FISCHER DA01 0A Series User manual

DA01 ... 0A
DA01 ... 1B
DA01 ... 1C
DA01 ... 2D
Operating manual
DA01 VUW (ATEX)
Differential pressure measuring device
Pressure levels PN250/PN400
Models for use in
explosive areas
09015043 • BA_EN_DA01_VUW_ATEX • Rev. ST4-B • 06/21 *09015043*

| Masthead FISCHER Mess- und Regeltechnik GmbH
2 / 44 BA_EN_DA01_VUW_ATEX
Masthead
Manufacturer: FISCHER Mess- und Regeltechnik GmbH
Bielefelderstr. 37a
D-32107 Bad Salzuflen
Telephone: [phone]
Telefax: [phone]
eMail: [email protected]
web: www.fischermesstechnik.de
Technical editorial team: Documentation representative: T. Malischewski
Technical editor: R. Kleemann
All rights, also those to the translation, reserved. No part of this document may
be reproduced or processed, duplicated or distributed using electronic systems
or any other form (print, photocopy, microfilm or another process) without the
written consent of the company FISCHER Mess- und Regeltechnik GmbH, Bad
Salzuflen.
Reproduction for internal use is expressly allowed.
Brand names and procedures are used for information purposes only and do
not take the respective patent situation into account. Great care was taken
when compiling the texts and illustrations; Nevertheless, errors cannot be ruled
out. The company FISCHER Mess- und Regeltechnik GmbH will not accept any
legal responsibility or liability for this.
Subject to technical amendments.
© FISCHER Mess- und Regeltechnik 2018
Version history
Rev. ST4-A 11/15 Version 1 (first edition)
Rev. ST4-B 06/21 Version 2 (Correction product number key)

FISCHER Mess- und Regeltechnik GmbH Table of Contents
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Table of Contents
1 Sicherheitshinweise .......................................................................................................................................4
1.1 General.....................................................................................................................................................4
1.2 Personnel Qualification.............................................................................................................................4
1.3 Risks due to Non-Observance of Safety Instructions ...............................................................................4
1.4 Safety Instructions for the Operating Company and the Operator............................................................4
1.5 Unauthorised Modification ........................................................................................................................5
1.6 Inadmissible Modes of Operation .............................................................................................................5
1.7 Safe working practices for maintenance and installation work .................................................................5
1.8 Pictogram explanation ..............................................................................................................................6
2 Product and functional description ..............................................................................................................7
2.1 Delivery scope ..........................................................................................................................................7
2.2 Equipment versions ..................................................................................................................................7
2.3 Function diagram ....................................................................................................................................12
2.4 Design and mode of operation................................................................................................................12
3 Assembly.......................................................................................................................................................13
3.1 General information ................................................................................................................................13
3.2 Process connection ................................................................................................................................13
3.3 Electrical connections .............................................................................................................................14
3.4 Use in areas at risk of explosion.............................................................................................................16
4 Commissioning.............................................................................................................................................20
4.1 General...................................................................................................................................................20
4.2 Venting of the pressure lines ..................................................................................................................20
4.3 Zero point correction...............................................................................................................................20
4.4 Switch point setting.................................................................................................................................21
5 Servicing .......................................................................................................................................................22
5.1 Maintenance ...........................................................................................................................................22
5.2 Maintenance ...........................................................................................................................................22
5.3 Transport ................................................................................................................................................22
5.4 Service....................................................................................................................................................22
5.5 Disposal..................................................................................................................................................22
6 Technical Data ..............................................................................................................................................23
6.1 Allgemeines ............................................................................................................................................23
6.2 Input variables ........................................................................................................................................24
6.3 Operating conditions...............................................................................................................................24
6.4 Construction design ................................................................................................................................25
7 Order Codes..................................................................................................................................................32
7.1 accessories.............................................................................................................................................34
8 EU Declarations of conformity ....................................................................................................................35
9 EAC Declaration ...........................................................................................................................................41

