Differential pressure
Deltabar FMD77

Differential pressure transmitter with one diaphragm seal for level measurement

• 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