WATER QUALITY
FLOW &
DETECTION
ISO 7027-compliant 860nm nephelometry achieving 0.01 FNU minimum detection for drinking water compliance; pH glass electrode conditioning with ultra-high-impedance buffer exceeding 10¹²Ω for low-conductivity source water; luminescent optode DO phase fluorescence interface for biofouling-resistant wastewater and aquaculture monitoring; OIML R 117 Class 2 electromagnetic and multi-path ultrasonic flow metering; acoustic leak correlator DSP with pipe-material-specific cross-correlation parameterisation for cast iron, ductile iron, MDPE, and uPVC; DMA minimum night flow analysis firmware; SDI-12, Modbus RTU, HART 7, and SCADA historian integration; free ammonia speciation firmware from measured TAN, pH, and temperature for RAS aquaculture toxicity management.
The Engineering Problem
Water Quality Electronics Fails at the Sensor Impedance, the Fouling Characteristics, the Acoustic Pipe Physics, or the Regulatory Measurement Method — Often All Four Simultaneously
A pH buffer amplifier at 10⁸Ω rather than 10¹²Ω reads correctly at 500µS/cm but drifts 0.15-0.3 pH units in soft source water at 20µS/cm where electrode output impedance approaches 10MΩ at 10°C. A Clark cell DO sensor achieving ±0.1 mg/L in clean river water has its membrane colonised by biological film within 72 hours in a wastewater aeration tank, producing positive DO bias of 1-2 mg/L per day. An acoustic leak correlator that works on 150mm ductile iron mains produces correlation peaks too broad to locate a leak on 300mm MDPE because acoustic velocity in MDPE is 340 m/s versus 1,400 m/s in ductile iron, and the algorithm was parameterised for metal pipe. Getting water quality electronics right requires understanding measurement physics at a depth most off-the-shelf specification sheets do not require.
Three waves are driving demand for genuinely engineered water quality electronics. Water utilities facing a global 30% non-revenue water average need integrated DMA pressure, flow, acoustic leak detection, and smart meter AMI analysis that SCADA operations can act on in real time. Drinking water regulators moving from periodic laboratory sampling to continuous in-line monitoring as primary compliance evidence need hardware whose measurement data meets the method compliance and data integrity standards that regulatory inspectors will accept. Land-based RAS aquaculture scaling to mainstream production needs continuous multi-parameter monitoring with the precision, response time, and reliability to prevent ammonia, DO, and CO2 excursions that cause mass mortality within hours.
Ankh designs water quality monitoring hardware from the water matrix and regulatory measurement method outward — starting with the specific water composition, the regulatory standard (ISO 7027, EPA Method 180.1, Standard Methods), the fouling characteristics of the deployment environment, and calibration traceability requirements — working backward through sensor selection, signal conditioning noise floor, temperature compensation, anti-fouling system design, calibration management, and SCADA integration. Water and wastewater utilities, environmental monitoring vendors, industrial water treatment companies, drinking water compliance vendors, aquaculture technology companies, and water quality hardware startups all need a custom electronics engineering partner with genuine analytical chemistry depth and operational calibration engineering capability.
Water Quality, Flow & Leak Detection Categories We Build
From ISO 7027-compliant drinking water turbidity monitors to acoustic correlator DSP electronics for MDPE distribution mains to luminescent optode DO systems for RAS aquaculture to OIML R 117 custody transfer flow metering — every water application, every measurement parameter, every regulatory framework.
