Level Sensors

i-Series Sensors

Part No. NMi

Intelligent sensors for level measurement

Ultrasonic sensors with integrated transmitter for measurement of distance, level, empty space or volumes. Suitable for harsh ambient conditions.

  • Sensor as independent, comfortable level measurement
  • Pre-programmed measurement range steps of 3, 6, 10 and 15 m
  • Ideally suitable for battery operation through quick measurement times
  • Resistant to humidity, aggressive environments and heavy temperature fluctuations
  • IP68 protection
  • Can be directly connected to PLC
  • Saves time and space, no transmitter installation needed
  • DATEM - digital echo processing with automatic false echo avoidance
  • Ex-approval according to ATEX for Zone 1; optional for Zone 0
  • Easy wiring directly to terminal unit in Ex-areas (no Zener barrier required)

i-Series level sensors can be used to measure distance, level, empty space or volumes of liquids in any application where highly accurate level measurements are required.

The level sensors are designed for use in poor ambient conditions. Soiling as well as wear and tear is avoided thanks to non-contacting measurement.

Since transmitter and sensor share the same fully encapsulated enclosure the unit can be easily installed with low space requirements. Extensive programming works are not needed through pre-programmed measurement range steps. The sensors can be directly connected to any PLC, NIVUS GPRS data logger and all systems processing measurement values featuring an active mA-input.

The level sensors utilise a particular energy-efficient sensor concept. Thanks to minimum startup times and measuring cycles it is possible to obtain very long lifetimes with independent and self-sufficient battery-powered data loggers.

False echoes can be avoided manually if required by using a free PC software. Additionally all parameters relevant for adjustment of the measurement range can be optimised and documented.

The i-Series level sensors can be easily integrated into existing process conducting systems. 

The standardised output of readings allows direct connection to a PLC without the need for additional programming works. 


Typical applications

  • Wastewater: stormwater overflow tanks and storage sewers, clarifiers, pump stations, screening plants, flow measurements, tank volume measurements, container monitoring, irrigation facilities
  • Drinking water: tank level measurements, water treatment, sweater desalination plants, level measurements
  • Flood protection: stormwater retention tanks, level measurements with remote data transmission, surface water bodies
  • Power generation: cooling water circuits, hydropower plants
Power supply 10-28 V DC
Enclosure material: Valox 357 PBT PVDF (optional)
Process connection 1" BSP/NPT Standard
Protection IP 68 (5 Bar)
Ex-Approval II 2 GD Ex m IIC T4 or II 1 GD Ex ia IIC T4
Outputs 4 - 20 mA (3,8 - 22 mA, 2-wire)
HART® (for programming via NIVUS software)
Functions Level, distance, empty space, volume and linearisation using 16 breakpoints
Configuration PC software for parameter setting, echo evaluation, linearisation and false echo avoidance
Cable lengths 5, 10, 20, 30, 50 oder 100 m; futher lengths on request
Echo processing Automatic and self-learning echo suppression
Startup time 4 sec. typical

Specifications subject to change.

Coating of transmitter surface PTFE soft foam for dusty bulk solids (for P 06, P 10 and P 15)
Flood protection head For generation of echo loss and alarm output in case of flood. No dirt on the sensor face in case of flood (for all types without front thread)
Flange type for all type of flanges DIN DN50 / DN 80 / DN100 / DN150 / DN200, ANSI 2 " / 3" / 4" /6" / 8" /
Enclosure material: PVDF for aggressive media, max. 70°C (for i-6, i- 10 and i-15)
Front Thread Front thread 1.5" for i-3 and i-6
front thread 2" for i-10

Specifications subject to change.

Sensor Type i-3
Measurement range 0,125 m - 3 m
Transmit frequency 125 KHz
Operating temperature - 40 °C to + 80°C
Beam angle <10°
Measurement uncertainty 2 mm
Resolution 1 mm

Specifications subject to change.

Sensor Type i-6
Measurement range 0,3 m - 6 m
Transmit frequency 75 KHz
Measurement uncertainty 4 mm
Resolution 2 mm
Beam angle <10°

Specifications subject to change.

Sensor Type i-10
Measurement range 0,3 m - 10 m
Transmit frequency 50 KHz
Operating temperature from - 40 °C to + 80 °C
Beam angle <10°
Measurement uncertainty < 6 m: 3 mm; > 6 m: 6 mm
Resolution 3 mm

Specifications subject to change.

Sensor Type i-15
Measurement range 0,5 m - 15 m
Transmit frequency 41 KHz
Operating temperature from -40 °C to +80 ° C
Beam angle <10°
Measurement uncertainty < 10 m: 5 mm; > 10 m: 10 mm
Resolution 5 mm

Specifications subject to change.

Brochure i-Series

i-Series - Intelligent Level Sensors with integrated Transmitter

Instruction Manual i-Series

Instruction Manual for i-Series intelligent Sensors

Technical Information USB HART-Modem

Connections of HART-Modem to i-Serie Sensors

Declaration of Conformity Ex Ultrasonic Sensors i-Series

Ex Ultraschallsensoren i-Serie

EG Baumusterprüfbescheinigung i-Serie_1

EG Baumusterprüfbescheinigung i-Serie_1

EG Baumusterprüfbescheinigung i-Serie

EG Baumusterprüfbescheinigung i-Serie

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