Endress+Hauser Deltabar FMD71 Manual

Electronic differential pressure transmitter with ceramic and metal sensors
Application
The Deltabar FMD71/FMD72 is used to measure the
differential pressure or level, volume or mass of liquids in
pressurized or vacuum vessels
Your benefits
The electronic differential pressure system eliminates
traditional mechanical issues resulting in greater process
availability and reliability
• Safety risks are minimized with the electronic differential
pressure system architecture and design
• Lowest total cost of ownership due to reduced installation
time, maintenance, downtime and spare requirements,
downtime and spare requirements.
• Multivariable level measurement: HART-based differential
pressure, head pressure and sensor temperatures from one
system
• Continuous health indication of the entire system via HART-
based diagnostic
• High reproducibility and long-term stability
• Overload-resistant and function-monitored
Products Solutions Services
Technical Information
Deltabar FMD71, FMD72
Level measurement with electronic differential pressure
TI01033P/00/EN/05.15
71281272

Deltabar FMD71, FMD72
2 Endress+Hauser
Table of contents
Document information ....................... 4
Document function ............................ 4
Symbols used ................................ 4
Documentation ............................... 5
Terms and abbreviations ........................ 6
Registered trademarks .......................... 6
Function and system design ................... 7
Measuring principle - electronic differential pressure
measurement ................................ 7
Measuring system ............................. 7
Device features ............................... 8
Product design ............................... 8
System integration ............................ 9
Input .................................... 10
Measured variable ............................ 10
FMD71: measuring range of individual sensors ......... 10
FMD72: measuring range of individual sensors ......... 11
Output .................................. 12
Output signal ............................... 12
Signal range 4 to 20 mA ........................ 12
Signal on alarm 4 to 20 mA ...................... 12
Maximum load .............................. 12
Dead time, time constant ....................... 13
Dynamic behavior, current output .................. 13
Dynamic behavior, HART ....................... 13
Damping .................................. 13
alarm current ............................... 13
Firmware Version ............................ 13
Protocol-specific data .......................... 14
Power supply ............................. 15
Terminal assignment .......................... 15
Supply voltage .............................. 15
Cable entries ............................... 16
Cable specification for transmitter connection .......... 16
Residual ripple .............................. 16
Influence of power supply ....................... 16
Overvoltage protection ......................... 16
Performance characteristics of ceramic process
isolating diaphragm ........................ 17
Reference operating conditions ................... 17
Influence of the installation position depending on sensor .17
Resolution ................................. 17
Vibration effects ............................. 17
Application limits ............................ 17
Reference accuracy ........................... 18
Thermal change of the zero output and the output span ... 18
Total performance ............................ 19
Long-term stability ........................... 19
Total error ................................. 20
Warm-up period ............................. 20
Performance characteristics of metallic process
isolating diaphragm ........................ 21
Reference operating conditions ................... 21
Influence of the installation position depending on sensor .21
Resolution ................................. 21
Vibration effects ............................. 21
Application limits ............................ 21
Reference accuracy ........................... 22
Thermal change of the zero output and the output span ... 22
Total performance ........................... 23
Long-term stability ........................... 23
Total error ................................. 23
Warm-up period ............................. 23
Installation ............................... 24
Mounting location ............................ 24
Orientation ................................ 24
General installation instructions ................... 24
Thermal insulation - FMD71 high-temperature version ... 24
Installing the sensor modules .................... 25
Mounting sensor modules with PVDF installation
coupling .................................. 25
Installing the transmitter ....................... 25
Sensor and transmitter cable ..................... 26
Environment .............................. 27
Ambient temperature range ..................... 27
Storage temperature range ...................... 27
Climate class ............................... 27
Degree of protection .......................... 27
Vibration resistance ........................... 27
Electromagnetic compatibility .................... 27
Process .................................. 28
Process temperature range for devices with ceramic
process isolating diaphragm FMD71 ................ 28
Process temperature range for devices with metallic
process isolating diaphragm FMD72 ................ 29
Pressure specifications ......................... 29
Mechanical construction .................... 30
Device height ............................... 30
T14 transmitter housing (optional display on the side) .... 31
In preparation - T17 transmitter housing (optional display
on the side) ................................ 31
Sensor housing .............................. 32
Selecting the electrical connection ................. 32
FMD71 process connections, internal process isolating
diaphragm ................................. 33
FMD71 process connections, internal process isolating
diaphragm ................................. 34
FMD71 process connections, internal process isolating
diaphragm ................................. 35
FMD71 process connections, flush-mounted process
isolating diaphragm ........................... 36
FMD71 process connections, flush-mounted process
isolating diaphragm ........................... 37

