Pressure transducer with ceramic and metal
sensors
Application
The Cerabar is a pressure transducer for the measurement of absolute and gauge
pressure in gases, vapors, liquids and dust. The Cerabar can be used internationally
thanks to a wide range of approvals and process connections.
Your benefits
• High reproducibility and long-term stability
• Reference accuracy: up to 0.3%
• Customized measuring ranges
– Turn down up to 5:1
– Sensor for measuring ranges up to 400 bar (6000 psi)
• Housing and process isolating diaphragm made of 316L
Table of contents
Cerabar PMC11, PMC21, PMP11, PMP21
Document information ....................... 4
Document function ............................ 4
Symbols used ................................ 4
Documentation ............................... 5
Terms and abbreviations ........................ 6
Turn down calculation .......................... 7
Function and system design ................... 8
Measuring principle - process pressure measurement ..... 8
Measuring system ............................. 8
Device features ............................... 9
Product design .............................. 11
System integration ........................... 12
Input .................................... 13
Measured variable ............................ 13
Measuring range ............................ 13
Output .................................. 16
Output signal ............................... 16
Signal range 4 to 20 mA ........................ 16
Load (for 4 to 20 mA devices ) .................... 16
Load resistance (for 0 to 10 V devices) .............. 16
Signal on alarm 4 to 20 mA ...................... 16
Dead time, time constant ....................... 16
Dynamic behavior ............................ 17
Power supply ............................. 18
Terminal assignment .......................... 18
Supply voltage .............................. 18
Current consumption and alarm signal .............. 18
Power supply fault ............................ 19
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 usedSafety symbols
SymbolMeaning
Electrical symbols
SymbolMeaningSymbolMeaning
DANGER!
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
NOTICE!
This symbol contains information on procedures and other facts which do not result in
personal injury.
Protective ground connection
A terminal which must be connected
to ground prior to establishing any
other connections.
Ground connection
A grounded terminal which, as far as
the operator is concerned, is
grounded via a grounding system.
Symbols for certain types of information
SymbolMeaning
Permitted
Procedures, processes or actions that are permitted.
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information.
Reference to documentation
Reference to page
Reference to graphic
Visual inspection
Symbols in graphics
SymbolMeaning
1, 2, 3 ...Item numbers
Series of steps
A, B, C, ...Views
4Endress+Hauser
Cerabar PMC11, PMC21, PMP11, PMP21
Documentation
The document types listed are available:
In the Download Area of the Endress+Hauser Internet site: www.endress.com → Download
Brief Operating Instructions (KA): getting the 1st measured value quickly
These instructions contain all the essential information from incoming acceptance to initial
commissioning.
Operating Instructions (BA): your comprehensive reference
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.
Safety Instructions (XA)
Depending on the approval, the following Safety Instructions (XA) are supplied with the device. They
are an integral part of the Operating Instructions.
DeviceDirectiveDocumentationOption
PMP21ATEX II 1/2G Ex ia IIC T4 Ga/GbXA01271PBA
PMC21ATEX II 2G Ex ia IIC T4 GbXA01271PBB
PMC21
PMP21
PMC21
PMP21
PMC21
PMP21
PMC21
PMP21
PMC21
PMP21
PMC21
PMP21
PMC21
PMP21
ATEX II 3G Ex ec IIC T4 GcXA01533PBC
FM IS Cl. I, Div.1 Gr. A-D T4XA01321PFA
CSA C/US IS Cl. I Div. 1 Gr. A-DXA01322PCB
EAC Ex ia IIC T4 Ga/GbXA01540PGA
IEC Ex ia IIC T4 Ga/GbXA01271PIA
NEPSI Ex ia IIC T4XA01363PNA
TIIS Ex ia IIC T4In preparationTA
1)
1)Product Configurator order code for "Approval"
The nameplate indicates the Safety Instructions (XA) that are relevant to the device.
Endress+Hauser5
Terms and abbreviations
URLOPLMWP
LRL
0
p
LRV
URV
1
2
3
4
Cerabar PMC11, PMC21, PMP11, PMP21
A0029505
Item Term/
abbreviation
1OPLThe OPL (over pressure limit = sensor overload limit) for the measuring device
2MWPThe MWP (maximum working pressure) for the sensors depends on the lowest-
3Maximum sensor
measuring range
4Calibrated/
adjusted span
p-Pressure
-LRLLower range limit
-URLUpper range limit
-LRVLower range value
-URVUpper range value
-TD (turn down)Turn down
Explanation
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 notes, see the "Pressure specifications" section
→ 28 .
The OPL may only be applied for a limited period of time.
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 notes, see the "Pressure specifications" section → 28 .
The MWP may be applied at the device for an unlimited period.
