FISCHER MA15F A Series User manual

Operation manual
MA15F ... A/B/C/D
Diaphragm manometer
for explosive areas
Gas explosion protection zone 1 and 2, gases and vapours
Dust explosion protection zone 21 and 22, dry dusts
09015053 • BA_EN_MA15_ATEX • Rev. ST4-G • 03/23 *09015053*

| Masthead FISCHER Mess- und Regeltechnik GmbH
2/48 BA_EN_MA15_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 2016
Version history
Rev. ST4-A 11/16 Version 1 (first edition)
Rev. ST4-B 08/17 Version 2 (Correction)
Rev. ST4-C 08/17 Version 3 (Correction)
Rev. ST4-D 03/18 Version 4 (update)
Rev. ST4-E 09/19 Version 5 (new accessories)
Rev. ST4-F 10/21 Version 6 (UKCA Declaration; Duratherm above 160
mbar)
Rev. ST4-G 03/23 Version 7 (liquid filling)

FISCHER Mess- und Regeltechnik GmbH Table of Content
BA_EN_MA15_ATEX 3/48
Table of Content
1 Safety information........................................................................................................... 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 Product summary ................................................................................................................... 7
2.3 Intended use........................................................................................................................... 8
2.4 Function diagram.................................................................................................................... 9
2.5 Design and mode of operation ............................................................................................... 9
3 Assembly ......................................................................................................................... 10
3.1 Generalities ............................................................................................................................ 10
3.2 Process connection ................................................................................................................ 10
3.3 Electrical connections............................................................................................................. 12
3.4 Use in areas at risk of explosion ............................................................................................ 13
4 Commissioning ............................................................................................................... 17
4.1 General................................................................................................................................... 17
4.2 Zero point correction .............................................................................................................. 17
4.3 Switch point setting ................................................................................................................ 18
4.4 Units with a rotation angle transducer .................................................................................... 18
5 Servicing .......................................................................................................................... 19
5.1 Maintenance........................................................................................................................... 19
5.2 Maintenance........................................................................................................................... 19
5.3 Transport ................................................................................................................................ 19
5.4 Service ................................................................................................................................... 19
5.5 Accessories ............................................................................................................................ 20
5.6 Disposal.................................................................................................................................. 20
6 Technical Data................................................................................................................. 21
6.1 Standard version .................................................................................................................... 21
6.2 Options ................................................................................................................................... 22
6.3 Dimensional drawings ............................................................................................................ 23
7 Order Codes .................................................................................................................... 27
7.1 Accessories ............................................................................................................................ 30
8 Attachments .................................................................................................................... 32
8.1 EU Declarations of conformity................................................................................................ 32
8.2 UKCA Declarations of Conformity .......................................................................................... 40

1 | Safety information FISCHER Mess- und Regeltechnik GmbH
4/48 BA_EN_MA15_ATEX
1 Safety information
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.

1 | Safety information FISCHER Mess- und Regeltechnik GmbH
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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).
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.

FISCHER Mess- und Regeltechnik GmbH Product and functional description | 2
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2 Product and functional description
2.1 Delivery scope
• Diaphragm manometer MA15
• Operating Manual
2.2 Product summary
Manometer casing
Scale
Flange
Connecting shanks
Ground connection
Contact element
Contact element
MA15F ... 0A MA15F ... 1B/2C/2D
Fig.1: Product summary
Manometer casing
The following options are available for the manometer casing:
• Bayonet ring housing NG100 or NG160
• Safety casing NG100 or NG160
with unbreakable rear wall and blow-out opening acc. to DIN EN 837
Process connection
Please see the order code for precise details about the process connection op-
tions (flange and connection pin).
G¼B G⅜B G½B ¼-18 NPT ½-14 NPT
M20 x 1.5
Fig.2: Process connection

