Model 990.40

Large volume diaphragm seal

Threaded connection

Selected documents
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  • For assembly (direct assembly, via a cooling element or a capillary) with measuring instruments for low pressures and with differential pressure measuring instruments
  • For corrosive, contaminated or hot media
  • Filter monitoring
  • Level measurement

Special Features

  • Internal diaphragm with large working volume
  • Special materials available
  • Low temperature error due to large diaphragm diameter (realisation of low measuring ranges possible)
  • Wide temperature application range due to large working volume
  • Integrated flushing connections (optional)


Process connection

Nominal pressure
1500 psi - 3½" diaphragm

Pressure ranges
max. 0 ... 1500 psi

Upper housing
Stainless steel 316L

Stainless steel 316L, welded with upper housing

PTFE (up to a maximum of 260 °C)

Lower housing (process connection)
Stainless steel 316L,
½ NPT (female), G ½ (female)
½ NPT or M20 x 1.5 (male), G ½ (female)

Stainless steel

Measuring instrument connection
Direct assembly (weld-in connection)

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