Deltabar FMD71, FMD72
Endress+Hauser 3
FMD71 process connections, flush-mounted process
isolating diaphragm ........................... 38
FMD71 process connections, flush-mounted process
isolating diaphragm ........................... 39
FMD71 process connections, flush-mounted process
isolating diaphragm ........................... 42
FMD71 process connections, flush-mounted process
isolating diaphragm ........................... 43
FMD71 process connections, flush-mounted process
isolating diaphragm ........................... 44
FMD72 process connections, internal process isolating
diaphragm ................................. 45
FMD72 process connections, internal process isolating
diaphragm ................................. 46
FMD72 process connections, flush-mounted process
isolating diaphragm ........................... 47
FMD72 process connections, flush-mounted process
isolating diaphragm ........................... 48
FMD72 process connections, flush-mounted process
isolating diaphragm ........................... 49
FMD72 process connections, flush-mounted process
isolating diaphragm ........................... 50
FMD72 process connections, flush-mounted process
isolating diaphragm ........................... 51
Wall and pipe mounting with mounting bracket ........ 54
Materials in contact with process .................. 55
Materials not in contact with process ............... 56
Operability ............................... 59
Operating concept ............................ 59
Local operation .............................. 59
Operating languages .......................... 61
Certificates and approvals ................... 62
CE mark ................................... 62
Ex approvals ................................ 62
Suitability for hygienic processes .................. 62
Pressure Equipment Directive (PED) ................ 62
Other standards and guidelines ................... 62
CRN approval ............................... 63
Classification of process sealing between electrical
systems and (flammable or combustible) process fluids in
accordance with ANSI/ISA 12.27.01 ................ 63
Calibration unit .............................. 63
Calibration ................................. 63
Inspection certificates .......................... 63
Ordering information ....................... 65
Scope of delivery ............................. 65
Supplementary documentation ............... 66
Field of Activities ............................ 66
Technical Information ......................... 66
Operating Instructions ......................... 66
Brief Operating Instructions ..................... 66
Safety Instructions (XA) ........................ 66
Registered trademarks ...................... 66
HARTâ................................... 66

Deltabar FMD71, FMD72
4 Endress+Hauser
Document information
Document function The document contains all the technical data on the device and provides an overview of the
accessories and other products that can be ordered for the device.
Symbols used Safety symbols
Symbol Meaning
DANGER
DANGER!
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
WARNING
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
CAUTION
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
NOTICE
NOTE!
This symbol contains information on procedures and other facts which do not result in
personal injury.
Electrical symbols
Symbol Meaning Symbol Meaning
Direct current Alternating current
Direct current and alternating current Ground connection
A grounded terminal which, as far as
the operator is concerned, is
grounded via a grounding system.
Protective ground connection
A terminal which must be connected
to ground prior to establishing any
other connections.
Equipotential connection
A connection that has to be connected
to the plant grounding system: This
may be a potential equalization line
or a star grounding system depending
on national or company codes of
practice.
Symbols for certain types of information
Symbol Meaning
Permitted
Procedures, processes or actions that are permitted.
Preferred
Procedures, processes or actions that are preferred.
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information.
Reference to documentation
Reference to page
Reference to graphic
Visual inspection

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Symbols in graphics
Symbol Meaning
1, 2, 3 ... Item numbers
,… ,
Series of steps
A, B, C, ... Views
A-A, B-B, C-C, ... Sections
Documentation The document types listed are available:
In the Download area of the Endress+Hauser website: www.endress.com → Download
Brief Operating Instructions (KA): getting the 1st measured value quickly
KA01105P:
The Brief Operating Instructions contain all the essential information from incoming acceptance to
initial commissioning.
Operating Instructions (BA): your comprehensive reference
BA01044P:
These Operating Instructions contain all the information that is required in various phases of the life
cycle of the device: from product identification, incoming acceptance and storage, to mounting,
connection, operation and commissioning through to troubleshooting, maintenance and disposal.
Description of Device Parameters (GP): reference for your parameters
GP01013P:
The document provides a detailed explanation of each individual parameter in the operating menu.
The description is aimed at those who work with the device over the entire life cycle and perform
specific configurations.
Safety Instructions (XA)
Safety Instructions (XA) are supplied with the device depending on the approval. These instructions
are an integral part of the Operating Instructions.
Device Directive Documentation Option 1)
FMD71, FMD72 ATEX II 1/2G Ex ia IIC T6 Ga/Gb XA00619P BA
FMD71, FMD72 ATEX II 1/2G Ex d [ia] IIC T6 Ga/Gb XA00620P BC
FMD71, FMD72 ATEX II 3G Ex nA IIC T6 GC XA00621P BD
FMD71, FMD72 IEC Ex ia IIC T6 Ga/Gb XA00622P IA
FMD71, FMD72 IEC Ex d [ia] IIC T6 Ga/Gb XA00623P IB
FMD71, FMD72 CSA General Purpose - CD
FMD71, FMD72 NEPSI Ex ia IIC T4/T6 Ga/Gb XA01352P NA
FMD71, FMD72 NEPSI Ex d [ia] IIC T4/T6 Ga/Gb XA01352P NB
FMD71 FM C/US IS Cl.I Div.1 Gr.A-D, AEx ia, Zone 0,1,2 XA00628P FA
FMD71 FM C/US XP AIS Cl.I Div.1 Gr.A-D, Exd [ia] Zone 0,1,2 XA00629P FB
FMD71 CSA C/US XP Cl.I Div.1 Gr.A-D, Ex d [ia], Zone 0,1,2 XA00631P CB
FMD71 FM C/US NI Cl.I Div.2 Gr.A-D, Zone 2 XA00668P FD
FMD71 CSA C/US NI, Cl.I Div. 2, Gr.A-D Cl.I, Zone 2, IIC XA00670P CC
FMD71 CSA C/US IS Cl.I Div.1 Gr.A-D, Ex ia Zone 0,1,2 XA00630P CA
FMD72 CSA C/US IS Cl.I Div.1 Gr.A-D, Ex ia Zone 0,1,2 XA00626P CA
FMD72 CSA C/US XP Cl.I Div.1 Gr.A-D, Ex d [ia], Zone 0,1,2 XA00627P CB
FMD72 CSA C/US NI, Cl.I Div.2 Gr.A-D, Zone 2 XA00671P CC

