Differential pressure with ceramic and polysilicon sensors for flow,
level and differential measurement
High accuracy with excellent long-term stability
HART®, Foundation Fieldbus or PROFIBUS-PA protocols
PMD70
Applications
Deltabar S pressure transmitters are suitable for:
• Flow measurement (volumetric or mass flow) in
conjunction with primary elements in gas, steam
and liquid applications.
• Level, volume or mass measurement in liquids.
• Differential pressure monitoring, e.g. across filters or
pumps.
• Corrosive or abrasive applications using unique
ceramic sensor technology (PMD 70). For example,
DP measurement across a filter with abrasive
product.
• High temperatures up to 662°F (350°C) with
remote diaphragm seals (FMD 78).
Your benefits
Top of the line technical specifications:
• High long-term stability (0.05% of URL/year)
• High accuracy: up to ±0.075% span (< 15 : 1
turndown), with optional Platinum version (±0.05%
span)
• Turn down 100 : 1 standard, higher on request
Designed with safety in mind to keep your plant,
equipment and personnel safe:
• SIL-2 certificate optional
• Function-monitoring of the measuring cell by the
Sanitary tank spud
with 2" extended
diaphragm seal
P01-FMD78xxx-03-xx-xx-xx-008
Taper adapter with
DIN 11851– DN 50
coupling nut
P01-FMD78xxx-03-xx-xx-xx-003
Threaded adapter
P01-FMD78xxx-03-xx-xx-xx-004
ANSI flange
EN/DIN flangeEN 1092-1/
P01-FMD78xxx-03-xx-xx-xx-001
DIN 11851– DN 50
ANSI B 16.5– 2"
DIN 2527
ANSI flange
P01-FMD78xxx-03-xx-xx-xx-002
ANSI B 16.5– 3" with 2"/4"/6"/
d = 100 mmDependent on the
clamp used
PN 25
–DN 65
–DN 80
PN 25
–DN 65
–DN 80
150 lb and 300 lb
–3"
–4"
–DN 50
Up to 40 bar
–DN 80
–DN 100
150 lb
8" extended
diaphragm seal
– 4" with 2"/4"/6"/
8" ext. diaphr. seal
Endress+Hauser5
Page 6
Measuring principle
Deltabar S
Ceramic measuring diaphragms used for PMD 70
and FMD 76
1
2
p
1
3
4
5
P01-xMD7xxxx-03-xx-xx-xx-000
Ceramic measuring cell PMD 70 and FMD 76
1Meter body
2Diaphragm
3Electrodes
4Glass frit fixes the diaphragm onto the meter
body
5Temperature sensor
p
2
Ceramic measuring diaphragms used for PMD 70 and FMD 76
The ceramic measuring cell is based on the principle of a plate capacitor with an electrode on (1) and a movable
electrode on the interior of the diaphragm (3). Standard silicone oil or mineral oil filling oils for this measuring
cell.
A differential pressure (p
are converted and are fed to the microprocessor of the transmitter as a digital signal.
Advantages:
• Self-monitoring for diaphragm break or oil loss (constant comparison of the measured temperature with a
temperature calculated from the capacitance values)
• Extremely high resistance to aggressive media
• Suitable for vacuums up to 0.02 psi
• Metal-free versions available
• Secondary process barrier for enhanced mechanical integrity
Metallic measuring diaphragms used for PMD 75, FMD 77 and FMD 78
1
2
6
5
P01-xMD7xxxx-03-xx-xx-xx-002
(1 mbar
abs
3
p
4
2
)
abs
p
1
Metal measuring cell for 40 inH2O (100 mbar) and
above
6Sensing element
7Overload diaphragm/Middle diaphragm
8Filling oil
9Separating diaphragm
≠ p2) causes a corresponding deflection of both diaphragms. Both capacitance values
1
7
8
p
2
9
P01-xMD7xxxx-03-xx -xx-xx-003
Metallic measuring diaphragms used for PMD 75, FMD 77 and FMD 78
The separating diaphragms (3/9) are deflected on both sides by the acting pressures. A filling oil (4/8) transfers
the pressure to a resistance circuit bridge (semi-conductor technology). The change due to differential pressure
of the bridge output voltage is measured and further processed.
Advantages:
• Standard operating pressures: 2320 psi and 6100 psi (160 bar and 420 bar)
• High long-term stability
• Very high single-sided overload resistance
• Secondary process barrier for enhanced mechanical integrity
6Endress+Hauser
Page 7
Deltabar S
Flow measurementDesign and operation mode
++
Dp
p
p
2
1
Dp
Q~
Q
Flow measurement with Deltabar S and primary element, left: Orifice plate and right: Pitot tube
QFlow
∆
pDifferential pressure, ∆p = p1 – p
2
Q~
Q
––
p
p
1
2
P01-PMD7xxxx-15-xx-xx-xx-000
Your benefits
• Choice of four flow modes of operation: volume flow, norm volume flow (European norm conditions),
standard volume flow (American standard conditions) and mass flow.
• Choice of flow units with automatic unit conversion.
• User-specified custom measuring units.
• Low flow cut off: when activated, this function suppresses small flows which can lead to large fluctuations
in the measured value.
• Contains two totalizers as standard. One totalizer is user-resettable.
• The totalizing mode and unit can be individually set for each totalizer. This allows independent daily and
annual quantity totalizing.
Endress+Hauser7
Page 8
Deltabar S
Level measurement (level,
volume and mass)
Design and operation mode
–
–
h=
Dp
r g
1
h
2
+
3
+
P01xMD7xxxx-15-xx-xx-xx-000
Level measurement with Deltabar S
1Level measurement via impulse piping and PMD 70
2Level measurement with FMD 76
3Level measurement via capillaries and FMD 78
hHeight (level)
∆
pDifferential pressure
ρ
Density of the medium
gGravitation constant
Your benefits
• Choice of three level operating modes
• Volume and mass measurements in any tank shape by means of a freely programmable characteristic curve
• Choice of level units with automatic unit conversion
• User-specified custom measuring units
• Has a wide range of uses, e.g.
– for level measurement in tanks with static pressure
– in the event of foam formation
– in tanks with agitators of screen fittings
– in the event of liquid gases
– for standard level measurement
Communication protocol
• 4 to 20 mA with HART communication protocol
• PROFIBUS-PA
– The Endress+Hauser Deltabar S devices meet the requirements as per the FISCO model.
– Due to the low current consumption of 12 mA
– up to 9 Deltabar S for EEx ia, CSA IS and FM IS applications
– up to 32 Deltabar S for all other applications, e.g. in non-hazardous areas, EEx nA, etc.
can be operated at one bus segment with installation as per FISCO.
Further information on PROFIBUS-PA, such as requirements for bus system components, can be found in
the Operating Instructions BA 198F "PROFIBUS-DP/-PA: Guidelines for planning and commissioning" and
in the PNO guideline.
• Foundation Fieldbus
– The Endress+Hauser Deltabar S devices meet the requirements as per the FISCO model.
– Due to the low current consumption of 12 mA
– up to 9 Deltabar S for EEx ia, CSA IS and FM IS applications
– up to 32 Deltabar S for all other applications, e.g. in non-hazardous areas, EEx nA, etc.
can be operated on one bus segment with installation as per FISCO.
Further information on Foundation Fieldbus, such as requirements for bus system components, can be found
in the Operating Instructions BA 013S "Foundation Fieldbus Overview".
8Endress+Hauser
Page 9
Deltabar S
Human interface
Display module (optional)A 4-line liquid crystal display (LCD) is used for display and operation. The display module shows measured
values, dialog text as well as fault and notice messages in plain text, thereby supporting the user in every stage
of operation.
