Product Overview
Unlike conventional differential pressure transmitters that rely on mechanical capillary systems, the FMD71 calculates differential pressure electronically. One sensor measures static pressure at the bottom of the vessel, while the second sensor measures top pressure above the liquid level. The transmitter then derives level, volume or mass from these two digital pressure values.
Because no long capillary tubes are required, the system avoids fill-fluid migration, temperature-induced errors and complex mechanical installation. The Ceraphire ceramic sensor also supports full vacuum down to 0 mbar abs. and can withstand pressure surges up to 40 times the nominal pressure.
Key Features
- Electronic differential pressure architecture Two separate sensors and one transmitter replace traditional capillary-based differential pressure systems.
- Ceraphire dry ceramic sensor Oil-free ceramic measuring cell provides strong resistance to corrosion, abrasion and vacuum conditions.
- Full vacuum capability Vacuum resistance down to 0 mbar abs. supports vacuum tank and distillation column applications.
- High overload resistance The ceramic sensor can withstand pressure surges up to 40 times the nominal pressure.
- Multivariable measurement via HART Differential pressure, top pressure and sensor temperature can be monitored simultaneously through 4…20 mA HART communication.
- High accuracy and stability Standard accuracy up to 0.075 % per sensor; Platinum version up to 0.05 % per sensor. Long-term stability reaches 0.05 % URL/year per sensor.
- Reduced installation and maintenance effort No capillaries, no fill-fluid refilling and fewer mechanical failure points help lower lifecycle cost.
- Hygienic and industrial process connections Available with threaded, flanged and flush hygienic connections for food, beverage and pharmaceutical applications.
- International explosion protection and material certifications Supports ATEX, FM, CSA, IECEx, NEPSI and INMETRO approvals, with NACE MR0175 and EN 10204-3.1 design certifications.
Technical Specifications
|
Item |
Specification |
|
Measurement principle |
Differential pressure |
|
System design |
Two sensors + one transmitter |
|
Sensor type |
Ceraphire dry ceramic sensor |
|
Supply voltage |
4…20 mA HART: 12…45 V DC (Non-Ex); 12…30 V DC (Ex ia) |
|
Reference accuracy |
0.075 % per sensor; Platinum: 0.05 % per sensor |
|
Long-term stability |
0.05 % URL/year per sensor |
|
Process temperature |
–25…+150 °C (–13…+302 °F) |
|
Ambient temperature |
–40…+80 °C (–40…+176 °F) |
|
Sensor range |
100 mbar…40 bar (1.5 psi…600 psi) |
|
Vacuum resistance |
0 mbar abs. |
|
Span ratio |
Up to 100:1 |
|
Maximum overpressure limit |
60 bar (900 psi) |
|
Process connections |
Thread; Flange (DIN, ASME, JIS) |
|
Hygienic connections |
DIN11851, DIN11864-1, Tri-Clamp, DRD, Varivent |
|
Process membrane material |
Ceramic; 316L; Alloy C |
|
Gasket material |
Viton, Kalrez, EPDM, NBR, Silicone |
|
Fill fluid |
Silicone oil |
|
Housing material |
Powder-coated die-cast aluminum; Stainless steel |
|
Communication |
4…20 mA HART |
|
Certifications |
ATEX, FM, CSA, IECEx, NEPSI, INMETRO |
|
Design / hygienic certifications |
NACE MR0175; EN 10204-3.1; EHEDG; 3A |
Typical Applications
- Level, volume and mass measurement in pressurized tanks
- Vacuum vessel level monitoring
- Distillation column and evaporator level measurement
- Applications with aggressive, corrosive or abrasive media
- High-column level measurement where capillary systems are difficult to install
- Processes requiring multivariable monitoring via HART
- Food, beverage and pharmaceutical hygienic level measurement
- Applications where reduced maintenance and long-term stability are required
Frequently Asked Questions
How does the FMD71 measure differential pressure without capillaries?
The FMD71 uses two separate ceramic sensors. One sensor measures bottom static pressure, and the other measures top pressure. The transmitter calculates differential pressure electronically from these two digital signals.
What is the advantage of the Ceraphire ceramic sensor?
Ceraphire is a dry, oil-free ceramic measuring cell. It offers strong corrosion and abrasion resistance, full vacuum capability and high overload resistance up to 40 times the nominal pressure.
Can the FMD71 be used in vacuum applications?
Yes. The ceramic sensor supports vacuum down to 0 mbar abs., making it suitable for vacuum tanks and distillation systems.
Is the FMD71 suitable for hygienic applications?
Yes. It is available with hygienic process connections and holds EHEDG and 3A certifications.
What communication protocol does the FMD71 support?
The FMD71 supports 4…20 mA HART, allowing multivariable monitoring of differential pressure, top pressure and sensor temperature.
If you need a quotation for the Endress+Hauser Deltabar FMD71, please provide the complete manufacturer type code. We can provide pricing based on the specified selection code.We will review the code and return a quotation accordingly.
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