Deltabar FMD71, FMD72
6 Endress+Hauser
Device Directive Documentation Option 1)
FMD72 FM C/US IS Cl.I Div.1 Gr.A-D, AEx ia, Zone 0,1,2 XA00624P FA
FMD72 FM C/US XP AIS Cl.I Div.1 Gr.A-D, Exd [ia] Zone 0,1,2 XA00625P FB
FMD72 FM C/US NI Cl.I Div.2 Gr.A-D, Zone 2 XA00669P FD
1) Product Configurator order code for "Approval"
The nameplate provides information on the Safety Instructions (XA) that are relevant for the
device.
Terms and abbreviations
Term/abbreviation Explanation
XA Document type "Safety Instructions"
KA Document type "Brief Operating Instructions"
BA Document type "Operating Instructions"
SD Document type "Special Documentation"
PN Nominal pressure
MWP The MWP (maximum working pressure) for the individual sensors depends on the lowest-rated
element, with regard to pressure, of the selected components, i.e. the process connection must be
taken into consideration in addition to the measuring cell. Also observe pressure-temperature
dependency. For the relevant standards and additional information, see the "Pressure specifications"
→  29 section.
The MWP can also be found on the nameplate.
OPL The OPL (over pressure limit = sensor overload limit) for the measuring device depends on the
lowest-rated element, with regard to pressure, of the selected components, i.e. the process
connection has to be taken into consideration in addition to the measuring cell. Also observe
pressure-temperature dependency. For the relevant standards and additional information, see the
"Pressure specifications"→  29 section.
LRL Lower range limit
URL Upper range limit
LRV Lower range value
URV Upper range value
TD Turn down
Set span and zero-based span.
½Lower range value (LRV) ½ < ½ Upper range
value (URV)½
Example with measuring cell
HP = 1 000 mbar (15 psi) and measuring cell
LP = 400 mbar (6 psi):
LRL = 400 mbar (6 psi):
• Lower range value (LRV) =
–300 mbar (–4.35 psi)
• Upper range value (URV) = 0 mbar
• Nominal value (URL) = 1 000 mbar (15 psi)
Turn down:
TD = URL + ½LRL½/½ URV - LRV ½ 4.66:1
Set span:
URV – LRV = 300 mbar (4.35 psi)
This span is based on the zero point.
LRV URLURV LRL
1 = 2
3
4
5
A0016451
1 Set span
2 Zero-based span
3 Nominal value upper range limit (URL)
4 Nominal measuring range
5 Sensor measuring range
Registered trademarks HARTâ
Registered trademark of the HART Communication Foundation, Austin, USA

Deltabar FMD71, FMD72
Endress+Hauser 7
Function and system design
Measuring principle -
electronic differential
pressure measurement
Devices with ceramic process isolating diaphragm (Ceraphire®)
The ceramic sensor is an oil-free sensor, i.e. the process pressure acts directly on the robust ceramic
process isolating diaphragm and causes it to deflect. A pressure-dependent change in capacitance is
measured at the electrodes of the ceramic substrate and the process isolating diaphragm. The
measuring range is determined by the thickness of the ceramic process isolating diaphragm.
Advantages:
• Guaranteed overload resistance up to 40 times the nominal pressure
• The ultrapure 99.9 % ceramic (Ceraphire®, see also "www.endress.com/ceraphire") ensures:
– Extremely high chemical durability
– Less relaxation
– High mechanical durability
• Can be used in absolute vacuums up to 150 °C (302 °F)
• Small measuring ranges
1234
p
A0020465
1 Air pressure (relative pressure sensors)
2 Ceramic substrate
3 Electrodes
4 Ceramic process isolating diaphragm
Devices with metallic process isolating diaphragm
The process pressure deflects the metal process isolating diaphragm of the sensor and a fill fluid
transfers the pressure to a Wheatstone bridge (semiconductor technology). The pressure-dependent
change in the bridge output voltage is measured and evaluated.
Advantages:
• Can be used for process pressures up to 40 bar (600 psi)
• Fully welded process isolating diaphragm
• Small, flush-mounted process connections
• Significantly reduced thermal effect e.g. compared to diaphragm seal systems with capillaries
p
1
2
3
4
A0016448
1 Silicon measuring element, substrate
2 Wheatstone bridge
3 Channel with fill fluid
4 Metal process isolating diaphragm
Measuring system The FMD71/FMD72 consists of 2 sensor modules and one transmitter. One sensor module measures
the hydrostatic pressure (high pressure) and the other one the head pressure (low pressure). The
level (electronic differential pressure) is calculated in the transmitter using these two digital values.

