FISCHER DE49 A Series User manual

Operating manual
DE49 ## A
Digital differential pressure transmitter
with external sensor
for explosive areas
Dust explosion protection zone 21 and 22, dry dusts
Gas explosion protection zone 1 and 2, gases and vapors
09005572 • BA_EN_DE49_A • Rev. ST4-E • 07/22 *09005572*

| Masthead FISCHER Mess- und Regeltechnik GmbH
2/36 BA_EN_DE49_A
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 2017
Version history
Rev.A 01/10 First issued
Rev.B 06/11 Type testing 1st supplement
Rev. ST4-A 02/17 Version 1 (new EU guidelines 04/2016, type examination
issue 1)
Rev. ST4-B 07/17 Version 2 (Ground connection)
Version 3 (not published)
Rev. ST4-C 01/18 Version 4 (Correction support point table)
Rev. ST4-D 05/19 Version 5 (type examination issue 2)
Rev. ST4-E 09/19 Version 6 (new accessories)
Rev. ST4-F 07/22 Version 7 (Correction Intended use)

FISCHER Mess- und Regeltechnik GmbH Table of contents
BA_EN_DE49_A 3/36
Table of contents
1 Safety guidelines............................................................................................................. 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 Scope of delivery.................................................................................................................... 7
2.2 Intended use........................................................................................................................... 7
2.3 Equipment versions................................................................................................................ 7
2.4 Function diagram.................................................................................................................... 8
2.5 Design and mode of operation ............................................................................................... 9
3 Assembly ......................................................................................................................... 10
3.1 General................................................................................................................................... 10
3.2 Process connection ................................................................................................................ 10
3.3 Electrical connections............................................................................................................. 11
4 Commissioning ............................................................................................................... 13
4.1 Generalities ............................................................................................................................ 13
4.2 Control elements .................................................................................................................... 13
4.3 Parameters............................................................................................................................. 13
5 Servicing .......................................................................................................................... 21
5.1 Maintenance........................................................................................................................... 21
5.2 Transport ................................................................................................................................ 21
5.3 Service ................................................................................................................................... 21
5.4 Disposal.................................................................................................................................. 21
6 Technical data ................................................................................................................. 22
6.1 General................................................................................................................................... 22
6.2 Input variables ........................................................................................................................ 22
6.3 Output parameters ................................................................................................................. 22
6.4 Measurement accuracy .......................................................................................................... 22
6.5 Display and control elements ................................................................................................. 22
6.6 Auxiliary energy ..................................................................................................................... 23
6.7 Application conditions............................................................................................................. 23
6.8 Construction design................................................................................................................ 23
7 Order Codes .................................................................................................................... 25
7.1 Accessories ............................................................................................................................ 26
8 Attachments .................................................................................................................... 28

1 | Safety guidelines FISCHER Mess- und Regeltechnik GmbH
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1 Safety guidelines
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.
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:

FISCHER Mess- und Regeltechnik GmbH Safety guidelines | 1
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• 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 guidelines 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.

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2 Product and functional description
2.1 Scope of delivery
• Digital differential pressure transmitter with external sensor
• User Manual
2.2 Intended use
The differential pressure transmitter DE49##A###BH00MW allows the meas-
urement of under-pressure, over-pressure and differential pressure in liquid and
gaseous media.
Fields of application include
• Tankers
• Fuelling systems
Explosion hazard area classification
The differential pressure transmitter DE49##A###BH00MW is suitable as an
electrical device for operation in potentially explosive areas.
• The unit must be installed in zone 1 or 2 or in zone 21 or 22 if the pressure
connections are connected to zone 0.
• The power circuit must satisfy the ignition protection category "Intrinsic
safety" category "ia".
Designation as per guideline 2014/34/EU.
II 1/2G Ex ia IIC T4 Ga/Gb
II 2D Ex ia IIIC T80°C Db
-10 °C ≤ Ta ≤ +60°C
2.3 Equipment versions
Options:
Cutting ring screw connection
Screw connection
Process connection
Type plate
Pressure compensation ATEX marking
Wall bracket
Measured value display
M12 plug connection
Sensor
Fig.1: Device model DE49 ## A

