HBM P8WT Bedienungsanleitung
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Diaphragm pressure sensor
P8WT
Operating Manual
A1643-3.0 en/de/fr
P8WT
2 A1643-3.0 en/de/fr
English
1 Safety instructions 3........................................
2 Markings used 7............................................
2.1 Symbols on the transducer 7..................................
2.2 The marking used in this document 7...........................
3 Scope of delivery 8.........................................
4 Function 8.................................................
5 Mechanical installation 9....................................
6 Electrical connection 10......................................
6.1 Connection in six-wire configuration 11..........................
6.2 Connection in four-wire configuration 11.........................
6.3 Shortening the cable 12.......................................
6.4 Cable extension 12...........................................
6.5 EMC protection 13............................................
7 Specifications 14............................................
8 Dimensions 16..............................................
P8WT
A1643-3.0 en/de/fr 3
1 Safety instructions
Designated use
The transducer is to be used exclusively for pressure
measurement and directly related control tasks within the
load limits detailed in the specifications for the respective
maximum capacities. Use for any purpose other than the
above is deemed to be non-designated use.
Any person instructed to carry out installation, commis-
sioning or operation of the device must have read and
understood the Operating Manual and in particular the
technical safety instructions.
In the interests of safety, the transducer should only be
operated by qualified personnel and as described in the
Operating Manual. It is also essential to comply with the
legal and safety requirements for the application con-
cerned during use. The same applies to the use of
accessories.
The transducer is not intended for use as a safety com-
ponent. Please also follow the instructions in the "Addi-
tional safety precautions" section. Proper and safe opera-
tion requires proper transportation, correct storage, siting
and mounting, and careful operation.
Operating conditions
SThe transducer must not be modified from the design
or safety engineering point of view except with our
express agreement. In particular, any repair or solder-
ing work on motherboards (exchanging components)
is prohibited.
SThe data in the technical data sheets must be com-
plied with when using the transducer. The respective
specified maximum loads in particular must never be
P8WT
4 A1643-3.0 en/de/fr
exceeded. The following are set out in the technical
data sheets and must not be exceeded:
- Limit loads
- Permissible dynamic loads
- Temperature limits
SThe transducer is maintenance-free.
SA functional measurement chain is only created when
the (passive) transducer is connected to an amplifier.
Ensure that electromagnetic compatibility or integra-
tion in a suitable EMC shielding concept is provided.
To do this:
- Connect the cable shield extensively to the input of
the amplifier.
- Connect the measuring body, i.e. the housing, to
the ground.
Important
The transducer cable shield is not connected with the
housing (ground).
Qualified personnel
Qualified persons means persons entrusted with the
installation, fitting, commissioning and operation of the
product who possess the appropriate qualifications for
their function.
This includes people who meet at least one of the three
following requirements:
SKnowledge of the safety concepts of measurement
and automation technology is a requirement and as
P8WT
A1643-3.0 en/de/fr 5
project personnel, you must be familiar with these
concepts.
SAs measurement or automation plant operating per-
sonnel, you have been instructed how to handle the
machinery. They are familiar with the operation of the
equipment and technologies described in this docu-
mentation.
SAs commissioning engineers or service engineers,
they have successfully completed the training to qual-
ify them to repair the automation systems. They are
also authorized to activate, ground and label circuits
and equipment in accordance with safety engineering
standards.
Working safely
SError messages should only be acknowledged once
the cause of the error is removed and no further dan-
ger exists.
SAutomation equipment and devices must be designed
in such a way that adequate protection or locking
against unintentional actuation is provided (e.g.
access checks, password protection, etc.).
SAfter making settings and carrying out activities that
are password-protected, ensure that any controls that
may be connected remain in a safe condition until the
switching performance of the device has been tested.
Additional safety precautions
Additional safety precautions to meet the requirements of
the relevant national and local accident prevention regu-
lations must be taken in plants where malfunctions could
cause major damage, loss of data or even personal
injury.
P8WT
6 A1643-3.0 en/de/fr
The scope of supply and performance of the transducer
covers only a small area of measurement technology.
Before starting up the device in a system, a project plan-
ning and risk analysis must first be implemented, taking
into account all the safety aspects of measurement and
automation technology so that residual dangers are mini-
mized. This particularly concerns personal and machine
protection. In the event of a fault, the relevant precau-
tions must establish safe operating conditions.
General dangers of failing to follow the safety
instructions
The transducer corresponds to the state of the art and is
failsafe. The transducer may give rise to residual dangers
if it is inappropriately installed or operated.
P8WT
A1643-3.0 en/de/fr 7
2 Markings used
2.1 Symbols on the transducer
CE certification
The CE mark enables the manufacturer to guarantee that
the product complies with the requirements of the rele-
vant EC directives (the Declaration of Conformity can be
found on the HBM website (www.hbm.com) under
HBMdoc).
2.2 The marking used in this document
Important instructions for your safety are specifically
identified. It is essential to follow these instructions in
order to prevent accidents and damage to property.
Symbol Significance
Important
This marking draws your attention to important infor-
mation about the product or about handling the prod-
uct.
Tip
This marking indicates application tips or other infor-
mation that is useful to you.
Emphasis
See …
Italics are used to emphasize and highlight text and
identify references to sections, diagrams, or external
documents and files.
P8WT
8A1643-3.0 en/de/fr
3 Scope of delivery
1 Diaphragm pressure transducer P8WT
1 Operating manual
4 Function
The P8WT type series transducers are based on an
absolute pressure transducer for the 0 …500 bar mea
suring range. They are suitable for measuring static and
dynamic liquid and gas pressures. Whatever the mount-
ing position, these small and handy transducers can be
used even where space is tight.
The P8WT pressure transducers are optionally equipped
with M8 internal thread or G1/8 connectors.
All commercial hydraulic screw connections can be com-
bined with the P8WT for installation.
P8WT
A1643-3.0 en/de/fr 9
5 Mechanical installation
Before installing the P8WT, check that the threaded con-
nector and the thread in its mating component are sound
and without burrs. The parts must be easy to screw
together.
The transducer can be screwed in in any position
required. If the transducer is used to measure dynamic
pressure characteristics in liquids, it should be installed
with the pressure connection pointing upward, so that it is
not possible for an air cushion to build up in the measure-
ment tube. This would hinder the measurement of
dynamic signals and cause the transducer to heat up to
unpermitted levels.
Mounting
"Coat the threaded connector of the hydraulic connec-
tion with sealant.
"Before electrical connection, screw the transducer
onto the hydraulic connector and tighten the connec-
tion.
P8WT
10 A1643-3.0 en/de/fr
6 Electrical connection
The following can be connected for measurement signal
conditioning:
SCarrier-frequency amplifier
SDC amplifier
designed for strain gage measurement systems.
The transducers are supplied in the standard version in a
six-wire configuration with open cable ends.
Important
The cable shield is not connected with the transducer
housing.
Tip
Route the connection cable so that any condensed water
or dampness forming on the cable can drip off. It must
not be conducted to the transducer (use small loops).
Also ensure that no moisture can penetrate the open
cable ends.
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