Deltabar FMD71, FMD72
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Device features FMD71 FMD72
Field of
application
• Level
• Differential pressure
Process
connections
• Thread
• EN and ASME flanges
• Flush-mounted hygienic connections
• Thread
• EN and ASME flanges
• Flush-mounted hygienic connections
Measuring ranges
(differential
pressure)
from
–100 to +100 mbar (–1.5 to +1.5 psi)
to –1 to +40 bar (–15 to +600 psi)
from –400 to +400 mbar (–6 to +6 psi)
to –1 to +40 bar (–15 to +600 psi)
MWP 1) to 60 bar (900 psi) to 160 bar (2 400 psi)
Process
temperature
limits
Thread / flange connections:
–25 to +125 °C (–13 to +257 °F)/
150 °C (302 °F)
Hygienic connections:
–25 to +130 °C (–13 to +266 °F) ,
150 °C (302 °F) for max. 1 hour
Flush-mounted thread G 1 A, G 1½, G 2,
MNPT / flange connections:
–40 to +100 °C (–40 to +212 °F)/150 °C (302 °F)
Thread with internal process isolating
diaphragm: –40 to +125 °C (–40 to +257 °F)/
150 °C (302 °F)
Hygienic connections:
–40 to +130 °C (–40 to +266 °F) ,
150 °C (302 °F) for max. 1 hour
Higher process temperature limits available on
request (up to +250 °C (480 °F))
Ambient
temperature
range
–40 to +80 °C (–40 to +176 °F)
Reference
accuracy of the
individual sensors
• Up to ±0.075 % of the set span
• PLATINUM version: up to ±0.05 % of the set span
Supply voltage • Version for non-hazardous areas: 12 (13) to 45 V DC
• Ex ia: 12 (13) to 30 V DC
Output 4 to 20 mA with superimposed HART protocol
Options • NACE-compliant materials
• Software pre-configurations
1) MWP: depends on the lowest-rated element, with regard to pressure, of the selected components
Product design Level measurement (level, volume and mass) with Deltabar:

Deltabar FMD71, FMD72
Endress+Hauser 9
LP 1
HP
p1
p2
P = p2
LP
P = p1 + p2
HP
A0016449
LP Sensor module LP (low pressure)
HP Sensor module HP (high pressure)
p2 Head pressure
p1 Hydrostatic pressure
1 Transmitter
The FMD71/FMD72 is best suited to level measurement in vessels with pressure overlay or in
vacuum vessels and tanks, high distillation columns and other vessels with changing ambient
temperatures.
The sensor module HP is mounted on the lower measuring connection and the sensor module LP is
mounted above the maximum level. The transmitter can be mounted on pipes or walls with the
mounting bracket.
The sensor signal is transmitted digitally. In addition, sensor temperatures and the individual process
pressures present at the respective sensor modules can be individually evaluated and transmitted.
NOTICE
Incorrect sizing/order of sensor modules
‣In a closed system, please note that the sensor module is affected by the superimposed head
pressure (p2) in addition to the hydrostatic pressure (p1). This must be taken into account when
sizing the sensor module on the high-pressure side (HP).
System integration The device can be given a tag name (max. 8 alphanumeric characters).
Measuring point (TAG), see additional specifications.: Product Configurator order code for
"Identification", option "Z1"

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Input
Measured variable Measured process variables
• Pressure HP and Pressure LP
• Sensor temperature HP and sensor temperature LP
• Transmitter temperature
Calculated process variables
• Differential pressure
• Level (level, volume or mass)
FMD71: measuring range of
individual sensors
The maximum span of the differential pressure corresponds to the URL of the HP sensor.
Gauge pressure
Nominal value Range limit MWP OPL Vacuum resistance Option 1)
lower (LRL) upper (URL)
[bar (psi)] [bar (psi)] [bar (psi)] [bar (psi)] [barabs (psiabs)]
100 mbar (1.5 psi) –0.1 (–1.5) +0.1 (+1.5) 2.7 (40.5) 4 (60) 0.7 (10.5) 1C
250 mbar (4 psi) –0.25 (–4) +0.25 (+4) 3.3 (49.5) 5 (75) 0.5 (7.5) 1E
400 mbar (6 psi) –0.4 (–6) +0.4 (+6) 5.3 (79.5) 8 (120) 0 1F
1 bar (15 psi) –1 (–15) +1 (+15) 6.7 (100.5) 10 (150) 0 1H
2 bar (30 psi) –1 (–15) +2 ([phone] (270) 0 1K
4 bar (60 psi) –1 (–15) +4 (+60) 16.7 (250.5) 25 (375) 0 1M
10 bar (150 psi) –1 (–15) +10 (+150) 26.7 (400.5) 40 (600) 0 1P
40 bar (600 psi) –1 (–15) +40 (+600) 40 (600) 60 (900) 0 1S
1) Product Configurator order code for "Sensor range"
Absolute pressure
Nominal value Range limit MWP OPL Vacuum resistance Option 1)
lower (LRL) upper (URL)
[barabs (psiabs)] [barabs (psiabs)] [barabs (psiabs)] [barabs (psiabs)] [barabs (psiabs)]
100 mbar (1.5 psi) 0 +0.1 (+1.5) 2.7 (40.5) 4 (60) 0 2C
250 mbar (4 psi) 0 +0.25 (+4) 3.3 (49.5) 5 (75) 0 2E
400 mbar (6 psi) 0 +0.4 (+6) 5.3 (79.5) 8 (120) 0 2F
1 bar (15 psi) 0 +1 (+15) 6.7 (100.5) 10 (150) 0 2H
2 bar (30 psi) 0 +2 ([phone] (270) 0 2K
4 bar (60 psi) 0 +4 (+60) 16.7 (250.5) 25 (375) 0 2M
10 bar (150 psi) 0 +10 (+150) 26.7 (400.5) 40 (600) 0 2P
40 bar (600 psi) 0 +40 (+600) 40 (600) 60 (900) 0 2S
1) Product Configurator order code for "Sensor range"