Functions:
• 8-digit measured value display including sign and decimal point, bargraph for current display
• Simple and complete menu guidance due to separation of the parameters into three levels (blocks, groups
and functions)
• Each parameter is given a 3-digit ID number for easy navigation.
• Option for configuring the display according to individual requirements and desires, such as language,
alternating display, display of other measured values such as sensor temperature, contrast setting
• 4 to 20 mA HART: rapid and safe commissioning with the Quick Setup menus
Measured value display
Identification
number
Unit
Header line
Main line
Information
line
Function nameValue
Symbol
Editing modes
Bargraph
Selection
option
Edit value
Current measured value
P01-xMD7xxxx-07-xx-xx-xx-000
Operating elementsThe operating buttons are located either under the protective cap on the exterior of the device or inside on the
electronic insert, depending on configuration of transmitter.
Operating buttons on the exterior of the device
P01-xxxxxxxx-19-xx-xx-xx-038
Endress+Hauser9
Page 10
Deltabar S
The operating buttons located externally on the device work on the Hall sensor principle. This guarantees the
following advantages:
• Complete protection against environmental influences such as moisture and contamination
• Simple operation without any tools
• No wear
Note!
With the "External push buttons" option, a display module is always purchased. → See also page 53 ff, feature
20 "Electronics, communication, display, operation".
Operating keys and elements located internally on the electronic insert
1
2
3
4
PC
21
on
Sensor
Display
Histo
Damping
ROM
[]
off
5
t
6
onoff
P01-xxxxxxxx-19-xx-xx-xx-074
Electronic insert HART
1Operating keys
2Green LED to indicate acceptance of value
3Slot for optional display
4Slot for optional HistoROM
M-DAT
5DIP-switch for locking/unlocking measured-
value parameters
6DIP-switch for damping on/off
®
HistoROM
/M-DAT
(optional)
®
/
HistoROM®/M-DAT is a memory module, which is attached to the electronic insert. The HistoROM®/M-DAT
can be retrofitted into an existing transmitter.
2
0%
Zero
21
345 678
01
3
12
Address
3
Display
HW
CKON
SDA08
PC
5
678
SW
4
ROM
Histo
P01-xxxxxxxx-19-xx-xx-xx-075
4
5
1
off
on
2
1
7
6
onon
21
off off
Sensor
Electronic insert PROFIBUS PA
1Green LED to indicate acceptance of value
2Key for position calibration
3Slot for optional display
4Slot for optional HistoROM
®
/
M-DAT
5DIP-switch for hardware address
6DIP-switch without function
7DIP-switch for locking/unlocking measured-
value parameters
Sensor
on
off
F
OUNDATION
2
0%
Zero
01
3
Display
P01-xxxxxxxx-19-xx-xx-xx-054
4
HW
PC
ROM
Histo
5
1
off
on
2
Simulation
6
1
21
Simulation
Electronic insert Foundation Fieldbus
1Green LED to indicate acceptance of value
2Key for position calibration
3Slot for optional display
4Slot for optional HistoROM
®
/
M-DAT
5DIP-switch for simulation mode
6DIP-switch for locking/unlocking measured-
value parameters
Your benefits
• Quick and safe commissioning of the same measuring points by copying the configuration data of one
transmitter to another transmitter
• Reliable process monitoring due to cyclical recording of pressure and sensor temperature measured values
• Simple diagnosis by recording events such as alarms, maximum indicators, counters for measuring
excursions outside user-specified pressure and temperature limits
• Analysis and graphic evaluation of the events and process parameters via ToF Tool (contained in scope of
supply)
®
HistoROM
/M-DAT can be ordered via feature 100 "Additional options 1" or feature 110 "Additional options
2". → See also page 53 ff.
10Endress+Hauser
Page 11
Deltabar S
Local operationFunctions 4 to 20 mA HART
• With display module: navigate through the operating menu using three operating buttons
• Without display module:
– Position calibration (zero point correction)
– Setting lower-range value and upper-range value – reference pressure present at device
– Value acceptance indicated by green LED
• Device reset
• Locking and unlocking measured-value parameters
• Switching damping on and off
Functions PROFIBUS-PA
• Position calibration (zero point correction)
• Value acceptance indicated by green LED
• Locking and unlocking measured-value parameters
• Setting hardware address
Functions Foundation Fieldbus
• Position calibration (zero point correction)
• Value acceptance indicated by green LED
• Locking and unlocking measured-value parameters
• Switching simulation mode on and off
Handheld terminals – HARTWith a handheld terminal, all the parameters can be configured anywhere along the 4 to 20 mA line via menu
operation.
ToF Tool –
HART, PROFIBUS PA
The ToF Tool is a graphic and menu-guided operating program for measuring devices from
Endress+Hauser. It is used for supporting the commissioning, data storage, signal analysis and documentation
of the devices. The following operating systems are supported: Win95, Win98, WinNT4.0, Win2000 and
Windows XP. You can set all parameters via the ToF Tool.
The ToF Tool supports the following functions:
Configuration of transmitters in online operation
•
• Loading and saving device data (upload/download)
• HistoROM
®
/M-DAT analysis
• Documentation of the measuring point
Connection options:
• HART via Commubox FXA 191 and the serial interface RS 232 C of a computer
• PROFIBUS-PA via segment coupler and PROFIBUS interface card
• Service interface with adapter FXA 193
Commuwin II –
HART, PROFIBUS-PA
Commuwin II is a graphically supported operating program for intelligent measuring devices with the
communication protocols HART and PROFIBUS-PA. The following operating systems are supported: Win 3.1/
3.11, Win 95, Win 98, WinNT4.0 and Win2000. Commuwin II displays the most important parameters.
Commuwin II supports the following functions:
• Configuration of measuring devices in online operation via matrix operation
• Loading and saving device data (upload/download)
• Visualization of measured and limit values
• Presentation and recording of measured values with a line recorder.
Connection option:
• HART via Commubox FXA 191 and the serial interface RS 232 C of a computer
• PROFIBUS PA via segment coupler and PROFIBUS interface card
Remote operation –
Foundation Fieldbus
An FF configuration program is required to integrate a device with "Foundation Fieldbus signal" into an FF
network or to set the FF-specific parameters. Please contact your local Endress+Hauser Sales for more
information.
Endress+Hauser11
Page 12
Deltabar S
Input
Measured variableDifferential pressure, from which flow (volume or mass current) and level (level, volume or mass) are derived
1) MWP = Maximum working pressure. → See also page 26, section "Pressure specifications".
2) FMD 77, FMD 78: The maximum pressure for the measuring device is dependent on the lowest-rated element, with regard to pressure, of the
selected components. → See also page 26, section "Pressure specifications".
3) The specified minimum operating pressure applies to the PMD 75 at the reference operating conditions for silicone oil. Min. operating
pressure at 185°F (85°C) for silicone oil: 0.145 psi
must also be observed for the FMD 77 and FMD 78. → See also page 46, section "Diaphragm seal filling oils".
(10 mbar
abs
). The pressure and temperature application limits of the selected filling oil
abs
4) Versions in the order code → See also page 53 ff, feature 40 "Measuring cell, nominal operating range, PN"
5) Minimum span that can be calibrated, turn down > 100:1 on request
1) MWP = Maximum working pressure. → See also page 26, section "Pressure specifications".
2) The specified overload only applies to the measuring cell. The maximum pressure for the measuring device is dependent on the weakest element,
with regard to pressure, of the selected components. → See also page 26, section "Pressure specifications".
