BD Sensors DMD 331 User manual

www.bdsensors.com
EN
Operating Manual
Differential pressure transmitter
DMD 331 and DMD 341
Headquarters
BD SENSORS GmbH
BD-Sensors-Str. 1
D - 95199 Thierstein
Germany
Tel.: [phone]
Fax: [phone]
Eastern Europe
BD SENSORS s.r.o.
Hradištská 817
CZ - 687 08 Buchlovice
Czech Republic
Tel.: [phone]
Fax: [phone]
Russia
BD SENSORS RUS
39a, Varshavskoe shosse
RU - Moscow 117105
Russia
Tel.: [phone]
Fax: [phone]
China
BD SENSORS China Co, Ltd.
6
th
Floor, Building B, No. 8
Lane 658 Jinzhong Rd.
200335 Shanghai, CN
China
Tel.: [phone]
Fax: [phone]
further agencies in:
EUROPE
•Belgium
•Denmark
•Finland
•France
•Great Britain
•Greece
•Italy
•Lithuania
•Luxemburg
•Netherlands
•Norway
•Poland
•Portugal
•Romania
•Sweden
•Switzerland
•Slovakia
•Spain
•Turkey
•UK
•Ukraine
AFRICA
•Egypt
•South Africa
ASIA
•India
•Iran
•Israel
•Japan
•Kazakhstan
•Malaysia
•Singapore
•Taiwan
•Thailand
•Vietnam
AUSTRALIA
The addresses of our distribution partners are listed on our
homepage www.bdsensors.com. It is possible to download
data sheets, operating manuals, ordering codes and certifi-
cates, as well.
1. General information
1.1 Information on the operating manual
This operating manual contains important information on
proper usage of the device. Read this operating manual
carefully before installing and starting up the pressure
measuring device.
Adhere to the safety notes and operating instructions which
are given in the operating manual. Additionally applicable
regulations regarding occupational safety, accident preven-
tion as well as national installation standards and engineer-
ing rules must be complied with!
This operating manual is part of the device, must be kept
nearest its location, always accessible to all employees.
This operating manual is copyrighted. The contents of this
operating manual reflect the version available at the time of
printing. It has been issued to our best knowledge. BD
SENSORS is not liable for any incorrect statements and their
effects.
- Technical modifications reserved –
1.2 Symbols used
U
UU
U DANGER! – dangerous situation, which may result in
death or serious injuries
U
UU
U WARNING! – potentially dangerous situation, which
may result in death or serious injuries
U
UU
U CAUTION! – potentially dangerous situation, which may
result in minor injuries
! CAUTION! – potentially dangerous situation, which may
result in physical damage
NOTE – tips and information to ensure a failure-free
operation
1.3 Target group
U
UU
U WARNING! To avoid operator hazards and damages of
the device, the following instructions have to be worked
out by qualified technical personnel.
1.4 Limitation of liability
By non-observance of the operating manual, inappropriate
use, modification or damage, no liability is assumed and
warranty claims will be excluded.
1.5 Intended use
- The differential pressure transmitters DMD 331,
DMD 331_540 and DMD 341 are intended for industrial
applications. For both sided pressure admission, the dif-
ference of the pressure between positive and negative
side is established and converted into a proportional
electrical signal. The DMD 331 is intended e.g. in engi-
neering and plant construction for filter controlling and
flow measurement as well as in hydraulic applications.
The DMD 341 is intended for the application in the filter
controlling and air conditioning technology.
- It is the operator's responsibility to check and verify the
suitability of the device for the intended application. If
any doubts remain, please contact our sales depart-
ment in order to ensure proper usage. BD SENSORS is
not liable for any incorrect selections and their effects!
- Permissible media are gases or liquids, specified in the
data sheet. In addition it has to be ensured, that this
medium is compatible with the media wetted parts.
- The technical data listed in the current data sheet are
engaging and must be complied with. If the data sheet is
not available, please order or download it from our
homepage. (http://www.bdsensors.com)
U
UU
U WARNING! – Danger through improper usage!
1.6 Package contents
Please verify that all listed parts are undamaged included in
the delivery and check for consistency specified in your
order:
- differential pressure transmitter
- mounting instructions
2. Product identification
The device can be identified by its manufacturing label. It
provides the most important data. By the ordering code the
product can be clearly identified.
! The manufacturing label must not be removed from the
device!
3. Mechanical installation
3.1 Mounting and safety instructions
U
UU
U WARNING! Install the device only when depressurized
and currentless!
U
UU
U WARNING! This device may only be installed by
qualified technical personnel who has read and under-
stood the operating manual!
! Handle this high-sensitive electronic precision
measuring device with care, both in packed and
unpacked condition!
! There are no modifications/changes to be made on the
device.
! Do not throw the device!
