This online spectrometric nitrate sensor adopts dual-wavelength UV spectral absorption technology (235nm measuring wavelength + 275nm reference wavelength) based on Beer-Lambert law. It detects characteristic UV absorption of nitrate ions to calculate NO₃-N concentration, automatically deducting organic matter interference via dual-wavelength algorithm without chemical reagents.
Built-in temperature compensation to eliminate temperature drift. Digital integrated circuit with standard RS485 Modbus-RTU output, compatible with nitrate monitor, PLC, DCS and cloud IoT platform. IP68 fully submersible probe, 3/4" NPT thread for pipeline, bypass and tank immersion installation. Optional automatic mechanical wiper to prevent optical window scaling and algae adhesion, stable 24/7 continuous monitoring.
Multiple optical path options (1mm/2mm/5mm) to match low-concentration clean water and high-concentration sewage scenarios. No electrode membrane consumption, far longer service life than ISE nitrate sensors.
MTW-PUVNO3-900 Online Spectrometric Nitrate Sensor adopts ultraviolet full-spectrum absorption principle to realize continuous online detection of nitrate ions without chemical reagents. Different from traditional ion-selective electrodes, the spectral measurement method avoids ion interference, features long service life and low maintenance frequency.
Built-in multi-point Pt1000 temperature compensation algorithm eliminates absorbance deviation caused by water temperature changes. Equipped with optional automatic air/water cleaning wiper to prevent optical window fouling. Standard RS485 MODBUS-RTU digital output supports long-distance data transmission, perfectly matched with water quality analyzers, PLC, DCS and industrial cloud monitoring platforms.
Key Advantages
- Reagent-free optical measurement: No chemical dosing, zero reagent consumption, low operation cost
- Dual-wavelength anti-interference: Effectively offset humus, organic UV absorption interference, higher accuracy than ISE electrodes
- No consumable membrane: No regular electrode replacement, long service life, reduce maintenance frequency
- Fast response: Real-time data output, ideal for denitrification process automatic control
- Digital RS485 Modbus: Strong anti-interference, easy access to industrial automation systems
- Optional auto-clean wiper: Suitable for sewage with high suspended solids, reduce manual cleaning work
Sensor Specifications
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Measurement Range |
0.1–40.0 mg/L (2 mm optical path) |
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Accuracy |
±5% |
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Repeatability |
±2% |
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Resolution |
0.01 mg/L |
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Pressure Range |
≤0.4 MPa |
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Sensor Material |
Body: SUS316L (standard), titanium alloy (seawater version); Cable: PUR |
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Communication Protocol |
MODBUS RS485 |
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Storage Temperature |
-15 to 50°C |
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Operating Temperature |
0 to 45°C (non-freezing) |
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Dimensions |
Diameter 69 mm × Length 365 mm |
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Weight |
3.2 kg |
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Protection Rating |
IP68/NEMA6P |
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Cable Length |
Standard 10 m, extendable up to 100 m |
Controller Specifications
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Display Output |
128×64 graphic LCD with LED backlight for sunlight-readable operation |
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Power Supply |
AC: 85–500 VAC; DC: 9–36 VDC |
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Main Materials |
PA66+GF25+FR (upper cover); powder-coated aluminum alloy (lower shell) |
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Output |
Three 4–20 mA channels |
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Relays |
Three relays with programmable response parameters and values |
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Digital Communication |
MODBUS RS485 for real-time data transmission |
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Storage Temperature |
-20 to 70°C |
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Operating Temperature |
-15 to 60°C |
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Protection Rating |
IP66/NEMA4X |
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Dimensions |
145 mm × 125 mm × 162 mm (L × W × H) |
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Weight |
1.35 kg |
Application
Drinking water plant, groundwater monitoring, surface water environmental monitoring, municipal sewage denitrification tank, agricultural irrigation water, aquaculture, industrial nitrate-containing process water, landfill leachate monitoring
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