3) Min. operating pressure at the reference operating conditions for silicone oil. Min. operating pressure at 185°F (85°C): to 0.145 psi
4) Versions in the order code → See also page 53 ff, feature 40 "Measuring cell, nominal operating range, PN"
5) Minimum span that can be calibrated, turn down > 100:1 on request
2
Min.
operating
pressure
3
Versions in the
order code
4
sides
]
abs
(10 mbar abs)
abs
Explanation of terms
1
LRV
0
(40 inH O)
3
URV
100
LRL
–500 mbar
(-200 inH O)
2
Example: 200 inH2O (500 mbar) sensor
1Set span
2Nominal value
i
Upper range limit (URL)
3Nominal measuring range
LRL Lower range limit
URL Upper range limit
LRV Lower range value
URV Upper range value
URL
+ 500 mbar
(+200 inH O)
2
2
P01-xxxxxxxx-05-xx-xx-xx-001
2
Explanation of the term 'Turn down (TD)'
(TD = turn down)
Turn down = nominal value/set span
Example:
Nominal value = 200 inH
Set span = 40 inH
TD = 5:1
O (500 mbar)
2
O (100 mbar)
2
Endress+Hauser13
Page 14
Output
Output signal• 4 to 20 mA with superimposed digital communication protocol HART, 2-wire
• Digital communication signal PROFIBUS-PA (Profile 3.0)
• Digital communication signal Foundation Fieldbus
Deltabar S
Signal on alarm
Load – 4 to 20 mA HART
• 4 to 20 mA HART
Options:
– Max. alarm*: can be set from 21 to 23 mA
– Keep measured value: last measured value is kept
– Min. alarm: 3.6 mA
* Factory setting: 22 mA
• PROFIBUS-PA: can be set in the Analog Input block, options: good, bad, uncertain
• Foundation Fieldbus: can be set, options: good, bad, uncertain
R
1
L
max
[]W
1500
1282
847
4
413
10.5
Load diagram, observe the position of the jumper and the explosion protection (→ See also page 16, section "Measuring 4
to 20 mA test signal".)
1Jumper for 4 to 20 mA test signal inserted in "Standard" position
2Jumper for 4 to 20 mA test signal inserted in "Test" position
3Supply voltage 10.5 (11.5) to 30 V DC for EEx ia, 1/2 D, 1 GD, 1/2 GD, FM IS and CSA IS
4Supply voltage 10.5 (11.5) to 45 V DC for device for non-hazardous areas, 1/3 D, EEx d, EEx nA, FM XP, FM DIP,
FM NI, CSA XP and CSA Dust-Ex
Maximum load resistance
R
Lmax
USupply voltage
3
40 45
[V]
U
30
20
U – 10.5 V
R
£
L
max
23 mA
R
2
L
max
TestTest
[]W
1456
1239
804
4
369
11.5
3
30
20
U – 11.5 V
R
£
L
max
23 mA
U
40 45
[V]
P01-xMD7xxxx-05-xx-xx-xx-000
Note!
When operating via a handheld terminal or via PC with an operating program, a minimum communication
resistance of 250 Ω must exist within the loop.
Resolution
• Current output: 1 µA
• Display: can be set (setting at the factory: presentation of the maximum accuracy of the transmitter)
Reading cycle
• HART commands: on average 3 to 4 per second
• PROFIBUS-PA:
– cyclic: on average 100/s
– acyclic: on average 20/s
• Foundation Fieldbus:
– cyclic up to 5/s, dependent on the number and type of function blocks used in a closed-control loop
– acyclic: 10/s
14Endress+Hauser
Page 15
Deltabar S
Damping• Via display module, handheld terminal or PC with operating program, continuous from 0...999 s
• Additionally for HART: via DIP-switch on the electronic insert, switch position "On = set value" and "Off"
• Factory setting: 2 s
Power supply
Electrical connectionNote!
• When using the measuring device in hazardous areas, installation must comply with the corresponding
national standards and regulations and the Safety Instructions (XAs) or Installation or Control Drawings
(ZDs). → See also page 67, section "Safety Instructions" and "Installation/Control Drawings".
• Protective circuits against reverse polarity, HF influences and overvoltage peaks are installed.
4 to 20 mA HART
1
Test
2
3
4... 20mA
Test
5
4to20mA
Test
4 to 20mA
4
Electrical connection 4 to 20 mA HART
1Housing
2Jumper for 4 to 20 mA test signal.
→ See also page 16, section "Measuring 4 to 20 mA" .
3Internal ground terminal
4External ground terminal
54 to 20 mA test signal between positive and test terminal
6Minimum supply voltage = 10.5 V DC, jumper is inserted in accordance with the illustration.
7Minimum supply voltage = 11.5 V DC, jumper is inserted in "Test" position.
PROFIBUS PA
The two-wire cable must be connected to the "PA+" and "PA–" terminals.
10.5 V DC
6
11.5 V DC
7
Test
P01-xMx7xxxx-04-xx-xx-xx-001
Foundation Fieldbus
The two-wire cable must be connected to the "FF+" and "FF–" terminals.
Endress+Hauser15
Page 16
Deltabar S
Measuring 4 to 20 mA test signal
A 4 to 20 mA 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 lower voltage sources. Observe the position of the jumper in accordance
with the following table.
Jumper position for test signalDescription
Test
– Measuring 4 to 20 mA test signal via plus and test terminal:
not possible.
– Delivery status
– minimum supply voltage: 10.5 V DC
Supply voltageNote!
• When using the measuring device in hazardous areas, installation must comply with the corresponding
national standards and regulations and the Safety Instructions (XAs) or Installation or Control Drawings
(ZDs).
• 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. → See
also page 67, sections "Safety Instructions" and "Installation/Control drawing".
4 to 20 mA HART
• Version for non-hazardous areas, jumper for 4 to 20 mA test signal in "Standard" position: 10.5 to 45 V DC
• Version for non-hazardous areas, jumper for 4 to 20 mA test signal in "Test" position:
11.5 to 45 V DC
PROFIBUS-PA
Version for non-hazardous areas: 9 to 32 V DC
Foundation Fieldbus
Version for non-hazardous areas: 9 to 32 V DC
Test
– Measuring 4 to 20 mA test signal via plus and test terminal:
possible. (Thus, the output current can be measured without
interruption via the diode.)
– minimum supply voltage: 11.5 V DC
Current consumption
• PROFIBUS-PA: 11 mA ± 1 mA, switch-on current corresponds to table 4, IEC 61158-2
• Foundation Fieldbus: 11 mA ± 1 mA, switch-on current corresponds to table 4, IEC 61158-2
Cable entry→ See also page 53 ff , feature 30 "Housing, Cable entry, Protection".
Cable specification
• Endress+Hauser recommends using shielded, twisted-pair two-wire cables.
• Terminals for wire cross-sections 0.5 to 2.5 mm
2
• Cable external diameter: 5 to 10 mm
Residual rippleWithout 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
16Endress+Hauser
Page 17
Deltabar S
Performance characteristics – general
Reference operating conditions• As per IEC 60770
• Ambient temperature T
• Humidity ϕ = constant, in the range of: 45 to 75 % r.H
• Ambient pressure p
• Position of the measuring cell: constant, in the range of: ±1°
• Input of LOW SENSOR TRIM and HIGH SENSOR TRIM for lower range value and upper range value
= constant, in the range of: +69.8 to +91.4°F (+21 to +33°C)
U
= constant, in the range of: 12 to 15 psi (860 to 1060 mbar)
U
(Aluminum oxide ceramic)
2O3
Long-term stabilityMeasuring cells ≥ 200 inH
O (500 mbar):
2
• ±0.05% of URL/year
• ±0.125% of URL/5 years
Measuring cells ≤ 40 inH
O (100 mbar):
2
• ±0.18% of URL/year
Influence of the installation
position
Vibration effectsPMD 70, PMD 75: ≤ Reference accuracy to 15 to 25 Hz: 1.6 mm; 25 to 1000 Hz: 4g
Position-dependent zero shift can be corrected. → See also page 21, section "General installation instructions"
and page 50 ff, section "Installation instructions, Diaphragm seal systems".
