What Is a Sewage Water Quality Monitoring Well?
A sewage water quality monitoring well — also called a drainage network monitoring point — is an instrumented manhole or inspection chamber within a municipal or industrial drainage network where water quality is measured continuously in real time.
Unlike surface water or tap water monitoring, sewer monitoring presents unique challenges:
•Confined, explosive-atmosphere spaces requiring intrinsically safe or explosion-proof equipment
•Highly variable water quality — flow surges, mixed industrial and domestic discharge, FOG (fats, oils, grease)
•No mains power at most manhole locations
•Difficult access — monitoring must be long-term and unattended
•High sediment and fouling loads that rapidly foul unprotected sensors
The KNF-400D is designed specifically to address all of these constraints — delivering reliable, continuous water quality data from inside drainage network manholes with minimal civil works and maintenance.
Introducing the KNF-400D — Drainage Network Water Quality Monitoring System
The KNF-400D sewage well drainage monitoring system combines online digital sensors, a wireless acquisition terminal, and the Kainafu cloud platform into a compact, low-power unit that installs directly onto the manhole wall — no road breaking, no construction, no external housing required.
What It Monitors
| Parameter |
Method |
Range |
Accuracy |
| pH |
Glass electrode |
0–14 pH |
±0.05 pH |
| COD |
UV spectrometry |
0.5–500 mg/L |
±5% F.S. |
| Ammonia Nitrogen |
Ion selection |
0–1,000 mg/L |
±5% F.S. |
| Oil in Water |
UV fluorescence |
0–100 ppm |
±5% |
| Liquid Level / Flow |
Radar / Ultrasonic |
0–10 m |
2% |
| Conductivity |
4-electrode |
0–100 mS/cm |
1% |
| Turbidity |
90° scattered light |
0–400 NTU |
≤±0.1 NTU |
Sensor combination is configurable — users select the parameters relevant to their monitoring requirements.
Key Features of the KNF-400D
15-Minute Installation — No Road Breaking
The KNF-400D mounts directly onto the interior wall of the manhole using the included bracket system. No excavation, no pipe tapping, no civil works. A complete installation from unboxing to live data takes approximately 15 minutes — making large-scale network deployment fast and cost-effective.
Flexible Power Supply
Built-in battery: Lithium polymer, 48,000 mAh — supports long-term autonomous operation between site visits
External power: DC 12V for locations with available mains supply
Low-power electronics design maximizes battery runtime in unattended deployments
Explosion-Proof Certified
Sewage manholes are classified as potentially explosive atmospheres due to the presence of methane (CH₄) and hydrogen sulfide (H₂S). The KNF-400D's main engine carries an explosion-proof certification — safe for deployment in Zone 1 and Zone 2 hazardous areas without additional equipment or housings.
4G Wireless + Cloud Platform
All monitoring data is transmitted wirelessly via 4G to the Kainafu Water Quality Monitoring Cloud Platform. No need to run data cables to the surface. Access real-time readings, historical trends, threshold alarms, and compliance reports from any browser, mobile APP, or WeChat — at any time, from anywhere.
Optional Automatic Cleaning Device
In high-fouling drainage environments, an optional automatic sensor cleaning device is available — significantly extending the interval between manual maintenance visits and maintaining measurement accuracy in heavily contaminated sewage flows.
Compact Sensor Cylinder
The sensor assembly is housed in a metal cylinder (diameter 14.5 cm, height 25.5 cm) — compact enough to fit inside standard inspection chambers while protecting sensors from direct impact by floating debris.
Application Scenarios
•Municipal sewer network discharge points — monitoring pollutant loads at key nodes to identify illegal industrial discharge into municipal drains
•Industrial park drainage outfalls — verifying that tenant businesses comply with sewer use agreements before discharge reaches the public network
•Underground and combined sewer monitoring — tracking COD, ammonia nitrogen, and flow in combined stormwater/sewage systems during wet weather events
•Garbage and waste transfer station drainage — monitoring leachate quality at waste handling facilities
•River chief / catchment management systems — distributed manhole monitoring networks supporting city-wide pollution source tracing
•Industrial compliance monitoring — fixed-source discharge surveillance for regulatory reporting
Data Management — Kainafu Cloud Platform
| Function |
Detail |
| Data upload |
Configurable interval via 4G |
| Real-time display |
Web browser + iOS/Android APP + WeChat |
| Alarm notifications |
Threshold-based push alerts |
| Data export |
Cloud storage + downloadable data tables |
| Remote configuration |
Parameter settings adjustable via cloud |
| Certifications |
ISO 9001, ISO 14001, CMA test reports, software copyright |
System Specifications
| Specification |
Value |
| Power supply |
Built-in 48,000 mAh battery or DC 12V external |
| Data output |
RS-485, 4G wireless, NB-IoT |
| Sensor cylinder |
Metal housing Φ14.5 cm × H25.5 cm |
| Maintenance cycle |
~6 months (optional auto-cleaning extends interval) |
| Explosion-proof |
Certified for hazardous atmosphere |
| Certifications |
ISO 9001, ISO 14001, CMA, software copyright |
Why the KNF-400D Is the Practical Choice for Sewer Monitoring
Most water quality monitoring equipment is designed for surface or pipeline installation — not for the confined, explosive, and highly corrosive environment inside a drainage manhole. The KNF-400D is one of the few systems on the market purpose-engineered for manhole deployment from the ground up:
•Wall-mount design eliminates the need for surface housing or external cabinets
•Explosion-proof certification covers the real hazards of the sewer environment
•Large-capacity battery removes the dependency on mains power at each monitoring point
•Configurable sensor combinations avoid paying for parameters irrelevant to each site
•Direct cloud connectivity removes the need for local data loggers or communication equipment
For municipal drainage departments, environmental protection agencies, and industrial park operators needing cost-effective, scalable sewer network monitoring, the KNF-400D delivers the complete solution — straight into the manhole.
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