KA01031P/00/EN/06.21-00
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2021-09-30

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Brief Operating Instructions
Cerabar M PMC51, PMP51,
PMP55
Process pressure measurement
PROFIBUS PA
Pressure transmitter with ceramic and metallic
measuring cells

These Brief Operating Instructions are not a substitute for the
Operating Instructions pertaining to the device.
Detailed information about the device can be found in the
Operating Instructions and the additional documentation.
Available for all device versions via• Internet: www.endress.com/deviceviewer• Smartphone/tablet: Endress+Hauser Operations app

Associated documentation

1

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

Associated documentation

1.

Order code: XXXXX-XXXXXX
Ser. no.:XXXXXXXXXXXX
Ext. ord. cd.: XXX.XXXX.XX

Serial number

2. www.endress.com/deviceviewer

Endress+Hauser
Operations App

3.

A0023555

2

About this document

2.1

Document function

The Brief Operating Instructions contain all the essential information from incoming
acceptance to initial commissioning.

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Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

2.2

Symbols used

2.2.1

Safety symbols

About this document

DANGER

This symbol alerts you to a dangerous situation. Failure to avoid this situation will result inserious or fatal injury.
WARNING

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result inserious or fatal injury.
CAUTION

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result inminor or medium injury.
NOTICE

This symbol contains information on procedures and other facts which do not result inpersonal injury.
2.2.2

Electrical symbols

Protective earth (PE)Ground terminals that must be connected to ground prior to establishing any otherconnections.
The ground terminals are located on the interior and exterior of the device:• Interior ground terminal: protective earth is connected to the mains supply.
• Exterior ground terminal: device is connected to the plant grounding system.
2.2.3

Symbols for certain types of information and graphics

Symbols for certain types of information and graphics
Permitted
Procedures, processes or actions that are permitted
Forbidden
Procedures, processes or actions that are forbidden
Tip
Indicates additional information
Reference to documentationA

Reference to page
Visual inspection
Notice or individual step to be observed

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3

Basic safety instructions

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

1, 2, 3, ...
Item numbers
1. , 2. , 3.
Series of steps

Result of a step

2.3

Registered trademarks• KALREZ®
Registered label of E.I. Du Pont de Nemours & Co., Wilmington, USA• TRI-CLAMP®
Registered label of Ladish & Co., Inc., Kenosha, USA• PROFIBUS PA®
Trademark of the PROFIBUS User Organization, Karlsruhe, Germany• GORE-TEX® trademark of W.L. Gore & Associates, Inc., USA

3

Basic safety instructions

3.1

Requirements for the personnel

Personnel must meet the following requirements for their tasks:‣ Trained, qualified specialists must be suitably qualified to perform this function and task
‣ Are authorized by the plant owner/operator‣ Are familiar with federal/national regulations‣ They must have read and understood the instructions in the manual, supplementary
documentation and certificates (depending on the application) prior to starting work
‣ They must follow instructions and comply with basic conditions

3.2

Intended use

The Cerabar M is a pressure transmitter for measuring level and pressure.
3.2.1

Foreseeable incorrect use

The manufacturer is not liable for damage caused by improper or non-intended use.
Verification for borderline cases:‣ For special fluids and fluids for cleaning, Endress+Hauser is glad to provide assistance inverifying the corrosion resistance of fluid-wetted materials, but does not accept any
warranty or liability.

3.3

Workplace safety

For work on and with the device:‣ Wear the required personal protective equipment according to federal/national
regulations.

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Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

Basic safety instructions‣ Switch off the supply voltage before connecting the device.

3.4

Operational safety

Risk of injury!
‣ Operate the device in proper technical condition and fail-safe condition only.
‣ The operator is responsible for interference-free operation of the device.
Conversions to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers:‣ If, despite this, modifications are required, consult with Endress+Hauser.
RepairTo ensure continued operational safety and reliability:‣ Carry out repairs on the device only if they are expressly permitted.
‣ Observe federal/national regulations pertaining to repair of an electrical device.
‣ Use original spare parts and accessories from Endress+Hauser only.
Hazardous area
To eliminate a danger for persons or for the facility when the device is used in the hazardous
area (e.g. explosion protection, pressure vessel safety):‣ Based on the nameplate, check whether the ordered device is permitted for the intended
use in the hazardous area.
‣ Observe the specifications in the separate supplementary documentation that is an integral
part of these Instructions.