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
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2.2.1 Type plate
This type plate serves as an example of the information that is stated. The data
shown is purely fictive, but does correspond to the actual conditions. For more
information, please see the order code at the end of these instructions.
Article no.
Contact function
Measuring range
p stat. max.
Prod. no.
MA15F83HV87L011B
Normally open
0 ... 400 bar
40 bar
2106759.01.257
Order code
Connection diagram Serial number
max. Voltage:
max. Current:
max. Power:
max. Capacity:
max. Inductance:
Umax. = V
Imax. = mA
Pmax. = mW
Cimax. = nF
Li max. = µH
Ta = -20°C bis +60°C
T Medium in the unit max. 85°C
CE File-No.: 80003894448
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
UKCA File-No.: 2812-015
2812 Element Materials Technology
Intrinsically safe circuit
Installed inductive proximity switch SJ 2-N
PTB 99 ATEX 2219 X
II 2G Ex ia IIC T6...T1 Gb
II 1D Ex ia IIIC T135°C Da
installed contact element
Fig.3: Name plate
2.3 Intended use
The units may only be used for the purpose stipulated by the manufacturer.
The units serve to measure over-pressure and under-pressure in industrial ap-
plications in areas at risk of explosion acc. to directive 2014/34/EU.
The optional installed switch elements are low-action contacts, mechanical
magnetic spring contacts, inductive proximity switches in a slotted design or ca-
pacitive rotation angle encoder.(1) If the set limit values are exceeded, the out-
put power circuits are opened or closed.
The corresponding setup regulations are to be considered for each application
case.
(1) Please see the information in the order code.

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2.4 Function diagram
1
2
3
4
Fig.4: Function diagram
1 Motion train 2 Connecting rod
3 Flange 4 Diaphragm
2.5 Design and mode of operation
The measuring element, the concentric corrugated diaphragm, is clamped
between two flanges and the medium is applied on one side.
The diaphragm bulges elastically from its normal position as a result of the ap-
plied pressure. The linear movement is proportional to the applied pressure. A
rod assembly on the side of the diaphragm that faces away from the medium
captures the expansion movement and transfers it to the indicator.
The measurement display is shown on a 270 W° scale.

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
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3 Assembly
3.1 Generalities
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.
WARNING
Mounting pressure transmitters
During assembly, observe the respective national and international guidelines
and safety regulations.
Only mount the unit to systems that are depressurized. Only ever operate the
unit within the permitted measuring range or below the maximum overload.
Fig.5: Shutoff valve.
The device is set ex-works for vertical installation, however any installation posi-
tion is possible.
To guarantee safe working conditions during installation and maintenance, suit-
able stop valves must be fitted in the system (see accessories). By means of
the manometer shutoff, the unit
• Can be depressurized or taken out of operation.
• Be disconnected from the power supply within the applicable system for re-
pairs or inspections.
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)
WARNING
Earth connection via the system earth
During assembly, ensure that the earth connection between the unit and the
system earth is ensured. The connection to the system earth is realised via the
process connection. Therefore, never use an insulated Teflon tape or similar.
Design the process connection acc. to EN 837 and use a suitable flat seal.
3.2.1 Measuring lines that need to be connected
The following points need to be observed when connecting the pressure line:
• To ensure there is no influence on the measured values, severe bends and
coils in the wire should be avoided.
• To prevent deposits, there should be a continuous incline or drop of at least
8%.
• When measuring steam pressure, a water bag-forming loop must be
provided due to the temperature (see accessories).

