Name: Deltabar S FMD77
Brand: Endress+Hauser
Availability: InStock

Differential pressure Deltabar FMD77

Phase out

Product is getting phased out

Phase out Product status

Differential pressure Deltabar FMD77

New alternatives available

Successor

Deltabar PMD78B

Phase out policy
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Phase out policy

Endress+Hauser are committed to the long term support of all our products

We undertake support and service for our products for a period of ten years after notice of product withdrawal (until spareparts are not available any more)

However we reserve us the right to offer alternative solutions including replacement products if deemed more appropriated.

Product status

Product root FMD77

Name Differential pressure Deltabar FMD77

Product status In phase out

Phase out date 12/2024

Order stop 6/2027

Spare sensor until not applicable

Calibration until not applicable

Spares available 7/2030

Repair until 7/2030

New alternative PMD78B

Maintenance advice

Differential pressure transmitter with one diaphragm seal for level measurement

Deltabar FMD77 temperature isolator long, transmitter vertical

Deltabar FMD77 temperature isolator short, transmitter vertical

Deltabar FMD77 temperature isolator short, transmitter horizontal

Deltabar FMD77 with two diaphragm seals and a capillary on the low pressure side

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Deltabar FMD77 temperature isolator long, transmitter horizontal

Pressure measuring principle

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Differential pressure Deltabar FMD77

Phase out

Differential pressure transmitter with one diaphragm seal for level measurement

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Successors

Deltabar PMD78B

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Deltabar PMD78B

Minimizes ambient and process temperature effects on your measurement thanks to the TempC membrane

Benefits

Large variety of different process connections and membrane materials
Highest safety due to gas-tight feedthrough with capabilities up to SIL2/3, certified to IEC 61508
New TempC Membrane minimizes influences of ambient and process temperature fluctuations
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)

Services and resources

Product Support Product documentation, troubleshooting articles, device details and more.

FLEXible answers to individual needs

Current product

Differential pressure Deltabar FMD77

High-end products
Highly functional and convenient

What is FLEX?

FLEX selections

Technical excellence

Simplicity

Fundamental selection Meet your basic measurement needs

Lean selection Handle your core processes easily

Extended selection Optimize your processes with innovative technologies

Xpert selection Master your most challenging applications

Variable

Learn more about the FLEX selections

Manufacturer's warranty

Engineered for confidence

Our instruments are designed for long‑lasting performance, precise measurement, and dependable operation in demanding industrial environments. Each product includes a standard manufacturer’s warranty that reflects our commitment to quality and to the trust you place in our solutions.

Should a warranty case occur, the device will be assessed and the applicable remedy will be provided in line with the warranty terms – helping ensure a reliable and efficient resolution and supporting continued operation of your measurement point.

Request for extended warranty

If you require extended warranty coverage, simply contact your local Endress+Hauser representative. Our experts will advise you on the available options to match your application and risk profile, helping you protect your investment, reduce unexpected repair costs, and ensure reliable long‑term operation beyond the manufacturer's warranty period.

Learn more

Warranty terms apply

The manufacturer's warranty and extended warranty are subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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24/7 customer portal

Personalized transaction space

Check prices and delivery times, save your favorite products, create quotes and place orders in just a few clicks and track deliveries at any time. With access to your complete order and quote history including all relevant documents you benefit from full transparency throughout the entire process.

Easy access to technical documentation

Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

My Endress+Hauser – all in one place

My Endress+Hauser is your 24/7 connection to Endress+Hauser – in the office, in the field or on the go. It brings together transaction management, documentation and software downloads, knowledge base access, customer support, engineering tools and cloud‑based IIoT services helping you work easier, faster and more efficiently.

Selection of compatible products

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Active barrier, 1 channel for 4 to 20 mA, HART® transparent with 24 to 230 V AC/DC as well as active/passive input and output, optionally with SIL and Ex

Loop-powered process indicator RIA14 for field installation

RIA14 process indicator

Loop-powered Ex d process indicator as field device for 4 to 20 mA signals, HART® transparent

RN22 intrinsically safe isolating barrier, power supply and signal doubler for hazardous areas

RN22 active barrier

Active barrier, 1/2-channel/SD for 4 to 20 mA, HART® transparent with 24 V DC as well as active/passive input and output, optionally with SIL and Ex

RNF22 power feed-in and error message module

RNF22 power feed-in/error message module

Power feed-in/error message module for simple and redundant 24 V DC supply to T-connector with fault message monitoring

RNB22 compact, high-efficiency primary switch mode power supply for DIN rail interface systems

RNB22 system power supply unit

System power supply unit for parallel operation with 100 to 250 V AC input and 24 V DC 2.5 A output as well as static/dynamic boost

Spare parts

Housing/housing accessories

Mounting set housing T14/T15 sensor

Housing/housing accessories

Order code 52020440

Drawing number 12

Housing/housing accessories

Mounting set housing T17 / sensor

Housing/housing accessories

Order code 71020596

Drawing number 12

Housing/housing accessories

Push button housing, PA/FF

Housing/housing accessories

Order code 52022418

Drawing number 13

Housing/housing accessories

Push button housing, HART, version 1

Housing/housing accessories

Order code 52022419

Drawing number 13

Spare parts

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Differential pressure - Deltabar FMD77

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CAD Drawings

Configuration support

Spare parts

Housing/housing accessories

Mounting set housing T14/T15 sensor

Housing/housing accessories

Order code 52020440

Drawing number 12

Housing/housing accessories

Mounting set housing T17 / sensor

Housing/housing accessories

Order code 71020596

Drawing number 12

Housing/housing accessories

Push button housing, PA/FF

Housing/housing accessories

Order code 52022418

Drawing number 13

Housing/housing accessories

Push button housing, HART, version 1

Housing/housing accessories

Order code 52022419

Drawing number 13

Spare parts

Selection of compatible products

RN42 active barrier

Active barrier, 1 channel for 4 to 20 mA, HART® transparent with 24 to 230 V AC/DC as well as active/passive input and output, optionally with SIL and Ex

RIA14 process indicator

Loop-powered Ex d process indicator as field device for 4 to 20 mA signals, HART® transparent

RN22 active barrier

Active barrier, 1/2-channel/SD for 4 to 20 mA, HART® transparent with 24 V DC as well as active/passive input and output, optionally with SIL and Ex

RNF22 power feed-in/error message module

Power feed-in/error message module for simple and redundant 24 V DC supply to T-connector with fault message monitoring

RNB22 system power supply unit

System power supply unit for parallel operation with 100 to 250 V AC input and 24 V DC 2.5 A output as well as static/dynamic boost

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

Product is getting phased out

New alternatives available

Phase out policy

Product status

Differential pressure Deltabar FMD77

Phase out

Differential pressure Deltabar FMD77

Product information

Selection of compatible products

Spare parts

Choose from our suggested options

Spare parts

Selection of compatible products

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Product is getting phased out

New alternatives available

Phase out policy

Product status

Differential pressure Deltabar FMD77 Phase out

Differential pressure Deltabar FMD77

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Selection of compatible products

Spare parts

Choose from our suggested options

Spare parts

Selection of compatible products

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Differential pressure Deltabar FMD77

Phase out