Light scattering turbidity sensor EXpure 191

NIRcompactRS-485

Product overview
EXpure 191 is a compact NIR turbidity sensor designed for continuous monitoring of very low turbidity in water treatment and process applications. The instrument uses a 90° scattered-light (nephelometric) measurement suitable for swimming pools, drinking water control points and other low-turbidity monitoring locations.

Your advantages

• Compact design with integrated amplifier for inline installation
• Nephelometric measurement compliant with DIN EN 27027 and ISO 7027
• Durable sapphire windows for long service life
• Simple referencing procedure without extra tools
• LED light source for stable, maintenance-friendly operation
• Parameterisation via EXpert software for fast setup
• No routine calibration required by the user

Applications

• Color-independent turbidity monitoring in potable and process water
• Swimming pool water quality control
• Detection of very low turbidity levels in distribution points
• Optimization of flocculant dosing
• Filter performance verification

Configuration (examples of available options on the product page)

• Measuring range: 0...10 FNU / 0...10 NTU
• Wetted materials: PE-HD or stainless steel 1.4435 (316L)
• Design / nominal size: Flow-through cell DN32 (1 1/4")
• Process connection: G1/4" female thread
• Parameterisation variants: Standard or Swimming pool
• Interfaces: Modbus RTU (RS485) or Modbus RTU (RS485) + analogue 4...20 mA

Technical specifications

• Max. measuring range: 0...10 FNU / 0...10 NTU
• Resolution: 0.01 FNU / 0.01 NTU
• Accuracy: ±1% of final value
• Reproducibility: ≤1% of final value
• Light source: LED
• Optical unit: Stainless steel 1.4435 (316L)
• Windows: Sapphire
• Sealing: EPDM
• Flow-through cell: Plastic (PE-HD black)
• Supply voltage: 24 V DC
• Process connection: G1/4" thread
• Process temperature: 1...50 °C
• Process pressure: 0...6 bar
• Electrical connection: 8-pin connector (IP68)
• Interfaces: RS485 Modbus, 0/4...20 mA
• Parameterisation: EXpert software
• Flow rate: 30...80 l/h
• Protection class: IP65