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
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2.3.1 Type plate
The presented type plates serve to show an example of the information shown.
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 instruc-
tions.
0044 IBExU09ATEX1164
DE49
II 1/2 G Ex ia IIC T4 Ga/Gb
II 2D Ex ia IIIC T80°C Db
Tamb: -10°C to 60°C
Electrical data: see user manual
Product
Basic measuring range
Pmax.
Output signal
2-wire supply (Ex ia)
Prod. No.
Please note!
Do not separate
while energized
Functional
ground
DE49N6A040BH00MW
0 ... 250 mbar
3 bar
4 ... 20 mA 2-wire
≤ 30 V DC
1705717.01.001
ATEX marking
Order Codes
Technical data
Serial number
Electr. connection Year of construction
Fig.2: Nameplate
2.4 Function diagram
Transfer
fluid
Safe area
Hazardous area
Zone 0/1/2
Zone 21/22
Supply PE
Ex ia
Zone 21/22
Zone 1/2
1,999 µC
A
GB
3V3
+
Separating
membrane
Pressure sensor
Fig.3: Function diagram

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2.5 Design and mode of operation
The multifunctional differential pressure transmitter with 2-conductor technology
allows the measurement of under-pressure, over-pressure and differential pres-
sure in liquid and gaseous media. The basis is a piezoresistive pressure sensor
that is attached to a base with glass openings on the inside of a metal case.
The pressures that are to be compared are fed to the inner and outer side of the
sensor membrane via a pressure transfer liquid. The separating membranes
transfer the medium pressure to the pressure transfer liquid.
Piezo resistors are diffused into the silicone membrane. The force resulting from
the differential pressure changes acts on the membrane and changes the resist-
ance. This is measured and processed by the analysis electronics. The meas-
ured value is shown on the LC display and illustrated as an analogue 4-20 mA
signal in the supply circuit.

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
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3 Assembly
3.1 General
The device is designed for installation onto flat assembly plates or walls.
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.
The enclosure protection type IP 65 is only guaranteed, if a suitable power sup-
ply cable is used (see accessories).
If the device is intended for outdoor use, we recommend permanently protecting
the membrane keypad against UV radiation and using a suitable enclosure or at
least the erection of a sufficiently dimensioned canopy as a protection measure
against constant rain or snow.
WARNING
Falling objects
The operator must ensure that any falling objects cannot collide with the in-
stalled unit. Steps must be taken to prevent
wsparks being generated on impact.
winvalidation of the protection class of the casing.
1. This can be avoided by attaching protective cover,
2. a protective casing or
3. a similar element.
3.2 Process connection
The process connection may only be realised by authorised and qualified spe-
cialists that have undergone additional training or briefings or have a permit to
work on explosion-protected units in potentially explosive systems.
Risks emanating from pressure on the instrument should be prevented by
means of suitable action.
• The device may only be installed in Zone 1 or 2 or Zone 21 or 22.
• The process connection may only be connected with Zone 0.
• 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.
• Check whether the allowed maximum pressures and temperatures are ob-
served.
CAUTION
Do not blow into the pressure connections.
This may damage the sensor.

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+
H (high) L (low)
Fig.4: Process connection
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 must be kept as short as possible and installed without any
tight bends to avoid delays.
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.
The device has several connection options for the process connection. There
must be appropriate hoses and pipes available on the system side.
The process connections are marked with (H) and (L) symbols on the device.
The pressure lines must be mounted according to these symbols.
1. Differential pressure measurement
Higher pressure
lower pressure
2. Pressure measurement
Pressure
open
3. Under-pressure measurement
open
Under-pressure
3.3 Electrical connections
Fig.5: Ground connection
The electrical connection may only be realised by authorised and qualified spe-
cialists 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 of 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.
• A CE-conform mains adapter with a slow 200 mA fuse only may be used in
the power supply circuit.
• To ensure safe operation of the device, the power circuit must satisfy the ig-
nition protection category "Intrinsic safety" category "ia" (see Technical
data).
WARNING
Static electricity
The housing is made of a conductive plastic. To discharge any static charging,
the housing must be grounded
The ground terminal is suitable for connecting fine-wire conductors up to 4 mm2
or single-wire conductors up to 6 mm2.

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
12/36 BA_EN_DE49_A
2-conductor circuit
Input signal
Non-ATEX
supply
+Sig
-Sig
+Ub
-Ub
Output signal
Pressure transmitter
DE49
+
Intrinsically safe
barrier
+
Δp
ATEX zone
ia
Fig.6: 2L Circuitry
Supply and signal power circuit limit values
(Ignition protection type intrinsic safety Ex ia IIC)
Ui≤ 30 V
Ii≤ 100 mA
Pi≤ 750 mW
inner effective capacity Ci2.5 nF
effective inner inductivity Linegligible
NOTICE!In contrast to the EMV-GND, the power connections have an in-
ner capacity of max. 5 nF.
Pin assignment
Fig.7: M12 connector 5-pin
Pin Signal name Cable colour
1Supply (+) / output (+) +Ub+Sig brown
2unused n.c. white
3Supply (-) / output (-) -Ub-Sig blau
4unused n.c. schwarz
5Functional earth FE green/yellow
ACoding A
Table1: Supply and output signal