1 | Sicherheitshinweise FISCHER Mess- und Regeltechnik GmbH
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1 Sicherheitshinweise
1.1 General
This operating manual contains basic instructions for the installation, operation
and maintenance of the device that must be followed without fail. It must be
read by the installer, the operator and the responsible specialist personnel be-
fore installing and commissioning the device.
This operating manual is an integral part of the product and therefore needs to
be kept close to the instrument in a place that is accessible at all times to the re-
sponsible personnel.
The following sections, in particular instructions about the assembly, commis-
sioning and maintenance, contain important information, non-observance of
which could pose a threat to humans, animals, the environment and property.
The instrument described in these operating instructions is designed and manu-
factured in line with the state of the art and good engineering practice.
1.2 Personnel Qualification
The instrument may only be installed and commissioned by specialized person-
nel familiar with the installation, commissioning and operation of this product.
Specialized personnel are persons who can assess the work they have been
assigned and recognize potential dangers by virtue of their specialized training,
their skills and experience and their knowledge of the pertinent standards.
For explosion-proof models the specialized personnel must have received spe-
cial training or instruction or be authorized to work with explosion-proof instru-
ments in explosion hazard areas.
1.3 Risks due to Non-Observance of Safety Instructions
Non-observance of these safety instructions, the intended use of the device or
the limit values given in the technical specifications can be hazardous or cause
harm to persons, the environment or the plant itself.
The supplier of the equipment will not be liable for damage claims if this should
happen.
1.4 Safety Instructions for the Operating Company and the Operator
The safety instructions governing correct operation of theinstrument must be
observed. The operating company must make them available to the installation,
maintenance, inspection and operating personnel.
Dangers arising from electrical components, energy discharged by the medium,
escaping medium and incorrect installation of the device must be eliminated.
See the information in the applicable national and international regulations.
Please observe the information about certification and approvals in the Tech-
nical Data section.

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The instrument must be decommissioned and secured against inadvertent re-
operationif a situation arises in which it must be assumed that safe operation is
no longer possible. Reasons for this assumption could be:
• evident damage to the instrument
• failure of the electrical circuits
• longer storage outside the approved temperature range.
• considerable strain due to transport
Repairs may be carried out by the manufacturer only.
A professional single conformity inspection as per DIN EN 61010, section 1,
must be carried out before the instrument can be re-commissioned. This inspec-
tion must be performed at the manufacturer's location. Correct transport and
storage of the instrument are required.
1.5 Unauthorised Modification
Modifications of or other technical alterations to the instrument by the customer
are not permitted. This also applies to replacement parts. Only the manufacturer
is authorised to make any modifications or changes.
1.6 Inadmissible Modes of Operation
The operational safety of this instrument can only be guaranteed if it is used as
intended. The instrument model must be suitable for the medium used in the
system. The limit values given in the technical data may not be exceeded.
The manufacturer is not liable for damage resulting from improper or incorrect
use.
1.7 Safe working practices for maintenance and installation work
The safety instructions given in this operating manual, any nationally applicable
regulations on accident prevention and any of the operating company's internal
work, operating and safety guidelines must be observed.
The operating company is responsible for ensuring that all required mainten-
ance, inspection and installation work is carried out by qualified specialized per-
sonnel.

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1.8 Pictogram explanation
DANGER
Type and source of danger
This indicates a direct dangerous situation that could lead to death or serious
injury (highest danger level).
a) Avoid danger by observing the valid safety regulations.
WARNING
Type and source of danger
This indicates a potentially dangerous situation that could lead to death or ser-
ious injury (medium danger level).
a) Avoid danger by observing the valid safety regulations.
CAUTION
Type and source of danger
This indicates a potentially dangerous situation that could lead to slight or seri-
ous injury, damage or environmental pollution (low danger level).
a) Avoid danger by observing the valid safety regulations.
NOTICE
Note / advice
This indicates useful information of advice for efficient and smooth operation.

