HBM P8WT User manual

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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..............................................

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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

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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

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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.

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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.

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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.

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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.

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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.

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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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6.1 Connection in six-wire configuration
white
black
gray
Excitation voltage (+)
green
red
Shielding/drain wire,
connected to housing
Excitation voltage (-)
Sense lead (-)
Measurement signal (+)
blue
Sense lead (+)
Measurement signal (-)
Fig. 6.1 Pin Assignment
6.2 Connection in four-wire configuration
When transducers in a six-wire configuration are con-
nected to amplifiers in a four-wire configuration, the
sense leads of the transducer must be connected to the
corresponding excitation voltage leads: Marking (+) with
(+) and marking (-) with (-), see Fig. 6.1. This measure
also reduces the cable resistance of the excitation volt-
age leads. However, there will be a voltage loss on the
supply leads due to the cable resistance that is still
present and not compensated for by the six-wire configu-
ration. A large part of this loss can be eliminated by a cal-
ibration, however, the temperature-dependent part
remains.

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12 A1643-3.0 en/de/fr
Important
The TCcvalue given in the specifications for the trans
ducer therefore does not apply for the cable and trans
ducer combination when connection is in a four-wire con
figuration, where the cable percentage must be added.
6.3 Shortening the cable
If the transducer is connected to an amplifier in a six-wire
configuration, the transducer cable can be shortened as
required, without adversely affecting the measurement
accuracy.
6.4 Cable extension
Only use shielded, low-capacitance measurement cables
for extending. Ensure that connection is perfect, with a
low contact resistance.
The cable of a six-wire transducer can be extended with
a cable of the same type.

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A1643-3.0 en/de/fr 13
6.5 EMC protection
Important
The transducers with shielded, round cables are EMC-
tested in accordance with EC directives and identified by
CE certification. However, you must connect the shield of
the connection cable to the shielding electronics housing
in order to achieve EMC protection for the measuring
chain. You must also connect the pressure connection
and therefore the housing of the transducer to ground.
For reliable measurements, signal differences of less
than 1μV must be transmitted without interference from
the transducer to the evaluation electronics. Due to the
numerous application options and the local constraints,
we can only provide you with information for correct con-
nection. The shielding concept suitable for your applica-
tion must be planned locally by an appropriate specialist.
SUse shielded, low-capacitance measurement cables
only (HBM cables fulfill both conditions).
SDo not route the measurement cables parallel to power
lines and control circuits. If this is not possible, protect
the measurement cable with e.g. steel conduit.
SAvoid stray fields from transformers, motors and con-
tact switches.
SConnect the shield of the connection cable extensively
on the shielding electronics housing.
SThe shield of the connection cable must not be used
for discharging potential differences within the system.
You must therefore lay sufficiently dimensioned poten-
tial equalization lines to compensate for possible
potential differences.

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14 A1643-3.0 en/de/fr
7 Specifications
Type P8WT
Accuracy class 1D 0.3
Number of load cell verification inter
vals nLC 300
Nominal (rated) load Emax bar 500
Minimum load cell verification interval vmin % of Emax 0.142
Temperature coefficient of zero signal
per 10K 2TC0% of Cn±0.2
Nominal (rated) sensitivity CnmV/V 2 ±2%
Temperature coefficient of sensitivity
per 10K 2TCS
% of Cn
0.13
Linearity error 2dlin 0.2
Relative reversibility error 2dhy 0.15
Load creep in 30 min. dcr 0.25
Input resistance RLC Ω 370 (+130/‐70)
Output resistance R0330 (+90/‐30)
Reference excitation voltage Uref
V
5
Nominal (rated) range of the excitation
voltage BU0.5 … 12
Insulation resistance Ris GΩu1
Nominal temperature range BT
°C
‐10 … +40
Operating temperature range Btu ‐40 … +80
Storage temperature range Btl ‐50 … +85
Limit load EL
% of Emax
150
Breaking load Ed200
Relative permissible oscillatory stress
(oscillation width as per DIN 50100) Fsrel 60

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A1643-3.0 en/de/fr 15
Weight, approx. Gkg 0.38
Degree of protection per EN 60529
(IEC529) IP67
Material:
Measuring body
Pressure connection
Cable entry
Cable sheath
1.45423
1.43013
Polyethylene
TPE‐U
1As per OIML R60, with PLC = 0.7.
2The values for non-linearity (dlin), relative reversibility error (dhy) and temperature coefficient of
sensitivity (TCS) are recommended values. The sum of these values is within the cumulated
error limits according to OIML R60.
3Stainless steel as per EN10088-1.

