Normal and peak NTU
Select the optical configuration using both normal operation and upset conditions.
Browse by parameter
Online turbidity analyzer selection center
Compare three immersion PTU sensors and two low-range flow-through PLTU analyzers for raw water, clarification, wastewater, filter outlet and finished water.
NTUTurbidity measurement
01
Select the optical range for the process
Low-level treated-water monitoring and high-range raw-water or wastewater monitoring place different demands on the optical path and cleaning arrangement. The expected range, particle characteristics, bubbles, mounting position and maintenance access should all be reviewed.
02
Confirm these conditions before selection
Process location
Raw water, a sedimentation tank, filter outlet and wastewater channel need different installation decisions.
Fouling and bubbles
Review cleaning frequency, flow velocity and mounting position to reduce false signals.
Materials and signals
Confirm freshwater or seawater materials and PLC/SCADA outputs.
03
Typical applications
Raw-water intakeSedimentation tanksFilter performanceWastewater dischargeSurface waterIndustrial process water
04
Five verified FUNEL models
PTU-800
Wide-range online turbidity analyzer
Dual-beam immersion analyzer with low- or high-range configurations.
Verified facts- 0.01–100 / 0.01–4000 NTU
- ±2% or ±0.1 NTU
- ≤0.4 MPa
PTU-600
Online turbidity analyzer
Mid-size SUS316L immersion sensor for raw water, wastewater and process monitoring.
Verified facts- 0.01–3000 NTU
- ±5% or ±0.5 NTU
- ≤0.4 MPa
PTU-500
Compact online turbidity analyzer
Small immersion sensor for lower-pressure raw, surface and wastewater monitoring.
Verified facts- 0.01–1000 NTU
- ±5% or ±0.3 NTU
- ≤0.1 MPa
PLTU-700
Low-range flow-through turbidity analyzer
Separate flow-cell configuration for filter outlet, finished water and desalination.
Verified facts- 0.001–100 NTU
- 300–700 mL/min
- EPA 90°
PLTU-600
Compact low-range turbidity analyzer
Integrated flow-through analyzer with a 3.5-inch LCD and quick-connect sample ports.
Verified facts- 0.001–100 NTU
- 200–400 mL/min
- 1 × 4–20 mA
05
Turbidity selection questions
Should I select an immersion or flow-through analyzer?+
Use the process point first: PTU immersion sensors fit raw water, wastewater and process water; PLTU flow-through models fit low-range filter outlet and finished water.
Do all five models have the same outputs?+
PTU and PLTU-700 sheets list three 4–20 mA outputs and three relays. PLTU-600 lists one 4–20 mA output and one relay.
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