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2 Product and functional description
2.1 Delivery scope
• Differential pressure measuring device DA01
• Operating Manual
2.2 Equipment versions
The following illustrations depict typical combinations of the measuring cell,
measured value display and contact elements. However, these can be freely
combined according to the order code. Wherever this is not possible, this is
clearly stated.
For instance, a small measuring cell with an NG160 display and a contact ele-
ment is also available.
Large measuring cell Ø130 Small measuring cell Ø75
NG100
NG160
(mbar ranges) (bar ranges)
Fig.1: Device overview
2.2.1 Process connection
1/4-18 NPT
1/2-14 NPT 1/4-18 NPT 1/2-14 NPT
Inner thread Outer thread Cutting ring-
screw connection
12 mm tube
Flange connection
based on DIN 615018
with internal thread G½
G½ G½ G½ G½
G½
Fig.2: Options for the process connection

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
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2.2.2 Nameplate
Article no.
Contact function
Measuring range
p stat. max.
Prod. no.
Made in Germany
DA01V06R03LW001B
NO contact
0 ... 6 bar
250 bar
2106759.01.257
Order code
Connection diagram
Serial number
Only connect to
certified intrinsically
safe circuits.
max. voltage:
max. current:
max. power:
max. capacity:
max. inductance:
Umax. = Vxx
Imax. = xx mA
Pmax. = xx mW
Cimax. = xx nF
Li max. = xx µH
Ta = -20°C bis +60°C
T Medium in unit max. 85°C
Reference no.: 8000373855
0044 TÜV NORD 2014/34/EU
II 2G Ex h IIC T4 Gb
II 2D Ex h IIIC T95°C Db
Limit values
ATEX marking
Fig.3: Nameplate (example)
2.2.3 Contact devices
Snap-action contacts
Inductive contacts
for ATEX devices
KINAX 3W2 708-226D0
KINAX 3W2 708-226E0
Rotation angle encoder in accordance
with data sheet KE09
Limit switch in accordance with
data sheet KE##
Fig.4: Contact devices
2.2.4 Special functions
Marker needle
Trailing needle
Fluid fillings
Unit without contacts
Paraffin oil, glycerine, silicon oil
Unit with inductive contacts
Paraffin oil
Units with magnetic spring contacts
Silicon oil
Fig.5: Special functions

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2.2.5 Assembly
Wall mounting Pipe mounting
Panel mounting set type 1 Panel mounting set type 2
with panel mounting set with front ring
Fig.6: Assembly
The panel installation fittings can only be used in devices with a small measur-
ing cell (Ø75) and a display in the NG100 bayonet ring casing.
WARNING
Panel mounting set
Due to the heavy weight, the operator needs to install a support construction for
installation of the front panel.

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2.2.6 Equipment features (overview)
In the following, the equipment options of the DA01 are shown depending on
the measuring cell used and the pressure stage.
Legend
available
on request
Small measuring cell Ø75
Measuring range
Measured value display Ø100
Inductive contacts
Rotation angle transducer Trailing needle Marker needle Remote seal
12312
0 ... 0.6 bar
0 ... 1 bar
0 ... 1.6 bar
0 ... 2.5 bar
0 ... 4.0 bar
0 ... 6bar
0 ... 10 bar
0 ... 16 bar
0 ... 25 bar
Snap-action contacts
123
Low-action contacts
Pressure levelPN250/PN400
Fig.7: Small measuring cell Ø75 Measured value display Ø100
Measuring range
Measured value display Ø160
Inductive contacts
Rotation angle transducer Trailing needle Marker needle Remote seal
12312
0 ... 0.6 bar
0 ... 1 bar
0 ... 1.6 bar
0 ... 2.5 bar
0 ... 4.0 bar
0 ... 6bar
0 ... 10 bar
0 ... 16 bar
0 ... 25 bar
Snap-action contacts
123
Low-action contacts
Pressure levelPN250/PN400
Fig.8: Small measuring cell Ø75 Measured value display Ø160

