EPA 90° scattered-light method dedicated to low-range turbidity
Low-range flow-through analyzer · PLTU-700
Low-Range Flow-Through Turbidity Analyzer
A separate-flow-cell configuration for low-range filter outlet, finished water, direct drinking water and desalination monitoring.
0.001–100 NTU300–700 mL/minEPA 90°
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
Stable external flow cell separates the optical measurement from the process line
Sample and slope calibration with simple cleaning access
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
- EPA 90° scattered light; flow-through
- Turbidity range
- 0.001–100 NTU
- Accuracy
- 0.001–40 NTU: ±2% of reading or ±0.015 NTU, whichever is greater; 40–100 NTU: ±5%
- Repeatability
- ±2%
- Resolution
- 0.001–0.1 NTU, depending on range
- Sample flow
- 300–700 mL/min
- Calibration
- Sample calibration; slope calibration
- Process connections
- Inlet 1/4 NPT; outlet 1/2 NPT
- Construction
- ABS + SUS316L standard; ABS + titanium-alloy seawater version; nitrile rubber seals; 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
- -15–60°C
- Operating temperature
- 0–45°C, non-freezing
- Sensor / instrument dimensions
- 304 × 207 × 392.5 mm
- Transmitter dimensions
- 145 × 125 × 162 mm
- Sensor / instrument weight
- 2.1 kg
- Transmitter weight
- 1.35 kg
- Sensor / instrument protection
- IP65, indoor
- Transmitter protection
- IP66 / NEMA4X
- Cable
- 3 m standard; extendable to 30 m
03
Recommended process fit
Filter outlet
Low-range verification after filtration and polishing stages.
Finished drinking water
Continuous treated-water monitoring where small changes matter.
Desalination
Monitor filtration and product-water stages in desalination systems.
Cooling and reuse water
Track low-range turbidity in filtered cooling and reclaimed water.
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
Wide-Range Online Turbidity Analyzer
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Online Turbidity Analyzer
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Compact Online Turbidity Analyzer
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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.