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8 Dimensions
Identification: P8WT/500BAR (Threaded connector: M8 inside)
Identification: P8WT/500BAR (Threaded connector: G1/8 inside)
Order No.:
1−P8WT/500B−001
Order No.:
1−P8WT/500B−002
11.5
8
9.4
G1/8
3
s.p. 14
16−0.1
TPE−U
approx.∅5
approx. 103
approx. 62
approx. 25
9.4
M8
Hexagonal a.f. 14
8
∅16
∅19.5
approx. 100
Dimensions in mm (1 mm = 0.03937 inches)

Deutsch Français
Membran-Druckaufnehmer
P8WT
Bedienungsanleitung
A1643-3.0 en/de/fr

P8WT
2 A1643-3.0 en/de/fr
Deutsch
1 Sicherheitshinweise 3......................................
2.1 Auf dem Aufnehmer angebrachte Symbole 7....................
2.2 In dieser Anleitung verwendete Kennzeichnungen 7..............
3 Lieferumfang 8.............................................
4 Funktionsweise 8...........................................
5 Mechanischer Einbau 9.....................................
6 Elektrischer Anschluss 10....................................
6.1 Anschluss in Sechsleiter‐Technik 11.............................
6.2 Anschluss in Vierleiter‐Technik 11...............................
6.3 Kabelkürzung 12..............................................
6.4 Kabelverlängerung 12.........................................
6.5 EMV‐Schutz 13...............................................
7 Technische Daten 15.........................................
8 Abmessungen 17............................................

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1 Sicherheitshinweise
Bestimmungsgemäßer Gebrauch
Der Aufnehmer darf ausschließlich für Druckmessungen
und direkt damit verbundene Steuerungsaufgaben im
Rahmen der durch die technischen Daten der jeweiligen
Nennlast spezifizierten Belastungsgrenzen verwendet
werden. Jeder darüber hinausgehende Gebrauch gilt als
nicht bestimmungsgemäß.
Jede Person, die mit Aufstellung, Inbetriebnahme oder
Betrieb des Gerätes beauftragt ist, muss die Bedienungs-
anleitung und insbesondere die sicherheitstechnischen
Hinweise gelesen und verstanden haben.
Zur Gewährleistung eines sicheren Betriebes darf der
Aufnehmer nur von qualifiziertem Personal und nach den
Angaben in der Bedienungsanleitung betrieben werden.
Bei der Verwendung sind zusätzlich die für den jeweiligen
Anwendungsfall erforderlichen Rechts‐ und Sicherheits
vorschriften zu beachten. Sinngemäß gilt dies auch bei
der Verwendung von Zubehör.
Der Aufnehmer ist nicht zum Einsatz als Sicherheitsbau-
teil bestimmt. Bitte beachten Sie hierzu den Abschnitt
„Zusätzliche Sicherheitsvorkehrungen“. Der einwandfreie
und sichere Betrieb setzt sachgemäßen Transport, fach-
gerechte Lagerung, Aufstellung und Montage sowie sorg-
fältige Bedienung voraus.
Betriebsbedingungen
SDer Aufnehmer darf ohne unsere ausdrückliche Zu-
stimmung weder konstruktiv noch sicherheitstech-
nisch verändert werden. Insbesondere sind jegliche
Reparaturen, Lötarbeiten an den Platinen (Austausch
von Bauteilen) untersagt.

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4 A1643-3.0 en/de/fr
SBeim Einsatz des Aufnehmers sind die Angaben in
den technischen Datenblättern unbedingt zu
beachten. Insbesondere dürfen die jeweils angege-
benen Maximalbelastungen keinesfalls überschritten
werden. Nicht überschritten werden dürfen die in den
technischen Datenblättern angegebenen
- Grenzlasten
- zulässigen dynamischen Belastungen
- Temperaturgrenzen.
SDer Aufnehmer ist wartungsfrei.
SErst die Zusammenschaltung des (passiven) Aufneh-
mers mit einem Messverstärker führt zu einer
funktionsfähigen Messkette. Stellen Sie dabei sicher,
dass die elektromagnetische Verträglichkeit bzw. die
Einbindung in ein geeignetes EMV‐Schirmungskon
zept gewährleistet ist. Dazu müssen Sie:
- Den Kabelschirm am Eingang des Messverstärkers
flächig auflegen.
- Den Messkörper, d.h. das Gehäuse, mit der
Betriebserde verbinden.
Wichtig
Der Schirm des Aufnehmerkabels ist nicht mit dem
Gehäuse (Masse) verbunden.
Qualifiziertes Personal
Qualifizierte Personen sind Personen, die mit Aufstel-
lung, Montage, Inbetriebsetzung und Betrieb des Produk-
tes vertraut sind und über die ihrer Tätigkeit entspre-
chende Qualifikationen verfügen.