Technical Data
CompareContinuous / Liquids
| 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 / 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 |
Pressure
| 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 |
| Marine approvals | GL/ ABS |
| Specialities | Diagnostic functions TempC Membrane |
| Successor | PMD78B |
The Deltabar FMD78 differential pressure transmitter uses a metal sensor with dual-capillary diaphragm seals and is mainly used for the continuous differential pressure measurement of liquids, gases, steam and dust in the process industry and the hygiene sector. The built-in HistoROM data module facilitates process and device parameter management. It complies with IEC 61508 and meets SIL3 functional safety requirements.
Advantages
Excellent repeatability and long-term stability
High reference accuracy: up to ±0.075%, platinum version: ±0.05%
For flow and differential pressure monitoring to SIL3 requirements, compliant with IEC 61508, certified by TÜV SÜD
HistoROM®/M-DAT memory module
Function monitoring of measuring cell and electronics
Modular continuous measurement of differential pressure, static pressure and pressure (Deltabar S - Deltapilot S, Cerabar S), e.g. replaceable display, universal electronics for pressure and differential pressure measurement
Areas of application
For differential pressure, level, volume and mass measurement of liquids
Process connections: thread, flange, clamp and hygienic connections
Process temperature: -70 ... +400°C (-94 ... +752°F)
Measuring range: 100mbar ... +16bar (1.5... 240psi);
Accuracy: ±0.075%
International explosion protection approval, WHG overflow protection, hygienic approval, marine approval, SIL
Spare Parts & Accessories 78
78 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 71111056 | Atmospheric compensation filter portConsists of: Vent screw 304. Pressure compensation filter. O-ring EPDM, protection lid. Usage: FMB50, FMB51, FMB52, FMB53, FMD71, FMD72, FMD76, FMD77, FMD78, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, PMC51, PMC71, PMD70, PMD75, PMP71, PMP75, PMP51, PMP55. | Details |
| 71219639 | Atmospheric compensation filter portConsists of: vent screw 304. Pressure compensation filter. O-ring VMQ, protection lid. Usage: housing T17, FMB70, FMD76/FMD77/FMD78, PMC71, PMD70/PMD75, PMP71/ PMP75. Housing F15 at B1,BB,BD,BF,GA,ID,I1, FMB50/FMB51/FMB52/FMB53, PMC51, PMP51/PMP55. | Details |
| 52020760 | cable glandconsists of: cable gland M20 O-ring 18.72x2.62 VMQ Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 52020761 | cable entryconsists of: gasket 18.72x2.51 NBR adapter M20 > G1/2 O-ring 18.77x1.78 NBR Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 52020762 | plug connectorHarting plug set Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 52020763 | plug connectorCerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 71206971 | Seal ring assemblyConsists of: 5x O-ring 75.87x2.62 FVMQ. Usage: housing T14, FMD77/FMD78, PMD70/PMD75, PMP71/PMP75. | Details |
| 52020433 | Aluminum cover with gasketMaterial: Aluminium, coated O-ring EPDM, FDA for EEx d/XP Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 | Details |
| 52028310 | Stainless Steel CoverMaterial: 316L O-ring EPDM, FDA individual tested, EEx d/XP Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 | Details |
| 71002774 | Stainless Steel CoverMaterial: 316L flat gasket VMQ, centering ring, screw not for EEx d/XP Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 71002774 | Stainless Steel CoverMaterial: 316L flat gasket VMQ, centering ring, screw not for EEx d/XP Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 71002810 | cover with viewing windowMaterial: 316L Sight glass: mineral glass flat gasket VMQ, centering ring, screw approval 2,3,4,8,Q,W,7,8 Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 71002811 | cover with viewing windowMaterial: 316L Sight glass: Polycarbonat PC flat gasket VMQ, centering ring, screw approval A,F,R,S,U,1,6 Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 71206965 | Stainless Steel CoverMaterial: 316L. O-ring FVMQ. Individual tested, EEx d/XP. Usage: FMD76/FMD77/FMD78, PMC71, PMD70/PMD75, PMP71/PMP72/PMP75. | Details |
| 71206968 | Stainless Steel CoverMaterial: 316L. Sight glass: mineral glass,coated. O-ring FVMQ. Individual tested, EEx d/XP. Usage: FMD71/FMD72/FMD76/FMD77/FMD78, PMC71, PMD70/PMD75, PMP71/PMP75. | Details |
| 71245247 | Aluminum coverMaterial: aluminium, coated. Sight glass: mineral glass, coated. O-ring EPDM, FDA. Not for EEx d/XP. Usage: FMB70, FMD71/FMD72/FMD76/FMD77/FMD78, PMC71, PMD70/PMD75, PMP71/PMP75. | Details |
| 71245249 | Aluminum coverMaterial: aluminium. Sight glass mineral glass, coated. O-ring EPDM, FDA. Individual tested, EEx d/XP. Usage: FMD71/FMD72/FMD76/FMD77/FMD78, PMC71, PMD70/PMD75, PMP71/PMP75. | Details |
| 52020432 | Aluminum cover with gasketMaterial: Aluminium, coated O-ring EPDM, FDA not for EEx d/XP Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 52020432 | Aluminum cover with gasketMaterial: Aluminium, coated O-ring EPDM, FDA not for EEx d/XP Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 Deltapilot S FMB70 | Details |
| 52020433 | Aluminum cover with gasketMaterial: Aluminium, coated O-ring EPDM, FDA for EEx d/XP Cerabar S PMC71, PMP71/PMP75 Deltabar S PMD70/PMD75,FMD76/FMD77/FMD78 | Details |
Configurator / Comparison
Source:Endress+Hauserwebsite public information
Measuring principle video
Click to playManuals & Documents 12
All documents for this model12 documents · click to expand