FISCHER Mess- und Regeltechnik GmbH Assembly | 3
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Round shape U-shape
G½
ca. 180
Ø20
56
155
ca. 200
G½
G½
ca. 275
ca. 130
Ø20
Ø56
G½
AF27
Manometer connection
Connection spigot
according to
DIN EN 837-1
Fig.6: Siphon MZ1###
• The transmitter must be positioned below the measuring point for liquid
measurements. Vent the pressure line before commissioning.
• The transmitter must be positioned above the measuring point for gas
measurements.
3.2.2 Pressure surge absorption
Pulsating pressure on the system side can lead to functional problems. We re-
commend installing a damping element in the pressure connection lines as a
protective measure.
a) Capillary throttle
Manometer connection
SW27 AF27
Connection spigot
according to DIN EN 837-1
305
110
G½ G½
Ø88
Ø4
Fig.7: Capillary throttle MZ400#

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
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b) Settable damping reactor
In operating mode, the damping throttle must be set so that the output signal
follows the pressure changes with a delay.
G½
G½
20
66
19
AF27
Setting screw
Connection spigot
according to DIN EN 837-1
Manometer connection
Fig.8: Damping reactor MZ410#
3.3 Electrical connections
3.3.1 General information
Only units with installed contacts or a rotation angle transducer are connected
to the power supply.
• By authorized and qualified specialized personnel only.
• When connecting the unit, the national and international electro-technical
regulations must be observed.
• The electrical connection is usually realised via a cable socket mounted to
the side.
• Disconnect the system from the mains, before electrically connecting the
device.
• Please see the type plate for the connection assignment.
WARNING
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. (e.g. DIN EN 60079)
Ground connection
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.
3.3.2 Limit switch in accordance with data sheet KE
For more technical information about the contact types and connection options,
please see the data sheet KE. You can request the data sheet on request or via
our webserver www.fischermesstechnik.de.

FISCHER Mess- und Regeltechnik GmbH Assembly | 3
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3.3.3 Rotation angle transducer acc. to data sheet KE09
For more technical information about the rotation angle transducer, please see
the data sheet KE09. You can request the data sheet on request or via our web-
server www.fischermesstechnik.de.
3.4 Use in areas at risk of explosion
3.4.1 Diaphragm manometer without contact element
MA15 … 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.
(a) European market (CE):
The documentation for the mechanical part were filed with the notified body
NB0044 TÜV-Nord-Cert under file number 8000389448.
(b) UK market (UKCA):
The documentation for the mechanical part were filed with the notified body
NB2812 Element Material Technology under file number 2812-015.

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
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3.4.2 Diaphragm manometer with magnetic spring contacts
MA15 … 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.
(a) European market (CE):
The documentation for the mechanical part were filed with the notified body
NB0044 TÜV-Nord-Cert under file number 8000389448.
(b) UK market (UKCA):
The documentation for the mechanical part were filed with the notified body
NB2812 Element Material Technology under file number 2812-015.
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 Diaphragm manometer with inductive contacts
MA15 … 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
www.pepperl-fuchs.com.
(a) European market (CE):
The documentation for the mechanical part were filed with the notified body
NB0044 TÜV-Nord-Cert under file number 8000389448.
(b) UK market (UKCA):
The documentation for the mechanical part were filed with the notified body
NB2812 Element Material Technology under file number 2812-015.
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

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
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3.4.4 Diaphragm manometer with rotation angle transducer
MA15 … 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 www.camillebauer.com.
(a) European market (CE):
The documentation for the mechanical part were filed with the notified body
NB0044 TÜV-Nord-Cert under file number 8000389448.
(b) UK market (UKCA):
The documentation for the mechanical part were filed with the notified body
NB2812 Element Material Technology under file number 2812-015.
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

FISCHER Mess- und Regeltechnik GmbH Commissioning | 4
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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 the pressure connections do not leak before commissioning.
4.2 Zero point correction
The pressure measuring units are set in the factory before delivery so that they
do not usually need to be adjusted at the assembly site.
The zero-point may need to be corrected for some units on site (see order
code).
Units with setting screw
Venting valve Venting valve
Zero-point correction screw
Fig.9: Zero point correction
1. Depressurize the measuring line or only exert the existing static system
pressure.
2. Open the venting valve as shown in the illustration and carefully remove the
entire valve plug from the casing.
3. Adjust the measurement value pointer using zero point correction screw to
the scale zero point.
4. Refit the valve plug into the casing.
5. Close the venting valve.
Unit with micro adjustment indicator
Micro adjustment indicators can only be used in units without a fluid filling.
Fig.10: Micro adjustment indicator
1. Open the casing by releasing the bayonet ring.
2. Set the indicator to zero with a screwdriver.
3. Close the casing.