Drinking Water Quality Monitoring Systems
Wastewater & Environmental Water Monitoring Electronics
Flow Measurement & Revenue Metering Electronics
Acoustic & Pressure-Based Leak Detection Electronics
Industrial Process Water & Produced Water Monitoring
Aquaculture & RAS Water Quality Monitoring Electronics
Swimming Pool & Recreational Water Quality Electronics
Smart Water Meter & AMI Leak Detection Electronics
Electrochemical Sensor Signal Conditioning
Glass pH electrode signal conditioning with ultra-high-impedance input buffer exceeding 10¹²Ω for accurate measurement in low-conductivity waters below 100µS/cm, where standard preamplifier input impedance introduces systematic error; ISFET solid-state pH for applications requiring no fragile glass membrane; three-electrode amperometric Clark cell DO with membrane diffusion temperature compensation; luminescent optode DO phase angle measurement for biofouling-resistant monitoring in wastewater and aquaculture; free and combined chlorine amperometric conditioning; conductivity from 0.01µS/cm ultrapure water to 100mS/cm brine with two-electrode and four-electrode configurations; ISE signal conditioning for nitrate, ammonia, fluoride, and calcium with ionic strength adjustment buffer management; differential pH electronics for dissolved CO2 monitoring in aquaculture.
Optical & Spectrophotometric Measurement
ISO 7027-2016 compliant 860nm near-infrared nephelometry with 90° scatter geometry (±2.5°) achieving 0.01 FNU minimum detection; USEPA Method 180.1 white-light nephelometry for US regulatory compliance — and the specific optical engineering difference between the two methods that prevents substitution across regulatory frameworks; UV254 absorbance for DOC surrogate, disinfectant demand proxy, and aromatic organic monitoring without reagents; multi-wavelength UV-Vis spectrophotometry for simultaneous nitrate, nitrite, COD, and colour; fluorescence excitation-emission electronics for CDOM, tryptophan-like organics, and harmful algae chlorophyll; oil-in-water fluorescence at 340nm for petrochemical effluent; dual reference channel ratiometric correction for LED ageing and window fouling.
Flow Measurement Physics & Metering
Electromagnetic flowmeter signal conditioning from Faraday-law EMF with pulsed DC excitation for reduced electrolytic noise in low-conductivity water; multi-path ultrasonic transit-time interface with chordal path velocity profile correction for OIML R 117 Class 2 custody transfer accuracy; single-path clamp-on ultrasonic for non-intrusive installation; Doppler ultrasonic for wastewater and slurry with particle and bubble content; ultrasonic level measurement for open channel flow with Manning firmware; differential pressure transmitter electronics for orifice, Venturi, V-cone, and Annubar primary elements; Coriolis flowmeter interface for mass flow and density; AMR pulse output and AMI communication module for utility meter data collection.
Acoustic & Pressure Leak Detection
Acoustic correlator DSP implementing inter-channel cross-correlation from pipe-coupled hydrophone or accelerometer sensors for leak location by time-delay estimation; broadband signal conditioning 10Hz to 5kHz with programmable gain; material-specific acoustic velocity parameterisation — cast iron 1,200 m/s, ductile iron 1,400 m/s, MDPE 340 m/s, uPVC 400 m/s — for frequency-weighted correlation appropriate to each pipe material; coherence function evaluation for SNR and signal quality assessment before correlation; correlation peak quality scoring and confidence reporting; DMA pressure monitoring with high-frequency sampling for burst detection; minimum night flow analysis for leakage quantification; smart meter overnight consumption profiling for household-level leak detection below 1 litre per hour.
Sensor Fouling Compensation & Management
Optical window wiper motor drive with configurable cycle and torque monitoring for turbidity, UV, and fluorescence sensors in biologically active waters; compressed air purge electronics for bubble and particle removal from optical paths; ultrasonic piezoelectric cleaning drive for anti-biofouling on underwater acoustic instruments; mechanical brush wiper motor control and position feedback for submersible sonde cleaning; sensor response drift detection firmware generating fouling flags before drift exceeds measurement specification; dual reference channel ratiometric correction for LED ageing and window fouling; heated inlet electronics preventing biological growth in warm-water deployments.
Calibration Architecture & Traceability
NIST and NPL-traceable calibration methodology for pH, turbidity, dissolved oxygen, and conductivity; certified reference material management firmware for multi-point calibration procedures; temperature and pressure compensation polynomial storage across the full deployment temperature range; Formazin primary turbidity standard preparation and dilution management for ISO 7027-compliant calibration; automatic in-situ calibration sequence management with standard injection electronics; calibration drift rate monitoring and alert before specified drift threshold; calibration event logging with standard batch number, expiry date, and operator ID for regulatory audit trail; field calibration kit interface for on-site recalibration.