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Endress+Hauser 11
FMD72: measuring range of
individual sensors
The maximum span of the differential pressure corresponds to the URL of the HP sensor.
Gauge pressure
Nominal value Range limit MWP OPL Vacuum resistance 1) Option 2)
lower (LRL) upper (URL) Silicone oil
[bar (psi)] [bar (psi)] [bar (psi)] [bar (psi)] [barabs (psiabs)]
400 mbar (6 psi) –0.4 (–6) +0.4 (+6) 4 (60) 6 (90) 0.01 (0.15) 1F
1 bar (15 psi) –1 (–15) +1 (+15) 6.7 (100) 10 (150) 0.01 (0.15) 1H
2 bar (30 psi) –1 (–15) +2 (+30) 13.3 (200) 20 (300) 0.01 (0.15) 1K
4 bar (60 psi) –1 (–15) +4 (+60) 18.7 (280.5) 28 (420) 0.01 (0.15) 1M
10 bar (150 psi) –1 (–15) +10 (+150) 26.7 (400.5) 40 (600) 0.01 (0.15) 1P
40 bar (600 psi) –1 (–15) +40 (+600) 100 (1500) 160 (2400) 0.01 (0.15) 1S
1) The vacuum resistance applies for the measuring cell under reference operating conditions. (see "Reference operating conditions" section)
2) Product Configurator order code for "Sensor range"
Absolute pressure
Nominal value Range limit MWP OPL Vacuum resistance 1) Option 2)
lower (LRL) upper (URL) Silicone oil
[barabs (psiabs)] [barabs (psiabs)] [barabs (psiabs)] [barabs (psiabs)] [barabs (psiabs)]
1 bar (15 psi) 0 +1 (+15) 6.7 (100) 10 (150) 0.01 (0.15) 2H
2 bar (30 psi) 0 +2 (+30) 13.3 (200) 20 (300) 0.01 (0.15) 2K
4 bar (60 psi) 0 +4 (+60) 18.7 (280.5) 28 (420) 0.01 (0.15) 2M
10 bar (150 psi) 0 +10 (+150) 26.7 (400.5) 40 (600) 0.01 (0.15) 2P
40 bar (600 psi) –1 (–15) +40 (+600) 100 (1500) 160 (2400) 0.01 (0.15) 2S
1) The vacuum resistance applies for the measuring cell under reference operating conditions. (see "Reference operating conditions" section)
2) Product Configurator order code for "Sensor range"

Deltabar FMD71, FMD72
12 Endress+Hauser
Output
Output signal 4 to 20 mA with superimposed digital communication protocol HART 6.0, 2-wire
Operation Internal + LCD External 1) + LCD Internal
on on
off off
damp. damp.
Display Display
Sensor Sensor
HART HAR T
R R
FIELDCOMMUNICATI ON PROTOCOL FIELDCOMMUNICATI ON PROTOCOL
SW /min SW /min
E
+
–
E
+
–
A0021280
Order code option 2) 4 5 8
1) In the case of the T17 transmitter housing, the operating keys are always arranged internally on the electronic insert.
2) Product Configurator order code for "Display, operation:"
Signal range 4 to 20 mA 3.8 mA to 20.5 mA
Signal on alarm 4 to 20 mA As per NAMUR NE43
• High alarm (factory setting: 22 mA): can be set from 21 to 23 mA
• Hold measured value: last measured value is held
• Min. alarm: 3.6 mA
Maximum load In order to guarantee sufficient terminal voltage in two-wire devices, a maximum load resistance R
(including line resistance) must not be exceeded depending on the supply voltage U0 of the supply
unit. In the following load diagrams, observe the position of the jumper and the explosion protection:
U – 12 V U – 13 V
RLmax 23 mA 23 mA
£
30
20
12 U
[V]
40 45
1217
1435
783
348
[ ]W[ ]W
RLmax RLmax
30
20
13 40 45
1174
1391
739
304
Test
Test
£
3
A B
1
3
2
1
2
RLmax
U
[V]
A0017533
A Jumper for 4 to 20 mA test signal set to "Non-test" position
B Jumper for 4 to 20 mA test signal set to "Test" position
1 Power supply for II 1/2 G Ex ia, FM IS, CSA IS
2 Power supply for devices for the non-hazardous area, 2 G Ex d, 3 G Ex nA, FM XP, FM NI, CSA XP, CSA dust
ignition-proof
3 RLmax maximum load resistance
U Supply voltage
When operating via a handheld terminal or via a PC with an operating program, a minimum
communication resistance of 250 Ω must be taken into account.

