Endress+Hauser Deltabar S FMD76 User manual

BA00294P/00/EN/13.11
71139764
valid from Software version:
04.00.zz
Operating Instructions
Deltabar S FMD76/77/78, PMD70/75
Differential pressure measurement

Overview documentation Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
2Endress+Hauser
Overview documentation
Device Documentation Content Remarks
Deltabar S PROFIBUS PA Technical Information TI00382P Technical data – The documentation can be found on the
supplied documentation CD.
– The documentation is also available via the
Internet. → See: www.endress.com
Operating Instructions BA00294P – Identification
– Installation
– Wiring
– Operation
– Commissioning, Description of
Quick Setup menus
– Maintenance
– Trouble-shooting and spare parts
– Appendix: Illustration of menu
Operating Instructions BA00296P – Examples of configuration for
pressure, level and flow
measurement
– Description of parameters
– Trouble-shooting
– Appendix: Illustration of menu
Brief Operating Instructions KA01021P – Installation
– Wiring
– Operation on-site
– Commissioning
– Description of Quick Setup menus
– The documentation is supplied with the
device.
– The documentation can be found on the
supplied documentation CD.
– The documentation is also available via the
Internet. → See: www.endress.com
Leporello KA00244P – Wiring
– Description of operating elements
– Operation HistoROM®/M-DAT
– The documentation is supplied with the
device. See cover of the terminal
compartment.
– The documentation can also be found on the
supplied documentation CD.

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Table of contents
Endress+Hauser 3
Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . . . . . . . . 4
1.3 Operational safety and process safety . . . . . . . . . . . . 4
1.4 Notes on safety conventions and icons . . . . . . . . . . . 5
2 Identification . . . . . . . . . . . . . . . . . . . . 6
2.1 Device designation . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 CE mark, declaration of conformity . . . . . . . . . . . . . 9
2.4 Registered trademarks . . . . . . . . . . . . . . . . . . . . . . . 9
3 Installation . . . . . . . . . . . . . . . . . . . . . 10
3.1 Incoming acceptance and storage . . . . . . . . . . . . . . 10
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . . 10
3.4 Post-installation check . . . . . . . . . . . . . . . . . . . . . . 22
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . 23
4.1 Connecting the device . . . . . . . . . . . . . . . . . . . . . . 23
4.2 Connecting the measuring unit . . . . . . . . . . . . . . . 24
4.3 Post-connection check . . . . . . . . . . . . . . . . . . . . . . 25
5 Operation . . . . . . . . . . . . . . . . . . . . . . 26
5.1 On-site display (optional) . . . . . . . . . . . . . . . . . . . . 26
5.2 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3 PROFIBUS PA communication protocol . . . . . . . . . 31
5.4 On-site operation –
on-site display connected . . . . . . . . . . . . . . . . . . . . 44
5.5 FieldCare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.6 HistoROM®/M-DAT (optional) . . . . . . . . . . . . . . 47
5.7 Locking/unlocking operation . . . . . . . . . . . . . . . . . 50
5.8 Configuring the device address . . . . . . . . . . . . . . . 51
5.9 Factory setting (reset) . . . . . . . . . . . . . . . . . . . . . . 52
6 Commissioning. . . . . . . . . . . . . . . . . . 54
6.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.2 Commissioning via Class 2 master (FieldCare) . . . . 55
6.3 Selecting language and measuring mode . . . . . . . . 55
6.4 Position adjustment . . . . . . . . . . . . . . . . . . . . . . . . 57
6.5 Flow measurement . . . . . . . . . . . . . . . . . . . . . . . . 58
6.6 Level measurement . . . . . . . . . . . . . . . . . . . . . . . . 61
6.7 Differential pressure measurement . . . . . . . . . . . . . 68
6.8 Scaling OUT value . . . . . . . . . . . . . . . . . . . . . . . . 70
6.9 System units (SET UNIT TO BUS) . . . . . . . . . . . . . 71
6.10 System integration . . . . . . . . . . . . . . . . . . . . . . . . . 72
7 Maintenance. . . . . . . . . . . . . . . . . . . . 74
7.1 Exterior cleaning . . . . . . . . . . . . . . . . . . . . . . . . . 74
8 Trouble-shooting . . . . . . . . . . . . . . . . . 75
8.1 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
8.2 Response of outputs to errors . . . . . . . . . . . . . . . . . 82
8.3 Confirming messages . . . . . . . . . . . . . . . . . . . . . . . 83
8.4 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
8.5 Repair of Ex-certified devices . . . . . . . . . . . . . . . . . 84
8.6 Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
8.7 Returning the device . . . . . . . . . . . . . . . . . . . . . . . 86
8.8 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
8.9 Software history . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
8.10 Hardware history . . . . . . . . . . . . . . . . . . . . . . . . . . 86
9 Technical data . . . . . . . . . . . . . . . . . . . 87
10 Appendix. . . . . . . . . . . . . . . . . . . . . . . 87
10.1 Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
10.2 Patents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Safety instructions Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
4Endress+Hauser
1 Safety instructions
1.1 Designated use
The Deltabar S is a differential pressure transmitter for measuring differential pressure, flow and
level.
The manufacturer accepts no liability for damages resulting from incorrect use or use other than that
designated.
1.2 Installation, commissioning and operation
The device has been designed to operate safely in accordance with current technical, safety and EU
standards. If installed incorrectly or used for applications for which it is not intended, however, it is
possible that application-related dangers may arise, e.g. product overflow due to incorrect
installation or calibration. For this reason, the instrument must be installed, connected, operated
and maintained according to the instructions in this manual: personnel must be authorised and
suitably qualified. The manual must have been read and understood, and the instructions followed.
Modifications and repairs to the device are permissible only when they are expressly approved in
the manual. Pay particular attention to the technical data on the nameplate.
1.3 Operational safety and process safety
Alternative monitoring measures must be taken to ensure operational safety and process safety
during configuration, testing and maintenance work on the device.
1.3.1 Hazardous areas (optional)
Devices for use in hazardous areas are fitted with an additional nameplate (→ see Page 6). If the
device is to be installed in an explosion hazardous area, then the specifications in the certificate as
well as all national and local regulations must be observed. The device is accompanied by separate
"Ex documentation", which is an integral part of this Operating Instructions. The installation
regulations, connection values and Safety Instructions listed in this Ex documentation must be
observed. The documentation number of the related Safety Instructions is also indicated on the
additional nameplate.
• Ensure that all personnel are suitably qualified.