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4 Commissioning
4.1 Generalities
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)
A prerequisite for commissioning is correct installation of all electrical supply
lines and the pressure lines. All connections are arranged so that there are no
mechanical forces acting on the device.
4.2 Control elements
Measured value display Measuring unit
Tastatur Measuring range overstepping
Fig.8: Display and keypad
The LCD display shows the current pressure value in normal mode. The unit is
shown to the right of the measured value.
It is operated via a 3-key film keypad
ÿ
Page down menu Decrease value
û
Call up menu Save value OK
þ
Page up menu Increase value
4.3 Parameters
After being activated, the device briefly displays the software version number
and carries out a display test. Then the transmitter goes into normal mode.
When setting the parameters, the display either shows the respective menu
item or the associated parameter value. The device continues to function whilst
the parameters are being set; the changes come into effect instantly.
Please note that the transmitter will switch to the operating mode again, if no
key is pressed for more than 1 minute.
Proceed as follows to set a parameter:
• Press the enter key
û
to switch to the menu.
ESc
will appear on the dis-
play.
• Use the arrow keys
þ
to select the first parameter.
• If a password has been entered,
-p-
appears in the display. Enter the pass-
word to unlock the menu.
• Use the arrow keys
ÿ
þ
to scroll through the menu.
• Press the enter key
û
to call up the parameter.
• Use the arrow keys
ÿ
þ
to set the required value.
• Press the enter key
û
to save the value.

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After setting all parameters, leave the menu as follows:
• Use the arrow keys
ÿ
þ
to set the
ESc
parameter. You will find these at
the start and also at the end of the menu.
• Press the enter key
û
to leave to the menu.
4.3.1 Zero point control and adjustment
Ensure that the device is not pressurised (if necessary, disconnect any pressure
lines). If the device does precisely indicate zero at this point of time, parameter
0ff
enables you to adjust the measuring value exactly to zero.
After zero-point adjustment, any disconnected pressure sensing lines can be re-
connected.
4.3.2 Damping and zero-point stabilising
If there are unsteady pressure readings at this point of time or during operation,
you can use parameters
dam
and
nP
to stabilise the reading (and the output
signal).
The parameter
dam
functions like a capillary throttle. However, it only acts on
the display and output signal but not on the measuring cell itself. You can set
the response time to pressure jumps with this parameter. The value range is 0.0
s to 200.0 s.
NOTICE
Maximum damping
But with maximum damping, it will take more than 2 minutes for the reading also
to reach zero after a pressure jump from nominal pressure (100 %) to zero!
In many cases, unsteady readings are not a problem during normal operating
mode, but this is not true for the idle state, i.e. if zero (differential) pressure is
expected.
In such situations, parameter
nP
can be used. Its value defines a range of
measurement range around zero. The measured value is set to zero within this
range.
Measured value
Display value
np
Zero-point window
np
2x
-np 2x -np
Fig.9: Zero-point window
Example: A value of 0.08 mbar is entered for
nP
. In this case all pressures within the
range of -0.08 mbar to +0.08 mbar are set to zero on the display. The reading
will only not indicate zero any more if the pressure exceeds these limits. How-
ever the pressure value and display do not correspond to one hundred percent.
The measuring pressure and reading match again when the double value, in
this case 0.16 mbar, is reached again.

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4.3.3 Margin correction
The parameter
span
is used to correct the measuring range span. The current
measurement is shown. Using the arrow keys, this can be changed by up to
±10% of the basic measuring range. Keep the arrow keys pressed until the re-
quired value is shown.
4.3.4 Einheit
The parameter
e In
is used to select one of the following units.
Value Einheit
1 bar
2 mbar
3 PA
4 kPa
5 psi
6 inWc
If the support point table function is used, the measurement is shown without a
unit.
4.3.5 Setting the output signal
Within the basic measuring range (see type plate) the measuring range can be
modified using the parameters
ma
(measuring range start) und
me
(measuring
range end). Both values are adjustable across the entire basic measuring
range. The set values always refer to pressure (in the relevant measuring unit)
and are converted when the measuring unit is changed.
If the pressure signal oversteps the set values, this is shown on the display with
MAX or MIN.
The difference between values
ma
and
me
must at least be 25 % of the basic
measuring range. The software does not allow any larger spreads (Turndown
4:1). If the range information is stated wrongly, you cannot leave the menu.
• If
ma
<
me
, the characteristic curve rises. The output signal grows as the
pressure increases.
• If
ma
>
me
, the characteristic curve drops. The output signal drops as the
pressure increases.
4.3.6 Output signal limits (NAMUR)
Regardless of the pressure, the three parameters
i g1
,
i g2
and
i er
define
the limit values for output signal that may not be undercut or exceeded.
These limit values take precedence over the range defined by the
ma
and
me
.
These parameters primarily serve to prevent error messages in downstream
systems caused by brief overstepping of measuring ranges.
The parameter
i g1
defines the limit value for the minimum output signal. The
output signal may not undercut this value.
The parameter
i g2
defines the limit value for the maximum output signal. The
output signal may not exceed this value.
The parameter
i er
defines the value for the error signal. The value defined via
the parameter
i er
, e.g. 3.8 mA, is issued if the device detects an internal error
and can no longer work correctly. However, not all possible errors and defects
can be detected by the device.

