Nutrient SensorsTL-NO Series
Nitrate / Nitrite Sensor
Nutrient Sensors
Nitrate / Nitrite Sensor
TL-NO Series
UV absorption nitrate/nitrite sensor. Reagent-free, range 0–100 mg/L NO₃, IP68.
Request a QuoteProduct Overview
The TL-NO Series uses UV absorption spectroscopy to measure nitrate and nitrite concentrations without reagents. Reagent-free operation reduces maintenance costs and eliminates chemical waste.
Working Principle
The sensor uses a continuous online measurement principle with automatic temperature compensation. The measurement signal is processed by an integrated microprocessor and transmitted via RS485 Modbus RTU for direct integration with PLCs, data loggers, and SCADA systems. The 4–20 mA analog output provides compatibility with legacy control systems.
Wiring & Signal Output
Power supply: 12–24 V DC (standard); 220 V AC with adapter
Primary output: RS485 Modbus RTU (address configurable 1–247)
Analog output: 4–20 mA (proportional to measured value)
Relay output: 2 × SPDT relay for alarm / dosing control
Communication: Modbus RTU function codes 03 / 06 / 16
Cable entry: M16 cable gland, IP68 submersible cable available
Technical Specifications
| Parameter | Value |
|---|---|
| Measurement Principle | UV absorption spectroscopy |
| Nitrate Range | 0–100 mg/L |
| Nitrite Range | 0–50 mg/L |
| Accuracy | ±5% FS |
| Temperature Range | 0–45°C |
| Pressure | 0–2 Bar |
| Signal Output | RS485 Modbus RTU + 4-20mA |
| Power Supply | 12–24 VDC |
| Protection | IP68 |
| Material | SS316L |
Key Features
- Reagent-free UV absorption measurement
- No chemical waste or reagent costs
- Simultaneous nitrate and nitrite measurement
- Suitable for continuous immersion
Typical Applications
Wastewater treatmentRiver/lake monitoringAgricultural runoff monitoringDrinking water compliance
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