Specs at a glance
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Accuracy
0,075% + influence of diaphragm seal
-
Process temperature
-40°C...400°C
(-40°F...752°F) -
Pressure measuring range
100mbar...40bar
(1.5psi ... 600 psi) -
Process pressure absolute / max. overpressure limit
160bar (2400 psi)
-
Main wetted parts
Alloy C276
316L
Monel
Tantalum -
Max. measurement distance
400m (1312ft) H2O
-
Material process membrane
316L, AlloyC,
Tantal,
Gold-Rhodium
PTFE -
Measuring cell
100 mbar...40 bar
(40 inH2O...600 psi)
Field of application
The Deltabar FMD78 differential pressure transmitter with metal sensor uses two capillary diaphragm seals. Typically used in process and hygiene applications for continuous measurement of pressure differences in liquids, vapors, gases and dusts. 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.
For differential pressure, level, volume or mass measurement in liquids.
Process connections: Threads, flanges, pancake and hygienic connections
Process temperature: -70 up to +400°C (-94 to +752°F)
Measuring ranges: 100mbar to +40 bar (1.5 to 600psi)
Accuracy: ±0.075%
International explosion protection certificates, overfill prevention WHG, hygienic approvals, marine approvals, SIL
Benefits
Large variety of different process connections and membrane materials
New TempC Membrane for diaphragm seals: Minimum temperature effects and short recovery times
Highest safety due to gas tight feedthrough with capabilities up to SIL2/3, certified to IEC 61508
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)
Videos
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Pressure measuring principle
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The new TempC Membrane
Extended selection
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High-end products
- Highly functional and convenient
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
-
Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
|
Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
Predecessor
-
Measuring principle
Differential pressure
-
Characteristic / Application
Digital transmitter with metallic measuring diaphragms diaphragm seals and capillaries
Modular transmitter
Long term stability
Enhanced safety via self diagnostic functions
Secondary process barrier -
Specialities
TempC membrane
-
Supply / Communication
4...20 mA HART:
10,5...45V DC
Ex ia: 10,5...30V DC
PROFIBUS PA /
FOUDATION 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 absolute / max. overpressure limit
160bar (2400 psi)
-
Pressure measuring range
100mbar...40bar
(1.5psi ... 600 psi) -
Main wetted parts
Alloy C276
316L
Monel
Tantalum -
Process connection
Diaphragm seal (Pancakes, threads)
Flanges (DIN, ASME)
Tri-Clamp ISO2852
Hygienic connections -
Process connection hygienic
Tri-Clamp
DIN11851
NEUMO
Varivent
SMS
DRD
Universal adapter -
Max. measurement distance
400m (1312ft) 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 -
Hygienic approvals
3A, EHEDG
-
Marine approval
GL/ ABS
-
Options
HistoROM/M-Dat
4-line digital display
SS- or Aluminiumhousing
Separate housing -
Successor
PMD78B
-
Application limits
Measuring cell:
Metal welded
-
Measuring principle
Differential pressure
-
Characteristic
Digital transmitter with metallic measuring diaphragms diaphragm seals and capillaries
Modular transmitter
Long-term stability
Secondary process barrier
enhanced safety via self diagnostic functions. -
Supply voltage
4...20 mA 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
-70°C...400°C
(-94°F...752°F) -
Ambient temperature
-50°C...85°C
(-58°F...185°F) -
Measuring cell
100 mbar...40 bar
(40 inH2O...600 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
Diaphragm seal (Pancake, threads)
Flanges (DIN, ASME)
Hygienic connections
Tri-Clamp ISO2852 -
Process connection hygienic
Tri-Clamp
DIN11851
NEUMO
Varivent
SMS
DRD
Universal adapter -
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 -
Hygienic approvals
3A, FDA
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Marine approvals
GL/ ABS
-
Specialities
Diagnostic functions
TempC Membrane -
Successor
PMD78B
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