The MWP can also be found on the nameplate.
Span between LRL and URL
This sensor measuring range is equivalent to the maximum calibratable/adjustable
span.
Span between LRV and URV
Factory setting: 0 to URL
Other calibrated spans can be ordered as customized spans.
The turn down is preset at the factory and cannot be changed.
Example - see the following section.
• Calibrated/adjusted span: 0 to 5 bar (0 to 75 psi)
• Lower range value (LRV) = 0 bar (0 psi)
• Upper range value (URV) = 5 bar (75 psi)
TD =
URL
|URV-LRV|
10 bar (150 psi)
TD =
|5 bar (75 psi)-0 bar (0 psi)|
In this example, the TD is 2:1.
This span is based on the zero point.
= 2
Endress+Hauser7
Function and system design
1
2
3
4
p
p
1
3
4
2
Cerabar PMC11, PMC21, PMP11, PMP21
Measuring principle process 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
– High mechanical durability
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 high process pressures
• Fully welded sensor
• Slim, flush-mounted process connections available
A0016448
1Silicon measuring element, substrate
2Wheatstone bridge
3Channel with fill fluid
4Metal process isolating diaphragm
PMC21 0+0.1 (+1.5)0.1 (1.5)2.7 (40.5)4 (60)0 to 100 mbar (0 to 1.5 psi)2C
6)
PMC21 0+0.25 (+4)0.25 (4)3.3 (49.5)5 (75)0 to 250 mbar (0 to 4 psi)2E
6)
PMC21 0+0.4 (+6)0.4 (6)5.3 (79.5)8 (120)0 to 400 mbar (0 to 6 psi)2F
6)
6)
6)
PMC21 0+1 (+15)0.4 (6)6.7 (100.5)10 (150)0 to 1 bar (0 to 15 psi)2H
PMC21 0+2 (+30)0.4 (6)12 (180)18 (270)0 to 2 bar (0 to 30 psi)2K
PMC21 0+4 (+60)0.8 (12)16.7 (250.5) 25 (375)0 to 4 bar (0 to 60 psi)2M
6)
PMC21 0+10 (+150)2 (30)26.7 (400.5) 40 (600)0 to 10 bar (0 to 150 psi)2P
6)
PMC21 0+40 (+600)8 (120)40 (600)60 (900)0 to 40 bar (0 to 600 psi)2S
1)Highest turn down that can be set at the factory: 5:1. The turn down is preset and cannot be changed.
2)Other measuring ranges (e.g. –1 to +5 bar (–15 to 75 psi)) can be ordered with customer-specific settings (see the Product Configurator, order
code for "Calibration; Unit" option "J"). It is possible to invert the output signal (LRV = 20 mA; URV = 4 mA). Prerequisite: URV < LRV
3)Product Configurator, order code for "Sensor range"
4)Vacuum resistance: 0.7 bar (10.5 psi) abs
5)Vacuum resistance: 0.5 bar (7.5 psi) abs
6)Vacuum resistance: 0 bar (0 psi) abs
3)
Maximum turn down which can be ordered for absolute pressure and gauge pressure sensors
Devices for gauge pressure measurement
• 6 bar (90 psi), 16 bar (240 psi), 25 bar (375 psi): TD 1:1 to TD 2.5:1
• All other measuring ranges: TD 1:1 to TD 5:1
Devices for absolute pressure measurement
–0.4 (–6)+0.4 (+6)0.4 (6)1 (15)1.6 (24)0 to 400 mbar (0 to 6 psi)1F
PMP21
1 bar (15 psi)
4)
PMP11
–1 (–15)+1 (+15)0.4 (6)2.7 (40.5)4 (60)0 to 1 bar (0 to 15 psi)1H
PMP21
2 bar (30 psi)
4)
PMP11
–1 (–15)+2 (+30)0.4 (6)6.7 (100.5)10 (150)0 to 2 bar (0 to 30 psi)1K
PMP21
4 bar (60 psi)
4)
PMP11
–1 (–15)+4 (+60)0.8 (12)10.7 (160.5) 16 (240)0 to 4 bar (0 to 60 psi)1M
PMP21
6 bar (90 psi)
4)
PMP11
–1 (–15)+6 (+90)2.4 (36)16 (240)24 (360)0 to 6 bar (0 to 90 psi)1N
PMP21
10 bar (150 psi)
4)
PMP11
–1 (–15)+10 (+150)2 (30)25 (375)40 (600)0 to 10 bar (0 to 150 psi)1P
PMP21
16 bar (240 psi)
4)
PMP11
–1 (–15)+16 (+240)5 (75)25 (375)64 (960)0 to 16 bar (0 to 240 psi)1Q