Deltabar S FMD77, FMD78, PMD75 HART V02.30.zz Operating Instructions Chinese
Deltabar S FMD77/78; PMD75 FOUNDATION Fieldbus (V 04.00.zz) Operating Instructions Chinese
Deltabar S FMD77/78; PMD75 PROFIBUS PA (V 04.01.zz) Operating Instructions Chinese
仪表功能描述 Cerabar S PMC71, PMP71/75 Deltabar S FMD76/77/78, PMD70/75 Deltapilot S FMB70 Chinese
Deltabar S FMD77, FMD78, PMD75 HART V02.30.zz Operating Instructions English
Deltabar S FMD77/78; PMD75 FOUNDATION Fieldbus (V 04.00.zz) Operating Instructions English
Deltabar S FMD77/78; PMD75 PROFIBUS PA (V 04.01.zz) Operating Instructions English
Cerabar S / Deltabar S / Deltapilot S HART V02.30.zz Description of Instrument Functions English
Cerabar S / Deltabar S / Deltapilot S, Description of device functions FOUNDATION Fieldbus V 04.00.zz English
Cerabar S /Deltabar S /Deltapilot S Description of device functions PROFIBUS PA V04.01.zz English
Cerabar S /Deltabar S /Deltapilot S Description of device functions PROFIBUS PA English
TI Deltabar S PMD75, FMD77, FMD78 Chinese
Case Studies
Municipal Wastewater Treatment · Differential Pressure Measurement — Application Case
Project Overview
The site is the inlet, biological and outlet stages of a municipal plant. The customer wanted Differential Pressure Measurement properly configured on the existing plant, with the aim of differential pressure for flow and filter monitoring.
Technical Challenges
What actually causes trouble is high solids and corrosive fractions, with large diurnal flow swings, and effluent parameters drift and probes foul with sludge and biofilm. All of this means the Differential Pressure Measurement configuration has to involve checking static pressure limit, overload margin and impulse lines.
Configuration
Supply and installation were organised through the pressure range: pressure solution matched to process pressure and temperature. On site this meant checking static pressure limit, overload margin and impulse lines, checked line by line against: stable compliance with Grade 1A discharge limits and online data reporting.
Performance
After commissioning the outcome is filters changed on pressure drop, using cartridges to their full life, and the readings are now used for process tuning.
Food & Beverage · Differential Pressure Measurement — Application Case
Site Conditions
This is a Food & Beverage customer whose plant is at dosing, pasteurising, filling and CIP stages. The main task was differential pressure for flow and filter monitoring.
The Problem
The difficulty lies in syrups, dairy and beverages that scale easily, under strict hygienic requirements; at the same time frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles. Specification therefore means checking static pressure limit, overload margin and impulse lines.
What We Did
We took a pressure range approach — pressure solution matched to process pressure and temperature. Delivery was built around checking static pressure limit, overload margin and impulse lines, with point-by-point checks on: food-safety and hygienic design per 3-A / EHEDG.
Operating Outcome
In service the system performs as intended — filters changed on pressure drop, using cartridges to their full life, with routine maintenance falling noticeably.
Chemical & Pharmaceutical · Differential Pressure Measurement — Application Case
Application Context
reactors, metering vessels and finished-product tanks is a typical Chemical & Pharmaceutical duty. The project started from Differential Pressure Measurement, focusing on differential pressure for flow and filter monitoring.
Process Constraints
corrosion plus Ex protection shortens instrument life and makes downtime costly, and highly corrosive media with solvents and crystallisation, partly in explosive atmospheres only amplify it. The Differential Pressure Measurement specification must therefore cover checking static pressure limit, overload margin and impulse lines.
Delivery Approach
Delivery was handled as the pressure range — pressure solution matched to process pressure and temperature. Execution centred on checking static pressure limit, overload margin and impulse lines, together with Ex certification and GMP traceability of records.
Field Results
Operation shows the benefit clearly — filters changed on pressure drop, using cartridges to their full life, with confidence in this measuring point improving markedly.
Power & Energy · Differential Pressure Measurement — Application Case
Customer Profile
The typical setting in Power & Energy is boiler feedwater, turbine condensate and FGD/DeNOx systems. The measuring point is Differential Pressure Measurement; the focus is differential pressure for flow and filter monitoring.
Key Difficulties
Conditions are high temperature and pressure with both steam and saline water and, on top of that, drift under high temperature and pressure, with very costly unplanned outages, which a standard configuration cannot handle for long. The design therefore starts with checking static pressure limit, overload margin and impulse lines.
Implementation
The scope ran through the pressure range: pressure solution matched to process pressure and temperature. Technically it hinges on checking static pressure limit, overload margin and impulse lines, and on these requirements: compliance with power-industry codes and unit availability targets.
Customer Benefit
In practice this means filters changed on pressure drop, using cartridges to their full life, which cut the workload on the site maintenance team.
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