Water/Wastewater Sensors
Monitor water quality in real-time with our comprehensive range of online sensors and multi-parameter probes. From drinking water treatment to wastewater discharge monitoring, our intelligent sensor systems deliver accurate, continuous measurements with minimal maintenance. Achieve regulatory compliance, optimize treatment processes, and respond rapidly to water quality changes with automated monitoring technology.
Dissolved Oxygen (DO) Sensors
Optical DO Sensors
Maintenance-free luminescent technology for reliable oxygen monitoring:
- Measurement Range - 0-20 mg/L (0-200% saturation) | Ultra-low range option: 0-2 mg/L for anaerobic process monitoring
- Accuracy - ±0.1 mg/L or ±2% of reading, whichever is greater | Drift <1% per month
- Technology Advantages - No membrane replacement | No electrolyte refilling | Zero oxygen consumption | Unaffected by H₂S or flow rate
- Response Time - T90 <60 seconds | T95 <90 seconds | Fast detection of process upsets
- Temperature Compensation - Automatic 0-50°C | Pressure compensation for depth installations
- Calibration - Single-point air calibration | Stable for 6-12 months between calibrations
- Applications - Aeration basin optimization, effluent discharge monitoring, drinking water treatment, aquaculture, river/stream monitoring, bioreactor control
Polarographic DO Sensors
Proven electrochemical technology for demanding applications:
- Measurement Range - 0-20 mg/L | Extended range to 50 mg/L for oxygenation systems
- Accuracy - ±0.2 mg/L | Fast response suitable for process control loops
- Membrane Options - Standard PTFE for clean water | Heavy-duty for high-solids wastewater
- Maintenance - Membrane replacement every 2-4 months | Electrolyte refill every 6 months
- Cost-Effective - Lower initial cost than optical | Proven reliability in municipal WWTPs
- Applications - Wastewater aeration control, industrial effluent, lagoon monitoring, secondary treatment optimization
Turbidity Sensors
Low-Range Turbidity (Drinking Water)
Precision nephelometric sensors for potable water compliance:
- Measurement Range - 0-10 NTU | 0-100 NTU | 0-1000 NTU models available
- Accuracy - ±2% of reading or 0.02 NTU (whichever is greater) for 0-10 NTU range
- Technology - 90° nephelometric scatter (ISO 7027 compliant) | 860 nm infrared LED eliminates color interference
- Self-Cleaning - Ultrasonic cleaning or mechanical wiper options | Reduces fouling in source water
- Regulatory Compliance - Meets EPA Method 180.1 requirements | Approved for continuous turbidity monitoring in filter effluent
- Alarm Functions - Configurable setpoints for filter breakthrough detection | Data logging for compliance reporting
- Applications - Drinking water plant effluent monitoring, filter performance assessment, distribution system surveillance, regulatory compliance (0.3 NTU limit)
High-Range Turbidity (Wastewater & Process)
Robust sensors for high-solids applications:
- Measurement Range - 0-4000 NTU | Extended range 0-10,000 NTU for sludge blankets
- Technology - Backscatter or combination scatter/transmission for turbid samples
- Rugged Construction - Heavy-duty sapphire windows | Titanium housing for corrosive environments
- Self-Cleaning - High-pressure air purge or brush wipers | Compressed air-driven ball cleaning system
- Applications - Wastewater influent/effluent, clarifier sludge blanket monitoring, industrial process control, stormwater runoff, river sediment transport studies
Conductivity Sensors
Contacting Conductivity Sensors
Traditional electrode technology for general water quality monitoring:
- Measurement Range - 0-200 µS/cm (ultrapure water) | 0-2,000 µS/cm (drinking water) | 0-200,000 µS/cm (wastewater/brine)
- Cell Constants - K=0.01 (ultrapure) | K=0.1 (low conductivity) | K=1.0 (standard) | K=10 (high conductivity/wastewater)
- Accuracy - ±0.5% of reading | ±1% for high-range applications
- Temperature Compensation - Automatic with integrated RTD or thermistor | Linear or non-linear compensation selectable
- TDS Calculation - Automatic conversion to mg/L TDS (user-adjustable factor)
- Applications - Drinking water quality monitoring, desalination plant control, wastewater salinity, cooling tower blowdown, reverse osmosis permeate quality
Toroidal (Inductive) Conductivity Sensors
Non-contact measurement for high-conductivity and fouling applications:
- Measurement Range - 100 µS/cm to 2,000 mS/cm | Ideal for wastewater and industrial process streams
- Fouling Resistance - No exposed electrodes to foul | Suitable for high-solids wastewater
- Low Maintenance - Virtually drift-free | No calibration required for months
- Chemical Resistance - PVDF or PEEK construction for aggressive chemicals
- Applications - Municipal wastewater, chemical processing, pulp & paper effluent, mining water, heavy brine monitoring
pH Sensors
Glass Electrode pH Sensors
High-accuracy pH measurement for diverse water matrices:
- Measurement Range - pH 0-14 | Resolution 0.01 pH units
- Accuracy - ±0.05 pH units (laboratory-grade) | ±0.1 pH units (industrial-grade)
- Reference Junction - Double junction for contaminated samples | Gel-filled for low-maintenance | Flowing junction for high-solids wastewater