SCADA & Platform Integration
SDI-12 sensor interface firmware for compatibility with Campbell Scientific, Onset, and In-Situ environmental monitoring dataloggers; Modbus RTU and TCP slave firmware for water utility SCADA and process control integration; HART 7 smart water quality transmitter device variable and diagnostic communication; WaterML 2.0 and OGC Sensor Observation Service for hydrological data platform and national environmental network integration; MQTT and REST API for cloud water quality platforms; OSIsoft PI and Ignition SCADA historian integration; EPA WQX data output format for regulatory environmental data submission; ISA-18.2 alarm management principles applied to water utility SCADA alarm rationalisation.
Regulatory Method Compliance
ISO 7027-2016 nephelometry electronics with 860nm wavelength and 90° geometry for EU Drinking Water Directive compliance; USEPA Method 180.1 white-light nephelometry for US Safe Drinking Water Act — and the specific optical engineering distinction that prevents one sensor design from satisfying both simultaneously; OIML R 117 and EU Measuring Instruments Directive 2014/32/EU water meter accuracy for utility billing and custody transfer; Standard Methods for the Examination of Water and Wastewater method compliance awareness; EU Drinking Water Directive 2020/2184/EC and US SDWA 40 CFR Part 141 monitoring requirements; EPA NPDES effluent monitoring for wastewater discharge compliance.
Chipsets & Platforms
Platforms, ICs & Standards
Tested silicon and proven stacks — no experimental platform dependencies.
Drinking Water, Treatment Plant & Regulatory Compliance Monitoring
ISO 7027 860nm Nephelometry. 0.01 FNU Detection. Formazin Primary Calibration. Residual Chlorine. pH 10¹²Ω Buffer. UV254. Regulatory Data Record.
Drinking water quality monitoring failures are measured in public health events — the 1993 Milwaukee Cryptosporidium outbreak infecting 403,000 people resulted directly from turbidity monitoring failures where filter breakthrough went undetected until treated water entered the distribution system. ISO 7027 specifies 860nm near-infrared wavelength because mineral and organic particles scatter near-IR with less colour interference than visible wavelengths; 90° scatter geometry ensures comparability between manufacturers; and Formazin primary standard is specified because its optical properties can be prepared to an absolute concentration defined by chemistry. A Method 180.1 white-light sensor cannot produce ISO 7027-compliant readings and cannot satisfy regulatory submissions requiring ISO 7027 compliance. Ankh designs drinking water quality electronics from the regulatory method specification outward: ISO 7027-compliant 860nm nephelometry at 0.01 FNU, free chlorine amperometric at ±0.03 mg/L, pH with >10¹²Ω buffer at ±0.02 pH down to 20µS/cm, UV254 for DOC surrogate, and regulatory data records with ISO method flag and calibration certificate reference for DWI, EPA, and EA submission.
Flow Measurement, DMA Monitoring & Acoustic Leak Detection Electronics
OIML R 117 Class 2. Electromagnetic & Ultrasonic. DMA MNF Analysis. Acoustic Correlator. Material-Specific Parameterisation. Smart Meter AMI.
Non-revenue water — the global average of 30% of network input — costs the water industry an estimated USD 39 billion annually. In MDPE pipe at 340 m/s acoustic velocity, a 200m sensor spacing produces a 0.6-second time delay requiring 60 seconds of signal collection for 0.017Hz frequency resolution, versus 0.17 seconds in cast iron at 1,200 m/s. High-frequency attenuation restricts the useful correlation bandwidth to 10-200Hz in MDPE versus 10-1000Hz in cast iron, requiring longer collection periods and narrower-band filter design to achieve acceptable location precision. Ankh designs flow and leak detection electronics spanning electromagnetic flowmeter signal conditioning with OIML R 117 Class 2 accuracy, DMA boundary flow meter telemetry with minimum night flow analysis, acoustic correlator DSP with material-specific velocity parameterisation for cast iron, ductile iron, MDPE, and uPVC, and smart meter overnight consumption profiling identifying household leaks below 1 litre per hour.
