Diaphragm Seal System

Diaphragm for Pressure Transmitters

Differential Pressure Level Solutions

Diaphragm seals are used to prevent the process medium from entering directly into the pressure-sensing assembly of the differential, gauge, or absolute pressure transmitter.

The applications that are suitable for pressure transmitter diaphragm seal systems manufactured by Yokogawa are measuring the liquid level, density, flow, and pressure of:

  • high/low-temperature fluids
  • highly corrosive/high viscosity fluids
  • the fluids which may cause clogging of impulse piping in the low temperature
  • toxic fluids
  • the fluids containing suspended solids that are deposited in the impulse piping and may cause clogging.
Diaphragm Seal Transmitter Diaphragm Seal


  • EJXC40A (DRS)

    • DP Accuracy: ±0.055% of Span
    • Stability: ±0.1% of URL per 10 years
    • Static Pressure Accuracy: ±0.04% of Span
    • MWP: Up to flange rating
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Yokogawa DPharp EJA/EJX Pressure transmitters do not need frequent re-zeroing due to superior long term stability, it contributes to reduce maintenance time.


Incorrect measurements can cause tanks to overflow creating potential safety or environmental problems; or, low levels can cause pump damage.


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