Combined infrared absorption and dual-beam scattered-light method; the supplied sheet references ISO 7027 infrared measurement
Immersion online analyzer · PTU-800
Wide-Range Online Turbidity Analyzer
The widest documented range in this five-model group, with dual-beam infrared scattering, a larger Ø60 mm sensor and optional standard or seawater construction.
0.01–100 / 0.01–4000 NTU±2% or ±0.1 NTU≤0.4 MPa
Model-specific values checked against the supplied sheet
Range, accuracy, pressure or sample flow, interfaces, dimensions and protection are not copied between the five models. Final mounting and project configuration are controlled by the confirmation document.
01
Measurement principle and product highlights
Digital sensor output supports long-distance transmission and project integration
Automatic cleaning can be selected to reduce maintenance in fouling applications
Reverse-polarity protection for sensor power and RS485 A/B wiring
Three 4–20 mA outputs, three configurable relays and Modbus RS485
Time display, data storage, historical-data review and optional wireless transmission
02
Verified technical specifications
Confirm the normal and peak NTU, process location, particles and bubbles, freshwater or seawater, pressure or sample flow, mounting, cleaning, cable and control interfaces before quotation.
- Measurement principle
- Infrared 90° scattered light
- Turbidity range
- 0.01–100 NTU; 0.01–4000 NTU
- Accuracy
- ±2% of reading or ±0.1 NTU, whichever is greater
- Repeatability
- ±2%
- Resolution
- 0.01–0.1 NTU, depending on range
- Pressure rating
- ≤0.4 MPa
- Maximum flow velocity
- ≤2.5 m/s (8.2 ft/s)
- Calibration
- Sample calibration; slope calibration
- Construction
- SUS316L standard; titanium-alloy seawater version; 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 / instrument dimensions
- Ø60 × 261 mm
- Transmitter dimensions
- 145 × 125 × 162 mm
- Sensor / instrument weight
- 1.65 kg
- Transmitter weight
- 1.35 kg
- Sensor / instrument protection
- IP68 / NEMA6P
- Transmitter protection
- IP66 / NEMA4X
- Cable
- 10 m standard; extendable to 100 m
03
Recommended process fit
Raw water and intake
Track particle-load changes before clarification and treatment.
Sedimentation and clarification
Monitor clarifier performance and process upsets continuously.
Wastewater
Measure turbidity trends in municipal and industrial wastewater stages.
Industrial process water
Integrate turbidity into circulating-water and process-control projects.
04
Items to confirm
First distinguish wide-range immersion monitoring from low-range flow-through monitoring, then confirm the real operating conditions.
- 01Normal, peak and alarm turbidity
- 02Raw water, sedimentation, filter outlet, finished water or wastewater point
- 03Particles, color, bubbles, fouling and cleaning conditions
- 04Pressure or sample flow, mounting space, cable and control interfaces
05
Project documents available on request
After receiving the operating conditions, we prepare the current configured datasheet, installation confirmation, I/O schedule and quotation. The clean product image is not a dimensional drawing.
Get a quote- Configured model datasheet→
- Mounting or flow-cell confirmation→
- Cable and I/O schedule→
- Project quotation→
06
Compare other turbidity models
Online Turbidity Analyzer
View product↗
Compact Online Turbidity Analyzer
View product↗
Low-Range Flow-Through Turbidity Analyzer
View product↗07
Selection questions
Should I select PTU or PLTU?+
PTU uses an immersion online sensor for raw water, wastewater and process water. PLTU is a low-range flow-through configuration for filter outlet, finished water and direct drinking water.
Can models with similar ranges be interchanged?+
No. Accuracy, pressure or sample flow, sensor construction, material, protection and process connections also differ.
Can the clean product image be used as a dimensional drawing?+
No. It provides consistent public presentation. Dimensions, interfaces and accessories come from the verified specifications and order confirmation.
Contact FUNEL
Tell us what you need to measure.
We will respond with a recommended configuration, supporting documentation and quotation.