Water & Wastewater Instrument Calibration
Water utilities and treatment plants measure to report. Abstraction volumes, distribution input, treated effluent flow and dosing rates all end up in a submission to an authority or in a non-revenue water calculation. The instruments live in hard conditions — buried chambers, aggressive media, intermittent flow — and drift is normal rather than exceptional.
Typical measurement points
Abstraction and distribution input
The figures that define both licensed volume and the top line of every water-balance calculation.
District metering and non-revenue water
Losses are inferred by subtracting one meter from another, so a small error in either becomes a large apparent loss.
Treated effluent discharge
Reported discharge volume is a permit condition; the flow meter behind it is the evidence.
Chemical dosing rates
Dosing accuracy drives both compliance and chemical cost. Low-flow dosing points are among the most commonly mis-measured in the plant.
Level and DP-derived level
Reservoir and tank level, and the pressure instruments that infer it, including wet legs that no longer hold their fill.
Apparent water losses that are really metering error, sending crews to hunt leaks that do not exist Electrode coating on electromagnetic meters in wastewater, quietly suppressing the reading Partially filled pipes making a full-bore flow measurement invalid regardless of calibration Low-flow dosing points operating below the meter's reliable range Reported permit figures resting on instruments with no calibration record
Abstraction licence and discharge permit reporting Evidence supporting non-revenue water and water-balance figures Quality and environmental management system requirements Traceable records for instruments used in regulatory submissions
Calibration procedures follow ISO/IEC 17025 methodology; ESYD accreditation is in progress.
Related services
Common questions
Tell us about the measurement point you need checked
Describe the instrument and your plant, and we will tell you what can be verified in-situ, what needs a workshop calibration, and what it will take.
Keep your instrumentation performing at its best
Speak with SEMAC's service team to discuss your maintenance needs and plan your verification & calibration service.