Nivovent NV 71/NV 71D

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For more than 50 years the employees of Bühler Technologies have been have been developing, manufacturing and distributing components and system solutions in the “Gas Analysis“ and “Fluidcontrol“ divisions.

We offer flexible, system-compatible sensors and devices with state-of-the-art output signals for liquid level, temperature and pressure monitoring as well as for filter and moisture monitoring in hydraulic-systems. With the oil-water and oil-air coolers, filtering units and customer-specific subsystems, we meet today’s requirements in terms of a cost-effective and reliable operation of oil installations, even in hazardous areas. The Bühler Fluidcontrol product line extends the service life of oil and components, provides connectivity for automated operation, facilitates condition monitoring and helps reduce operating and maintenance costs.

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Level and temperature switch NV 71

  • Connecting flange as per DIN 24557 T2
  • Proven and tested highly dynamic float system
  • applicable up to 230 V
  • up to 4 level contacts
  • Temperature monitoring as switch, Pt100 or 4-20 mA output

Level and temperature switch NV 71D

  • Highly visible LED display indicates the switching outputs
  • High performance air breather with replaceable element
  • Up to 4 programmable temperature switching outputs
  • Or continuous temperature signal (adjustable current or voltage) plus one programmable switching output
  • Min/Max memory, logbook function

The oil tank is the key component of hydraulic and lubrication systems. The operating oil is removed from the tank and then returned to it. Depending on what the system is used for, the levels in the oil tank can fluctuate to varying degrees.

In most applications, the level fluctuations result in an exchange of the vapour phase above the oil level with the ambient air. Therefore, virtually all oil tanks are equipped with a so-called air breather, to prevent contaminants in the ambient air from entering the system.
To reduce costs and space requirements, a number of other system-related functions such as fill level and temperature monitoring are also combined in the air breather in the Nivovent series.

The NV 71 model provides up to four adjustable bistable switching contacts for level monitoring. Combined with temperature monitoring, two level and two different temperature signal options are available. An LED display for temperature monitoring with up to four programmable switching outputs is optional or alternatively, one continuously analogue output and one switching output (can also be programmed as a frequency output).

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