Performance characteristics – metallic diaphragms
Reference accuracy –
PMD 75, FMD 77, FMD 78
The reference accuracy comprises the non-linearity including hysteresis and non-reproducibility in accordance
with the limit point method as per IEC 60770.
PMD 75
O (10 mbar), 12 inH2O (30 mbar) measuring cells:
4 inH
2
• TD 1:1: ±0.15% of URV
• TD > 1:1: ±0.15% of URV x TD
O (100 mbar) measuring cell:
40 in H
2
• TD 1:1 to TD 4:1: ±0.075% [±0.05%] of URV
• TD > 4:1: ±(0.012 • TD + 0.027)% of URV
Measuring cells ≥ 200 inH
O (500 mbar):
2
• TD 1:1 to TD 15:1: ±0.075% [±0.05%] of URV
• TD > 15:1: ±(0.0015 • TD + 0.05252)% of URV
FMD 77, FMD 78
O (100 mbar) measuring cell:
40 in H
2
• TD 1:1 to TD 4:1: ±0.075% of URV + influence from the diaphragm seal
• TD > 4:1: ±(0.012 • TD + 0.027)% of URV + influence from the diaphragm seal
Measuring cells ≥ 200 inH
O (500 mbar):
2
• TD 1:1 bis TD 15:1: ±0.075% of URV + influence from the diaphragm seal
• TD > 15:1: ±(0.0015 • TD + 0.05252)% of URV + influence from the diaphragm seal
– Values in brackets [ ] for devices with improved reference accuracy (PLATINUM version)
– The following applies for the root-extracting characteristic curve:
The accuracy data of the Deltabar S is taken into the accuracy calculation of the flow rate with a factor of 0.5.
The "Total performance" specification comprises the non-linearity including hysteresis, non-reproducibility, the
thermal change of the zero point as well as the influence of the line pressure (p
• ±0.15% of URV
1. For measuring ranges ≥ 200 inH2O (500 mbar) to TD 2:1
2. All specifications apply to the temperature range +14 to +140°F (–10 to +60°C).
The reference accuracy comprises the non-linearity including hysteresis and non-reproducibility in accordance
with the limit point method as per IEC 60770.
10 inH
O (25 mbar) measuring cell:
2
• TD 1:1: ±0.15% of URV
• TD > 1:1: ±0.15% of URV x TD
O (100 mbar) measuring cell:
40 inH
2
• TD 1:1 to TD 4:1: ±0.075% [±0.05%] of URV
• TD > 4:1: ±(0.012 • TD + 0.027)% of URV
200 inH
• TD 1:1 to TD 15:1: ±0.075% [±0.05%] of URV
• TD > 15:1: ±(0.0015 • TD + 0.05252)% of URV
O, 43 psi (500 mbar, 3 bar) measuring cell:
2
Total performance –
PMD 70, FMD 76
Warm-up period –
PMD 70, FMD 76
– Values in brackets [ ] for devices with improved reference accuracy (PLATINUM version)
– The following applies for the root-extracting characteristic curve:
The accuracy data of the Deltabar S is taken into the accuracy calculation of the flow rate with a factor of 0.5.
The "Total performance" specification comprises the non-linearity including hysteresis, non-reproducibility, the
thermal change of the zero point as well as the influence of the line pressure (p
• ±0.15% of URV
1. For measuring ranges ≥ 200 inH
2. All specifications apply to the temperature range +14 to +140°F (–10 to +60°C).
1, 2
O (500 mbar), TD 1:1
2
= 1015 psi / 70 bar).
st
5.4 s
Endress+Hauser19
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Deltabar S
Dynamic response time (T63) –
PMD 70, FMD 76
Influence of the operating
pressure on zero point and span
– PMD 70, FMD 76
Influence of the
operating pressure
on the zero point
Influence of the
operating pressure
on the span
±0.7% of URL/
100 psi (7 bar)
±0.14% of URL/
1015 psi (70 bar)
1
±0.175% of URL/
100 psi (7 bar)
±0.14% of URL/
1015 psi (70 bar)
Time constant (T63), t
• 40 inH
•
O (100 mbar) measuring cell: 280 ms
2
200 inH2O (500 mbar) measuring cell: 210 ms
±0.075% of URL/
1015 psi (70 bar)
±0.14% of URL/
1015 psi (70 bar)
t
P01-xxxxxxxx-05-xx-xx-xx-007
2
±0.075% of URL/
1015 psi (70 bar)
±0.14% of URL/
1015 psi (70 bar)
Thermal change of the zero
output and the output span –
PMD 70, FMD 76
Note!
The influence of the operating pressure on the zero point can be calibrated out.
+14 to +140°F (–10 to +60°C):
• 10 inH
• ≥ 40 inH
O (25 mbar) measuring cell: ±(0.35 • TD + 0.05)% of URV
2
O (100 mbar) measuring cells: ±(0.05 • TD + 0.05)% of URV
2
–40 to +14°F, +140 to +185°F (–40 to –10°C, +60 to +85°C):
• 10 inH
• ≥ 40 inH
O (25 mbar) measuring cell: ±(0.3 • TD + 0.15)% of URV
2
O (100 mbar) measuring cells: ±(0.08 • TD + 0.07)% of URV
2
20Endress+Hauser
Page 21
Deltabar S
Operating conditions (installation)
General installation instructions• For FMD 77 and FMD 78: See page 50 ff, "Installation instructions, Diaphragm seal systems" section.
• The position-dependent zero shift can be corrected directly at the device via operating keys, even in
hazardous areas. Diaphragm seals also shift the zero point, depending on the installation position (→ See also
page 50 ff, "Installation instructions, Diaphragm seal systems").
• The housing of the Deltabar S can be rotated up to 380°. → See also page 22, section "Rotating the
housing".
• Endress+Hauser offers a mounting bracket for installing on pipes or walls. → See also page 22, section
"Wall- and pipe-mounting".
• When measuring in media with solid proportions, such as dirty liquids, installing separators and drain valves
is useful for capturing and removing sediment.
• Using a three-valve or five-valve manifold allows for easy commissioning, installation and maintenance
without interrupting the process.
• General recommendations for 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.
• Install the impulse piping with a continuous gradient of at least 10%.
• When routing the impulse piping outdoors, ensure that sufficient anti-freeze protection is used, e.g. by using
pipe heat tracing.
Measuring arrangementFlow measurement
• The PMD 70 and PMD 75 are best suited to flow measurement.
• Measuring arrangement for gases: Mount device above the measuring point.
• Measuring arrangement for liquids and steam: Mount device below tapping point.
• For flow measurement in steam, mount the condensate traps at the same level as the tapping point and at
the same distance from Deltabar S.
Level measurement
• PMD 70, PMD 75, FMD 76 and FMD 77 are best suited to level measurement in open tanks. All Deltabar
S devices are suitable for level measurement in closed tanks.
Measuring arrangement level measurement in open tanks
• PMD 70, PMD 75: Mount device below the lower measuring connection. The negative side is open to
atmosphere pressure.
• FMD 76, FMD 77: Mount device directly on the tank or with shut-off valve. The negative side is open to
atmospheric pressure.