3.5

Product safety

This measuring device is designed in accordance with good engineering practice to meet stateof-the- art safety requirements, has been tested, and left the factory in a condition in which
they are safe to operate.
It fulfills general safety requirements and legal requirements. It also conforms to the EC
directives listed in the device-specific EC declaration of conformity. Endress+Hauser confirms
this fact by applying the CE mark.

Endress+Hauser

5Incoming acceptance and product identification

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

4

Incoming acceptance and product identification

4.1

Incoming acceptance

DELIVERY NOTE

1=2

A0016870• Is the order code on the delivery note (1) identical to the order code on the product sticker(2)?
• Are the goods undamaged?
• Do the data on the nameplate correspond to the order specifications and the delivery note?
• Is the documentation available?
• If required (see nameplate): Are the safety instructions (XA) present?
If one of these conditions is not fulfilled, please contact your Endress+Hauser sales office.

4.2

Storage and transport

4.2.1

Storage conditions

Use original packaging.
Store the measuring device in clean and dry conditions and protect from damage caused byshocks (EN 837-2).
4.2.2

Transporting the product to the measuring point

LWARNING
Incorrect transport!
Housing and membrane may become damaged, and there is a risk of injury!
‣ Transport the measuring device to the measuring point in its original packaging or by theprocess connection.
‣ Follow the safety instructions and transport conditions for devices weighing more than 18
kg (39.6 lbs).
‣ Do not use capillaries as a carrying aid for the diaphragm seals.

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Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

5

Mounting

5.1

Mounting requirements

5.1.1

General installation instructions

Mounting• Devices with a G 1 1/2 thread:
When screwing the device into the tank, the flat seal has to be positioned on the sealing
surface of the process connection. To avoid additional strain on the process membrane, thethread should never be sealed with hemp or similar materials.
• Devices with NPT threads:• Wrap Teflon tape around the thread to seal it.
• Tighten the device at the hexagonal bolt only. Do not turn at the housing.
• Do not overtighten the thread when screwing. Max. tightening torque:
20 to 30 Nm (14.75 to 22.13 lbf ft)• For the following process connections, a tightening torque of max. 40 Nm (29.50 lbf ft) is
specified:• Thread ISO228 G1/2 (Order option "GRC" or "GRJ" or "G0J")• Thread DIN13 M20 x 1.5 (Order option "G7J" or "G8J")
5.1.2

Mounting sensor modules with PVDF thread

LWARNING
Risk of damage to process connection!
Risk of injury!
‣ Sensor modules with PVDF thread must be installed with the mounting bracket provided!
LWARNING
Material fatigue from pressure and temperature!
Risk of injury if parts burst! The thread can become lose if exposed to high pressure andtemperature loads.
‣ The integrity of the thread must be checked regularly. Also, the thread may need to be retightened with the maximum tightening torque of 7 Nm (5.16 lbf ft). Teflon tape isrecommended for sealing the ½" NPT thread.

5.2

Installation instructions for devices without diaphragm seals –PMP51, PMC51

NOTICE
Damage to the device!
If a heated device is cooled during a cleaning process (e.g. by cold water), a vacuum develops
for a short time and, as a result, moisture can enter the sensor through the pressurecompensation element (1).
‣ Mount the device as follows.

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Mounting

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

1

1
1

1
A0028471• Keep the pressure compensation and GORE-TEX® filter (1) free from contamination.
• Cerabar M transmitters without diaphragm seals are mounted as per the norms for amanometer (DIN EN 837-2). We recommend the use of shutoff devices and water pocket
pipes. The orientation depends on the measuring application.
• Do not clean or touch process membranes with hard or pointed objects.
• The device must be installed as follows in order to comply with the cleanability
requirements of the ASME-BPE (Part SD Cleanability):

A0028472

5.2.1

Pressure measurement in gases

Mount the Cerabar M with the shutoff device above the tapping point so that any condensate
can flow into the process.