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Large measuring cell Ø130
Measuring range
Inductive contacts
Rotation angle transducer Trailing needle Marker needle Remote seal
12312
0 ... 40 mbar
0 ... 60 mbar
0 ... 100 mbar
0 ... 160 mbar
0 ... 250 mbar
0 ... 400 mbar
Snap-action contacts
123
Low-action contacts
Pressure levelPN250 Measured value display Ø100
Fig.9: Große Messzelle Ø130 Messwertanzeige Ø100
Measuring range
Inductive contacts
Rotation angle transducer Trailing needle Marker needle Remote seal
12312
0 ... 40 mbar
0 ... 60 mbar
0 ... 100 mbar
0 ... 160 mbar
0 ... 250 mbar
0 ... 400 mbar
Snap-action contacts
123
Low-action contacts
Pressure levelPN250 Measured value display Ø160
Fig.10: Large measuring cell Ø130 Measured value display Ø160

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2.3 Function diagram
1
2
3
4
5
6
7
88
7
Fig.11: Function diagram
1 Motion train 2 Transfer lever
3 Measuring shaft 4 Pressure transfer fluid
5 Separating membrane 6 Connecting rod
7 Measuring diaphragm 8 Pressure chamber
2.4 Design and mode of operation
The pressures in the pressure chambers that are to be compared are each ex-
erted onto a measuring membrane that can be rigidly connected using a con-
nection rod. To compensate the static pressure, the space between the separat-
ing and measuring membrane is filled with a pressure transfer fluid.
During pressure equalisation, the two measuring membranes are in an idle pos-
ition. In case of pressure difference, the force acting on the membranes causes
it to be moved towards the side of the lower pressure.
The connecting rod transfers the deflection of the measuring membranes onto
the transfer lever mounted to the measuring shaft. Proportional to the current
differential pressure, the measurement shaft makes a rotational movement that
the indicator translates into a rotation angle between 0 and 270°.
In the case of one-sided pressure by the measuring system above and beyond
the measuring range, the over-pressure guard will be activated which supports
the overlosaded membrane.

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3 Assembly
3.1 General information
The device can be mounted in one of the following ways (see Assembly):
1. Wall mounting
The device is designed for installation onto flat assembly plates. The unit is
equipped with a wall mounting plate for this mounting type.
2. Pipe assembly
The device is equipped with a special pipe assembly set and is suitable for
mounting to a 2" pipe (DN50).
3. Panel mounting
Panel mounting is available in two installation models.
–Panel mounting fittings (Type 1)
This variant is only suitable for models with a small measuring system
(Ø75) and a bayonet ring casing NG100.
–Panel installation with front ring (Type 2)
All models are suitable for this variant. A suitable steel construction
must be used to ensure that the front plate can bear the weight of the
DA03. This is possible e.g. by means of a combination with the wall or
pipe assembly.
At the factory, the device is calibrated for vertical installation, but the installation
position is arbitrary. For any installation positions that are not vertical, the zero-
point signal can be corrected via the installed offset correction.
To ensure safety during installation and maintenance, we recommend installing
a suitable shut-off valve on the system (see accessories).
3.2 Process connection
• By authorized and qualified specialized personnel only.
• The pipes need to be depressurized when the instrument is being connec-
ted.
• Appropriate steps must be taken to protect the device from pressure surges.
• Check that the device is suitable for the medium being measured.
• Maximum pressures must be observed (cf. Tech. data)
All supply lines are arranged so that there are no mechanical forces acting on
the device.
The pressure lines must be kept as short as possible and installed without any
tight bends to avoid delays.
The pressure lines must be installed at an inclination so that when fluids are
measured no air pockets are created or when measuring gases, no water pock-
ets are created. If the required inclination is not reached, water or air filters must
be installed at suitable places.
The pressure lines need to be vented for fluid measuring media. [}20].
If water is used as a measuring medium, the unit must be protected against
frost.
If the pressure sensing lines are already pressurised at the time of commission-
ing, zero-point control and adjustment cannot be performed. In such cases, the
device should be only connected to the mains without the pressure sensing
lines.
+
Fig.12: Process connection
The process connections are marked on the unit with (+) and (-) symbols. The
pressure lines are to be mounted according to this marking.
Differential pressure
Higher pressure
lower pressure