! To avoid damaging the diaphragm, remove packaging
and protective cap directly before starting assembly.
The delivered protective cap has to be stored!
! Place the protective cap on the pressure port again
immediately after disassembling.
! Do not use any force when installing the device to
prevent damage of the device and the plant!
! Make sure that no mechanical stresses occur at the
pressure port with low pressure ranges during installa-
tion, as this may cause a shifting of the characteristic
curve.
! For the connection of the pressure lines, a sealing has
to be installed by the operator.
! For the pipe assembly, a stress free installation must be
observed.
! Consider for the installation of a DMD 331 that the
pressure ports must not be turned against the housing!
! For installations outdoor and in damp areas following
these instructions:
- To prevent moisture admission in the plug the de-
vice should be installed electrically after mounting,
at once. Otherwise a moisture admission has to be
blocked e.g. by using a suitable protection cap.
(The ingress protection in the data sheet is valid
for the connected device.)
- Choose an assembly position, which allows the
flow-off of splashed water and condensation. Avoid
permanent fluid at sealing surfaces!
- When using a cable socket device, turn the outgo-
ing cable downwards. If the cable has to be turned
upwards, then point it downward so the moisture
can drain.
- Install the device in such a way that it is protected
from direct solar irradiation. Direct solar irradiation
can lead to the permissible operating temperature
being overstepped in the worst case. By this the
operability of the device can be affected or dam-
aged. If the internal pressure increases due to so-
lar irradiation, measurement errors may be caused.
Take note that no assembly stress occurs at the
pressure port, since this may cause a shifting of the
characteristic curve.
Provide a cooling line when using the device in steam
piping.
If installing the device outdoor and there is any danger
of lightning or overpressure we suggest putting a
overpressure protection unit between the supply/switch
cabinet and the device to prevent damage.
3.2 General installation steps
- Carefully remove the pressure measuring device from
the package and dispose of the package properly.
- Connect the reference pressures according to the fol-
lowing installation steps. Therefore, keep in mind that
the higher pressure has to be connected with input "p+";
lower pressure has to be connected with input "p-".
- Fix the device according to your demands on the holder
or holding angle intended for it. For mounting the de-
vice, mounting threads are provided. For DMD 341, in
addition, the possibility is given to mount the device by
using the two holes (∅4.5 mm). The exact position is
defined in the data sheet.
3.3 Installation steps for G 1/2" acc. to EN 837 (DMD 331)
- Use suitable cooper gaskets for each pressure port,
corresponding to the diameter of the threads which
should be screwed in. (seals are not included in the
scope of delivery)
- Ensure that the sealing surfaces are perfectly smooth
and clean.
- Screw your fittings by hand onto the threads.
- To tighten the fittings properly, hold the DMD 331 on the
spanner flat SW 22 of the respective pressure port with
one hand and then tighten it (max. 50 Nm).
3.4 Installation steps for G 1/4" internal thread (DMD 331)
- Check to ensure that the o-rings fit properly into the
grooves. (o-rings are included in the scope of delivery)
- Make sure that the sealing surfaces of the fittings are
perfectly smooth and clean.
- Screw the fittings into the threads by hand.
- To tighten the fittings properly, hold the DMD 331 on the
spanner flat SW 22 of the respective pressure port with
one hand and then tighten it (max. 20 Nm).
3.5 Installation steps for G 7/16" UNF (DMD 331)
- Seal the pressure ports of the differential pressure
transmitter in a way that is suitable for your application.
(seals are not included in the scope of delivery)
- Screw your fittings by hand onto the threads.
- To tighten the fittings properly, hold the DMD 331 on the
spanner flat SW 22 of the respective pressure port with
one hand and then tighten it (max. 30 Nm).
type
designa
tion
serial
number
nominal
range
signal
input "p+" input "p-"
supply
differential
pressure
range
ordering
code
connector
pinout
Fig. 1 manufacturing label
DMD 331

DMD_E_011013
3.7 Installation steps for G 1/8" internal thread (DMD 341)
- Seal the pressure ports of the differential pressure
transmitter in a way that is suitable for your application.
(seals are not included in the scope of delivery)
- Screw the fittings into the threads as far as possible
- Tighten the fittings properly (max. 10 Nm).
3.8 Installation steps for tube nozzle ∅
∅∅
∅6.6x11 (DMD 341)
- Slip your flexible tubes (∅6 mm) onto the tube nozzles
as far as possible.
4. Electrical installation
U
UU
U WARNING! Install the device only when depressurized
and currentless!
Establish the electrical connection of the device according to
the technical data shown on the manufacturing label, the
following table and the respective wiring diagram.
Pin configuration
Wiring diagrams
2-wire-system (current)
3-wire-system (current/supply)
! For a device with ISO 4400 plug and cable socket, you
have to make sure that the external diameter of the
used cable is within the allowed clamping range.