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Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

5.2.2

Mounting

Pressure measurement in vapors• Mount the Cerabar M with the water pocket pipe below the tapping point.
• Fill the water pocket pipe with liquid before commissioning. The water pocket pipe reduces
the temperature to almost ambient temperature.
5.2.3

Pressure measurement in liquids

Mount the Cerabar M with the shutoff device below or at the same level as the tapping point.

5.3

Installation instructions for devices with diaphragm seals –PMP55• Cerabar M devices with diaphragm seals are screwed in, flanged or clamped, depending on
the type of diaphragm seal.
• 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.
• Do not clean or touch the process membrane of the diaphragm seal with hard or pointed
objects.
• Do not remove the protection on the process membrane until just before installation.
NOTICE
Incorrect handling!
Damage to the device!
‣ A diaphragm seal and the pressure transmitter together form a closed, oil-filled calibrated
system. The fill fluid hole is sealed and may not be opened.
‣ If a mounting bracket is used, sufficient strain relief must be ensured for the capillaries inorder to prevent them from buckling (bending radius ≥ 100 mm (3.94 in)).
‣ Please observe the application limits of the diaphragm seal filling oil as detailed in theTechnical Information for Cerabar M TI00436P, "Planning instructions for diaphragm seal
systems" section.
NOTICE
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 or above the reference temperature‣ Mount with a bending radius ≥ 100 mm (3.94 in)!
‣ Do not use the capillaries as a carrying aid for the diaphragm seals!

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9Electrical connection

6

Electrical connection

6.1

Connecting requirements

6.1.1

Shielding/potential equalization

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA• You achieve optimum shielding against disturbances if the shielding is connected on bothsides (in the cabinet and on the device). If potential equalization currents are expected in
the plant, only ground shielding on one side, preferably at the transmitter.
• When using in hazardous areas, you must observe the applicable regulations.
Separate Ex documentation with additional technical data and instructions is included with
all Ex systems as standard. Connect all devices to the local potential equalization.

6.2

Connecting the device

LWARNING
Supply voltage might be connected!
Risk of electric shock and/or explosion!
‣ Ensure that no uncontrolled processes are activated at the facility.
‣ Switch off the supply voltage before connecting the device.
‣ When using the measuring device in hazardous areas, installation must also comply withthe applicable national standards and regulations and the Safety Instructions or
Installation or Control Drawings.
‣ In accordance with IEC/EN61010 a suitable circuit breaker must be provided for the device.
‣ Devices with integrated overvoltage protection must be grounded.
‣ Protective circuits against reverse polarity, HF influences and overvoltage peaks areintegrated.
Connect the device in the following order:
1.

Check whether the supply voltage matches the supply voltage indicated on the
nameplate.

2.

Switch off the supply voltage before connecting the device.

3.

Remove the housing cover.

4.

Guide the cable through the gland. Preferably use a twisted, shielded two-wire cable.

5.

Connect the device as indicated in the following diagram.

6.

Screw down the housing cover.

7.

Switch on the supply voltage.

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Electrical connection

1

1

4

- +
2

3
A0029967

1
2
3
4

External ground terminal
Grounding terminal
PROFIBUS PA: Supply voltage: 9...32 VDC (Segment coupler)
Terminals for supply voltage and signal

6.2.1

Connecting the cable version (all device versions)
+
–

+

–
PE
1

2

3

4
A0019991

1234RD = red
BK = black
GNYE = green
4 to 20 mA

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11Electrical connection

6.2.2

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

Connection of devices with M12 plug

4

3

1

2

A0011175

1
2
3
4

Signal +Not assigned
Signal –Ground6.2.3

Supply voltage

PROFIBUS PA
Version for non-hazardous areas: 9 to 32 V DC
6.2.4

Current consumption

11 mA ±1 mA, switch-on current corresponds to IEC 61158-2, Clause 21.
6.2.5

Terminals• Supply voltage and internal ground terminal: 0.5 to 2.5 mm2 (20 to 14 AWG)
• External ground terminal: 0.5 to 4 mm2 (20 to 12 AWG)
6.2.6

Cable specification

PROFIBUS PA• Use a twisted, shielded two-wire cable, preferably cable type A.
• Cable outer diameter: 5 to 9 mm (0.2 to 0.35 in) depending on the cable gland used
For further information on the cable specifications, see Operating Instructions
BA00034S "PROFIBUS DP/PA: Guidelines for planning and commissioning", the PNO
Guideline 2.092 "PROFIBUS PA User and Installation Guideline" and IEC 61158-2 (MBP).