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Safety instructions
Endress+Hauser 5
1.4 Notes on safety conventions and icons
In order to highlight safety-relevant or alternative operating procedures in the manual, the following
conventions have been used, each indicated by a corresponding icon in the margin.
Safety conventions
#Warning!
A warning highlights actions or procedures which, if not performed correctly, will lead to personal
injury, a safety hazard or destruction of the instrument.
"Caution!
Caution highlights actions or procedures which, if not performed correctly, may lead to personal
injury or incorrect functioning of the instrument.
!Note!
A note highlights actions or procedures which, if not performed correctly, may indirectly affect
operation or may lead to an instrument response which is not planned.
0Device certified for use in explosion hazardous area
If the device has this symbol embossed on its nameplate, it can be installed in an explosion
hazardous area or a non-explosion hazardous area, according to the approval.
-Explosion hazardous area
Symbol used in drawings to indicate explosion hazardous areas.
– Devices used in hazardous areas must possess an appropriate type of protection.
.
Safe area (non-explosion hazardous area)
Symbol used in drawings to indicate, if necessary, non-explosion hazardous areas.
– Devices used in hazardous areas must possess an appropriate type of protection. Lines used in
hazardous areas must meet the necessary safety-related characteristic quantities.
%Direct voltage
A terminal to which or from which a direct current or voltage may be applied or supplied.
&Alternating voltage
A terminal to which or from which an alternating (sine-wave) current or voltage may be applied
or supplied.
)Grounded terminal
A grounded terminal, which as far as the operator is concerned, is already grounded by means of
an earth grounding system.
*Protective grounding (earth) terminal
A terminal which must be connected to earth ground prior to making any other connection to the
equipment.
+Equipotential connection (earth bonding)
A connection made to the plant grounding system which may be of type e.g. neutral star or
equipotential line according to national or company practice.
Temperature resistance of the connection cables
States, that the connection cables must be resistant to a temperature of at least 85 °C (185 °F).
Safety instruction
For safety instructions refer to the manual for the appropriate instrument version.
t >85°C

