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Deltabar FMD77 - Differential pressure

Differential pressure
Deltabar FMD77

Differential pressure transmitter with one diaphragm seal for level measurement

FMD77
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Measuring / Application task

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  • 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

    0.08 % of URL/ year
    0.14 % of URL/ 5 years
    0.27 % of URL/ 10 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, UK Ex

  • Safety approvals

    SIL

  • Design approvals

    NACE MR0175
    EN10204-3.1

  • Specialities

    Diagnostic functions

  • Successor

    PMD78B

  • Measuring principle

    Differential pressure

  • Characteristic / Application

    Digital transmitter with metallic measuring diaphragms one side with diaphragm seal
    Modular transmitter
    Long term stability
    Enhanced safety via self diagnostic functions
    Secondary process barrier

  • Supply / Communication

    4...20 mA HART:
    10,5...45V DC
    Ex ia: 10,5...30V DC
    PROFIBUS PA /
    FOUNDATION Fieldbus:
    9...32V DC

  • Accuracy

    0,075% + influence of diaphragm seal

  • Long term stability

    0,05% of URL/year

  • Ambient temperature

    -50°C...85°C
    (-58°F...185°F)

  • Process temperature

    -40°C...400°C
    (-40°F...752°F)

  • Process pressure / max. overpressure limit

    160bar (2400 psi)

  • Pressure measuring range

    100mbar...16bar
    (1.5psi...230 psi)

  • Main wetted parts

    Alloy C276
    316L
    Monel
    Tantalum

  • Process connection

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

  • Max. measurement distance

    160m (525ft) H2O

  • 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

  • Design approvals

    EN10204-3.1
    NACE MR0175, MR0103

  • Options

    HistoROM/M-Dat
    4-line digital display
    SS- or Aluminiumhousing
    Separate housing

  • Successor

    PMD78B

  • Application limits

    Measuring cell:
    Metal welded

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