PMP21
25 bar (375 psi)
4)
PMP11
–1 (–15)+25 (+375)5 (75)25 (375)100 (1500) 0 to 25 bar (0 to 375 psi)1R
PMP21
40 bar (600 psi)
4)
PMP11
–1 (–15)+40 (+600)8 (120)100 (1500)160 (2400) 0 to 40 bar (0 to 600 psi)1S
PMP21
100 bar (1500 psi)
400 bar (6000 psi)
4)
PMP21 –1 (–15)+100 (+1500) 20 (300)100 (1500)160 (2400) 0 to 100 bar (0 to 1500 psi)1U
4)
PMP21 –1 (–15)+400 (+6000) 80 (1200)400 (6000)600 (9000) 0 to 400 bar (0 to 6000 psi)1W
Devices for absolute pressure measurement
400 mbar (6 psi)
1 bar (15 psi)
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
40 bar (600 psi)
100 bar (1500 psi)
400 bar (6000 psi)
4)
PMP21 0 (0)0.4 (+6)0.4 (6)1 (15)1.6 (24)0 to 400 mbar (0 to 6 psi)2F
4)
4)
4)
PMP21 0 (0)1 (+15)0.4 (6)2.7 (40.5)4 (60)0 to 1 bar (0 to 15 psi)2H
PMP21 0 (0)2 (+30)0.4 (6)6.7 (100.5)10 (150)0 to 2 bar (0 to 30 psi)2K
PMP21 0 (0)4 (+60)0.8 (12)10.7 (160.5) 16 (240)0 to 4 bar (0 to 60 psi)2M
4)
PMP21 0 (0)10 (+150)2 (30)25 (375)40 (600)0 to 10 bar (0 to 150 psi)2P
4)
PMP21 0 (0)+40 (+600)8 (120)100 (1500)160 (2400) 0 to 40 bar (0 to 600 psi)2S
4)
PMP21 0 (0)+100 (+1500) 20 (300)100 (1500)160 (2400) 0 to 100 bar (0 to 1500 psi) 2U
4)
PMP21 0 (0)+400 (+6000) 80 (1200)400 (6000)600 (9000) 0 to 400 bar (0 to 6000 psi) 2W
Lowest
calibratable
1)
span
MWPOPLFactory settings
2)
Option
3)
1)Highest turn down that can be set at the factory: 5:1. The turn down is preset and cannot be changed.
2)Other measuring ranges (e.g. –1 to +5 bar (–15 to 75 psi)) can be ordered with customer-specific settings (see the Product Configurator, order
code for "Calibration; Unit" option "J"). It is possible to invert the output signal (LRV = 20 mA; URV = 4 mA). Prerequisite: URV < LRV
3)Product Configurator, order code for "Sensor range"
4)Vacuum resistance: 0.01 bar (0.145 psi) abs
Maximum turn down which can be ordered for absolute pressure and gauge pressure sensors
DeviceRange400 mbar (6 psi)1 bar (15 psi)
6 bar (90 psi)
16 bar (240 psi)
PMP110.5%TD 1:1TD 1:1 to TD 2.5:1TD 1:1 to TD 5:1
PMP210.3%TD 1:1TD 1:1 to TD 2.5:1TD 1:1 to TD 5:1
2 bar (30 psi)
4 bar (60 psi)
10 bar (150 psi)
25 to 400 bar (375 to 6000 psi)
Endress+Hauser15
Output
[ ]W
30
20
10
1068
614
U
[V]
1
R
L
max
B
2
R
L
max
£
-U6.5V
22mA
B
I
63 %
100 %
t
t1t
2
90 %
t
3
Cerabar PMC11, PMC21, PMP11, PMP21
Output signal
Signal range 4 to 20 mA
Load (for 4 to 20 mA
devices )
DesignationOption
4 to 20 mA (2-wire)1
PMC11: 0 to 10 V output (3-wire)
PMP11: 0 to 10 V output (3-wire)
1)Product Configurator, order code for "Output"
1)
2
3.8 mA to 20.5 mA
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 UB of the supply
unit.
A0029452
1Power supply 10 to 30 V DC
2R
UBSupply voltage
Maximum load resistance
Lmax
L
Load resistance (for 0 to 10 V
devices)
Signal on alarm 4 to 20 mA
Dead time, time constant
The load resistance must be ≥ 5 [kΩ].
The response of the output to error is regulated in accordance with NAMUR NE43.
Factory setting MAX alarm: >21 mA
alarm current
DeviceDescriptionOption
PMC21
PMP21
1)Product Configurator order code for "Service"
Adjusted min. alarm currentIA
Presentation of the dead time and the time constant:
1)
A0019786
16Endress+Hauser
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