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Water Quality Sensors Sensor · 140+ Models
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Products · Five Product Lines

From 140+ models of self-developed sensors to complete monitoring systems — browse by category, each card links directly to the product detail page.

MicroSENSOR M200 · Water Quality Sensors Electrochemical · Optical Technology Platforms 12 Parameters · 110+ Models · IP68
M200-PH pH Sensor

pH Sensor

Composite glass electrode with built-in temperature compensation, available in digital and smart versions. Supports immersion / flow-through / in-line installation.

Range0.00~14.00 pH
Resolution0.01 pH
Accuracy±0.2 pH
View Details
M200-ORP ORP Sensor

ORP Sensor

Platinum ring electrode with ion adsorption method, direct ORP reading for assessing disinfection, reduction, and biochemical reaction status.

Range±2000 mV
Resolution0.1 mV
Accuracy±0.2 mV
View Details
M200-DO Dissolved Oxygen Sensor

Dissolved Oxygen Sensor

Dual technology of fluorescence and membrane methods, no frequent calibration needed, flow-rate interference resistant. Ideal for aquaculture and wastewater aeration.

Range0~20 mg/L
Resolution0.01 mg/L
Accuracy±2% FS
View Details
M200-CD Conductivity Sensor

Conductivity Sensor

Full constant coverage K=0.01/0.1/1.0/10, from ultrapure water to high-salinity wastewater, with PPS/ABS/stainless steel housing.

Range0~2000 μS/cm multi-range
Resolution0.1 μS/cm
Accuracy±2% FS
View Details
M200-CL Residual Chlorine Sensor

Residual Chlorine Sensor

Constant-voltage amperometric membrane method for free chlorine / total chlorine. Reagent-free, for drinking water, secondary water supply, and pool disinfection monitoring.

Range0~20 mg/L
Resolution0.01 mg/L
Accuracy±2%
View Details
M200-TUR Turbidity Sensor

Turbidity Sensor

90° scattered light method with self-cleaning brush for anti-fouling. Multi-range coverage from tap water to wastewater effluent.

Range0~4000 NTU multi-range
Resolution0.001 NTU
Accuracy±3% FS
View Details
M200-COD COD Chemical Oxygen Demand Sensor

COD Chemical Oxygen Demand Sensor

Dual-wavelength UV absorption method, reagent-free direct measurement of relative organic matter concentration, convertible to COD equivalent. Suitable for process monitoring and trend warning.

Range0~500 mg/L
Resolution0.01 mg/L
Accuracy±5%
View Details
M200-NH4 Ammonia Nitrogen Sensor

Ammonia Nitrogen Sensor

Membrane-covered ion-selective method for online direct reading. Reagent-free, multi-range suitable for wastewater plant influent/effluent and surface water.

Range0~100 mg/L multi-range
Resolution0.01 mg/L
Accuracy±5% FS
View Details
M200-SS Suspended Solids SS Sensor

Suspended Solids SS Sensor

Infrared light scattering method for SS and sludge concentration. With self-cleaning, measures up to 50000 mg/L high-concentration sludge.

Range0~1500 mg/L
Resolution0.1 mg/L
Accuracy±5%
View Details
M200-CHL Chlorophyll Sensor

Chlorophyll Sensor

Chlorophyll-a fluorescence method, real-time reflection of algae biomass, for eutrophication monitoring in lakes, reservoirs, and water sources.

Range0~500 μg/L
Resolution0.01 μg/L
Accuracy±5% FS
View Details
M200-BGA Blue-Green Algae Sensor

Blue-Green Algae Sensor

Phycocyanin fluorescence method directly provides algal cell density, for algal bloom warning and water source protection.

Range0~300000 cells/mL
Resolution1 cells/mL
Accuracy±5%
View Details
M200-OIL Oil-in-Water Sensor

Oil-in-Water Sensor

UV fluorescence method for oil-in-water measurement, ppm-level resolution, for petrochemical, port, and oily wastewater discharge monitoring.