- Response Time - T95 <30 seconds | Fast enough for process control applications
- Temperature Sensor - Integrated PT1000 or NTC thermistor for automatic temperature compensation
- Glass Membrane Types - General purpose (pH 2-12) | Low-sodium glass (pH 0-14) | High-temperature glass (up to 130°C)
- Calibration - 1, 2, or 3-point calibration | Buffer recognition | Calibration reminder alerts
- Applications - Drinking water pH compliance (6.5-8.5), wastewater neutralization control, chemical dosing verification, coagulation optimization, corrosion control
Differential pH Sensors
Extended lifespan for challenging wastewater applications:
- Dual Reference Design - Two reference half-cells eliminate drift | Self-diagnostic capability
- Extended Life - 18-24 months typical sensor life in wastewater | Reduced maintenance costs
- Self-Cleaning Options - Ultrasonic or chemical cleaning systems available
- Applications - Municipal wastewater treatment, industrial effluent, high-solids process streams
Ammonia (NH₃-N / NH₄⁺) Sensors
Ion-Selective Electrode (ISE) Ammonia Sensors
Direct measurement of ammonia nitrogen in water and wastewater:
- Measurement Range - 0.02-1000 mg/L NH₃-N | Auto-ranging for varying concentrations
- Detection Principle - Gas-permeable membrane separates sample from internal electrolyte | Measures dissolved ammonia (NH₃)
- Accuracy - ±5% of reading or ±0.05 mg/L, whichever is greater
- pH Dependency - Most sensitive at pH >11 (measures NH₃) | ISA buffer addition for pH adjustment in some models
- Response Time - T90: 2-5 minutes | Slower than other parameters but suitable for trend monitoring
- Interferences - Minimal interference from other ions | Volatile amines can cause positive bias
- Maintenance - Membrane replacement every 4-8 weeks | Internal electrolyte refill quarterly
- Applications - Wastewater nitrification monitoring, effluent compliance (permit limits), drinking water treatment (chloramine systems), aquaculture water quality, anaerobic digester supernatant
Optical Ammonia Sensors
Reagent-based colorimetric measurement for low-maintenance operation:
- Measurement Range - 0.02-100 mg/L NH₄⁺-N (ammonium) or NH₃-N (ammonia)
- Technology - LED photometry with reagent chemistry (Nessler or indophenol methods) | Automated reagent dosing
- Accuracy - ±3% of reading or ±0.1 mg/L
- Minimal Drift - Optical measurement with fresh reagent eliminates electrode drift issues
- Consumables - Reagent cartridges last 1-3 months depending on measurement frequency
- Applications - Drinking water distribution system monitoring, secondary effluent, process optimization in BNR plants
Hydrogen Sulfide (H₂S) Sensors
Electrochemical H₂S Sensors
Sensitive detection of hydrogen sulfide in wastewater and collection systems:
- Measurement Range - 0-10 ppm (dissolved H₂S in water) | 0-100 ppm (headspace gas monitoring)
- Detection Limit - <0.01 ppm | Critical for odor control and corrosion prevention
- Technology - Amperometric electrochemical cell | Selective to H₂S with minimal SO₂ interference
- Response Time - T90 <60 seconds | Real-time alarm for dangerous H₂S levels
- Temperature Range - -20°C to 50°C | Suitable for outdoor installations
- Sensor Life - 12-24 months typical | Replacement sensors readily available
- Calibration - Factory-calibrated | Field verification with certified gas standards
- Applications - Wastewater collection system headspace monitoring, pump station odor control, anaerobic treatment processes, septicity prevention, worker safety (confined space entry), corrosion monitoring in force mains
Dissolved Sulfide (S²⁻) Sensors
Ion-selective electrode for total dissolved sulfide measurement:
- Measurement Range - 0.01-1000 mg/L S²⁻ | Measures all dissolved sulfide species (H₂S, HS⁻, S²⁻)
- Technology - Solid-state ion-selective electrode | Silver sulfide membrane
- pH Compensation - Calculate H₂S concentration from total sulfide using pH measurement
- Applications - Wastewater treatment process control, industrial effluent monitoring, geothermal water, sulfide oxidation studies
Multi-Parameter Probes
Integrated Multi-Sensor Platforms
Measure up to 15 parameters with single probe installation. Modular design allows custom sensor combinations. Shared electronics and power supply reduce costs. Single cable connection simplifies installation. Central data logger and transmitter included.
Smart Sensor Technology
Digital sensors with onboard memory store calibration data. Plug-and-play sensor replacement without reprogramming. Auto-recognition of sensor type and range. Remote configuration via web interface or mobile app. Predictive diagnostics alert before sensor failure.
Standard Parameter Packages
Drinking Water Package: pH, turbidity, conductivity, DO, temperature, chlorine residual
Wastewater Package: pH, DO, conductivity, turbidity, ammonia, temperature
Environmental Monitoring: pH, DO, conductivity, turbidity, temperature, depth, chlorophyll, blue-green algae
Deployment Options
Submersible probes for in-situ monitoring (IP68 rated). Flow-through cells for process installations. Retractable assemblies for maintenance without process shutdown. Portable configurations for field surveying. Buoy-mounted systems for lake/reservoir monitoring.
