FISCHER DS13 User manual

IEC 61508
SIL
Operating manual
DS13
Differential pressure switch
09005217 • BA_EN_DS13 • Rev. ST4-C • 03/23 *09005217*

| Masthead FISCHER Mess- und Regeltechnik GmbH
2/24 BA_EN_DS13
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 2020
Version history
Rev. ST4-A 04/20 Version 1 (first edition)
Rev. ST4-B 11/21 Version 2 (Correction perm. stat. operating pressure;
UKCA)
Rev. ST4-C 03/23 Version 3 (Correction switching hysteresis)

FISCHER Mess- und Regeltechnik GmbH Table of contents
BA_EN_DS13 3/24
Table of contents
1 Safety instructions.......................................................................................................... 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...................................................................................................... 4
1.6 Inadmissible Modes of Operation........................................................................................... 4
1.7 Safe working practices for maintenance and installation work............................................... 5
1.8 Pictogram explanation............................................................................................................ 5
2 Product and functional description............................................................................... 6
2.1 Delivery scope........................................................................................................................ 6
2.2 Equipment versions................................................................................................................ 6
2.3 Intended use........................................................................................................................... 7
2.4 Function diagram.................................................................................................................... 7
2.5 Design and mode of operation ............................................................................................... 7
3 Assembly ......................................................................................................................... 8
3.1 General................................................................................................................................... 8
3.2 Process connection ................................................................................................................ 8
4 Start-up ............................................................................................................................ 10
4.1 General................................................................................................................................... 10
4.2 Control elements .................................................................................................................... 10
4.3 Opening the enclosure ........................................................................................................... 10
4.4 Switch point setting ................................................................................................................ 11
4.5 Function test........................................................................................................................... 11
5 Servicing .......................................................................................................................... 12
5.1 Maintenance........................................................................................................................... 12
5.2 Transport ................................................................................................................................ 12
5.3 Service ................................................................................................................................... 12
5.4 Disposal.................................................................................................................................. 12
6 Technical data ................................................................................................................. 13
6.1 General Information................................................................................................................ 13
6.2 Input variables ........................................................................................................................ 13
6.3 Output parameters ................................................................................................................. 13
6.4 Operating conditions .............................................................................................................. 14
6.5 Construction design................................................................................................................ 14
7 Order Codes .................................................................................................................... 17
8 Attachments .................................................................................................................... 20

1 | Safety instructions FISCHER Mess- und Regeltechnik GmbH
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1 Safety instructions
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.
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.
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.

FISCHER Mess- und Regeltechnik GmbH Safety instructions | 1
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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.
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).
1. 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).
1. 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).
1. Avoid danger by observing the valid safety regulations.
NOTICE
Note / advice
This indicates useful information of advice for efficient and smooth operation.

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
6/24 BA_EN_DS13
2 Product and functional description
2.1 Delivery scope
• Differential pressure switch DS13
• Operating Manual
2.2 Equipment versions
2.2.1 Pressure chamber
Stainless steelAluminium
Fig.1: Material options for the pressure chamber
2.2.2 Electrical connection
Number cable Cable socket/plug connection
Fig.2: Options for the electrical connection
2.2.3 Type plate
This type plate serves as an example of the information that is stated. For more
information, please see the order code at the end of these instructions.
MESS- UND
REGELTECHNIK
GmbH
D-32107 Bad Salzuflen
Unit depress. and de-energised
Switching capacity:
Article no.
Measuring range
P max.
Prod. no.
Made in Germany
P stat. max.
Connection diagram
Conformity
CE, UKCA, etc.
Order code
Serial number
Fig.3: Type plate

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2.3 Intended use
The DS13 is a switching device for differential pressure, over and under-pres-
sure for gaseous and fluid media. This series is ideally suited for various meas-
uring tasks in rough environments.
Typical application cases are the monitoring of tanks, filters and compressors.
Please contact the manufacturer before using this unit with dirty or aggressive
media because the unit needs to be adapted in terms of the parts that come into
contact with the media.
The device can be used as a functional safety components (SIL) as agreed with
the manufacturer (see order code).
The device is to be exclusively used for the applications agreed between the
manufacturer and the user.
2.4 Function diagram
5
6
1
1
2
3
4
+
Fig.4: Function diagram
1Pressure chamber 2Tappet
3Micro-switch 4Switch point setting
5Measuring diaphragm 6Measuring springs
2.5 Design and mode of operation
A sturdy non-sensitive diaphragm measuring unit that is suitable for measuring
differential pressure, and over and under-pressure is used as a measuring sys-
tem. The unit uses the same measuring principle for all three measuring applic-
ations.
In the rest position, the spring forces on both sides of the membrane are bal-
anced out. Due to the pressure or under-pressure to be measured, a single-
sided force is created on the membrane which shifts the membrane system
against the measurement range springs up to compensation of the spring
forces. In case of overload, the membrane supports against the metallic support
surfaces.
A centrally positioned tappet transfers the movement of the membrane system
onto the operating elements of the micro-switches.

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
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3 Assembly
3.1 General
The device is designed for wall mounting.
NOTICE!At the factory, the device is calibrated for vertical installation and
only this installation position is allowed.
To ensure safety during installation and maintenance, we recommend installing
a suitable shut-off valve on the system (see accessories). A shut-off valve offers
the following advantages:
• The device can be depressurized or decommissioned.
• The device can be disconnected from the power supply within the applic-
able system for repairs or inspections.
• A function test of the device can be performed on-site.
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)
The pressure connections are marked with (+) and (-) symbols on the device.
When the differential pressure is measured, the higher pressure is connected to
the (+) side and the lower pressure to the (-) side.
+
Fig.5: Process connection
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.
In the case of fluid measuring media, the pressure lines must be vented be-
cause different fluid columns in the lines will distort the measurements.
If water is used as a measuring medium, the unit must be protected against
frost.
Pulsating pressure on the system side can lead to wear and functional prob-
lems. To safeguard this, we recommend installing absorption elements in the
pressure line.

FISCHER Mess- und Regeltechnik GmbH Assembly | 3
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Fluid media
Settable reactor pins below the closing cap
G¼
Fig.6: Controllable damping reactor MZ40
In the operational status, the reactor pins need to be set so that the measure-
ment display follows the pressure changes with a delay.
Gaseous media
8
Fig.7: Capillary throttle coils MZ401

4 | Start-up FISCHER Mess- und Regeltechnik GmbH
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4 Start-up
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 the pressure connections do not leak before commissioning.
4.2 Control elements
Switch point setting
Switch 1 Switch 2
Fig.8: Control elements
• Depending on the enclosure model, the switch point setting is accessible in
different ways.
• The enclosure must be opened to set the zero-point.
4.3 Opening the enclosure
1
2
1
2
3
4
PH2
Fig.9: Remove the cover hood
1. Remove the attachment screws (1) with a screwdriver. Ensure that the seal-
ing rings (2) do not get lost. The protection class is no longer guaranteed
without these sealing rings.
2. Remove the Makrolon in the hood (3) and the seal (4).
3. It is assembled in reverse order. The seal (4) must lie precisely in the
groove of the hood before the hood is screwed on.