Range0~50 ppm
Resolution0.001 ppm
Accuracy±3% FS
View Details
MicroSENSOR M200 · Ion-selective Electrode Series PVC membrane · Solid-state · Glass membrane, reagent-free online reading 12 Ions · RS116~RS127 · IP68
M200-ION-NO3 Nitrate Ion Sensor

Nitrate Ion Sensor

Ion-selective electrode (ISE) direct reading, PVC membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0.01~14000 mg/L
Accuracy±5.0% FS
Sensitive MembranePVC Membrane
View Details
M200-ION-CL Chloride Ion Sensor

Chloride Ion Sensor

Ion-selective electrode (ISE) direct reading, solid-state membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range1.8~35000 mg/L
Accuracy±5.0% FS
Sensitive MembraneSolid-state Membrane
View Details
M200-ION-F Fluoride Ion Sensor

Fluoride Ion Sensor

Ion-selective electrode (ISE) direct reading, solid-state membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0.1~1900 mg/L
Accuracy±5.0% FS
Sensitive MembraneSolid-state Membrane
View Details
M200-ION-CU Copper Ion Sensor

Copper Ion Sensor

Ion-selective electrode (ISE) direct reading, solid-state membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~6400 mg/L
Accuracy±5.0% FS
Sensitive MembraneSolid-state Membrane
View Details
M200-ION-PB Lead Ion Sensor

Lead Ion Sensor

Ion-selective electrode (ISE) direct reading, solid-state membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~20000 mg/L
Accuracy±5.0% FS
Sensitive MembraneSolid-state Membrane
View Details
M200-ION-K Potassium Ion Sensor

Potassium Ion Sensor

Ion-selective electrode (ISE) direct reading, PVC membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~39000 mg/L
Accuracy±5.0% FS
Sensitive MembranePVC Membrane
View Details
M200-ION-CA Calcium Ion Sensor

Calcium Ion Sensor

Ion-selective electrode (ISE) direct reading, PVC membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~40000 mg/L
Accuracy±5.0% FS
Sensitive MembranePVC Membrane
View Details
M200-ION-NA Sodium Ion Sensor

Sodium Ion Sensor

Ion-selective electrode (ISE) direct reading, glass membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~23000 mg/L
Accuracy±5.0% FS
Sensitive MembraneGlass Membrane
View Details
M200-ION-CN Cyanide Sensor

Cyanide Sensor

Ion-selective electrode (ISE) direct reading, solid-state membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~260 mg/L
Accuracy±5.0% FS
Sensitive MembraneSolid-state Membrane
View Details
M200-ION-BR Bromide Ion Sensor

Bromide Ion Sensor

Ion-selective electrode (ISE) direct reading, solid-state membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~50000 mg/L
Accuracy±5.0% FS
Sensitive MembraneSolid-state Membrane
View Details
M200-ION-I Iodide Ion Sensor

Iodide Ion Sensor

Ion-selective electrode (ISE) direct reading, solid-state membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~50000 mg/L
Accuracy±5.0% FS
Sensitive MembraneSolid-state Membrane
View Details
M200-ION-AGS Silver Sulfide Ion Sensor

Silver Sulfide Ion Sensor

Ion-selective electrode (ISE) direct reading, solid-state membrane, reagent-free. A/B/C three form factors for immersion / flow-through installation.

Range0~50000 mg/L
Accuracy±5.0% FS
Sensitive MembraneSolid-state Membrane
View Details
Nitrate · Chloride · Fluoride · Copper · Lead · Potassium · Calcium · Sodium · Cyanide · Bromide · Iodide · Silver Sulfide — 12 ions in total, unified ±5.0% FS accuracy, 0~3 bar pressure resistance, PC/PBT anti-corrosion housing, RS-485 / 4~20mA dual output — View ion-selective electrode series overview
Online Water Quality Monitor · MicroCONTROL Series Wall · Floor · Pole · Outdoor — Four Form Factors 8-channel Main Unit · Plug & Play
M96X Wall-mounted Multi-parameter Water Quality Monitor

Wall-mounted Multi-parameter Water Quality Monitor

Wall-mounted, small footprint. 5 preset field solutions cover routine monitoring.