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3.3 Electrical connections
DANGER
Operation in areas at risk of explosion
If operated in explosive areas, the electrical data of the unit and the valid local
regulations and guidelines for the installation and operation of electrical systems
in explosive areas must be observed.
• The electrical connection may only be realised by authorised and qualified
specialists that have undergone additional training or briefings or have a
permit to work on explosion-protected units in potentially explosive systems.
• Risks emanating from electrical current or voltage should be prevented by
means of suitable action.
• When connecting the unit, the national and international electro-technical
regulations must be observed.
• Disconnect the system from the mains, before electrically connecting the
device.
• Do not connect the connector if strained.
• Install the consumer-adapted fuses.
Fig.13: Ground connection
Only devices with contact elements are connected to the electrical supply. To
this end there is a cable socket on the side of the device, or a HAN plug in the
power plant version.
The outer ground connection must always be connected to the protective poten-
tial equalisation or a similar local potential equalisation. The connection is suit-
able for connecting fine-wire conductors up to 4 mm2 or single-wire conductors
up to 6 mm2.
3.3.1 Cable socket / HAN plug
1
2
3
4
5
6
M20 x 1.5
Fig.14: Cable socket
1 Lower part 2 Sealing ring EPDM
3 Middle part 4 Sealing ring EPDM
5 Lid 6 Lid screw

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1
2
5
6
3
4
4
Fig.15: HAN connector
1 Cable screw connection M20 x 1.5 2 Sleeve housing Han 3A
3 Socket insert Han 7D 4 Pin insert Han 7D
5 Safety clip 6 Attachment casing Han 3D
3.3.2 Contact elements
Contact elements are supplied in accordance withdata sheet KE . There you will
find a representation of all variants, their pin assignment and the technical data.
4 1 4 1
Fig.16: Magnetic spring contacts
Magnetic spring contacts
The terminal numbers always correspond to the number of the contact. A max-
imum of 1 contact can be used. The contact can be a normally open or normally
closed contact.
1234
-+-+
1 2
Ub= 5 ... 25 V
I≤ 1 mA ≥ 3 mA I
1234
-+-+
1 2
Ub= 5 ... 25 V
Fig.17: Inductive contacts
Inductive contacts
With inductive contacts, the switching function is influenced not only by the slot
initiator but also by the switching amplifier used. A maximum of two contacts
can be used. The contacts can be designed as normally open or normally
closed contacts in any combination.
There are assigned to the target indicators as follows:
Contact 1: left target indicator
Contact 2:right target indicator.
3.3.3 Rotation angle transducers KINAX 3W2
The rotation angle encoder serves to record angular positions, to prepare and
provide the measured values as electrical output signals 0/4…20mA for the
following device. Rotation angle encoder is supplied in accordance withdata
sheet KE09. This contains further information about the pin assignment and the
technical data.
123
RL
+
-
Eb= 12 ... 30V
123
RL
+
-
~
+
-
~
+
-
2-Wire 3-Wire
Fig.18: Rotation angle transducers connection

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3.4 Use in areas at risk of explosion
3.4.1 Differential pressure transmitter without contact element
DA01 … 0A
II 2G Ex h IIC T4 Gb
II 2D Ex h IIIC T95°C Db
Explosive areas Zone 1 and 2, and 21 and 22, risk from gases and dry dust.
Allowed temperatures:
• The maximum surface temperature 95 °C was determined under the follow-
ing conditions without dust accumulation and safety factor.
• Allowed ambient temperature: -20°C to +60°C.
• Allowed medium temperature in the differential measurement unit < 85°C.
WARNING
Compression heat
With gaseous mediums, the instrument temperature can increase due to com-
pression heat. In such cases, the pressure change speed must be limited or re-
duced to the allow measuring substance temperature.
NOTICE!For a differential pressure change between 10% and 90% of the
measuring range and a pulse frequency < 0.06 Hz, the temperature in-
crease is <10K.
To avoid additional heating, the instruments may not be exposed to direct sun-
light during operation!
The standards EN60079-0, EN 60079-31, EN ISO 80079-36 and EN ISO
80079-37 apply for the non-electrical part of the devices in terms of explosion
protection. The applicable requirements of these standards are satisfied.
The documents for the mechanical part were filed with notified office NB0044
(TÜV-Nord-Cert)under the file number 8000373855.