Measuring arrangement level measurement in closed tanks and closed tanks with static pressure
• PMD 70, PMD 75: Mount device below the lower measuring connection. Always connect the negative side
above the maximum level.
• FMD 76, FMD 77: Mount device directy on the tank. Always connect the negative side above the maximum
level.
• In the case of level measurement in closed tanks with static pressure, a condensate trap ensures pressure
which remains constant on the minus side.
Pressure measurement
• The PMD 70 and PMD 75 are best suited to differential pressure measurement.
• Measuring arrangement for gases: Mount device above the measuring point.
• Measuring arrangement for liquids and steam: Mount device below tapping point.
• For differential pressure measurement in steam, mount the condensate traps at the same level as the tapping
point and at the same distance from Deltabar S.
Endress+Hauser21
Page 22
Deltabar S
Wall- and pipe-mountingEndress+Hauser offers a mounting bracket for installing on pipes or walls. → See also page 53 ff, feature 110,
"Additional options 2".
Note!
If a manifold valve is used, its dimensions should also be taken into consideration.
~ 12.2”
310)
6.62”
(66.5)
3.41”
(86.5)
(
4.25”
(108)
4.84”
(123)
0.39”
(10)
max. ø2.50”
(63)
2.91”
(74)
5.63”
(143)
1.77”
(45)
~ 8.66”
(220)
~ 11.4”
(290)
Rotating the housingThe housing can be rotated up to 380° by loosening the Allen screw.
Your benefits
• Simple mounting by optimally aligning the housing
• Good, accessible device operation
• Optimum readability of the display module (optional).
max. 380°
3.94”
(100)
P01-xMD7xxxx-17-xx-xx-xx-000
P01-xMD7xxxx-17-xx-xx-xx-001
Align the housing by loosening the Allen screw with an Allen key (2 mm)
22Endress+Hauser
Page 23
Deltabar S
Oxygen applicationsOxygen and other gases can react explosively to oils, grease and plastics, such that, among other things, the
following precautions must be taken:
– All components of the system, such as measuring devices, must be cleaned in accordance with standard
requirements (BAM, DIN 19247, CGA-4.1-1996, AGA G93-96).
– Dependent on the materials used, maximum temperature and a maximum pressure must not be exceeded.
The devices suitable for oxygen applications are listed in the following table with the specifications T
.
p
max
max
and
Order code for devices cleaned for
oxygen applications
1) For devices with 4 inH2O (10 mbar) and 12 inH2O (30 mbar) measuring cell: 1450 psi (100 bar)
2) Higher pressures on request
p
for oxygen
max
applications
T
for oxygen
max
applications
1
140°F (60°C)Halocarbon 6.3
2
140°F (60°C)FKM Viton V80G2 seal
2
140°F (60°C)PTFE seal GF 25
Restrictive component
(copper ring seal)
Ultra pure gas applicationsEndress+Hauser also offers degreased devices for special applications, such as ultra pure gas.
No special restrictions regarding the process conditions apply to these devices.
→ See also page 53 ff, PMD 70 and PMD 75: feature 80 "Gasket material", FMD 76 and FMD 77: feature 70
"Process connection low-pressure side, material, seal".
Diaphragms for materials with
hydrogen build-up (RhodiumGold coating)
When materials are used in which hydrogen build-up occurs, hydrogen atoms can diffuse through the metals
of the sensor. This can lead to corrupt measurement results.
Endress+Hauser offers diaphragms with Rhodium-Gold coating for this application.
→ See also page 56 "Ordering information PMD 75", page 62 "Ordering information FMD 77" or page 65
"Ordering information FMD 78", feature 60 "Material diaphragm".
Operating conditions (Environment)
Ambient temperature range• PMD 75, FMD 77, FMD 78: –40 to +185°F (–40 to +85°C),
devices for lower temperatures on request
• PMD 70, FMD 76: –40 to +185°F (–40 to +85°C)
For devices for use in hazardous areas, see Safety instructions (XA...), Installation or Control Drawing (ZD...).
(→ See also page 67, sections "Safety Instructions" and "Installation/Control drawings".)
The device can be used in this temperature range; however, certain specification values, such as accuracy, can
be exceeded. → See also DIN 16086.
Endress+Hauser23
Page 24
Deltabar S
Storage temperature range• –40 to +212°F (–40 to +100°C)
• Display module: –40 to +185°F (–40 to +85°C)
Degree of protection→ See page 53 ff, feature 30 "Housing, Cable entry, Protection".
Climate classClass 4K4H (air temperature:–4 to +131°F/ –20 to 55°C , relative humidity: 4 to 100%) fulfilled as per
DIN EN 60721-3-4 (condensation possible)
Vibration resistancePMD 70, PMD 75: guaranteed for 15 to 25 Hz: 1.6 mm; 25 to 1000 Hz: 4 g in all 3 planes
Electromagnetic
compatibility
Overvoltage protectionProtective diodes: gas discharger 230 V, nominal discharge current 10 kA
Interference emission as per EN 61326 electrical device B, Interference immunity as per EN 61326 appendix
A (industrial use) and NAMUR EMC recommendation (NE 21).
With increased interference immunity against electromagnetic fields as per EN 61000-4-3: 30 V/m
→ See also page 53 ff, feature 100 "Additional options 1" and feature 110 "Additional options 2".
Operating conditions (Process)
Process temperature limits• PMD 70: –40 to +185°F (–40 to +85°C)
• FMD 76: –40 to +185°F (–40 to +85°C)
• PMD 75: –40 to +248°F (–40 to +120°C),
with side flanges C22.8: 14 to +248°F (–10 to +120°C)
• FMD 77 and FMD 78, depending on the diaphragm seal and filling oil: up to +662°F (+ 350°C)
Note!
• For oxygen applications, observe page 23 "Oxygen applications" section.
• PMD 70, FMD 76, PMD 75 and FMD 78: Observe the temperature operating range of the seal.
→ See also the following section "Temperature operating range, seals".
• FMD 77 and FMD 78: Observe the temperature application limits of the diaphragm seal oil.
→ See also page 46, sections "Diaphragm seal filling oils".
• FMD 77 and FMD 78: Do not use diaphragm seals with 0.09 mm PTFE foil on AISI 316L (1.4435/1.4405)
for vacuum applications; upper temperature limit +400°F (+205°C).
Temperature operating range,
seals
PMD 70 (with ceramic measuring diaphragms)
Versions in the order code SealTemperature operating range
AFKM Viton, Compound VC601–4 to +185°F (–20 to +85°C)
BEPDM, Compound E 7502–4 to +185°F (–20 to +85°C)
CKalrez, Compound 6375+41 to +185°F (+5 to +85°C)
1FKM Viton, degreased,
Compound V 80G2
2FKM Viton, cleaned for oxygen service,
Compound V80G2
1) Seal for lower temperatures on request
+14 to +185°F (–10 to +85°C)
+14 to +140°F (–10 to +60°C)
1
24Endress+Hauser
Page 25
Deltabar S
FMD 76 (with ceramic measuring diaphragms)
Versions in the order code SealTemperature operating range
B, D, F, G, UFKM Viton, Compound VC601–4 to +185°F (–20 to +85°C)
K, LEPDM, Compound E7502,
–4 to +185°F (–20 to +85°C)
FDA 21 CFR 177.2600
M, NKalrez, Compound 6375+41 to +185°F (+5 to +85°C)
P, QChemraz, Compound 505–4 to +185°F (–20 to +85°C)
SFKM Viton, degreased,
+14 to +185°F (–10 to +85°C)
Compound V80G2
TFKM Viton, cleaned for oxygen service,
+14 to +140°F (–10 to +60°C)
Compound V80G2
1) Seal for lower temperatures on request
PMD 75 (with metallic measuring diaphragms)
Versions in the order code SealTemperature operating range
AFKM Viton,
Compound 37559 FPM 90 GLT green
CPTFE, GF25–40 to +185°F (–40 to +85°C)
FNBR,
Compound NB 3431/N7003/N7083
HCopper–40 to +185°F (–40 to +85°C)
KCopper, cleaned for oxygen service–40 to +140°F (–40 to +60°C)
1FKM Viton, degreased, Compound V80G2 +14 to +185°F (–10 to +85°C)
2FKM Viton, cleaned for oxygen service,
Compound V80G2
3PTFE, cleaned for oxygen applications,
GF25
–4 to +185°F (–20 to +85°C)
–4 to +185°F (–20 to +85°C)
+14 to +140°F (–10 to +60°C)
–40 to +140°F (–40 to +60°C)
1
1
1
1
1
1) A lower temperature application limit of +14°F (–10°C) applies to measuring cells with PN 420.