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Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

Operation options

7

Operation options

7.1

Operation without an operating menu

Operation options

Explanation

Graphic

Local operation
The device is operated using the operating
without device display keys and the DIP switches on the electronic
insert.

Description→  13
Zero

Display

12
damp
not used 3
off:SW 4
delta p on:Ö
only on:P2=High off:SW 5

on
off
SW

on
off

HW
Address

A0029997

7.1.1

Position of operating elements

The operating key and DIP switches are located on the electronic insert in the device.
PROFIBUS PA

on
Display

3
1
2
damp
not used 3
off:SW 4
delta p on:Ö
only on:P2= High off:SW 5

1

2

on
off
SW

on
off

HW
Address

3

4

5

off

SW /
SW / P2=High

Zero

damping2
1

10 9 8 7 654A0032659

1
2
3
4
5
6
7
8
9
10

Green LED to indicate successful operation
Operating key for position zero adjustment (Zero) or reset
Slot for optional local display
DIP-switch for bus address SW / HW
DIP-switch for hardware address
DIP switch only for Deltabar M
DIP switch only for Deltabar M
Not used
DIP switch for switching damping on/off
DIP switch for locking/unlocking parameters relevant to the measured value

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Operation options

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

Function of the DIP switches
Symbol/labeling Switch position
"off"

"on"

The device is unlocked. Parameters relevant to
the measured value can be modified.

The device is locked. Parameters relevant to themeasured value cannot be modified.

damping τ

Damping is switched off. The output signal
follows measured value changes without any
delay.

Damping is switched on. The output signal
follows measured value changes with the delay
time t. 1)

Address

Set the device address using switches 1-7

SW / HW

Hardware addressing

A00119781)

Software addressing

The value for the delay time can be configured via the operating menu ("Setup" → "Damping"). Factory setting: τ =2 s or as per order specifications.

Function of the operating elements
Key

MeaningZero pressed for at least 3
seconds

Position adjustment
Press key for at least 3 seconds. The LED on the electronic insert lights up briefly if
the pressure applied has been accepted for position adjustment. See also thefollowing Section "Performing position adjustment on site.''Zero pressed for at least 12
seconds

Reset
All the parameters are reset to the order configuration.

Performing position adjustment on site
• Operation must be unlocked.
• The device is configured for the "Pressure" measuring mode (Cerabar, Deltabar) or "Level"measuring mode (Deltapilot) as standard.
• The pressure applied must be within the nominal pressure limits of the sensor. See
information on the nameplate.
Perform position adjustment:
1.

Pressure is present at the device.

2.

Press key for at least 3 seconds.

3.

If the LED on the electronic insert lights up briefly, the pressure applied has been
accepted for position adjustment. If the LED does not light up, the pressure applied was
not accepted. Observe the input limits. For error messages see the Operating
Instructions.

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7.2

Operation options

Operation with device display (optional)

A 4-line liquid crystal display (LCD) is used for display and operation. The local display shows
measured values, dialog texts, fault messages and notice messages. For easy operation thedisplay can be taken out of the housing (see figure steps 1 to 3). It is connected to the device
via a cable that is 90 mm (3.54 in) long. The display of the device can be turned in 90° stages(see figure steps 4 to 6). Depending on the installation position of the device, this makes it
easy to operate the device and read the measured values.

1.

2.

3.

4.

5.

6.

A0028500

Functions:• 8-digit measured value display including sign and decimal point.
• Bar graph as graphic display of the standardized value of the Analog Input Block ( "Scaling
the output value (OUT Value)", figure)• Three keys for operation• Simple and complete menu guidance due to breakdown of parameters into several levels
and groups• Each parameter is given a 3-digit parameter code for easy navigation• Possibility of configuring the display to suit individual requirements and preferences, e.g.
language, alternating display, display of other measured values such as sensor temperature,contrast setting• Comprehensive diagnostic functions (fault and warning message etc.)

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Operation options

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

2

F

3

1
4
–

+

E

6

7

5
A0030013

1
2
3
4
5
6
7

Main line
Value
SymbolUnit
Bar graph
Information line
Operating keys

The following table illustrates the symbols that can appear on the local display. Four symbols
may appear at the same time.
SymbolMeaning
Lock symbol
The operation of the device is locked. Unlock the device, .

