A metering pump set to "50%" is not dosing 50% of anything until it has been calibrated. Calibration ties the pump's setpoint to a real, measured chemical flow; verification proves it is still true weeks later. Skip it and you are guessing — overspending on chemical, or quietly under-protecting the process. This is how we calibrate, verify and document every dosing pump we build.
Metering-pump output drifts — diaphragms age, peristaltic tubes relax, back-pressure changes, viscosity shifts with temperature, and a valve weeps. A pump that was accurate at commissioning can be 10–20% out months later with nothing obviously wrong. Calibration establishes the true delivered volume against the dial; verification re-checks it on a schedule so drift is caught before it costs money or compliance. Done properly, it turns the dosing equations from theory into a number you can stand behind — and it is the simplest, cheapest reliability win on any dosing plant.
A graduated column on the pump suction; close the supply, time the draw-down and read the true volume per minute against the setpoint.
Weigh the day-tank loss over a timed run — the reference method for slurries and where a column isn't practical.
Confirm the dose by its effect — pH, chlorine residual, streaming current — closing the loop on the real process target.
An inline dosing flowmeter (e.g. Coriolis) gives continuous, automatic verification with deviation alarms.
Build a setpoint-vs-output curve across the turndown so the control system knows the real characteristic, not a nominal one.
Each calibration logged with date, conditions and result — the audit trail compliance and CIP regimes need.
| Duty | Suggested check | Why |
|---|---|---|
| Membrane antiscalant | Weekly + on alarm | Loss of dose risks costly membrane scaling |
| Disinfection | Continuous residual + weekly column | Public-health critical; regulated residual |
| pH correction | Continuous pH trim + monthly column | Closed-loop, but pump drift still matters |
| Coagulant / polymer | Monthly column + jar cross-check | Dose efficiency drives chemical OPEX |
| Nutrient | Monthly + effluent residual | Balance bug feed vs consent limits |
Overdosing troubleshooting · Underdosing troubleshooting · Pump troubleshooting
We build calibration columns and verification routines into every dosing system, and can audit and re-calibrate an existing plant. Tell us what you are dosing.
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Select the regulatory standard for your country — it sets which parameters we need for a compliance-aware process assessment.
Required parameters for the chosen standard are flagged on the sample form. You can still submit a partial set and we will advise what else to test.
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