Identification Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
6Endress+Hauser
2 Identification
2.1 Device designation
2.1.1 Nameplate
!Note!
• The MWP (maximum working pressure) is specified on the nameplate. This value refers to a
reference temperature of 20°C (68°F) or 100°F (38°C) for ANSI flanges.
• The pressure values permitted at higher temperatures can be found in the following standards:
– EN 1092-1: 2001 Tab. 18 1)
– ASME B 16.5a – 1998 Tab. 2-2.2 F316
– ASME B 16.5a – 1998 Tab. 2.3.8 N10276
– JIS B 2220
• For PMD70 and PMD75, the MWP applies for the temperature ranges specified in the Technical
Information TI00382P in the "Ambient temperature range" and "Process temperature limits"
sections.
• The test pressure corresponds to the over pressure limit (OPL) of the device = MWP x 1.5.
• The Pressure Equipment Directive (EC Directive 97/23/EC) uses the abbreviation "PS". The
abbreviation "PS" corresponds to the MWP (maximum working pressure) of the measuring
device.
Aluminium housing (T14/T15) and stainless steel housing (T14)
P01-XMX7Xxxx-18-xx-xx-xx-000
Fig. 1: Nameplate
1 Device name
2 Order code
See the specifications on the order confirmation for the meanings of the individual letters and digits.
3 Serial number
4 Degree of protection
5 MWP (Maximum working pressure)
6 Symbol: Note: pay particular attention to the data in the "Technical Information"!
7 Minimum/maximum span
8 Nominal measuring range
9 Electronic version (output signal)
10 Wetted materials
11 Supply voltage
12 GL-symbol for GL marine certificate (optional)
13 SIL-symbol for devices with SIL3/IEC 61508 Declaration of conformity (optional)
14 Approval ID and ID numbers
15 Address of manufacturer
1) With regard to their stability-temperature property, the materials 1.4435 and 1.4404 are grouped together under 13EO
in EN 1092-1 Tab. 18. The chemical composition of the two materials can be identical.
Mat.
MWP
Span
Ser.-No.:
Order Code:
U=
1
2
34
5
6
7
8
9
10
11
12 13
14
26
23,5
2,5
55
R1
2,1 -0,1
15

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Identification
Endress+Hauser 7
Devices for use in hazardous areas are fitted with an additional nameplate.
P01-xMD7xxxx-18-xx-xx-xx-002
Fig. 2: Additional nameplate for devices for hazardous areas
1 EC type examination certificate number
2 Type of protection e.g. II 1/2 G Ex ia IIC T4/T6
3 Electrical data
4 Safety Instructions number e.g. XA00235P
5 Safety Instructions index e.g. A
6 Device manufacture data
7 Installation in accordance with the FISCO model is possible for devices with Ex ia, CSA IS or FM IS
Devices suitable for oxygen applications are fitted with an additional nameplate.
P01-xxxxxxxx-18-xx-xx-xx-000
Fig. 3: Additional nameplate for devices suitable for oxygen applications
1 Maximum pressure for oxygen applications
2 Maximum temperature for oxygen applications
3 Layout identification of the nameplate
Dat.:
3
6
5
1
2
4
7
Pmax
Tmax
for oxygen service
Bei Sauerstoffeinsatz/
3
1
2

Identification Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
8Endress+Hauser
Hygenic stainless steel housing (T17)
P01-XMX7Xxxx-18-xx-xx-xx-001
Fig. 4: Nameplate
1 Device name
2 Address of manufacturer
3 Order code
See the specifications on the order confirmation for the meanings of the individual letters and digits.
4 Serial number
5 MWP (Maximum working pressure)
6 Symbol: Note: pay particular attention to the data in the "Technical Information"!
7 Minimum/Maximum span
8 Nominal measuring range
9 Electronic version (output signal)
10 Supply voltage
11 Wetted materials
12 Degree of protection
Optional:
13 Approval ID and ID numbers
14 3A-symbol
15 CSA-symbol
16 FM-symbol
17 SIL-symbol for devices with SIL3/IEC 61508 Declaration of conformity
18 GL-symbol for GL marine certificate
19 EC type examination certificate
20 Type of protection
21 Approval number for WHG overspill protection
22 Temperature operating range for devices for use in hazardous areas
23 Electrical data for devices for use in hazardous areas
24 Safety Instructions number
25 Safety Instructions index
26 Device manufacture data
27 Maximum temperature for devices suitable for oxygen applications
28 Maximum pressure for devices suitable for oxygen applications
2.1.2 Identifying the sensor type
See parameter "Sensor Meas.Type" in Operating Instruction BA00296P. The Operating Instruction
BA00296P can be found on the supplied documentation CD.
15 Pmax
Tmax
Bei Sauerstoffeinsatz/for oxygen service:
Order Code:
Ser.-No.:
MWP
Span
U=
Mat.
1
3
4
6
7
8
9 10
11
12
13
13
13
14
5
16 17
-
Dat.:
19
21
20
22
23
24 25
26
27 28
2
18