FMD 77 (with metallic measuring diaphragms)
Versions in the order code Seal on the LP side (–)Temperature operating range
B, D, F, GFKM Viton,
Compound 37559 FPM 90 GLT green
H, JPTFE, Compound GF25–40 to +185°F (–40 to +85°C)
K, LEPDM, Compound E7502–40 to +185°F (–40 to +85°C)
M, NKalrez, Compound 6375+41 to +185°F (+5 to +85°C)
P, QChemraz, Compound 505–4 to +185°F (–20 to +85°C)
SFKM Viton, degreased,
Compound V80G2
TFKM Viton, cleaned for oxygen service,
Compound V80G2
–4 to +185°F (–20 to +85°C)
+14 to +185°F (–10 to +85°C)
+14 to +140°F (–10 to +60°C)
Endress+Hauser25
Page 26
Deltabar S
Pressure specificationsThe maximum pressure for the measuring device is dependent on the lowest-rated element with regard to
pressure, see the following sections for this:
– → page 12, section "Measuring range"
– → page 23, section "Oxygen applications"
– → chapter "Mechanical construction".
Observe pressure-temperature dependency.
Note!
• The MWP (maximum working pressure) is specified on the nameplate. This value refers to a reference
temperature of 68°F (20°C) or 100°F for ANSI flanges.
• Test pressure (Over pressure limit OPL) = MWP (nameplate) x 1.5.
• The pressure values permitted at higher temperatures can be found in the following standards:
– EN 1092-1: 2001 Tab. 18
– ASME B 16.5a – 1998 Tab. 2-2.2 F316
– ASME B 16.5a – 1998 Tab. 2.3.8 N10276
– JIS B2201
Mechanical construction
Housing dimensions, optional
display on the side (T14)
Housing dimensions, optional
display on the top (T15)
5.98”
(152)
4.37”
(111)
Front view, left-hand side view, top view
6.10”
(155)
4.53”
(115)
5.71”
(145)
6.06”
(154)
6.50”
(165)
FIELDTERMINALS
4.37”
(111)
5.00”
(127)
P01-xMD7xxxx-06-00-xx-xx-000
P01-xMD7xxxx-06-00-xx-xx-001
Front view, left-hand side view, top view
26Endress+Hauser
Page 27
Deltabar S
Process connections PMD 70
(with ceramic measuring
diaphragms)
H
4.25”
(108)
1.63”
(41.3)
54
84
7/16”-20 UNF
M10
1/4”-18 NPT
RC1/4
3.78”
(96)
P01-xMD7xxxx-06-00-xx-xx-000
Process connection PMD 70, oval flange
HDevice height → see page 28, section "Device height H"
1) For ANSI flange Class in lb./sq.in and JIS flange Nominal pressure in K
2) For housing weight see page 44
3) Combination of AISI 316 for required pressure resistance and AISI 316L for required chemical resistance (dual rated)
4) ECTFE coating on AISI 316L.
When operating in hazardous area, avoid electrostatic charge of the plastic surfaces.
32Endress+Hauser
Page 33
Deltabar S
Device height H, devices with flange
DescriptionDevice height H (h + b)
Housing, optional display on the side6.89" (175 mm) + flange thickness b (see tables)
Housing, optional display on the top, flat cover7.12" (181 mm) + flange thickness b (see tables)
Housing, optional display on the top, high cover7.56" (192 mm) + flange thickness b (see tables)
Hygienic connection, sanitary tank spud
H
4.39”
(111.5)
2.11”
(53.5)
ø3.60”
(91.45)
ø3.94”
(100)
ø5.22”
(132.7)
P01-FMD76xxx-06-09-xx-xx-002
Process connection FMD 76, version 5, high-pressure side: sanitary tank spud, extended diaphragm seal 2",
low-pressure side: connection 1/4"-18 NPT, material AISI 316L
Note: DP ceramic cell not resistant to caustics.
Device height H
Process connections
FMD 77 (with metallic
measuring diaphragms), lowpressure side
DescriptionDevice height H
Housing, optional display on the side10.1" (257 mm)
Housing, optional display on the top, flat cover10.4" (263 mm)
Housing, optional display on the top, high cover10.8" (274 mm)
3.94”
(100)
7/16”-20 UNF
1.63”
(41.3)
1/4”-18 NPT
P01-FMD77xxx-06-xx -xx-xx-000
5.91”
(150)
+
–
4.08”
(103.7)
Low-pressure side: connection 1/4"-18 NPT, mounting optionally 7/16"-20 UNF, high-pressure side, see the following
section "Process connections, high-pressure side FMD 77"
Endress+Hauser33
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Deltabar S
Process connections
FMD 77 (with metallic
measuring diaphragms), highpressure side
Note!
Specifications for the "T
Ambient" and "TK Process" are listed in the following tables. These temperature
K
coefficients apply to silicone oil and the membrane material AISI 316L. For other filling oils, this temperature
coefficient must be multiplied by the T
correction factor of the corresponding filling oil. For the TK correction
K
factors, see also page 46, section "Diaphragm seal filling oils".
EN/DIN flanges, connections as per EN 1092-1/DIN 2527
h
g
2
d
M
k
D
Process connection FMD 77, high-pressure side EN/DIN flange with and without extended diaphragm seal, material AISI
316L
HDevice height see page 36, → section "Device height H"
– 10 inH
– 200 inH
– for oxygen and ultra pure gas applications: Voltalef
• Process diaphragm PMD 70/FMD 76: Al
O (25 mbar) and 40 inH2O (100 mbar) measuring cell: Silicone oil
2
O (500 mbar) and 1200 inH2O (3000 mbar) measuring cell: Mineral oil
2
(Aluminum oxide ceramic)
2O3
• O-ring for cover sealing: NBR
Nameplates: AISI 304 (1.4301)
•
• Mounting accessories: Mounting kit with screws AISI 304 (1.4301)
• Capillary: AISI 316 Ti (1.4571)
• Protective armor for capillary: AISI 304 (1.4301)
→ For process connections, process diaphragms, seals and filling oils see ordering information, page 53 ff.
44Endress+Hauser
Page 45
Deltabar S
Planning instructions, diaphragm seal systems
ApplicationsDiaphragm seal systems should be used if the process media and the device should be separated. Diaphragm
seal systems offer clear advantages in the following instances:
• In the case of high process temperatures (→ See also page 24, section "Process temperature limits".)
• In the case of process media that crystallize
• In the case of corrosive process media or process media with solids content
• In the case of heterogeneous and fibrous process media
• If measuring point cleaning is necessary
• The measuring point is exposed to vibration.