Wastewater, Industrial Water & Aquaculture Monitoring Electronics
Luminescent Optode DO. UV-Vis COD Surrogate. TAN Free NH3 Calculation. Oil-in-Water Fluorescence. RAS Sub-10min Alarm. SDI-12 & Modbus.
A biological treatment tank at 35°C with MLSS at 3,000-5,000 mg/L is the most sensor-fouling-hostile aquatic environment in commercial use. Clark cell DO sensors degrade through biological film penetration producing positive DO bias of 1-2 mg/L per day; luminescent optode DO sensors measuring phase fluorescence lifetime avoid this mechanism and achieve 14-day service intervals in activated sludge. In RAS at maximum stocking density, TAN concentration alone is not the toxicity indicator: the Henderson-Hasselbalch equilibrium between non-toxic NH4⁺ and toxic NH3 depends on pH and temperature — at pH 7.5 and 20°C, 2.5% of TAN is free ammonia versus 0.5% at pH 7.0 and 15°C. A fixed TAN alarm threshold that ignores pH and temperature will miss toxic NH3 at high pH and temperature. Ankh calculates free ammonia continuously from measured TAN, pH, and temperature, alarming on the toxicologically relevant species at the species-specific chronic toxicity limit, with sub-10-minute critical DO alarm response validated to on-call staff notification.
Why Water Quality Engineering Teams Choose Ankh
Water Chemistry as the First Design Input — Not the Last Validation Test
In low-conductivity source water at 20µS/cm, the pH electrode output impedance approaches 10MΩ at room temperature and doubles at 5°C — a buffer amplifier at 10⁸Ω rather than 10¹²Ω introduces 1% error at room temperature and 2% at 5°C. Ankh characterises the water matrix before selecting a single sensor: conductivity range, temperature range, organic content, particle size distribution, and target analyte concentration range are the first design inputs, so the signal conditioning architecture achieves the accuracy the specific water chemistry requires rather than the accuracy listed for deionised water at 25°C.
Fouling as an Operational Engineering Constraint, Not a Cleaning Schedule
A DO sensor membrane fouling in 72 hours in wastewater is a sensor mismatched to its deployment environment — not a sensor with a 72-hour maintenance interval. Luminescent optode DO with biofouling-resistant material and automated mechanical wiping is the right choice for continuous wastewater aeration monitoring; Clark cell amperometric sensors with permeable membranes that biological films penetrate are not. Acoustic correlators deployed on plastic PE mains need frequency-weighted cross-correlation with material-specific acoustic propagation models, not the cast iron algorithm in most commercial correlators. Ankh designs sensor selection, anti-fouling electronics, and signal processing for the specific deployment environment — not the clean-water laboratory where specifications are measured.
Acoustic Leak Correlation From the Propagation Physics, Not the Cross-Correlation Algorithm
Acoustic propagation velocity determines the entire correlator timing budget: cast iron at 1,200 m/s, ductile iron at 1,400 m/s, MDPE at 340 m/s, uPVC at 400 m/s. In MDPE, the same inter-sensor distance produces a time delay 3-4× larger than in iron pipe, requiring correspondingly longer signal collection periods for equivalent frequency resolution. High-frequency attenuation in plastic restricts the useful correlation bandwidth to below 200Hz in MDPE versus 1kHz in cast iron, demanding wider sensor spacing limits and longer collection periods. Ankh designs acoustic correlator electronics with sensor bandwidth, collection period, sampling rate, and material-specific algorithm parameterisation for the specific pipe material and diameter of each installation.
Regulatory Method Compliance as a Design Specification, Not a Post-Hoc Claim
ISO 7027 specifies 860nm ± 60nm wavelength, 90° ± 2.5° scatter geometry, and Formazin primary standard calibration. A turbidity sensor with a 630nm LED and 45° scatter geometry does not produce ISO 7027-compliant measurements and cannot serve as primary compliance instrumentation under EU Drinking Water Directive or EPA SDWA, regardless of specification sheet NTU claims. EPA Method 180.1 uses white light (400-680nm) rather than near-infrared 860nm — a colour-bearing sample appears different to each method, and a Method 180.1 sensor cannot be substituted for ISO 7027 in EU regulatory monitoring. Ankh designs water quality measurement electronics to the specific regulatory method from LED wavelength and photodetector geometry through Formazin calibration procedure.