A0018154

Communication symbol
Data transfer via communication
A0018155

Error message "Out of specification"
The device is being operated outside its technical specifications (e.g. during startup or cleaning).
A0013958

Error message "Service mode"
The device is in the service mode (e.g. during a simulation).
A0013959

Error message "Maintenance required"
Maintenance is required. The measured value remains valid.
A0013957

Error message "Failure detected"
An operating error has occurred. The measured value is no longer valid.
A0013956

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7.2.1

Operation options

Operating keys on the display and operating module

Operating key(s)Meaning• Navigate down in the picklist• Edit the numerical values or characters within a function

A0017879• Navigate up in the picklist• Edit the numerical values or characters within a function
A0017880• Confirm entry• Jump to the next item
• Select a menu item and activate the edit mode

A0017881

Contrast setting of local display: darker
andA0017879

A0017881

Contrast setting of local display: brighter
andA0017880

A0017881

and
A0017879

7.2.2

A0017880

ESC functions:• Exit edit mode for a parameter without saving the changed value• You are in a menu at a selection level. Each time you press the keys simultaneously, you go
up a level in the menu.

Operating example: Parameters with a picklist

Example: selecting "Deutsch" as the language of the menu.
Language1  English
Deutsch2

Deutsch000 Operation"English" is set as the menu language (default value).
A  in front of the menu text indicates the option that is currently active.

Select "Deutsch" with  or .

 English
3  Deutsch
English7.2.3• Select  to confirm. A  in front of the menu text indicates the active option ("Deutsch" is
now selected as the menu language).
• Use  to exit the edit mode for the parameter.

Operating example: User-definable parameters

Example: Setting the "Set URV (014)" parameter from 100 mbar (1.5 psi) to
50 mbar (0.75 psi).

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Operation options

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

Menu path: Setup → Extended setup → Current output → Set URV
Set URV

014

Operation

1

1 0 0

. 0 0 0mbar

The local display shows the parameter to be changed. The "mbar" unit isdefined in another parameter and cannot be changed here.

2

1 0 0

. 0 0 0mbar

Press  or  to enter the edit mode.
The first digit is highlighted in black.

3

5 0 0

. 0 0 0

mbar

4

5 0 0

. 0 0 0mbar

5

5 0 ¿ . 0 0 0

mbar

Use the  key to change to the " " symbol.
Use  to save the new value and exit the edit mode. See next graphic.

6

5 0 .

mbar

The new value for the upper range value is 50 mbar (0.75 psi).
Use  to exit the edit mode for the parameter.
Use  or  to return to the edit mode.

7.2.4

0 0 0

Use the  key to change "1" to "5".
Press the  key to confirm "5". The cursor jumps to the next position(highlighted in black).
Confirm "0" with  (second position).
The third digit is highlighted in black and can now be edited.

Operating example: Accepting the pressure present

Example: Setting position adjustment.
Menu path: Main menu → Setup → Position adjustment
Position adjustment
1  Cancel

007 Operation
The pressure for position adjustment is present at the device.

Confirm
2

Cancel Confirm

3

Adjustment has
been accepted!

4  Cancel

Use  or  to switch to the "Confirm" option. The active option is highlighted inblack.

Use the  key to accept the applied pressure for position adjustment. The device
confirms the adjustment and goes back to the "Position adjustment" parameter.
Use  to exit the edit mode for the parameter.

Confirm

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Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

8Commissioning

Commissioning

The device is configured for the "Pressure" measuring mode as standard.
The measuring range and the unit in which the measured value is transmitted correspond to
the data on the nameplate.

LWARNING
The permitted process pressure is exceeded!
Risk of injury if parts burst! Warnings are displayed if the pressure is too high.
‣ If a pressure smaller than the minimum permitted pressure or greater than the maximum
permitted pressure is present at the device, the following messages are output insuccession (depending on the setting in the "Alarm behavior" (050) parameter): "S140
Working range P" or "F140 Working range P" "S841 Sensor range" or "F841 Sensor range""S971 Adjustment"‣ Only use the device within the sensor range limits!
NOTICEThe permitted process pressure is undershot!
Messages are displayed if the pressure is too low.
‣ If a pressure smaller than the minimum permitted pressure or greater than the maximum
permitted pressure is present at the device, the following messages are output insuccession (depending on the setting in the "Alarm behavior" (050) parameter): "S140
Working range P" or "F140 Working range P" "S841 Sensor range" or "F841 Sensor range""S971 Adjustment"‣ Only use the device within the sensor range limits!

