Online Water Quality Analyzer
Product Overview
The Industrial Online Water Quality Analyzer provides continuous 24/7 measurement of physical and chemical parameters in municipal water treatment, wastewater compliance streams, and industrial process loops. The unit processes raw inputs from electrochemical and optical sensors, translating them into stable 4-20mA current loops and digital Modbus RTU (RS485) outputs for direct SCADA or PLC integration. Galvanically isolated power supplies and internal surge suppression prevent ground-loop errors and electromagnetic interference in high-voltage industrial control panels.
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Measurement & Testing Principles
pH / ORP
Differential measurement utilizing a dual high-impedance glass electrode and a salt bridge reference junction, minimizing reference poisoning and potential drift in waste streams.
Dissolved Oxygen (DO)
Optical luminescence quenching (phase-shift technology). Blue excitation light interacts with a ruthenium-doped luminophore film; returning red phase shift calculates oxygen partial pressure without electrolyte replacement or flow dependence.
Conductivity / TDS
Four-electrode bipolar and toroidal cells operating at high-frequency AC to eliminate electrode polarization and salt-scaling build-up in high-salinity brine loops.
Turbidity
Nephelometric infrared measurement operating at an 860 nm wavelength to reject ambient sample color interference.
Product Configurations
PWA-100 (Single-Loop Transmitter)
Dedicated wall/panel controller paired with one sensor input for localized monitoring tasks.
PWA-400 (Multi-Parameter Controller)
Centralized terminal supporting up to 4 simultaneous digital sensor buses (pH, Conductivity, DO, Turbidity), reducing cabinet footprint and wiring overhead.
Immersion Assembly (Type-I)
SS316L or UPVC extension rods with quick-release mounting brackets for open channels and aeration basins.
Flow-Through Assembly (Type-F)
Bypass manifold machined from solid UPVC blocks, incorporating integrated needle valves, bubble traps, and sample pressure regulators (max 0.6 MPa).
Key Technical Features
Digital Bus Architecture
Sensors store calibration curves internally; hot-swapping probes in the field requires zero zero/span recalibration at the main controller.
Field-Configurable Relays
Three independent Form C (SPDT) electromechanical relays assignable to high/low process limits, fault alarms, or automatic wash cycles.
Ingress Protection
Die-cast aluminum and heavy-duty polycarbonate enclosures rated to IP65 (wall mount) and IP67 (submerged sensors).
Data Archiving
Non-volatile internal flash memory logs up to 500,000 historical data timestamps, accessible via local USB port or remote polling.
Technical Specifications
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Specification Parameter |
Technical Data & Description |
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Display Unit |
3.5-inch industrial graphic TFT LCD with LED backlighting |
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Power Input |
85 to 265 VAC (50/60Hz) standard; 24 VDC (+/- 10%) optional |
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Analog Output |
Dual isolated 0/4 to 20 mA current loops, maximum load 500 ohms |
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Digital Output |
RS485 physical layer running Modbus RTU protocol (baud rates up to 19200 bps) |
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Relay Ratings |
SPDT (Form C), resistive load max 3A at 250 VAC / 30 VDC |
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Operating Ambient Temperature |
Controller: -20C to +60C; Sensors: 0C to +50C (pH variants up to 80C) |
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Ingress Protection (IP Rating) |
IP65 for wall-mount controller enclosure; IP67 for submerged sensors |
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Data Storage / Logging |
Non-volatile internal flash memory up to 500,000 historical timestamps |
Typical Applications
Municipal Wastewater
Aeration basin dissolved oxygen regulation and final discharge compliance logging.
Drinking Water Treatment
Raw water turbidity screening and disinfection monitoring.
Industrial Process Loops
Cooling tower blowdown control, boiler feedwater conductivity monitoring, and Reverse Osmosis (RO) membrane protection.
Chemical Processing
Effluent neutralization tank pH control prior to municipal sewer tie-in.
Installation & Operating Guidelines
Hydraulic Limits
Keep bypass sample line pressure below 0.6 MPa and maintain sample flow rates between 1.0 and 3.0 L/min via the flow meter. Install a 100 micrometer strainer upstream to protect optical windows from suspended grit.
Electrical Separation
Route low-voltage sensor cables through dedicated grounded metal conduits, separated from high-voltage motor power wiring to eliminate electromagnetic induction (EMI).
Maintenance Schedules
Replace optical DO caps every 12 to 24 months. Clean glass pH bulbs using dilute hydrochloric acid when protein or mineral scaling causes response sluggishness, followed by standard two-point buffer verification.
Manufacturing & Quality Control
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Material Certification
Wetted metallic components are manufactured from certified SS316L; plastic bodies utilize chemical-resistant, UV-stabilized ABS/PC or PVDF, backed by mill test reports.
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Machining Tolerances
Sensor housings and flow manifolds are cut on 5-axis CNC machining centers, holding dimensional tolerances within +/- 0.02 mm.
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Burn-In & Testing
Every transmitter passes a 72-hour operational burn-in test at +50C under power. Analog outputs are verified against traceable process calibrators.
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Regulatory Compliance
Built under strict internal quality management systems and standard electrical safety guidelines.
Customization & OEM Services
Private Labeling
Custom laser-etched nameplates, tailored startup boot screens, and branded operator interface overlays for system integrators.
Skid Integration
Pre-wired, pre-piped multi-parameter analyzer panels mounted on structural back-planes, ready for direct field plumbing.
Communication Adjustments
Tailored Modbus register maps or specialized ASCII string structures to match proprietary PLC host systems.
FAQ
Dalian Yheng Technology Co., Ltd. is one of the leading online water quality analyzer manufacturers and suppliers in China, also supports customized service. We warmly welcome you to buy high quality online water quality analyzer in stock here from our factory. Contact us for more details.
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