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Digisens NTU Sensor

The Digisens NTU sensor is an optical sensor for the measurement of Nephelometric Turbidity.

• IR optical sensor with optical fibre
• Range: 0 to 4000 NTU or 0-4500 mg/L
• Robust and waterproof (IP68)
• Ultra low-power consumption
• Digital output: Modbus RS-485 or SDI-12

APPLICATIONS:
• Urban wastewater treatment (inlet/ outlet controls)
• Sanitation network
• Industrial effluent treatment
• Surface water monitoring
• Drinking water

Measurement:
Measurement Principle: Diffusion IR at 90°
Measure range: 0 to 4000 NTU in 5 ranges:
• 0 – 50 NTU
• 0 – 200 NTU
• 0 – 1000 NTU
• 0 – 4000 NTU
• AUTOMATIC
OR 0 to 4500 mg/L
Calibration: Range 0-500 mg/L according to NF EN 872
Range >500 mg/L according to NF T 90 105 2
Resolution: 0.01 to 1 NTU – mg/L
Accuracy: < ±5%
Temperature Measurement: NTC Thermistor
Interface: Modbus RS-485 (standard); SDI-12 (optional)
Measurement Frequency: 1Hz
Power Requirement: 5 to 12 volts DC
Standby Current Draw: 40 μA
Average RS485 Draw (1 measurement/second): 820 μA
Average SDI12 Draw (1 measurement/second): 4.2 mA
Current Pulse: 500 mA
Sensor:
Operating Temperature: 0°C to +50°C
Storage Temperature: -10°C to +60°C
Dimensions: Diameter: 27 mm; length: 170 mm
Weight: 300g (sensor and 3 meter cable)
Construction: PVC, DELRIN, Quartz, PMMA, Polyamide
Maximum Pressure: 5 bar
Connection: 9 armoured connectors, polyurethane jacket, bare-wires or waterproof Fischer connector

NTU Wiring

Dimensions (mm)NTU Dimensions

OPTICAL TECHNOLOGY

• The measurement principle is based on IR nephelometry/850 nm. The sensor can be calibrated with a formazine standard solution.
• The NTU sensor uses low-cost optical technology, requiring very little maintenance and no consumables.

DIGITAL COMMUNICATION

The sensor can be connected to any types of transmitters, display units, controllers, or data loggers with Modbus RS-485 or SDI-12 inputs. The optical sensor saves its calibration data for better measurement management.

INTEGRATED TRANSMITTER

All data concerning calibration, history, users and measurements are processed within the NTU sensor and transmitted via RS-485 or SDI-12.

PHYSICAL CHARACTERISTICS

Compact, robust and light, the PVC sensor allows for handheld or fixed unit application.