8.1

Commissioning with an operating menu

8.1.1

Selecting the language, measuring mode and pressure unit

Language (000)Navigation

Main menu → Language

Write permission

Operator/Maintenance/Expert

Description

Select the menu language for the local display.

Selection• English• Another language (as selected when ordering the device)• A third language where applicable (language of the placeof manufacture)

Factory setting

EnglishEndress+Hauser

19Commissioning

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

Press. eng. unit (125)
Write permission

Operator/Maintenance/Expert

Description

Select the pressure unit. If a new pressure unit is selected,
all pressure-specific parameters are converted anddisplayed with the new unit.

Selection• mbar, bar• mmH2O, mH2O
• inH2O, ftH2O• Pa, kPa, MPa• psi• mmHg, inHg
• kgf/cm2

Factory setting

mbar or bar depending on the nominal measuring range ofthe sensor, or as per order specifications.

8.1.2

Position adjustment

Corrected press. (172)
Navigation

Setup → Corrected press.

Write permission

Operator/Maintenance/Expert

Description

Displays the measured pressure after sensor trim andposition adjustment.

Note

If this value is not equal to "0", it can be corrected to "0" by
the position adjustment.

Pos. zero adjust (007) (gauge pressure sensors))
Write permission
20

Operator/Maintenance/Expert
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Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

Commissioning

Description

Pos. zero adjustment – the pressure difference between
zero (set point) and the measured pressure need not beknown.

Example• Measured value = 2.2 mbar (0.033 psi)
• You correct the measured value via the "Pos. zero adjust"parameter with the "Confirm" option. This means that you
are assigning the value 0.0 to the pressure present.
• Measured value (after pos. zero adjustment) = 0.0 mbar
• The current value is also corrected.

Selection• Confirm• CancelFactory setting

CancelCalib. offset (192) / (008) (absolute pressure sensor)
Write permission

Maintenance/Expert

Description

Position adjustment – the pressure difference between theset point and the measured pressure must be known.

Example• Measured value = 982.2 mbar (14.73 psi)
• You correct the measured value with the value entered,e.g. 2.2 mbar (0.033 psi) via the "Calib. offset" parameter.
This means that you are assigning the value to thepressure present 980.0 mbar (14.7 psi).
• Measured value (after pos. zero adjustment) =980.0 mbar (14.7 psi)
• The current value is also corrected.

Factory setting

0.0

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21Commissioning

Cerabar M PMC51, PMP51, PMP55 PROFIBUS PA

8.2

Configuring pressure measurement

8.2.1

Calibration without reference pressure (dry calibration)

Example:In this example, a device with a 400 mbar (6 psi) sensor is configured for the
0 to +300 mbar (0 to 4.5 psi) measuring range, i.e. are assigned 0 mbar and
300 mbar (4.5 psi) respectively.
Prerequisite:
This is a theoretical calibration, i.e. the pressure values for the lower and upper range are
known.
Due to the orientation of the device, there may be pressure shifts in the measured value,i.e. the measured value is not zero in an unpressurized state. For information on how to
perform position adjustment, see →  19.
Description
1 Select the "Pressure" measuring mode via the "Measuring mode" parameter.
Menu path: Setup → Measuring mode

LWARNING
Changing the measuring mode affects the span (URV)This situation can result in product overflow.
‣ If the measuring mode is changed, the setting for the span (URV) must be checked in the "Setup" operating
menu and readjusted if necessary.
2 Select a pressure unit via the "Press. eng. unit" parameter, here "mbar" for example.
Menu path: Setup → Press. eng. unit
3 If necessary, scale the "OUT Value" of the Analog Input Block, , parameter descriptions for "Measured value scaling"and "Output scaling".
4 Result:
The measuring range is configured for 0 to +300 mbar (0 to 4.5 psi).

22

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