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Identification
Endress+Hauser 9
2.2 Scope of delivery
The scope of delivery comprises:
• Deltabar S differential pressure transmitter
• For PMD70 and PMD75 with side flanges made of AISI 316L or C22.8: additional 2 vent valves,
AISI 316L
• PMD75 with side flanges made of AISI 316L or C22.8 and side vent: additional 4 locking screws,
AISI 316L
• Operating program FieldCare with DTM
• Optional accessories
Documentation supplied:
• The Operating Instructions BA00294P and BA00296P, the Technical Information TI00382P and
the Safety Instructions and brochures can be found on the supplied documentation CD.
→ See also Page 2, "Overview documentation" chapter.
• Brief Operating Instructions KA01021P
• Leporello KA00244P
• Final inspection report
• Also Safety Instructions with ATEX, IECEx and NEPSI devices
• Optional: factory calibration form, test certificates
2.3 CE mark, declaration of conformity
The device is designed to meet state-of-the-art safety requirements, has been tested and left the
factory in a condition in which it is safe to operate. The device complies with the applicable
standards and regulations as listed in the EC declaration of conformity and thus complies with the
statutory requirements of the EC Directives. Endress+Hauser confirms the successful testing of the
device by affixing to it the CE mark.
2.4 Registered trademarks
KALREZ, VITON, TEFLON
Registered trademarks of E.I. Du Pont de Nemours & Co., Wilmington, USA
TRI-CLAMP
Registered trademark of Ladish & Co., Inc., Kenosha, USA
PROFIBUS
Registered trademark of the PROFIBUS Trade Organisation, Karlsruhe, D

Installation Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
10 Endress+Hauser
3 Installation
3.1 Incoming acceptance and storage
3.1.1 Incoming acceptance
• Check the packaging and the contents for damage.
• Check the shipment, make sure nothing is missing and that the scope of supply matches your
order.
3.1.2 Transport
"Caution!
Follow the safety instructions and transport conditions for devices of more than 18 kg (39.69 lbs).
Transport the measuring device to the measuring point in its original packaging or at the process
connection.
3.1.3 Storage
The device must be stored in a dry, clean area and protected against impact (EN 837-2).
Storage temperature range:
• –40...+90°C (–40 to +194°F)
• On-site display: –40 to +85°C (–40 to +185°F)
• Separate housing: –40 to +60°C (–40 to +140°F)
3.2 Installation conditions
3.2.1 Dimensions
→ For dimensions, please refer to the Technical Information for Deltabar S TI00382P, "Mechanical
construction" section. See Page 2, "Overview documentation".
3.3 Installation instructions
!Note!
• Due to the orientation of the Deltabar S, there may be a shift in the measured value, i.e. when
the container is empty, the measured value does not display zero. You can correct this zero point
shift either via the "zero" key on the electronic insert, or on the outside of the device or via the
on-site display. → See Page 28, Section 5.2.1 "Position of operating elements", Page 29, Section
5.2.2 "Function of operating elements – on-site display not connected" and Page 57, Section 6.4
"Position adjustment".
• For FMD77 and FMD78, please refer to Section 3.3.4. "Installation instructions for devices with
diaphragm seals", Page 17.
• General recommendations for routing the impulse piping can be found in DIN 19210 "Methods
for measurement of fluid flow; differential piping for flow measurement devices" or the
corresponding national or international standards.
• Using a three-valve or five-valve manifold allows for easy commissioning, installation and
maintenance without interrupting the process.
• When routing the impulse piping outdoors, ensure that sufficient anti-freeze protection is used,
e.g. by using pipe heat tracing.
• Install the impulse piping with a monotonic gradient of at least 10%.