Channels8-channel Analog
Display7″ Touchscreen
ProtectionIP54
View Details
301B Floor-standing Multi-parameter Water Quality Monitor

Floor-standing Multi-parameter Water Quality Monitor

Vertical integrated cabinet, floor-standing ready-to-use station, no wall mounting required.

Dimensions500×440×1500
Weight49.5 kg
ProtocolRS-485
View Details
300-M Portable Water Quality Tester

Portable Water Quality Tester

Optical detection replaces membrane electrodes, shockproof carrying case design.

Parameters14+ items
ProtectionIP68
PowerBuilt-in Battery
View Details
Automatic Water Quality Monitoring Station · Smart Stations Buoy · Miniature · Mobile Vehicle — Three Form Factors On-site Deployment · Unattended Operation
Buoy Buoy Online Water Quality Monitoring Station

Buoy Online Water Quality Monitoring Station

Buoy station for rivers, lakes and reservoirs. Solar-powered long endurance, 4G wireless transmission.

BuoyΦ700 PE
Load Capacity50 kg
Communication4G Wireless
View Details
-650 Outdoor Compact Water Quality Monitoring Station (Sensor-based Solution)

Outdoor Compact Water Quality Monitoring Station (Sensor-based Solution)

Integrated protective enclosure, expansion bolt floor installation, AC/solar dual power supply.

PowerAC / Solar
Communication4G/Modbus
ProtectionIP54
View Details
ZYS510 Miniature Automatic Water Quality Monitoring Station (National Standard Analysis Solution)

Miniature Automatic Water Quality Monitoring Station (National Standard Analysis Solution)

2 ㎡ footprint, enables rapid deployment of high-density monitoring points.

Parameters9+ items
ProtectionIP55
Power SupplyAC 220V
View Details
-600 Pole-mounted Water Quality Monitoring Station

Pole-mounted Water Quality Monitoring Station

3m pole integrated design, solar self-powered outdoor solution.

Power50W Solar
Battery32Ah
Transmission4G Wireless
View Details
Mobile Water Quality Monitoring Vehicle

Water Quality Monitoring Vehicle

Emergency monitoring, pollution source tracing, rapid response — "measure upon arrival".

ScenarioSurface / Underground / Sewage
ResponseMeasure on Arrival
PositioningGIS Integrated
View Details
Specialized Analyzers · Automatic Sampling Biotoxicity · Heavy Metals · Portable · Sampling National Standard Method · CEP Certified
DX01 Online Biotoxicity Analyzer

Online Biotoxicity Analyzer

Luminescent bacteria comprehensive toxicity method, ISO/GB dual standard compliant.

Range0–100%
Resolution1%
ProtocolModbus
View Details
ZXcm Online Heavy Metal Analyzer

Online Heavy Metal Analyzer

Total manganese/iron/lead/zinc/chromium/copper/nickel and hexavalent chromium detection.

Range0–20 mg/L
Accuracy±10%
Cycle25 min
View Details
ZYAT-610 Automatic Water Quality Sampler

Automatic Water Quality Sampler

25-bottle sample retention, time/flow/trigger multi-mode sampling.

Bottles25 Bottles
Temperature Control4±2 ℃
Distance≥ 60 m
View Details
Flow & Network Monitoring Equipment · Flow & Network Flow · Level · Manhole Cover · Network Urban Lifeline · Full Scenarios
F12 Doppler Ultrasonic Flow Meter

Doppler Ultrasonic Flow Meter

Suitable for rivers, open channels and pipelines. Intrinsically safe explosion-proof certified.

Flow Velocity0.02–6 m/s
Min Water DepthOnly 3 cm
ProtectionIP68
View Details
LD04 Radar-Ultrasonic Integrated Flow Meter

Radar-Ultrasonic Integrated Flow Meter

Dual measurement for full-pipe and non-full-pipe. Top-of-pipe installation, no need to enter the manhole.

Level0.1–10 m
Accuracy0.5% FS
PowerDC 9–15V
View Details
LD02 Radar Level Gauge

Radar Level Gauge

Non-contact FMCW radar, 20m measuring range.

Accuracy±2 mm
Beam Angle3°×3°
ProtectionIP68
View Details
QJ Smart Manhole Cover Displacement Sensor

Smart Manhole Cover Displacement Sensor

Cover opening/displacement/water immersion monitoring. NB-IoT triple network connectivity.

