KA01600P/00/EN/02.23-00
71614895
2023-05-01

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Operating Instructions*71614895* Brief
Cerabar PMP23
71614895

Process pressure measurement

These Instructions are Brief Operating Instructions; they 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 other documentation:
Available for all device versions via:
• Internet: www.endress.com/deviceviewer• Smart phone/tablet: Endress+Hauser Operations App

Basic safety instructions
Requirements for the personnel

Measured process variable

Personnel must meet the following requirements to perform their tasks:‣ Trained, qualified specialists must be suitably qualified to perform thisfunction 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 theapplication) prior to starting work
‣ Follow instructions and comply with basic conditions

PMP23: Gauge pressure or absolute pressure

Intended use
The Cerabar is used to measure absolute and gauge pressure in gases, vapors andliquids. The process-wetted materials of the measuring device must have anadequate level of resistance to the media.
The measuring device may be used for the following measurements (processvariables)• in compliance with the limit values specified under "Technical data"• in compliance with the conditions that are listed in additional documentationsuch as the XA and this manual.

Operational safety
Risk of injury!
‣ Operate the device in proper technical condition and fail-safe condition only.
‣ The operator is responsible for the interference-free operation of the device.
Hazardous area
To eliminate the risk of danger to persons or the facility when the device is usedin the approval-related area (e.g. explosion protection, pressure equipment
safety):‣ Check the nameplate to verify if the ordered device can be put to its intended
use in the approval-related area.
‣ Observe the specifications in the separate supplementary documentation,such as the XA or SD, which is an integral part of these Instructions.

Product identification
Manufacturer address
Endress+Hauser SE+Co. KG
Hauptstraße 179689 Maulburg, Germany
Place of manufacture: See nameplate.

Mounting
Mounting requirements• No moisture may enter the housing when installing or operating the device,or when establishing the electrical connection.
• For metal M12 plugs: Do not remove the protective cap (only in IP69 and Ex
ec version ) of the M12 plug connection until shortly before electricalconnection.
• Do not clean or touch process membranes with hard or pointed objects.
• Do not remove the protection on the process membrane until just before
installation.
• Always tighten the cable entry firmly.
• Point the cable and plug downwards where possible to prevent moisture fromentering (e.g. rain or condensation water).
• Protect housing against impact.
• The following note applies to devices with a gauge pressure measuring celland M12- or valve plug:
NOTICE

If a heated device is cooled during the cleaning process (e.g. by cold water),a vacuum develops for a short time, whereby moisture can penetrate themeasuring cell through the pressure compensation element (1).
Device could be destroyed!
‣ Mount the device with the pressure compensation element (1) pointing
diagonally downwards or to the side as much possible.

1111

KA01600P

Influence of the installation position

Pressure measurement in gases

Any orientation is possible. However, the orientation may cause a zero point
shift, i.e., the measured value does not show zero when the vessel is empty or
partially full, refer to Operating Instructions.

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

Pressure measurement in vapors

ABC

For pressure measurement in vapors, use a siphon. The siphon reduces thetemperature to almost ambient temperature. Mount the device with the shutoff
device at the same level as the tapping point.
Observe the max. permitted ambient temperature of the transmitter!

Pressure measurement in liquids
Mount the device with the shutoff device at the same level or below the tapping
point, see Operating Instructions.

Level measurement
Process membrane axis ishorizontal (A)Process membrane
pointing upwards (B)Process membrane
pointing downwards (C)Calibration position, no effect

Up to +4 mbar (+0.058 psi)

Up to –4 mbar (–0.058 psi)

Mounting location• Always install the device below the lowest measuring point.
• Do not install the device at the following positions:• In the filling curtain• In the tank outlet• in the suction area of a pump
• Or at a point in the tank which could be affected by pressure pulses fromthe agitator.

Electrical connection
Connecting the measuring unit
Terminal assignment

4 to 20 mA output
M12 plug

0.5A

LWARNING
Risk of injury from the uncontrolled activation of processes!
‣ Switch off the supply voltage before connecting the device.
‣ Make sure that downstream processes are not started unintentionally.

Valve plug

LWARNING
An incorrect connection compromises electrical safety!
‣ In accordance with IEC/EN 61010, a suitable circuit breaker must be
provided for the device.
‣ When using the measuring device in hazardous areas, installation must also
comply with the applicable national standards and regulations and the Safety
Instructions or Installation or Control Drawings.
‣ All explosion protection data are given in separate Ex documentation, whichis available upon request. The Ex documentation is supplied as standard withall devices approved for use in explosion hazardous areas.
‣ Protective circuits against reverse polarity, HF influences and overvoltage
peaks are integrated.
‣ The device must be operated with a 500 mA fine-wire fuse (slow-blow).
Connect the device in the following order:
1.

Check whether the supply voltage matches the supply voltage indicatedon the nameplate.

2.

Connect the device as indicated in the following diagram.

Switch on the supply voltage.
For devices with a cable connection: do not close reference air hose (see (a) inthe following drawings)! Protect reference air hose against penetration bywater/condensate.

32

3

4
L–

L+L–32L–A0023487(a)A0022823

A0023783

1: brown = L +, 2: blue = L-, 3: yellow/green = ground connection, (a): reference
air hose

Supply voltage
LWARNING
Supply voltage might be connected!
Explosion Hazard!
‣ When using the measuring device in hazardous areas, installation mustcomply with the corresponding national standards and regulations as well as
the Safety Instructions.
‣ All explosion-protection data are provided in separate Ex documentation thatis available for order. The Ex documentation is supplied as standard with alldevices approved for use in explosion hazardous areas.
Electronic version

Supply voltage

4 to 20 mA output

10 to 30 V DC

Current consumption and alarm signal
Electronic version

Current consumption

Alarm signal 1)

4 to 20 mA output≤ 26 mA> 21 mA1)

2

L+

1

1

LWARNING
Supply voltage might be connected!
Risk of explosion!
‣ Make sure that no supply voltage is applied when connecting.
‣ Switch off the supply voltage before connecting the device.

1 0.5A

0.5A
L+

2CableFor MAX alarm (factory setting)Endress+Hauser