210 nm UV absorption measures nitrate nitrogen continuously without chemical reagents
Reagent-free UV nitrate analyzer · PUVNO3-900
Online UV Spectral Nitrate Analyzer
A direct-immersion, reagent-free spectral probe for continuous nitrate nitrogen measurement in drinking water, source water, industrial process water and wastewater treatment.
0.1–100.0 mg/L±5%0.01 mg/L
Values checked item by item against the PUVNO3-900 source
Both optical-path ranges, accuracy, resolution, dimensions, weights, protection and interfaces are stored separately. The black transmitter image is the approved FUNEL export presentation; final configuration remains subject to project confirmation.
01
Measurement principle and product highlights
Direct-immersion measurement requires no sampling or pretreatment
Two optical-path options cover 0.1–100.0 mg/L and 0.1–50.0 mg/L
Automatic cleaning reduces maintenance for continuous duty
Reverse-polarity protection supports sensor power and RS485 wiring
Time display, data storage, historical records and optional wireless transmission support project integration
02
Product technical specifications
Before quotation, confirm the water matrix, minimum and maximum nitrate nitrogen, required 1 mm or 2 mm optical path, turbidity and solids, cleaning, pressure, mounting, cable, power, outputs and destination.
- Measurement principle
- 210 nm UV spectral absorption
- Range — 1 mm optical path
- 0.1–100.0 mg/L
- Range — 2 mm optical path
- 0.1–50.0 mg/L
- Accuracy
- ±5%
- Repeatability
- ±2%
- Resolution
- 0.01 mg/L
- Pressure rating
- ≤0.4 MPa
- Sensor materials
- SUS316L standard; titanium alloy for seawater; PUR cable
- Power supply
- 85–500 VAC; 9–36 VDC
- Analog output
- 3 × 4–20 mA
- Relays
- 3 configurable relays
- Digital communication
- Modbus RS485
- Storage temperature
- -15–50°C
- Operating temperature
- 0–45°C, non-freezing
- Sensor dimensions — 1 mm path
- Ø69 × 381 mm
- Sensor dimensions — 2 mm path
- Ø69 × 382 mm
- Transmitter dimensions
- 145 × 125 × 162 mm
- Sensor weight
- 3.2 kg
- Transmitter weight
- 1.35 kg
- Sensor protection
- IP68 / NEMA6P
- Transmitter protection
- IP66 / NEMA4X
- Cable
- 10 m standard; extendable to 100 m
03
Source-supported applications
Drinking water
Continuously track nitrate nitrogen in drinking-water monitoring programs.
Surface and source water
Monitor nitrate trends in rivers, lakes and source-water projects.
Industrial process water
Add reagent-free nitrate monitoring to industrial water processes.
Wastewater and aeration tanks
Observe nitrate nitrogen continuously to support nitrification-process control.
04
Items to confirm
Spectral nitrate selection requires more than the range: actual water, optical path, turbidity and solids, fouling, cleaning and installation conditions must also be confirmed.
- 01Water matrix, monitoring objective and NO₃-N control requirement
- 02Minimum, normal and maximum nitrate nitrogen
- 031 mm or 2 mm optical path plus turbidity, solids, bubbles and fouling
- 04Pressure, mounting, automatic cleaning and maintenance access
- 05Cable, power, 4–20 mA, relays and Modbus RS485
05
Project documents available on request
Based on the water matrix, range and mounting conditions, we provide a configured datasheet, optical-path and mounting confirmation, I/O schedule and project quotation with the supply scope itemized.
Get a quote- Configured datasheet→
- Optical-path and mounting confirmation→
- Cable and I/O schedule→
- Project quotation→
06
Selection questions
What measurement method does PUVNO3-900 use?+
It uses 210 nm UV spectral absorption and calculates nitrate nitrogen from the light absorbed in the probe path.
Do the 1 mm and 2 mm paths have the same range?+
No. The 1 mm path is 0.1–100.0 mg/L and the 2 mm path is 0.1–50.0 mg/L.
Are chemical reagents required?+
No. The source states direct-immersion measurement without sampling, pretreatment or chemical reagents.
Can the website image replace a technical drawing?+
No. It is for consistent public presentation. The Ø69 × 381/382 mm sensor dimensions, transmitter dimensions and mounting remain controlled by the datasheet and order confirmation.
Contact FUNEL
Tell us what you need to measure.
We will respond with a recommended configuration, supporting documentation and quotation.