4 | Commissioning FISCHER Mess- und Regeltechnik GmbH
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4.3 Switch point setting
There is an adjustment lock attached to the front pane of the measuring unit on
units with installed limit signal encoders. Using the detachable adjustment key,
the contacts attached to the target indicators can be set to any point along the
scale.
To facilitate switching precision and the service life of the mechanical measur-
ing system, the switching points should lie between 10% and 90% of the meas-
uring range.
Set-point display
Drive pin
Drive arm
Adjustment key
Adjusting lock
Fig.11: Contact element
1. Place the adjustment key on the axle of the adjusting lock
2. Press axle inwards until the drive arm reaches behind the setting pin of the
target value indicator.
3. Set the target value indicator to the required switch point by turning the key.
4. Relieve the axle, remove the adjustment key
Contact function
Function 1: Close contacts for increasing display in clockwise direction.
Function 2: Open contacts for increasing display in clockwise direction.
Contact assignment:
Up to three contacts are available depending on the unit version.
1. Contact left target indicator
2. Contact middle target indicator
3. Contact right target indicator
4.4 Units with a rotation angle transducer
The capacitive rotation angle transducer records the angle setting of the indic-
ator in a contact-free manner and changes this into an measurement that is pro-
portional to the AC current signal. The device is configured in the factory before
delivery and cannot be reset on site.

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5 Servicing
5.1 Maintenance
To ensure reliable operation and a long service life, we recommend carrying out
the following test on a regular basis:
• Check the reading.
• Checking the switch function in connection with the downstream compon-
ents.
• Checking the pressure lines for leaks.
• Checking the electrical connections (terminal connection of the cable).
The precise test cycles and operating and ambient conditions need to be adjus-
ted. If several components of the unit interact, all operating instructions of the
other units also need to be observed.
WARNING
Dust deposits
The device must be cleaned with a damp cloth a regular intervals to prevent
heat build-up. Cleaning intervals depend on the amount of local dust.
5.2 Maintenance
The instrument is maintenance-free. We recommend the following regular in-
spection to guarantee reliable operation and a long service life:
• Check the function in combination with downstream components.
• Check the leak-tightness of the pressure connection lines.
• Check the electrical connections.
The exact test cycles need to be adapted to the operating and environmental
conditions. In combination with other devices, the operating instructions for the
other devices also need to be observed.
5.3 Transport
The measuring device must be protected against impacts. It should be transpor-
ted in the original packaging or a suitable transport container.
5.4 Service
All defective or faulty devices should be sent directly to our repair department.
Please coordinate all shipments with our sales department.
WARNING
Process media residues
Process media residues in and ondismantled devices can be a hazard to
people, animals and the environment. Take adequate preventive measures. If
required, the devices must be cleaned thoroughly.
Return the device in the original packaging or a suitable transport container.

5 | Servicing FISCHER Mess- und Regeltechnik GmbH
20/48 BA_EN_MA15_ATEX
5.5 Accessories
• Siphons MZ1###
• Capillary throttle coil MZ400#
• Settable damping reactor MZ410#
• Manometer shutoff valves MZ5###, MZ6###
Please see here the data sheet MZ measuring devices accessories. Here you
will find more detailed information about the technical data and the order codes
of the accessory parts MZ.
You can request the data sheet on request or via our webserver www.fischer-
messtechnik.de.
5.6 Disposal
Please help to protect the environment by always disposing of the work pieces
and packaging materials in compliance with the valid national waste and recyc-
ling guidelines or reuse them.