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Installation
Endress+Hauser 11
• To ensure optimal readability of the on-site display, it is possible to rotate the housing up to 380°.
→ See Page 22, Section 3.3.9 "Rotating the housing".
• Endress+Hauser offers a mounting bracket for installing on pipes or walls. → See Page 20, Section
3.3.7 "Wall and pipe mounting".
3.3.1 Installation for flow measurement
!Note!
For more information about flow measurement with the Deltabar S differential pressure transmitter
• Deltabar S with orifice plate (TI00422P, Deltatop DO6x)
• Deltabar S with Pitot tube (TI00425P, Deltatop DP6x)
Flow measurement in gases with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-000
Fig. 5: Measuring layout for flow measurement in gases with PMD75
1 Deltabar S, here PMD75
2 Three-valve manifold
3 Shut-off valves
4 Orifice plate or pitot tube
• Mount the Deltabar S above the measuring point so that the condensate can run off into the
process piping.
Flow measurement in steam with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-001
Fig. 6: Measuring layout for flow measurement in steam with PMD75
1 Condensate traps
2 Orifice plate or pitot tube
3 Shut-off valves
4 Deltabar S, here PMD75
5Separator
6 Drain valves
7 Three-valve manifold
➀
➂
➃
+–
➁
➀
➁
➃
+–
➂
➅
➄
➆
➂
➅
➄

Installation Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
12 Endress+Hauser
• Mount the Deltabar S below the measuring point.
• Mount the condensate traps at the same level as the tapping points and at the same distance to
the Deltabar S.
• Prior to commissioning, fill the impulse piping to the height of the condensate traps.
Flow measurement in liquids with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-002
Fig. 7: Measuring layout for flow measurement in liquids with PMD75
1 Orifice plate or pitot tube
2 Shut-off valves
3 Deltabar S, here PMD75
4 Separator
5 Drain valves
6 Three-valve manifold
• Mount the Deltabar S below the measuring point so that the impulse piping is always filled with
liquid and gas bubbles can run back into the process piping.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
3.3.2 Installation for level measurement
Level measurement in an open container with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-003
Fig. 8: Measuring layout for level measurement in open containers with PMD75
1 The negative side is open to atmospheric pressure
2 Deltabar S, here PMD75
3 Shut-off valve
4 Separator
5 Drain valve
+–
➀
➂
➅
➁
➃
➄
➁
➃
➄
+
➃
➂
➀
➁
➄
patm
min. patm

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Installation
Endress+Hauser 13
• Mount the Deltabar S below the lower measuring connection so that the impulse piping is always
filled with liquid.
• The negative side is open to atmosphere pressure.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
Level measurement in an open container with FMD76/FMD77
P01-FMD76xxx-11-xx-xx-xx-003
Fig. 9: Measuring layout for level measurement in open containers with FMD76
1 Deltabar S, here FMD76
2 The negative side is open to atmospheric pressure
• Mount the Deltabar S direct on the container. →See also Page 19, Section 3.3.5 "Seal for flange
mounting".
• The negative side is open to atmosphere pressure.
Level measurement in a closed container with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-004
Fig. 10: Measuring layout for level measurement in a closed container with PMD75
1 Shut-off valves
2 Deltabar S, PMD75
3Separator
4 Drain valves
5 Three-valve manifold
• Mount the Deltabar S below the lower measuring connection so that the impulse piping is always
filled with liquid.
• Always connect the impulse piping of negative side above the maximum level.
➁
+
–
min. ➀
patm
patm
+
–➀
➂
➃
➄
➁
➀
➂
➃
min.
max.

Installation Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
14 Endress+Hauser
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
Level measurement in a closed container with FMD76/FMD77
P01-FMD76xxx-11-xx-xx-xx-004
Fig. 11: Measuring layout for level measurement in a closed container with FMD76
1 Shut-off valve
2 Separator
3 Drain valve
4 Deltabar S, here FMD76
• Mount the Deltabar S direct on the container. →See also Page 19, Section 3.3.5 "Seal for flange
mounting".
• Always connect the impulse piping of negative side above the maximum level.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
Level measurement in a closed container with FMD78
P01-FMD78xxx-11-xx-xx-xx-000
Fig. 12: Measuring layout for level measurement in a closed container with FMD78
1 Deltabar S, here FMD78
• Mount the Deltabar S below the lower diaphragm seal. → See also Page 17, Section 3.3.4
"Installation instructions for devices with diaphragm seals".
• The ambient temperature should be the same for both capillaries.
!Note!
Level measurement is only ensured between the upper edge of the lower diaphragm seal and the
lower edge of the upper diaphragm seal.
+
–
➃➂
➀
➁
max.
min.
+
–
➀
min.
max.