Battery3.6V/8000mAh
Communication4G/NB-IoT
Response20–40 seconds
View Details
CTU Drainage Network Monitoring System

Drainage Network Monitoring System

Low-power data acquisition terminal, stable operation in manhole environments.

Communication4G/NB/Cat1
Battery1200Wh
ProtectionIP68
View Details
Enterprise Strength

Enterprise Strength at a Glance

R\u0026D depth, product breadth, project experience, and long-term uptime capability form the foundation of HKI's water quality monitoring delivery.

Two Coasts, Three Regions · Four Center Collaboration

Hong Kong coordinates the technology roadmap, Taiwan handles product definition and algorithms, Zhuhai takes on smart manufacturing and QC, and the China Operations Center is responsible for nationwide delivery and O&M — forming a fully integrated R\u0026D and production closed loop.

Full Product Lineup

From digital sensors and multi-parameter monitors to buoy stations, specialized analyzers, and flow & network equipment — one-stop complete solution, no cross-vendor integration, no cross-protocol debugging required.

140+ Fully Self-developed Sensors

Three major technology platforms: electrochemical, ion-selective, and optical. 140+ models covering 25+ parameters — controlling data quality from the sensor source, rather than outsourcing and rebranding.

Plug-and-Play Architecture

Auto-sensor recognition, free combination, interchangeability, no configuration required. Unified Modbus-RTU interface, one-time deployment with lifetime expandability, significantly reduced O&M costs.

99.2% Equipment Uptime

Collaborative support for long-term operation through sensors, algorithms, complete unit structure, and remote O&M. Equipment uptime reaches 99.2%, continuously improving effective data rate and O&M efficiency.

12 Years Focused on Water Quality Monitoring

Deeply engaged in water quality online monitoring since 2012, with cumulative deployment of 300+ water projects and 10,000+ monitoring points, serving over 30 provinces and cities nationwide.

HKI Smart Multi-parameter Water Quality Analyzer Online
pH7.42
Dissolved Oxygen mg/L8.34
Turbidity NTU2.5
Temperature °C25.0
Conductivity μS/cm513
Residual Chlorine mg/L0.48
MicroCONTROL · 7″ Touchscreen · RS485 / Modbus
Live Monitoring

Real-time Readings on Screen,
Instant Alarm on Threshold Exceedance

All monitors come with a 7-inch touchscreen for local real-time reading; automatic sound-light alarm on threshold exceedance; the same data is transmitted directly to the upper platform via RS-485/Modbus, with local and cloud synchronization — completing the "acquisition → display → alarm → cloud" closed loop without third-party software.

  • Local7″ Touchscreen · Real-time readings for each channel
  • AlarmThreshold sound-light alarm · Relay/switch output
  • CloudRS-485 / Modbus · 4G direct data transmission
  • Storage≥ 30000 history records · Data preserved on power loss
Sensor Matrix

Full Parameter Detection Matrix · Filter by Platform

Three major technology platforms: electrochemical, ion-selective, and optical, covering 25+ detection parameters — all sensors share the same Modbus-RTU protocol, auto-recognized by any host, plug-and-play.

pHComposite Electrode

pH Acidity/Alkalinity

Acidity / Alkalinity
Range0.00–14.00
Resolution0.01 pH
Accuracy±0.2 pH
IP68 · Immersion / Flow-through
DOUV Fluorescence

Dissolved Oxygen

Dissolved Oxygen
Range0–20 mg/L
Resolution0.01 mg/L
Accuracy±2% FS
IP68 · 12–24 VDC
ECDiaphragm Polarography

Conductivity

Conductivity
Range0–2000 μS/cm
Resolution0.1 μS/cm
Accuracy±2% FS
IP68 · 316L Material
NTUScattered Light

Turbidity

Turbidity
Range0–4000 NTU
Resolution0.001 NTU
Accuracy±3% FS
IP68 · Multi-range Available
T°PT1000

Water Temperature

Temperature
Range0–40 ℃
Resolution0.1 ℃
Accuracy±0.4 ℃
Integrated in all other sensors
ClMembrane Method

Residual Chlorine

Residual Chlorine
Range0–20 mg/L
Resolution0.01 mg/L
Accuracy±2%
Drinking Water · Pool Applications
ORPIon Adsorption

Redox Potential (ORP)

Redox Potential
Range±2000 mV
Resolution0.1 mV
Accuracy±0.2 mV
IP68 · Pool / Disinfection Process
CODUV254 Dual Wavelength

Organic Matter (COD Equiv.)