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3.4.2 Differential pressure transmitter with magnetic spring contacts
DA01 … 1B
II 2G Ex h IIC T4 Gb
Simple electric operating equipment acc. to EN60079-11 sec: 5.7 in explosive
areas Zone 1 and 2.
Contact element: KE ## M ## 0B4H2
Allowed temperatures:
• The maximum surface temperature 95 °C was determined under the follow-
ing conditions without dust accumulation and safety factor.
• Allowed ambient temperature: -20°C to +60°C.
• Allowed medium temperature in the differential measurement unit < 85°C.
WARNING
Compression heat
With gaseous mediums, the instrument temperature can increase due to com-
pression heat. In such cases, the pressure change speed must be limited or re-
duced to the allow measuring substance temperature.
NOTICE!For a differential pressure change between 10% and 90% of the
measuring range and a pulse frequency < 0.06 Hz, the temperature in-
crease is <10K.
To avoid additional heating, the instruments may not be exposed to direct sun-
light during operation!
The standards EN60079-0, EN ISO 80079-36 and EN ISO 80079-37 apply for
the non-electrical part of the devices in terms of explosion protection. The ap-
plicable requirements of these standards are satisfied.
As a simple electrical operating unit, the installed electrical switch contacts fulfil
the requirements of the standard EN60079-14 Par. 3.5.2. The devices are not
labelled with respect to the electrical part.
The documents for the mechanical part were filed with notified office NB0044
(TÜV-Nord-Cert)(under the file number 8000373855.
Intrinsically safe power circuits
For use in areas at risk of explosion, instruments must be connected to certified,
intrinsically safe electricity circuits.
Max. voltage Umax 30 V
Max. current Imax 200 mA
Max. power Pmax 800 mW
Max. inner capacity Ci max 60 pF
Max. inner inductivity Li max 4 µH
Recommend circuit breakers see accessories

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3.4.3 Differential pressure transmitter with inductive contacts
DA01 … 1C
II 2G Ex h IIC T4 Gb
II 2D Ex h IIIC T95°C Db
Explosive areas Zone 1 and 2, and 21 and 22, risk from gases and dry dust.
Contact element: KE ## I ## 0C0H2
Allowed temperatures:
• The maximum surface temperature 95 °C was determined under the follow-
ing conditions without dust accumulation and safety factor.
• Allowed ambient temperature: -20°C to +60°C.
• Allowed medium temperature in the differential measurement unit < 85°C.
WARNING
Compression heat
With gaseous mediums, the instrument temperature can increase due to com-
pression heat. In such cases, the pressure change speed must be limited or re-
duced to the allow measuring substance temperature.
NOTICE!For a differential pressure change between 10% and 90% of the
measuring range and a pulse frequency < 0.06 Hz, the temperature in-
crease is <10K.
To avoid additional heating, the instruments may not be exposed to direct sun-
light during operation!
The standards EN60079-0, EN 60079-31, EN ISO 80079-36 and EN ISO
80079-37 apply for the non-electrical part of the devices in terms of explosion
protection. The applicable requirements of these standards are satisfied.
The installed inductive proximity switches of the type SJ2-N (106575) are EC
type-tested with the certificate PTB 99 ATEX 2219 X. The type of the installed
proximity switch is stated on the type plate. The manufacturer is Pepperl+Fuchs
GmbH. For more information about proximity switches, please visit the website
https://www.pepperl-fuchs.com.
The documents for the mechanical part were filed with notified office NB0044
(TÜV-Nord-Cert)(under the file number 8000373855.
Intrinsically safe power circuits
For use in areas at risk of explosion, instruments must be connected to certified,
intrinsically safe electricity circuits.
Max. voltage Umax 16 V
Max. current Imax 25 mA
Max. power Pmax 64 mW
Max. inner capacity Ci max 30 nF
Max. inner inductivity Li max 100 µH
Recommend circuit breakers see accessories

