Fischer NK10 – Level switch -corrosion resistant float, high operating temperature

Fischer NK10 is high accuracy, liquid level switch with high repeatability reed microswitches. It is equipped with corrosion-resistant stainless steel float and suitable for installation for media temperature upto 400&deg C.


Fischer NK10 – Liquid level switch with corrosion-resistant float, for high operating temperature

pdf-imageRugged, stainless steel ball float, corrosion resistant, suitable high media temperature operation, level switch with reed microswitch
Make: Fischer Messtechnik (Germany)
Model: NK10


Fischer NK10 is accurately monitoring level limit switch. It is suitable for installation at heat and process engineering plants, to ensure lowest permissible liquid level. The instrument meets DIN 4574 requirement as level limiter.
NK10 series instruments are structural tested and have received the DIN registration number / prototype test mark of DIN CERTCO Gesellschaft fur Konformitatsbewertung (company for validation of conformity).

Fischer NK10 - level limit with microswitch, high operating temperature, corrosion resistant
Fischer NK10 – level limit with microswitch, high operating temperature, corrosion resistant

Working Principle:

The stainless steel ball float of level limiter is installed inside the fluid vessel. The float moves when level changes. This movement is transported directly to a microswitch by the float rod. The float rod is sealed by metal bellows and its centre of rotation is outside of the pressure chamber.

A test button is located outside the pressure chamber to enable a function test acc. to DIN 32728 without lowering of level. If the test button is pressed the floated is moved against its buoyancy.

If the instrument is used as level limiter, a locking and unlocking mechanism acc. to DIN 32728 need to be installed into the subsequent electrical control. This safety device must meet demands of DIN 57116 / VDE 0116.


Key Features:

  • Corrosion resistant float
  • Suitable for high operating temperature up to 400° C.
  • Stainless steel material in media contact
  • Double wall metal bellows of stainless steel
  • Varnish heat resistant

Key Specifications:

  • Maximum operating pressure: 10 bar or 16 bar
  • Maximum medium temperature: 350° C or 400° C
  • Permissible ambient temperature: 70° C
  • Max. load data: 250V, 6A
  • Electrical connection: internal connector block
  • Ingress protection: IP55 acc. to DIN EN 60529
  • Minimum specific density: > 0.6 kg/dm3
  • Switching hysteresis: approx 6 mm
  • Mounting: horizontal
  • Float system: Stainless steel 1.4301
  • Metal bellows: Stainless steel 1.4541
  • Welded socket: St. 35.8
  • Flange: 1.0425 (H II) resp. 15 Mo 3


Application areas:

  • Monitoring of minimum or maximum filling levels of vessels
  • Protection of pumps against dry running

Industrial areas:

  • Power plants
  • Marine, shipping, ship building
  • Water, effluent treatment system