Organic Matter (COD Equiv.)
Range0–500 mg/L
Resolution0.01 mg/L
Accuracy±5%
316L · Reagent-free, Maintenance-free
NH3Ion-selective Method

Ammonia Nitrogen

Ammonia Nitrogen
Range0–100 mg/L
Resolution0.01 mg/L
Accuracy±5% FS
Membrane-covered Ion-selective · Reagent-free
ChlFluorescence Method

Chlorophyll-a

Chlorophyll
Range0–500 μg/L
Resolution0.01 μg/L
Accuracy±5% FS
Key indicator for eutrophication warning
BGAFluorescence Method

Blue-Green Algae

Blue-Green Algae
Range0–300k cells/mL
Resolution1 cell/mL
Accuracy±5%
Algal bloom monitoring · Lake & reservoir scenarios
TSSInfrared Scattering

Suspended Solids

Suspended Solids
Range0–1500 mg/L
Resolution0.1 mg/L
Accuracy±5%
Wastewater treatment process monitoring
NO3Solid-state Membrane Method

Nitrate Nitrogen

Nitrate
Range0–1000 ppm
Resolution0.001 ppm
Accuracy±5% FS
One of 12 ions · Reagent-free
Ca2+Solid-state Membrane Method

Calcium Ion

Calcium Ion
Range0–40000 ppm
Resolution0.001 ppm
Accuracy±5% FS
Circulating water · Hardness control
OIWUV Fluorescence

Oil-in-Water

Oil-in-Water
Range0–50 ppm
Resolution0.001 ppm
Accuracy±3% FS
With self-cleaning brush · 10m immersion
Applications

Six Industry Scenarios · Scenario-based Selection

The value of water quality monitoring depends on scenario understanding. We have developed complete selection solutions and key indicator combinations for each type of water body.

Drinking Water & Secondary Supply Application Scenario SCENE
Drinking Water & Secondary Supply pH · Conductivity · Residual Chlorine · Turbidity · Temperature
Lake Water Application Scenario SCENE
Surface Water · Rivers, Lakes & Reservoirs Buoy Station + Mini Station + Multi-parameter Online
Aquaculture Application Scenario SCENE
Aquaculture DO · Ammonia Nitrogen · Nitrite linked aeration
Black & Odorous Water Remediation Application Scenario SCENE
Black & Odorous Water Remediation Transparency · Ammonia Nitrogen · DO · CODuv (process monitoring) · TP
Industrial & Wastewater Treatment Application Scenario SCENE
Industrial & Wastewater Treatment COD/Ammonia Nitrogen/TP/TN + Heavy Metals
Swimming Pool Application Scenario
Swimming Pool & Public Health pH · ORP · Residual Chlorine · Turbidity
HKI · ABOUT US

About HKI

HKI (full company name: HKI (Zhuhai) Co., Ltd.) is focused on water quality sensing hardware and water digitalization systems. From core sensors to complete systems, from field monitoring to cloud platforms — making water data clear with self-developed technology.

Two Coasts, Three Regions · Integrated R&D & Production

Leveraging Hong Kong headquarters, Taiwan R&D center, Zhuhai smart manufacturing center, and China operations center, forming a R&D — Design — Manufacturing — Delivery — O&M full-chain business closed loop.

12 Years of Focus · Strict Quality Control

All products follow European industrial quality control standards, undergoing 72-hour high/low temperature, simulated wastewater, and communication stability triple verification before delivery, ensuring long-term operation in complex water environments.

Full-stack Self-developed · Autonomous & Controllable

Core measurement solutions, sensor algorithms, complete unit structure, embedded systems, and digital platforms are continuously developed and maintained by in-house teams, with 10+ Software Copyrights.