Deltabar FMD71, FMD72
Endress+Hauser 13
Dead time, time constant Presentation of the dead time and the time constant:
I
63 %
100 %
t
t1t2
90 %
t3
A0019786
Dynamic behavior,
current output Dead time (t1) [ms] Time constant (T63), t2Time constant (T90), t3
max. 120 120 280
Dynamic behavior, HART Dead time (t1) [ms] Dead time (t1) [ms] +
Time constant T63 (= t2) [ms]
Dead time (t1) [ms] +
Time constant T90 (= t3) [ms]
min. 280 400 560
max. 1100 1220 1380
Reading cycle
• Acyclic: max. 3/s, typically 1/s (depending on command # and number of preambles)
• Cyclic (burst): max. 3/s, typically 2/s
The Deltabar FMD71/FMD72 offers BURST MODE functionality for cyclical value transmission via
the HART communication protocol.
Cycle time (update time)
Cyclic (burst): min. 300 ms
Response time
• Acyclic: min. 330 ms, typically 590 ms (depending on command # and number of preambles)
• Cyclic (burst): min. 160 ms, typically 350 ms (depending on command # and number of
preambles)
Damping A damping affects all outputs (output signal, display):
• Via onsite display, handheld terminal or PC with operating program, continuous from 0 to 999 s
• Via DIP switch on the electronic insert, switch position "on" = set value and "off"
• Factory setting: 2 s
Damping can be switched on or off using a switch on the electronic insert. If the switch is on, the
time constant can be set via a parameter in the menu and if the switch is off, the output signal is not
damped (time constant = 0.0).
alarm current Configured min. alarm current: Product configurator order code for "Service", option "IA"
Firmware Version Description Option 1)
01.00.zz, HART, DevRev01 78
1) Product Configurator order code for "Firmware version"

Deltabar FMD71, FMD72
14 Endress+Hauser
Protocol-specific data Manufacturer ID 17 (0x11)
Device type code 39 (0x27)
HART specification 6.0
Device description files (DTM, DD) Information and files under:
•www.endress.com
•www.hartcomm.org
HART device variables Measured values for PV (primary variable)
• Differential pressure
• Level linear (before lin.)
• Level after linearization table
Measured values for SV, TV, QV (second, third and fourth variable)
• Measured differential pressure
• Corrected pressure
• Measured pressure HP
• Sensor pressure HP
• Sensor temperature HP
• Measured pressure LP
• Sensor pressure LP
• Sensor temperature LP
• Level before linearization
• Tank content
• Electronics temperature
Supported functions • Burst mode
• Additional transmitter status

Deltabar FMD71, FMD72
Endress+Hauser 15
Power supply
LWARNING
Electrical safety is compromised by an incorrect connection!
‣In accordance with IEC/EN61010 a separate circuit breaker must be provided for the device .
‣When using the measuring device in a hazardous area, installation must also comply with the
relevant national standards and regulations as well as the safety instructions or installation or
control drawings.
‣All explosion protection data are given in separate documentation which is available upon
request. The Ex documentation is supplied as standard with all devices approved for use in
explosion hazardous areas.
‣Devices with integrated overvoltage protection must be grounded.
‣Protective circuits against reverse polarity, HF influences and overvoltage peaks are integrated.
Terminal assignment
4... 20mA Test
Test
Test
4... 20mA Test
1
8
6
7
2
3
4
5
A0019989
1 Housing
2 Supply voltage
3 4 to 20 mA
4 Devices with integrated overvoltage protection are labeled "OVP" (overvoltage protection) here.
5 External ground terminal
6 4 to 20 mA test signal between positive and test terminal
7 Internal ground terminal, minimum supply voltage = 12 V DC, jumper is set as illustrated in the diagram.
8 Jumper for 4 to 20 mA test signal,
Supply voltage Electronic version Jumper for 4 to 20 mA test signal in
"Test" position (delivery status)
Jumper for 4 to 20 mA test signal
in "Non-test" position
4 to 20 mA HART, version for
non-hazardous areas
13 to 45 V DC 12 to 45 V DC
Measuring a 4 to 20 mA test signal
A 4 to 20 mA test signal may be measured via the positive and test terminal without interrupting
the measurement. The minimum supply voltage of the device can be reduced by simply changing the
position of the jumper. As a result, operation is also possible with a lower supply voltage. To keep the
measured error below 0.1 %, the current measuring device should exhibit an internal resistance of
<0.7Ω. Observe the position of the jumper in accordance with the following table.