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Installation
Endress+Hauser 15
Level measurement in a closed container with superimposed steam with PMD 70/
PMD75
P01-PMD75xxx-11-xx-xx-xx-005
Fig. 13: Measuring layout for level measurement in a container with superimposed steam with PMD75
1 Condensate trap
2 Shut-off valves
3 Deltabar S, here PMD75
4Separator
5 Drain valves
6 Three-valve manifold
• Mount the Deltabar S below the lower measuring connection so that the impulse piping is always
filled with liquid.
• Always connect the impulse piping of negative side above the maximum level.
• A condensate trap ensures constant pressure on the negative side.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
Level measurement in a closed container with superimposed steam with FMD 76/
FMD77
P01-FMD76xxx-11-xx-xx-xx-005
Fig. 14: Measuring layout for level measurement in a container with superimposed steam with FMD76
1 Condensate trap
2 Shut-off valve
3Separator
4 Drain valve
5 Deltabar S, here FMD76
+
–
➂
➀
➁
➃
➄
➅
➃
➄
min.
max.
➁
+
–
➃
➂
➀
➁
➄
min.
max.

Installation Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
16 Endress+Hauser
• Mount the Deltabar S direct on the container. →See also Page 19, Section 3.3.5 "Seal for flange
mounting".
• Always connect the impulse piping of negative side above the maximum level.
• A condensate trap ensures constant pressure on the negative side.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
3.3.3 Installation for differential pressure measurement
Differential pressure measurement in gases and steam with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-006
Fig. 15: Measuring layout for differential pressure measurement in gases and steam with PMD75
1 Deltabar S, here PMD75
2 Three-valve manifold
3 Shut-off valves
4 e.g. filter
• Mount the Deltabar S above the measuring point so that the condensate can run off into the
process piping.
Differential pressure measurement in liquids with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-007
Fig. 16: Measuring layout for differential pressure measurement in liquids with PMD75
1 e.g. filter
2 Shut-off valves
3 Deltabar S, here PMD75
4 Separator
5 Drain valves
6 Three-valve manifold
• Mount the Deltabar S below the measuring point so that the impulse piping is always filled with
liquid and gas bubbles can run back into the process piping.
+
➂
➀
➁
➂
➃
+–
➂
➅
➁➁
➄
➃
➄
➃
➀

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Installation
Endress+Hauser 17
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
Differential pressure measurement in gases, steam and liquids with FMD78
P01-FMD78xxx-11-xx-xx-xx-000
Fig. 17: Measuring layout for differential pressure measurement in gases, steam and liquids with FMD78
1 Diaphragm seal
2 Capillary
3 e.g. filter
4 Deltabar S, here FMD78
• Mount the diaphragm seal with capillaries at the top or on the side on the piping.
• For vacuum applications: mount the Deltabar S below the measuring point. →See Page 17,
Section 3.3.4 "Installation instructions for devices with diaphragm seals", "Vacuum application"
part.
• The ambient temperature should be the same for both capillaries.
3.3.4 Installation instructions for devices with diaphragm seals
(FMD78)
!Note!
• The diaphragm seal, together with the pressure transmitter, forms a closed, calibrated system,
which is filled through openings in the diaphragm seal and in the measurement system of the
pressure transmitter. This openings are sealed and must not be opened.
• Do not clean or touch diaphragm seals with hard or pointed objects.
• Do not remove the protection of the isolating process diaphragm until shortly before installation.
• When using a mounting bracket, sufficient strain relief must be ensured for the capillaries in order
to prevent the capillary bending down (bending radius ≥ 100 mm (3.94 in)).
• Please note that the hydrostatic pressure of the liquid columns in the capillaries can cause zero
point shift. The zero point shift can be corrected. →See also Page 57, Section 6.4 "Position
adjustment".
• Please note the application limits of the diaphragm seal filling oil as detailed in the Technical
Information for Deltabar S TI00382P, section "Planning instructions for diaphragm seal systems".
→ See also Page 2, "Overview documentation".
In order to obtain more precise measurement results and to avoid a defect in the device, mount the
capillaries as follows:
• vibration-free (in order to avoid additional pressure fluctuations)
• not in the vicinity of heating or cooling lines
• insulate if the ambient temperature is below ore above the reference temperature
• with a bending radius of ≥100 mm (3.94 in).
• The ambient temperature and length of both capillaries should be the same when using two-sided
diaphragm seal systems.
• Two diaphragm seals which are the same (e.g. with regard to diameter, material, etc.) should
always be used for the negative and positive side (standard delivery).
+–
➂
➁
➃
➀
➁