Moreover you have to ensure that it lies in the cable
gland firmly and cleftlessly! To ensure the ingress
protection mentioned in the data sheet, the socket has
to be mounted properly. Please check if the delivered
seal is placed between plug and cable socket. After
connecting the cable fasten the cable socket on the
device by using the screw.
For the electrical connection a shielded and twisted
multicore cable is recommended.
5. Initial start-up
Please note that for starting up, the device has to be
stressed by pressure simultaneously at both pressure ports.
Otherwise the sensor could be damaged. For one-sided
pressure admission, the permissible static pressure (one-
sided) must be attended. Please take this out of the current
data sheet.
U
UU
U WARNING! Before start-up, the user has to check for
proper installation and for any visible defects.
U
UU
U WARNING! The device can be started and operated by
authorized personnel only, who have read and under-
stood the operating manual!
U
UU
U WARNING! The device has to be used within the
technical specifications, only (compare the data in the
data sheet)!
6. Placing out of service
U
UU
U WARNING! When dismantling the device, it must
always be done in the depressurized and currentless
condition! Check also if the medium has to be drained
off before dismantling!
U
UU
U WARNING! Depending on the medium, it may cause
danger for the user. Comply therefore with adequate
precautions for purification.
7. Maintenance
In principle, this device is maintenance-free. If desired, the
housing of the device can be cleaned when switched of
using a damp cloth and non-aggressive cleaning solutions.
Depending on the measuring medium, however, the dia-
phragm may be polluted or coated with deposit. If the
medium is known for such tendencies, the user has to set
appropriate cleaning intervals. If necessary, it is recom-
mended to send the device to BD SENSORS for cleaning.
Please read therefore the chapter “Service/Repair” below.
! An incorrect cleaning can cause irreparable damages
on diaphragm. Never use spiky objects or pressured air
for cleaning the diaphragm.
8. Service / Repair
8.1 Recalibration
During the life-time of a transmitter, the value of offset and
span may shift. As a consequence, a deviating signal value
in reference to the nominal pressure range starting point or
end point may be transmitted. If one of these two phenom-
ena occurs after prolonged use, a recalibration is recom-
mended to ensure furthermore high accuracy.
8.2 Return
Before every return of your device, whether for recalibration,
decalcification, modifications or repair, it has to be cleaned
carefully and packed shatter-proofed. You have to enclose a
notice of return with detailed defect description when
sending the device. If your device came in contact with
harmful substances, a declaration of decontamination is
additionally required. Appropriate forms can be downloaded
from our homepage www.bdsensors.com. Should you
dispatch a device without a declaration of decontamination
and if there are any doubts in our service department
regarding the used medium, repair will not be started until an
acceptable declaration is sent.
If the device came in contact with hazardous
substances, certain precautions have to be
complied with for purification!
9. Error handling
10. Disposal
The device must be disposed according to the
European Directives 2002/96/EG and
2003/108/EG (on waste electrical and electronic
equipment) Waste of electrical and electronic
equipment may not be disposed by domestic
refuse!
U
UU
U WARNING! Depending on the measuring medium,
deposit on the device may cause danger for the user
and the environment. Comply with adequate precau-
tions for purification and dispose of it properly.
11. Warranty conditions
The warranty conditions are subject to the legal warranty
period of 24 months from the date of delivery. In case of
improper use, modifications of or damages to the device, we
do not accept warranty claims. Damaged diaphragms will
also not be accepted. Furthermore, defects due to normal
wear are not subject to warranty services.
12. Declaration of conformity / CE
The delivered device fulfils all legal requirements.
The applied directives, harmonised standards and docu-
ments are listed in the EC declaration of conformity, which is
available online at: http://www.bdsensors.com.
Additionally, the operational safety is confirmed by the CE
sign on the manufacturing label.
Malfunction
Possible cause
Error detection / corrective
no output
signal
wrong connected inspect the connection
line break inspect all line connections necessary to supply the device (including
the connector plugs)
defective ampere meter (signal
input)
inspect the ampere meter (fine-wire fuse) or the analog input of the
PLC
analog output
signal too low
load resistance too high verify the value of the load resistance
supply voltage too low verify the output voltage of the power supply
defective energy supply inspect the power supply and the applied supply voltage at the
device
shift of output
signal
diaphragm is contaminated or
damaged please send the device to BD SENSORS for repair
wrong or no
output signal
electrical connection is damaged check the connections
reverse polarity of the pressure
ranges check if the higher pressure is connected with the input "p+"
If you detect an error, please try to eliminate it by using this table or send the device to our service address for repair.
! Improper action and opening can damage the device. Therefore repairs on the device may only be executed by the
manufacturer!
supply +
signal +
VS
A / V
p
I/U
supply –
supply +
supply –
VS
A
p
I