes We Design Out
A metering pump rated to ±1% in the catalogue will not hold it on site unless the whole system is right. These are the issues we engineer out.
Hypochlorite and other gassing reagents lose prime — degassing valves and the right pump head keep delivery true.
Loading valves and pressure-relief hold a stable head so output does not drift with system pressure.
Lime and polymer need pump types that handle solids and viscosity without losing accuracy.
How We Achieve and Hold Precision
The target dose comes from stoichiometry or jar testing, converted to a pump output with the dosing equations.
Calibration column, degassing and flooded suction keep the pump primed and linear.
On-site calibration verifies delivered volume against the set point.
Residual or analyser feedback confirms the dose is achieving its treatment target.
Indicative performance we design to
| Pump type | Typical turndown | Accuracy | Best for |
|---|---|---|---|
| Solenoid diaphragm | 10:1 | ±2–3% | Small, clean-reagent duties |
| Motor-driven diaphragm | 100:1 | ±1% | General coagulant / acid / alkali |
| Peristaltic | 100:1 | ±1% | Gassing, abrasive (lime, hypochlorite) |
| Progressive cavity | 50:1 | ±1–2% | Viscous polymer solution |
Plant and tools for this duty
Diaphragm, peristaltic and progressive-cavity pumps matched per reagent and duty.
Learn MorePump, calibration column, control and containment factory-built and wet-tested.
Learn MoreWhy Choose Reynolds & Bauhm
Explore the Dosing Knowledge Hub
Our engineers size storage, pumps, injection, control and containment to your measured duty — then build and commission it.
Our expertise spans multiple industries with sector-specific water treatment solutions.