Multi-Parameter Distribution Network Water Quality Monitor — 240 Locations, 99.4% Data Completeness, DWI Acceptance
Continuous multi-parameter water quality monitor for 240 locations across a large urban distribution network — requiring ISO 7027-compliant nephelometry, free chlorine conditioning, ±0.02 pH accuracy at 50µS/cm soft-water conductivity, automated 7-day in-situ calibration, DWI-compliant data records, and LoRaWAN telemetry from 240 points to 8 city-wide gateways.
ISO 7027-compliant 860nm nephelometry at 0.01 FNU with Formazin primary standard calibration and optical window wiper; free chlorine amperometric at ±0.03 mg/L; pH with 10¹²Ω buffer achieving ±0.02 pH at 50µS/cm; automated in-situ calibration at 7-day intervals; Modbus TCP integration with the utility's AVEVA System Platform historian; DWI compliance data records with ISO 7027 method flag, calibration certificate reference, and operator ID; LoRaWAN from 240 monitoring points to 8 city-wide gateways.
- 99.4% data completeness across 240 monitors over 12-month period — LoRaWAN ADR managing signal quality across urban terrain from 8 city-wide gateways
- DWI regulatory acceptance as primary compliance monitoring instrumentation — data record format accepted as equivalent to laboratory analysis for distribution monitoring
- 30-day deployment interval between maintenance visits validated — optical window wiper achieving fouling resistance in distribution main biofilm environment
- ±0.02 pH accuracy confirmed at 50µS/cm source water conductivity — 10¹²Ω input impedance buffer eliminating soft-water impedance mismatch error
RAS Water Quality Monitoring System — Zero Mortality Events, Free NH3 Speciation, Sub-8-Minute DO Alarm
Multi-parameter RAS water quality monitoring for a 500-tonne annual production Atlantic salmon farm — requiring luminescent optode DO with 14-day service intervals in biofilter effluent, free NH3 speciation firmware from TAN/pH/temperature for species-specific toxicity alarm, sub-8-minute critical DO alarm to on-call staff, and SDI-12/Modbus TCP integration with farm management systems.
Luminescent optode DO at ±0.1 mg/L with 14-day optical wiper service interval in biofilter effluent and fish tanks; differential pH and CO2 at ±0.05 pH for carbonate system management; TAN ISE with free NH3 speciation firmware at Atlantic salmon chronic toxicity threshold; turbidity for drum filter performance; automated alarm management with critical DO alarm reaching on-call staff within 8 minutes; Modbus TCP with farm management software; SDI-12 for Campbell Scientific CR1000X dataloggers; LTE-M for real-time platform delivery.
- Zero fish mortality events attributable to undetected water quality excursions over 6-month pre-commercial production cycle — compared to 3 events in preceding cycle without continuous monitoring
- Free NH3 alarm triggered 4 incidents at sub-threshold TAN — pH elevation during heavy feeding would have reached salmon toxicity limit without NH3 speciation firmware
- Sub-8-minute critical DO alarm response validated from parameter exceedance through sensor electronics, firmware, LTE-M, and on-call notification
- 14-day optode service interval in biofilter effluent — replacing Clark cell membrane service requirement of 3-5 days in RAS biofilm environment
Building water quality, flow, or leak detection electronics? Let's measure every drop.
Water chemistry characterisation as the first design input before any sensor selection — not as the last validation test after specification failures. ISO measurement method compliance engineered from 860nm LED wavelength selection through Formazin primary standard calibration procedure, not claimed from specification sheet language. Full-stack delivery from electrochemical signal conditioning and luminescent optode phase detection through acoustic correlator pipe-material parameterisation through SDI-12, Modbus, and SCADA historian integration through regulatory compliance data record generation.
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