• Installation sites that are difficult to access (e.g. better view of display).
Design and operation modeDiaphragm seals separate the measuring system and the process medium.
A diaphragm seal system consists of:
• A diaphragm seal in a one-sided system, e.g. FMD 77 or two diaphragm seals, in a two-sided system, e.g.
FMD 78
• Capillary tube
• Fill fluid and
• A differential pressure transmitter.
The process pressure acts via the diaphragm seal membrane on the liquid-filled system, which transfers the
process pressure via the capillary tube onto the sensor of the differential pressure transmitter.
Endress+Hauser delivers all diaphragm seal systems as welded versions. The system is hermetically sealed,
which ensures the highest reliability.
Note!
The correlations between the individual diaphragm seal components are presented in the following section.
For further information and comprehensive diaphragm seal system designs, please contact Endress+Hauser
Sales.
Diaphragm seal
The diaphragm seal determines the application range of the system by
• the diaphragm diameter
• the diaphragm: stiffness and materials of construction
• the design (oil volume).
Diaphragm diameter
The larger the diaphragm diameter (less stiffness), the smaller the temperature effect on the measurement
result.
Note: When feasible, select diaphragm seals with a nominal diameter of ≥ 3" (DN 80), to reduce temperature
effects within acceptable limits.
Diaphragm stiffness
The stiffness is dependent on the diaphragm diameter, the material, any available coating and on the diaphragm
thickness and shape. The diaphragm thickness and the shape are defined by the limits of the process connection
construction. The stiffness of a diaphragm seal membrane influences the temperature operating range and the
measuring error caused by temperature effects.
Capillary
Diaphragm seals are used with the following capillary internal diameters as standard:
• ≤ 2" (DN 50): 0.04" (1 mm)
• > 2" (DN 50): 0.08" (2 mm)
The capillary tube influences the T
of a diaphragm seal system as a result of its length and internal diameter.
→ See also page 47 ff, sections "Influence of the temperature on the zero point for diaphragm seal
systems", "Ambient temperature range" and "Response time".
→ Observe the installation instructions regarding capillary tubes. See page 50 ff, section "Installation instruc-
tions".
zero point, the ambient temperature operating range and the response time
K
Endress+Hauser45
Page 46
Diaphragm seal filling oils
Deltabar S
Filling oil
When selecting the filling oil, fluid and ambient temperature as well as the operating pressure are of crucial
importance. Pay attention to the temperatures and pressures during commissioning and cleaning. A further
selection criterion is the compatibility of the filling oil with the requirements of the process medium. For this
reason, only filling oils that are non-toxic are used in the food industry, such as vegetable oil or silicone oil.
→ See also the following section "Diaphragm seal filling oils".
The filling oil used influences the TK zero point and the temperature operating range of a diaphragm seal system
and the response time. → See also page 47 ff, sections "Influence of the temperature on the zero point for diaphragm seal systems" and "Response time".
Differential pressure transmitter
The differential pressure transmitter influences the temperature operating range, the T
response time as a result of the volume of its side flange and as a result of its volume change. The volume
change is the volume that has to be shifted to pass through the complete measuring range.
Differential pressure transmitters from Endress+Hauser are optimized with regard to minimum volume change
and side flange.
zero point and the
K
Filling oilPermissible temperature
Silicone oil–40 to +356°F
High-temperature oil +14 to +392°F
Inert oil–40 to +176°F
Vegetable oil,
FDA 21 CFR 172.856
range at
0.7 psi p
(0.05 bar p
(–40 to +180°C)
(–10 to +200°C)
(–40 to +80°C)
+14 to +248°F
(–10 to +120°C)
≤ 14.5 psi p
abs
abs
≤ 1 bar)
Permissible
temperature range at
≥ 14.5 psi p
p
abs
abs
(p
≥ 1 bar)
abs
–40 to +482°F
(–40 to +250°C)
+14 to +662°F
(–10 to +350°C)
–40 to +347°F
(–40 to +175°C)
+14 to +392°F
(–10 to +200°C)
DensityViscosityCoefficient
abs
3
][cSt at
[g/cm
0.961000.000961suitable for foods
0.81300.00070.72high
1.87270.0008760.91Oil for ultra pure
0.949,50.001011.05suitable for foods
77°F/25°C]
of thermal
expansion
[1/K]
correction
T
K
factor
Notes
temperatures
gas and oxygen
applications
46Endress+Hauser
Page 47
Deltabar S
Influence of the temperature on
the zero point for diaphragm
seal systems
A temperature change results in a volume change of the filling oil. The volume change is dependent on the
coefficient of thermal expansion of the filling oil and on the volume of the filling oil at calibration temperature
(+77°F/+25°C , range: +69.8 to 91.4°F/+21 to +33°C). → See also page 46, section "Diaphragm seal filling
oils".
For example, the filling oil expands in the event of a temperature increase. The additional volume presses
against the diaphragm seal membrane. The stiffer a diaphragm is, the greater its return force, which counteracts
a volume change and acts on the measuring cell together with the operating pressure, thus shifting the zero
point. For the "T
The following diagrams display the temperature coefficient "T
Process", see page 37 ff, section "Process connections FMD 78".
K
Ambient" dependent on the capillary length.
K
The following application is displayed: capillary temperature and transmitter temperature (ambient
temperature) change, the process temperature corresponds to the calibration temperature.
The temperature coefficients obtained from the diagrams apply to silicone oil and the membrane material AISI
316L. For other filling oils, these temperature coefficients must be multiplied by the T
corresponding filling oil. For the T
T Ambient
K
[mbar/10 K]
1.4
mbar
10 K
12
10
8
6
4
2
0
01234 5678910
correction factors, see page 46, section "Diaphragm seal filling oils".
K
correction factor of the
K
8
7
6
5
4
3
2
1
Capillary length
[m]
P01-FMD78xxx-05-xx -xx-xx-001
Example for:
– Diaphragm seal versions "B5, EN/DIN Flange DN 80 PN 10-40 B1, AISI 316L"
– Capillary length: 16 ft (5 m)
– Ambient temperature, capillary/transmitter: 113°F (45°C)
– Filling oil: silicone oil
1.Select characteristic curve type for the diaphragm seal versions "B5" in accordance with the following
table.
Result: characteristic curve type 2
2.Obtain value for T
Ambient from the diagram.
K
Result: 1.4 mbar/10 K
3.T
ambient
– T
= 45°C – 25°C = 20°C ⇒ 1.4 mbar/10 K • 20 K = 2.8 mbar
calibration
Result: In this application, the zero point is shifted by 2.8 mbar.
Note!
The influence of temperature on the zero point can be corrected with position calibration.
Filling oil with smaller coefficient of thermal expansion– Observe compatibility of the filling oil with the fluid.
– Observe the filling oil operating limits.
Diaphragm seal with larger diaphragm diameter–
Note!
For further information and comprehensive diaphragm seal system designs, please see your local
Endress+Hauser Sales Center.
Response timeThe viscosity of the filling oil, the capillary length and the capillary internal diameter influence the frictional
resistance. The greater the frictional resistance, the longer the response time.
Furthermore, the volume change of the measuring cell influences the response time. The lower the
volume change of the measuring cell is, the less filling oil has to be shifted in the diaphragm seal system.
The following diagram shows typical response times (T90%) for the various filling oils dependent on the
measuring cell and the capillary internal diameter. The values given are in seconds per metre of capillary length
and must be multiplied by the actual length of the capillary. The rise time of the transmitter must also be taken
into consideration.
Larger capillary internal diameterThe temperature effect increases with increasing diameter.