Installation Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
18 Endress+Hauser
P01-FMD78xxx-11-xx-xx-xx-005
Fig. 18: Mounting Deltabar S, FMD78 with diaphragm seals and capillary, recommended mounting for vacuum
applications: mount pressure transmitter below the lowest diaphragm seal!
Vacuum application (FMD78)
For applications under vacuum, Endress+Hauser recommends mounting the pressure transmitter
underneath the lower diaphragm seal. A vacuum load of the diaphragm seal caused by the presence
of filling oil in the capillaries is hereby prevented.
When the pressure transmitter is mounted above the lower diaphragm seal, the maximum height
difference H1 in accordance with the illustration below on the left must not be exceeded. The
maximum height difference is dependent on the density of the filling oil and the smallest ever
pressure that is permitted to occur at the diaphragm seal on the positive side (empty container), see
illustration below, on the right.
+ –
+
–
≥100 mm
P01-FMD7xxxx-11-xx-xx-xx-001
Fig. 19: Installation above the lower
diaphragm seal
P01-FMD78xxx-05-xx-xx-xx-017
Fig. 20: Diagram of maximum installation height above the lower
diaphragm seal for vacuum applications dependent on
the pressure at the diaphragm seal on the positive side
+ –
+
–
H1
–+
0.0
2.0
4.0
6.0
8.0
10.0
12.0
50 100 300 400 500 600 700 800 900 1000
200
Inert oil
High temperature
oil
Vegetable oil
Silicone oil
Pressure, diaphragm seal positive side [mbarabs]
Height difference H1 [m]
Low temperature oil

Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA Installation
Endress+Hauser 19
3.3.5 Seal for flange mounting
P01-FMD7xxxx-11-xx-xx-xx-002
Fig. 21: Mounting the versions with flange or diaphragm seal
1 Process isolating diaphragm
2Seal
#Warning!
The seal is not allowed to press on the process isolating diaphragm as this could affect the
measurement result.
3.3.6 Heat insulation – FMD77
The FMD77 must only be insulated up to a certain height. The maximum permitted insulation
height is labelled on the devices and applies to an insulation material with a heat conductivity
≤0.04 W/(m x K) and to the maximum permitted ambient and process temperature (→see table
below). The data were determined under the most critical application "quiescent air".
P01-FMD77xxxx-11-xx-xx-xx-000
Fig. 22: Maximum permitted insulation height
➁➀
λ0.04≤W
mK•
TA
TP
FMD77
Ambient temperature (TA)≤70°C (158°F)
Process temperature (TP) max. 400°C (752°F), depending on the
diaphragm seal filling oil used (→see Technical
Information TI00382P Deltabar S)

Installation Deltabar S FMD76/77/8, PMD70/75 with PROFIBUS PA
20 Endress+Hauser
3.3.7 Wall and pipe-mounting (optional)
Endress+Hauser offers a mounting bracket for installing the device on pipes or walls. A bracket with
mounting accessories for pipe mounting is included with the device.
!Note!
When using a valve block, the block's dimensions must be taken into account.
P01-xMD7xxxx-11-xx-xx-xx-008
Fig. 23: Mounting bracket for wall and pipe mounting
1 Device mounting
Please note the following when mounting:
• Devices with capillary lines: mount capillaries with a bending radius of ≥ 100 mm (3.94 in).
• To prevent the mounting screws from scoring, lubricate them with a multi-purpose grease prior
to mounting.
• In the case of pipe mounting, the nuts on the bracket must be tightened uniformly with a torque
of at least 30 Nm (22.13 lbf ft).
106
74
74
124
135
37.5
➀