Endress Hauser AG

- Model FMD77 - Differential Pressure Transmitter

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Differential pressure transmitter with one diaphragm seal for level measurement. The Deltabar FMD77 differential pressure transmitter with metal sensor uses a one-sided diaphragm seal or diaphragm seals on both sides with a capillary on the low pressure side. Typically used in the process industry for continuous level measurement in liquids. The integrated HistoROM data module makes the management of process and device parameters easy. Designed according to IEC 61508 for use in SIL3 safety applications.

  • Large variety of different process connections and membrane materials

  • Highest safety due to gas-tight feedthrough with capabilities up to SIL2/3, certified to
    IEC 61508

  • New TempC Membrane minimizes influences of ambient and process temperature fluctuations

  • Easy menu-guided commissioning via local display, 4 to 20 mA with HART, PROFIBUS PA, FOUNDATION Fieldbus

  • HistoROM data management concept for fast and easy commissioning, maintenance and diagnostics

  • Cost savings with modular concept for easy replacement of sensor, display or electronics

  • Seamless and independent system integration (HART/PA/FF)

For level, volume or mass measurement in liquids.

  • Process connections: Threads and flanges

  • Temperature: -70 to +400°C (-94 to +752°F)

  • Measuring ranges: +100mbar to +16bar (+1.5 to +240psi)

  • Accuracy: ±0.075%

  • International explosion protection certificates, overfill prevention WHG, hygienic approvals, marine approvals, SIL

  • Measuring principle

    Differential pressure

  • Characteristic

    Digital transmitter with metallic measuring diaphragms, one side with diaphragm seal
    Modular transmitter
    Long-term stability
    Secondary process barrier
    enhanced saftey via self diagnostic functions

  • Supply voltage

    4...20mA HART

    10,5...45V DC (Non Ex):

    Ex ia: 10,5...30V DC

    PROFIBUS PA:

    9...32 V DC (Non Ex)

    FOUNDATION Fieldbus:

    9...32 V DC (Non Ex)

  • Reference Accuracy

    0,075% + influence of diaphragm seal

  • Long term stability

    0,05% of URL/year
    0,125% of URL/5 years

  • Process temperature

    -40°C...400°C
    (-40°F...752°F)

  • Ambient temperature

    -50°C...85°C
    (-58°F...185°F)

  • Measuring cell

    100 mbar...16 bar
    (40 inH20...240 psi)

  • Smallest calibratable span

    5 mbar (0.075 psi)

  • Vacuum resistance

    50 mbar (0.73 psi)

  • Max. Turn down

    100:1

  • Max. overpressure limit

    160 bar
    (2400 psi)

  • Process connection

    Low pressure side:
    1/4-18NPT
    RC1/4'
    High pressure side:
    Flanges (DIN, ASME, JIS)

  • Material process membrane

    316L, AlloyC,

    Tantal,

    Gold-Rhodium,

    PTFE

  • Material gasket

    None, diaphragm seal welded

  • Fill fluid

    Silicone oil,

    Inert oil,

    Vegetable oil

    Low- temperature oil

    High- temperature oil

  • Material housing

    316L, Die-cast aluminum

  • Communication

    4...20 mA HART
    PROFIBUS PA
    FOUNDATION Fieldbus

  • Certificates / Approvals

    ATEX, FM, CSA, CSA C/US, IEC Ex, INMETRO, NEPSI, EAC

  • Safety approvals

    SIL
    WHG/ Overfill prevention

  • Design approvals

    NACE MR0175
    EN10204-3.1

  • Specialities

    Diagnostic functions

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