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3.4.4 Differential pressure transmitter with rotation angle transducer
DA01 … 2D
II 2G Ex h IIC T4 Gb
Explosive areas Zone 1 and 2, risk from gases.
Rotation angle transducer: KE0905#9
Allowed temperatures:
• The maximum surface temperature 95 °C was determined under the follow-
ing conditions without dust accumulation and safety factor.
• Allowed ambient temperature: -20°C to +60°C.
• Allowed medium temperature in the differential measurement unit < 85°C.
WARNING
Compression heat
With gaseous mediums, the instrument temperature can increase due to com-
pression heat. In such cases, the pressure change speed must be limited or re-
duced to the allow measuring substance temperature.
NOTICE!For a differential pressure change between 10% and 90% of the
measuring range and a pulse frequency < 0.06 Hz, the temperature in-
crease is <10K.
To avoid additional heating, the instruments may not be exposed to direct sun-
light during operation!
The standards EN60079-0, EN ISO 80079-36 and EN ISO 80079-37 apply for
the non-electrical part of the devices in terms of explosion protection. The ap-
plicable requirements of these standards are satisfied.
The installed capacitive rotation angle measuring transducer of the type KINAX
3W2 are EC type-tested with the certificate ZELM 10 ATEX 0427 X. The type of
the installed rotation angle transducer is stated on the type plate. The manufac-
turer is Camille Bauer Metrawatt AG. For more information about the rotation
angle transducer, please visit the website http://www.camillebauer.com.
The documents for the mechanical part were filed with notified office NB0044
(TÜV-Nord-Cert)(under the file number 8000373855.
Intrinsically safe power circuits
For use in areas at risk of explosion, instruments must be connected to certified,
intrinsically safe electricity circuits.
Max. voltage Umax 30 V
Max. current Imax 160 mA
Max. power Pmax 1 mW
Max. inner capacity Ci max 10 nF
Max. inner inductivity Li max 0 µH
Recommend circuit breakers see accessories

4 | Commissioning FISCHER Mess- und Regeltechnik GmbH
20 / 44 BA_EN_DA01_VUW_ATEX
4 Commissioning
4.1 General
All electrical supply, operating and measuring lines, and the pressure connec-
tions must have been correctly installed before commissioning. All supply lines
are arranged so that there are no mechanical forces acting on the device.
Check that all pressure connections are free of leaks before commissioning.
In models filled with fluid, the venting valve on the upper side of the bayonet
casing must be opened before commissioning! To do this, turn the venting
screw anticlockwise as far as it will go.
Venting screw
Closing screw0.8 x 4
Fig.19: Venting valve
4.2 Venting of the pressure lines
WARNING
Risk connected to pressure
Never remove the venting screw if the unit is still pressurised! Close the shut-off
valves of the flanged fittings or depressurize the system.
The pressure lines need to be vented for before commissioning on devices that
work with fluid media. Proceed as follows:
• Remove the venting screws of the two pressure chambers.
• Carefully increase the system pressure until the fluid level is 5 mm below
the sealing surface of the threaded borehole.
• Close the device with the venting screws
Venting screws
5
Seal (FKM)
Fig.20: Venting with fluid media
4.3 Zero point correction
The differential pressure measuring units are set in the factory before delivery
so that they do not usually need to be adjusted at the assembly site. If this is
still necessary, proceed as follows:
• Depressurize the measuring chamber (+) und (-) side or only exert the exist-
ing static system pressure.