Combined infrared absorption and dual-beam scattered-light photometry for continuous transparency measurement
Infrared transparency analyzer · PDS-300
Online Transparency Analyzer
A self-cleaning optical sensor for continuous water-transparency measurement. It combines infrared absorption and scattered-light photometry for black-odorous water grading and surface-water projects.
2–100 cm±0.3 cm or 5%IP68 / NEMA6P
Values checked item by item against the PDS-300 source
The 2–100 cm range, accuracy rule, pressure, velocity, dimensions, 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
Built-in self-diagnostics support measurement confidence
Optional automatic cleaning reduces optical-surface maintenance
Digital sensor output supports long-distance transmission and project integration
Plug-and-play field installation with reverse-polarity protection for sensor power and RS485 wiring
Time display, data storage, historical records and optional wireless transmission
02
Product technical specifications
Before quotation, provide the water body, monitoring objective, expected minimum and maximum transparency, suspended solids and color conditions, flow velocity, pressure, mounting, cleaning, cable, power, outputs and destination.
- Measurement principle
- Combined infrared absorption and scattered-light photometry
- Measurement range
- 2–100 cm
- Accuracy
- ±0.3 cm or 5% of reading, whichever is greater
- Pressure rating
- ≤0.4 MPa
- Maximum flow velocity
- ≤2.5 m/s (8.2 ft/s)
- 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
- Ø60 × 254 mm
- Transmitter dimensions
- 145 × 125 × 162 mm
- Sensor weight
- 1.65 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
Black-odorous water grading
Continuously track transparency as an important grading indicator for black-odorous water bodies.
Municipal rivers and lakes
Monitor transparency changes in urban inland rivers, lakes and restoration projects.
Aquaculture
Observe water-clarity trends in ponds and managed aquaculture water.
Landscape water
Add continuous transparency measurement to managed landscape-water systems.
04
Items to confirm
Online transparency selection requires more than the 2–100 cm range: actual water, solids, color, bubbles, fouling, hydraulics and installation conditions must also be confirmed.
- 01Water-body type, monitoring objective and transparency-grading requirement
- 02Minimum, normal and maximum transparency
- 03Suspended solids, color, bubbles and sensor fouling
- 04Velocity, pressure, mounting, automatic cleaning and maintenance access
- 05Cable, power, 4–20 mA, relays and Modbus RS485
05
Project documents available on request
Based on the range, water body, mounting and cleaning conditions, we provide a configured datasheet, mounting confirmation, I/O schedule and project quotation with the supply scope itemized.
Get a quote- Configured datasheet→
- Mounting and cleaning confirmation→
- Cable and I/O schedule→
- Project quotation→
06
Selection questions
How is PDS-300 different from a turbidity analyzer?+
PDS-300 reports transparency in centimeters over a documented 2–100 cm range. PTU and PLTU analyzers report turbidity in NTU; the parameters are not interchangeable.
How is accuracy determined?+
The source specifies ±0.3 cm or 5% of reading, whichever is greater.
Is a transmitter always required?+
The source notes that the digital sensor can be integrated without a transmitter, but communication, power, display and control must be confirmed for the project.
Can the website image replace a technical drawing?+
No. The clean image is for public presentation. The Ø60 × 254 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.