Deltabar FMD71, FMD72
16 Endress+Hauser
Jumper position for test
signal
Description
Test
A0019992
• Measurement of 4 to 20 mA test signal via the positive and test terminal:
possible. (Thus, the output current can be measured without interruption via
the diode.)
• Delivery status
• Minimum supply voltage: 13 V DC
Test
A0019993
• Measurement of 4 to 20 mA test signal via positive and test terminal: not
possible.
• Minimum supply voltage: 12 V DC
Cable entries Explosion protection Cable gland Permitted cable diameter Permitted wire cross-sections
• Standard
• Ex ia
• Ex ic
Plastic M20x1.5 5 to 10 mm (0.2 to 0.39 in) 0.5 to 2.5 mm2 (20 to 14 AWG)
• Ex tD
• Ex nA
• FM approval
• CSA approval
Metal M20 x 1.5 7 to 10.5 mm (0.28 to 0.41 in)
Cable specification for
transmitter connection
• Endress+Hauser recommends using twisted, shielded two-wire cables.
• Terminals for core cross-sections 0.5 to 2.5 mm2 (20 to 14 AWG)
• The cable outer diameter depends on the cable entry used.
Residual ripple Without influence on 4 to 20 mA signal up to ±5 % residual ripple within the permitted voltage
range [according to HART hardware specification HCF_SPEC-54 (DIN IEC 60381-1)]
Influence of power supply ≤0.0006 % of URL/1 V
Overvoltage protection Standard version
The standard version of the pressure instruments does not contain any special elements to protect
against overvoltage ("wire to ground"). Nevertheless the requirements of the applicable EMC
standard EN 61000-4-5 (testing voltage 1kV EMC wire/ground) are met.
Optional overvoltage protection
Devices showing version "NA" in feature 610 "Accessory Mounted" in the order code are equipped
with overvoltage protection.
• Overvoltage protection:
– Nominal functioning DC voltage: 600 V
– Nominal discharge current: 10 kA
• Surge current check î = 20 kA satisfied as per DIN EN 60079-14: 8/20 μs
• Arrester AC current check I = 10 A satisfied
NOTICE
Device could be destroyed!
‣Devices with integrated overvoltage protection must be grounded.

Deltabar FMD71, FMD72
Endress+Hauser 17
Performance characteristics of ceramic process isolating
diaphragm
Reference operating
conditions
• As per IEC 60770
• Ambient temperature TU = constant, in the range of +21 to +33 °C (+70 to +91 °F)
•Humidityj= constant, in the range of 5 to 80 % rH
• Ambient pressure pA = constant, in the range of860 to 1 060 mbar (12.47 to 15.37 psi)
• Position of the measuring cell = constant, in the range of horizontal ±1° (see also "Influence of the
installation position" section →  17)
• Input of Lo Trim Sensor and Hi Trim Sensor for lower range value and upper range value
• Zero based span
• Material of process isolating diaphragm: Al2O3 (aluminum-oxide ceramic, Ceraphire®)
• Supply voltage: 24 V DC ±3 V DC
• Load with HART: 250 Ω
Influence of the installation
position depending on sensor
90°
90°
C
A
B
A0016465
Process isolating diaphragm axis is horizontal (A) Process isolating diaphragm pointing
upwards (B)
Process isolating diaphragm pointing
downwards (C)
Calibration position, no measurement error < +0.2 mbar (+0.003 psi) < –0.2 mbar (–0.003 psi)
This effect can be corrected using the function to adjust the position (position adjustment) for the
differential pressure. Additional position adjustments for individual pressure signals are not
available.
A position-dependent zero shift can be corrected on the device .
Resolution • Current output: 1 μA
• Display: can be set (factory setting: presentation of the maximum accuracy of the transmitter)
Vibration effects Test standard Vibration effects
IEC 61298-3 ≤ Reference accuracy up to 10 to 60 Hz: ±0.35 mm (±0.01 in); 60 to 500 Hz: 2 g
Application limits A high ratio between the level and head pressure or between the differential pressure and static
pressure can result in large measured errors. A maximum ratio of 1:10 is recommended. For
calculation purposes, please use the free "Applicator" calculation tool, which is available online at
"www.endress.com/applicator" or on CD-ROM.

Deltabar FMD71, FMD72
18 Endress+Hauser
Reference accuracy The reference accuracy contains the non-linearity [DIN EN 61298-2 3.11] including the pressure
hysteresis [DIN EN 61298-23.13] and non-repeatability [DIN EN 61298-2 3.11] in accordance with
the limit point method as per [DIN EN 60770].
Measuring cell Sensor Reference accuracy (A)
[%URL for every sensor]
Calculated reference accuracy (ADiff)
of the differential pressure
Standard Platinum
100 mbar (1.5 psi) Gauge pressure A =
A =
±0.075
±0.15 1) - Calculation (mbar, bar or psi):
ADiff HP HP
2
(A URL ) += .LP LP
2
(A URL )
.
100 100
A0016468
Percentage calculation of URL dP:
A [%] P
100
.
Diff
Diff
=ADiff
A0016469
250 mbar (3.75 psi) Gauge pressure A =
A =
±0.075
±0.15 1) -
400 mbar (6 psi) Gauge pressure A =
A =
±0.075
±0.15 1) -
1 bar (15 psi)
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
40 bar (600 psi)
Gauge pressure/ Absolute pressure A =
A =
±0.075
±0.15 1) A = ±0.05 ±0.075 1)
1) For hygienic process connections
Ordering information
Description Option 1)
Platinum D
Standard G
1) Product Configurator order code for "Reference accuracy"
Thermal change of the zero
output and the output span Standard version
Measuring cell –10 to +60 °C (+14 to +140 °F) –20 to –10 °C (–4 to +14 °F)
+60 to +125 °C (+140 to +257 °F)
Calculated thermal change (TDiff)
of the differential pressure
% of the set span for every sensor
100 mbar (1.5 psi)
250 mbar (4 psi)
400 mbar (6 psi)
Ttotal = ±0.176 Ttotal = ±0.276 Calculation (mbar, bar or psi):
TDiff HP HP
2
(T URL ) += .LP LP
2
(T URL )
.
100 100
A0016474
Percentage calculation of URL dP:
T [%] P
100
.
Diff Diff
=TDiff
A0016475
1 bar (15 psi)
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
40 bar (600 psi)
Ttotal = ±0.092 Ttotal = ±0.250

