Technical Data
CompareContinuous / Liquids
| Measuring Principle | Differential pressure |
| Characteristic / Application | Electronic differential pressure transmitter with ceramic sensor (Ceraphire) for level, volume or mass measurement in liquids. |
| Supply / Communication | 4...20 mA HART: 12...45V DC Exia: 12...30V DC |
| Accuracy | 0.075% of individual sensor, "PLATINUM" 0.05% of individual sensor |
| Long term stability | 0.05% of URL/year of individual sensor |
| Ambient temperature | –40...+80°C (–40...+176°F) |
| Process temperature | –25...+150°C (–13...+302°F) |
| Process pressure / max. overpressure limit | 60 bar (900 psi) |
| Pressure measuring range | 100mbar...40bar (1.5psi...600psi) |
| Process connection | Threads Flanges (DIN, ASME, JIS) |
| Process connection hygienic | DIN11851 DIN11864-1 Tri-Clamp DRD Varivent |
| Communication | 4...20 mA HART |
| Certificates / Approvals | ATEX, FM, CSA, CSA C/US, IEC Ex, NEPSI, INMETRO |
| Design approvals | NACE MR0175 EN10204-3.1 |
| Hygienic approvals | FDA 3A |
| Options | 4-line digital display SS- or Aluminium housing |
| Application limits | Use Software Applicator Sizing Electronic DP |
Pressure
| Measuring Principle | Differential pressure |
| Characteristic | Electronic differential pressure transmitter with ceramic sensor (Ceraphire) for level, volume or mass measurement in liquids. |
| Supply voltage | 4...20 mA HART: 12...45V DC (Non Ex) Ex ia: 12...30V DC |
| Reference Accuracy | 0.075% of individual sensor, "PLATINUM" 0.05% of individual sensor |
| Long term stability | 0.05% of URL/year of individual sensor |
| Process temperature | –25...+150°C (–13...+302°F) |
| Ambient temperature | –40...+80°C (–40...+176°F) |
| Measuring cell | 100 mbar...40 bar (1.5 psi...600 psi) |
| Vacuum resistance | 0 mbar |
| Max. Turn down | 100 : 1 |
| Max. overpressure limit | 60 bar (900 psi) |
| Process connection | Threads Flansch (DIN, ASME, JIS) |
| Process connection hygienic | DIN11851 DIN11864-1 Tri-Clamp DRD Varivent |
| Material process membrane | Ceramic 316L, AlloyC |
| Material gasket | Viton, Kalrez, EPDM, NBR, Silicone |
| Fill fluid | Silicone Oil |
| Material housing | Die-cast aluminum Stainless steel |
| Communication | 4...20 mA HART |
| Certificates / Approvals | ATEX, FM, CSA, IECEx, NEPSI, INMETRO, UK Ex |
| Design approvals | NACE MR0175, EN10204-3.1, |
| Hygienic approvals | EHEDG, 3A |
The electronic differential pressure transmitter Deltabar FMD71 is a differential pressure system consisting of two sensors and one transmitter, used for level, volume or mass measurement of liquids in pressurized tanks or distillation columns/evaporators. One sensor measures the static pressure (high pressure) and the other measures the top pressure (low pressure). Based on these two digital pressure values, the transmitter calculates the level value (electronic differential pressure). The electronic differential pressure measuring system eliminates the problems that occur with conventional differential pressure measurement.
Advantages
The dry Ceraphire measuring cell is fully resistant to vacuum, corrosion and abrasion
Eliminates conventional mechanical problems, providing higher process suitability and reliability
The new electronic differential pressure system structure and design minimize safety risks
Minimized operating costs thanks to reduced installation, maintenance and downtime and lower spare part requirements
Multivariable level measurement: based on HART communication, measures differential pressure, top pressure and sensor temperature of the same system
Continuously indicates the health of the entire system via HART diagnostics
High repeatability and long-term stability
Areas of application
For level, volume or mass measurement of liquids in pressurized tanks or distillation columns/evaporators.
Process connections: thread, flange, flush-mounted hygienic connections
Temperature: –25...+150°C (–13...+302°F), optional 350°C (662°F)
Measuring range: 100mbar...40bar (1.5...600psi)
Measurement accuracy: up to ±0.05% for a single sensor, up to ±0.07% for the system
International explosion protection and hygienic approvals
Spare Parts & Accessories 64
64 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 71186149 | Seal ring assemblyConsists of: O-ring 43.62x2.62 EPDM/PTFE, 5pcs. Usage: FMD71/FMD72. | Details |
| 71290825 | Grounding terminalConsists of: spring washer, screw, earth handle, clamp. Usage: housing T14/T15/T17, FMB70, FMD71/FMD72/ FMD77/FMD78, PMC71, PMP71/PMP75, PMD70/PMD75. Housing F30/F31, FMB50/FMB51/FMB52/ FMB53, PMC51, PMD55, PMP51/PMP55. | Details |
| 52024110 | key housingfor external operation consists of: push button, cover + screws colour: dark grey | Details |
| 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 |
| 71186150 | Atmospheric compensation filter portPressure compensation plug, stainless steel. Sensor housing aluminium, stainless steel. Usage: FMD71/FMD72. | Details |
| 71186151 | Atmospheric compensation filter portPressure compensation plug, plastic. Sensor housing aluminium, stainless steel. Usage: FMD71/FMD72. | Details |
| 71186153 | FMD72 sensor cable gland, M20Consists of: cable gland M20 VA. O-ring, plug. Usage: FMD71/FMD72. | Details |
| 71186154 | cable entryConsists of: cable gland NPT. O-ring, plug. Usage: FMD71/FMD72. | Details |
| 71186157 | AdapterFor mounting over M12 plug for conduit use. Usage: FMD71/FMD72. | Details |
| 71440355 | Sensor connectorUsage: FMD71/FMD72. | Details |
| 71440356 | Transmitter M12/M20 4-pin connectorUsage: FMD71/FMD72. | Details |
| 71444959 | cable adapterUsage: FMD71/FMD72. | 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 |
| 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 |
| 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 |
| 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 |
Configurator / Comparison
Source:Endress+Hauserwebsite public information
Measuring principle video
Click to playManuals & Documents 6
All documents for this model6 documents · click to expand
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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