Data Management & Communication
Real-Time Data Transmission
Multiple communication protocols for seamless integration:
- Wired Options - 4-20mA analog output (industry standard) | RS-485 Modbus RTU | Profibus DP | Ethernet TCP/IP
- Wireless Options - Wi-Fi for local networks | Cellular (4G/LTE) for remote sites | LoRaWAN for wide-area coverage | Satellite uplink for isolated locations
- SCADA Integration - Direct connection to plant SCADA systems | OPC-UA server capability | Allen-Bradley, Siemens PLC compatibility
- Cloud Data Platforms - Automatic upload to secure cloud storage | Web-based dashboards accessible from any device | Mobile app notifications | Historical trending and statistical analysis
Alarming & Notifications
Configurable alerts keep operators informed of critical changes:
- Multi-Level Alarms - Low/high warnings and critical setpoints | Hysteresis prevents alarm chattering
- Notification Methods - SMS text messages | Email alerts | Phone calls (autodial systems) | Relay outputs for sirens/beacons
- Maintenance Alerts - Calibration due reminders | Sensor cleaning required | Out-of-range diagnostics
Installation & Deployment
Process Installation Kits
Flow-through cells with adjustable flow rates (0.1-5 L/min). Automatic backwash systems prevent clogging. Sample conditioning (filtration, degassing) options. Heated enclosures for outdoor installations. Submersible pump or plant flow integration.
In-Situ Mounting
Direct immersion in tanks, basins, or channels. Adjustable mounting brackets for variable water levels. Stainless steel or PVC mounting hardware. Anti-theft security cables included. Quick-disconnect couplings for removal.
Portable & Survey Systems
Handheld multi-parameter meters with GPS logging. Ruggedized carrying cases for field deployment. Rechargeable battery packs (8+ hours operation). Bluetooth data transfer to tablets/smartphones. Ideal for compliance monitoring and site surveys.
Autonomous Monitoring Stations
Solar-powered remote installations. Weatherproof enclosures (NEMA 4X rated). Integrated datalogger and cellular modem. Battery backup for 7-14 days of operation. Ideal for watersheds, rivers, and coastal monitoring.
Why Choose Our Online Sensors?
Proven Accuracy
Factory-calibrated to NIST-traceable standards. Third-party verification testing available. Long-term stability reduces calibration frequency. Meet regulatory requirements for continuous monitoring.
Low Maintenance Design
Self-cleaning systems extend service intervals. Modular sensors enable quick replacement. Minimal reagent consumption (optical sensors). Predictive diagnostics prevent unexpected failures. Typical service intervals: 1-3 months.
Cost-Effective Operation
Reduce manual sampling and laboratory testing costs. Early detection prevents process upsets and violations. Optimize chemical dosing based on real-time data. Energy savings through DO-controlled aeration. ROI typically achieved within 6-12 months.
Regulatory Compliance
EPA-approved methods for continuous monitoring. Data logging meets chain-of-custody requirements. Tamper-evident audit trails for regulatory reporting. Validated for NPDES permit compliance. ISO 17025 accredited calibration services available.
Scalable Systems
Start with single-parameter monitoring and expand as needed. Networked sensors share infrastructure and power. Upgrade firmware for new features and capabilities. Compatible with legacy systems through protocol converters.
Expert Technical Support
Application engineers assist with sensor selection. On-site commissioning and operator training. 24/7 technical support hotline. Remote diagnostics and troubleshooting. Loaner equipment during repairs. Regional service centers across CPTPP nations.
Application Examples
| Application | Recommended Sensors | Key Benefits |
|---|---|---|
| Drinking Water Treatment Plant Effluent | pH, Turbidity (0-10 NTU), Conductivity, Chlorine Residual | Ensure compliance with 0.3 NTU limit; verify disinfection; early filter breakthrough detection |
| Wastewater Aeration Basin | DO (optical), pH, Conductivity, Ammonia (ISE) | Optimize aeration to 1.5-3 mg/L DO; reduce energy costs 20-40%; monitor nitrification |
| Secondary Clarifier Effluent | Turbidity (0-100 NTU), DO, pH, Ammonia | NPDES permit compliance; TSS correlation; alarm for upset conditions |
| Collection System Pump Station | H₂S (gas), Level, pH | Prevent odor complaints; worker safety; chemical dosing control for septicity |
| River/Stream Monitoring | Multi-parameter probe (pH, DO, Conductivity, Turbidity, Temperature) | Watershed surveillance; pollution source tracking; regulatory reporting |
| Industrial Effluent Discharge | pH, Conductivity (toroidal), Temperature, Flow meter | Pretreatment compliance; automatic diversion on violations; mass loading calculation |
Need Help Choosing?
Our applications scientists have decades of combined experience in environmental water analysis. Contact us with your specific requirements, and we'll recommend the optimal cartridge configuration. Free consultation included with every custom order inquiry.