Deltabar FMD71, FMD72
Endress+Hauser 19
High temperature version and hygienic version
Measuring cell Sensor –10 to +60 °C
(+14 to +140 °F)
+60 to +150 °C
(140 to +302 °F)
Calculated thermal change (TDiff)
of the differential pressure
% of the set span for every sensor
100 mbar (1.5 psi)
250 mbar (4 psi)
400 mbar (6 psi)
Gauge
pressure
Ttotal = ±0.176
TTotal = ±0.352 1) T = ±0.75 T = ±1.25 1) Calculation (mbar, bar or psi):
TDiff HP HP
2
(T URL ) += .LP LP
2
(T URL )
.
100 100
A0016474
Percentage calculation of URL dP:
T [%] P
100
.
Diff Diff
=TDiff
A0016475
1 bar (15 psi)
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
40 bar (600 psi)
Gauge
pressure
Ttotal = ±0.092
Ttotal = ±0.184 1) T = ±0.5 T = ±0.75 1)
1 bar (15 psi)
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
Absolute
pressure
Ttotal = ±0.092
Ttotal = ±0.184 1) T = ±0.75 T = ±1.25 1)
40 bar (600 psi) Absolute
pressure
Ttotal = ±0.092
Ttotal = ±0.184 1) T = ±0.5 T = ±0.75 1)
1) For hygienic process connections
Total performance The "Total performance" specification comprises the non-linearity including hysteresis, non-
reproducibility as well as the thermal change of the zero point. All specifications apply to the
temperature range –10 to +60 °C (+14 to +140 °F).
Measuring cell % of URL for every
sensor - standard
version
% of URL for every
sensor - high-
temperature version
% of URL for every
sensor - hygienic
version
Calculated total performance (TPDiff)
of the differential pressure
100 mbar (1.5 psi)
250 mbar (4 psi)
400 mbar (6 psi)
TP = ±0.2 TP = ±0.46 TP = ±0.575 Calculation (mbar, bar or psi):
TP
Diff HP HP
2
(TP URL ) += .LP LP
2
(TP URL )
.
100 100
A0016470
Percentage calculation of URL dP:
TP [%] P
100
.
Diff
Diff
=TP
Diff
A0016471
1 bar (15 psi)
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
40 bar (600 psi)
TP = ±0.15 TP = ±0.46 TP = ±0.5
The "Applicator Sizing Electronic dp" selection tool, available free of charge on the Endress
+Hauser web site (www.endress. com/applicator), enables detailed calculations for your
respective applications.
Long-term stability '
Measuring ranges Sensor Standard version Calculated long-term stability (LDiff)
of the differential pressure
1 year 10 years
% of URL for every sensor
100 mbar (1.5 psi)
250 mbar (4 psi)
400 mbar (6 psi)
Gauge pressure L = ±0.1
L = ±0.25 1) L = ±0.2 L = ±0.45 1) Calculation (mbar, bar or psi):
LDiff HP HP
2
(L
100 100
URL ) +=.LP LP
2
(L URL )
.
A0016463
Percentage calculation of URL dP/year:
Absolute pressure L = ±0.3
L = ±0.55 1)

Deltabar FMD71, FMD72
20 Endress+Hauser
Measuring ranges Sensor Standard version Calculated long-term stability (LDiff)
of the differential pressure
1 year 10 years
% of URL for every sensor
1 bar (15 psi)
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
40 bar (600 psi)
Gauge pressure L = ±0.05
L = ±0.1 1) L = ±0.2
L [%] P
100
.
Diff Diff
=LDiff
A0016464
Absolute pressure L = ±0.3
1) For hygienic process connections
Total error The total error comprises the total performance and long-term stability. All specifications apply to
the temperature range –10 to +60 °C (+14 to +140 °F).
Measuring cell % of URL for every
sensor - standard
version
% of URL for every
sensor - high-
temperature version
% of URL for every
sensor - hygienic
version
Calculated total error (TEDiff)
of the differential pressure
100 mbar (1.5 psi)
250 mbar (4 psi)
400 mbar (6 psi)
TE = ±0.25 TE = ±0.51 TE = ±0.925 Calculation (mbar, bar or psi):
TEDiff HP HP
2
(TE URL ) += .LP LP
2
(TE URL )
.
100 100
A0016472
Percentage calculation of URL dP:
TE [%] P
100
.
Diff
Diff
=TEDiff
A0016473
1 bar (15 psi)
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
40 bar (600 psi)
TE = ±0.2 TE = ±0.51 TE = ±0.7
Warm-up period 4 to 20 mA HART : < 10 s