Specialist in Flush Diaphragms

Flush Diaphragm Technology (1)


Klay Instruments is specialized in Pressure and Level transmitters with Flush diaphragms for use in the Food & pharma, Pulp & paper and Water & waste water industries where clogging is a problem.

For all transmitters we use our Flush Diaphragm Technology FDT.




Advantages of Klay Level Transmitters


  • Stainless Steel Diaphragm (1)
    • Very strong
    • Standard Polished
    • Very flush with process
    • No dead area (= Hygienic)

  • Laser Welded Diaphragms (2)
    • Tested by Helium (gas tight)
    • No O-rings used.
    • Very Sanitary (= Hygienic)

  • Waves in diaphragm. Good resistance against pressure spikes (3)

  • Sensing element welded (4)
    • Tested by Helium gas
    •  No O-rings used

  • Minimum oil filling (5)



Klay Competitors disadvantages

  • Standard transmitter with ½“ BSP or NPT process connection.
    (Mostly with aluminum electronics housing) 
  • Pressure sensor
  • “Seal” with diaphragm and much oil !
  • Much oil filling. No temperature sensor right behind the diaphragm
  • Very large diaphragm. Easy damaging because it is too large !


A fixed transmitter is screwed into a so called "seal". This seal is filled with a lot of oil. This system can easily be damaged and is very sensitive to changes in process temperature. Therefore this is not a reliable solution for level measurement in the pulp and paper industry !


Advantages of Klay Level Products… Continue.
Dis-advantage Ceramic flush diaphragms comparing with other producers

Ceramic Diaphragm (1)

  •   Not polished (raw)
  •   No protection against spikes
  •   Affected by Nitric Acid
  •   Not sanitary (Not flush 5mm dead area.)
  •   Bad with temperature shocks

O-ring (2)

  •  Must be replaced (due to CIP or   SIP).
  •  Can not be replaced by customer
  •  O-ring “grows old”
  •  Not gas tight

Ceramic sensor (3)

  •  No high burst pressure (for levels)



KLAY Active Temperature Compensation…

  • All Klay transmitters are getting an active temperature compensation in our factory. 


Flush-diaphragm-flyer-FDT