Shorter capillaries–
Filling oil with lower viscosity– Observe compatibility of the filling oil with the fluid.
Installation instructionsInstructions for diaphragm seal systems
• The diaphragm seal together with the transmitter form a closed, calibrated system, which is filled through
ports in the diaphragm seal and in the measuring system of the transmitter. These ports are sealed and must
not be opened.
• When selecting the measuring cell, observe the zero shift resulting from the hydrostatic pressure of the filling
fluid columns in the capillaries. (→ See the following illustration).
• When using a mounting bracket, sufficient strain relief must be allowed in order to prevent the capillary from
exceeding a bending radius ≥ 4" / 100 mm.
• The temperature and length of both capillaries should be the same when using two-sided diaphragm seal
systems.
1
2
T90%
t
P01-xxxxxxxx-05-xx-xx-xx-006
– Observe the filling oil operating limits.
Selecting the measuring cell (observe the hydrostatic pressure of the filling fluid column in the
capillaries!)
p
i
–
max.
DH=1m
min.
Hu = 0.2 m
Tank with water
= 1.0 kg/dmr
M
+
Capillaries with silicone oil
= 0.96 kg/dmr
Fl
Hv = 1.8 m
H1 = 0.3 m
3
3
+ –
P01-FMD78xxx-11-xx-xx-xx-004.eps
50Endress+Hauser
Page 51
Deltabar S
Pressure on the negative side of the differential pressure transmitter (p–) when the tank is empty (min. level)
p = p + p = Hv•• g + H1 •• g + pρρ
–
Hv
H1
= 1.8 m • 0.96 • 9.81 + 0.3 m • 0.96 • 9.81 + p
= 197.77 mbar + p
Fli
dm
kg
3
m
s
i
Fl
kg
dm
m
3
s
i
Pressure on the positive side of the differential pressure transmitter (P
p = p + p = Hu•• g + H1 •• g + pρρ
Hu
+
H1
= 0.2 m • 1 • 9.81 + 0.3 m • 0.96 • 9.81 + p
= 47.87 mbar + p
kg
dm
M
3
m
s
i
Differential pressure at the transmitter (∆p
i
Fl
kg
dm
) when the tank is empty
Transmitter
3
) when the tank is empty (min. level)
+
m
i
s
Result:
If the tank were full, a differential pressure of –51.80 mbar would be present at the differential pressure transmitter. When
the tank is empty, a differential pressure of –149.90 mbar is present. Therefore, a 500 mbar measuring cell is required for
this application.
Installation instructions
In order to obtain more precise measurement results and to avoid a device failure, mount the capillaries as
follows:
• vibration-free (in order to avoid additional pressure fluctuations)
• not in the vicinity of heating or cooling lines
• insulate at colder or warmer ambient temperatures
• with a bending radius of ≥ 4" (100 mm).
Vacuum applications
For applications under vacuum, Endress+Hauser recommends mounting the pressure transmitter below 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 following illustration on the left must not be exceeded. The maximum height
difference is dependent on the density of the filling oil and the minimum expected pressure that is permitted
to occur at the diaphragm seal on the positive side (empty tank), see the following illustration, on the right.
Endress+Hauser51
Page 52
Deltabar S
46 (14.0)
40 (12.0)
+
–
–
+ –
H1
+
Hight difference H1 ft [m]
33 (10.0)
26 (8.0)
20 (6.0)
13 (4.0)
6.5 (2.0)
0.0
High temperature oil
0.14
(10)
2.9
1.4
(100)
Pressure, diaphragm seal positive side psia [mbar
(200)
4.4
(300)
5.8
(400)
7.3
(500)
Silicone oil
8.7
(600)10(700)
Vegetable oil
Inert oil
11.6
(800)13(900)
14.5
(1000)
]
abs
P01-FMD7xxxx-11-xx-xx-xx-001
Installation above the lower diaphragm seal
Diagram of maximum installation height above the lower diaphragm
P01-FMD7xxxx-05-xx-xx-xx-000
seal for vacuum applications dependent on the pressure at the
diaphragm seal on the positive side
Certificates and approvals
CE markThe device meets the legal requirements of the relevant EC directives. Endress+Hauser confirms that the
device has been successfully tested by applying the CE mark.
Hazardous area approvalsAll 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.
→ See also page 67 ff, sections "Safety Instructions" and "Installation/Control Drawings".
Pressure Equipment Directive
(PED)
Overspill protectionOverspill protection: WHG
Standards and guidelinesDIN EN 60770 (IEC 60770):
– This measuring device corresponds to Article 3 (3) of the EC directive 97/23/EC (Pressure Equipment
Directive) and has been designed and manufactured according to good engineering practice.
– FMD 78 with pipe diaphragm seal ≥ 1.5"/PN40:
Suitable for stable gases in group 1, category II
– PMD 75, PN 420
Suitable for stable gases in group 1, category I
Transmitters for use in industrial-process control systems
Part 1: Methods for inspection and routine testing
DIN 16086:
Electrical pressure measuring instruments, pressure sensors, pressure transmitters, pressure measuring
instruments, concepts, specifications in data sheets
EN 61326:
Electrical equipment for measurement, control and laboratory use – EMC requirements
EN 61000-4-5:
Electromagnetic compatibility (EMC) –
Part 4: Testing and measurement techniques; Main section 5: Surge immunity test
52Endress+Hauser
Page 53
Deltabar S
Ordering information
PMD 70
1
T15
10Certificates
A For non-hazardous areas
1 ATEX II 1/2 G EEx ia IIC T6
6 ATEX II 1/2 G EEx ia IIC T6, overspill protection WHG
2 ATEX II 1/2 D
3 ATEX II 1/2 GD EEx ia IIC T6
4 ATEX II 1/3 D
7 ATEX II 3 G EEx nA II T6
S FM IS, Class I, II, III Division 1, Groups A – G; NI Class I Division 2, Groups A – D; AEx ia
Q FM DIP, Class II, III Division 1, Groups E – G
R FM NI, Class I, Division 2, Groups A – D
U CSA IS, Class I, II, III Division 1, Groups A – G; Class I Division 2, Groups A – D, Ex ia
W CSA Class II, III Division 1, Groups E – G (Dust-Ex)
20Electronics, communication, display, operation
2
3
Display
Sensor
Histo
ROM
PC
2
1
[]
Damping
on
off
A 4 to 20 mA, HART, LCD, external push buttons (→ see Fig. 1, 2)
B 4 to 20 mA, HART, LCD (→ see Fig. 1, 3)
C 4 to 20 mA, HART (→ see Fig. 3)
M PROFIBUS PA, LCD, external push buttons (→ see Fig. 1, 2)
N PROFIBUS PA, LCD (→ see Fig. 1, 3)
OPROFIBUS PA (→ see Fig. 3)
P Foundation Fieldbus, LCD, external push buttons (→ see Fig. 1, 2)
Q Foundation Fieldbus, LCD (→ see Fig. 1, 3)
R Foundation Fieldbus (→ see Fig. 3)
30Housing, Cable entry, Protection
A Aluminum T14 housing, optional side-mount display, M 20x1,5, IP 66/67/NEMA 6P
B Aluminum T14 housing, optional side-mount display, G 1/2, IP 66/67/NEMA 6P
C Aluminum T14 housing, optional side-mount display, 1/2" NPT, IP 66/67/NEMA 6P
D Aluminum T14 housing, optional side-mount display, M 12x1 PA plug, IP66/67/NEMA 6P
E Aluminum T14 housing, optional side-mount display, 7/8" FF plug, IP 66/67/NEMA 6P