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4.3.7 Function selection
The parameter allows you to select between the following functions:
•
f
=0
The device works as a linear transmitter.
•
f
=1
causes a rooting of the output signal and the display.
•
f
=3 … 30
causes linearization of the output and display based on a support point
table.
NOTICE
Changing the parameter value
Whenever you change the value from
f
the program creates a new table. All
previous values in the table are rejected and replaced with new linear entries.
Rooted output signal
f
=1 causes a rooting of the output signal and the display. The menu shows the
parameters
dpf
,
maf
,
mef
and
med
. The display can be scaled infinitely with
these parameters. The measured value is displayed without a unit and can
therefore be assigned to any unit (free unit).
• The measuring range defined by the parameters
ma
and
me
is converted to
maf
and
mef
.
• The value of
dpf
determines the position of a decimal point.
• The value of
med
determines the underlying medium.
Value Medium
0 Water operation
1 Petrol
2 Diesel
Support point table
f
=3 … 30 causes linearization of the output and display based on a support
point table.
The menu shows the parameters
dpf
,
maf
,
mef
and
med
. These are the same
parameters as for the rooted output signal (see above). Please note that the
support point table for a filling level measurement always needs to be created
with the medium 'water' initially.
Also, a parameter
l In
is shown behind which there is a submenu for entering
value pairs of the support point table. This submenu has its own entry and exit
point that is shown with End. The table is only saved if you return to the main
menu at precisely this point, i.e. if you change to the parameter
l In
in the main
menu again via the key
û
.
If the table is not structured correctly, an error message
err
will appear here
and you cannot quit the submenu.
The table comprises 3...30 pairs of values. The first value pair is
i-01 P-01
( )
.
• The value
i-01
defines the display value of the output signal level.
• The value
P-01
determines the associated pressure.
• Followed by the pairs of values ... (
i-02
|
P-02
) … (
i-30
|
P-30
).
The output is proportional to the display value.

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The table is correct if the following applies for all signal values: The value is lar-
ger than the previous value. Either larger (rising characteristic curve) or smaller
(falling characteristic curve) apply to the pressure values accordingly. No trans-
ition from rising to falling characteristic curves or vice versa is allowed.
MA ME
Input variable
Output / display [%]
100
0
0.0 100.0
Value pair 2
p-02
i-02
Fig.10: Table function
4.3.8 Password
The parameter
pas
serves to define a password.
A value between 0 and 999 can be selected for the password. The value 0 can-
cels the password function.
If a password has been issued, the unit configuration is protected by this pass-
word. You can use the key
û
to switch to the configuration mode, however as
soon as you select a parameter, a password request appears
-p-
. You can set
this with the arrow keys
þ
ÿ
and confirm with
û
. This unlocks the unit and it
can be configured again.
NOTICE
Forgotten password
If the password is forgotten, it can only be deleted again by the manufacturer.

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4.3.9 Reset
The function
rst
allows all settings to be reset to default values. The default
value for this parameter is 0.
Enter the value 1 to carry out a RESET. As soon as the configuration mode is
quitted via the parameter
ESc
, a RESET is carried out and all parameters are
reset to the saved default values.
4.3.10 Parameter menu
After switching on the device, it will briefly indicate the software version number
and before entering the normal operating mode. By using the middle û key on
the membrane keypad you can access the parameter menu. The reading now
shows the text
ESc
. By using the right
þ
key, you can choose the parameters
from the following list one by one.
ESc
menu start (OUTPUT)
ma
Start of measuring range
Enter the pressure value here that corresponds to an output signal of 4mA.
Max. turndown 4:1.
me
End of measuring range
Enter the pressure value here that corresponds to an output signal of 20mA.
Max. turndown 4:1.
dam
Damping measuring pressure
To calm the pressure measurement, enter the minimum rising time (0 … 200s)
here.
ein
Change unit
bar, mbar, Pa, kPa, PSI, InWc
0ff
Offset correction
Correct the measuring pressure to zero here. The display shows the current
measured value that you can change by up to 1/3 of the basic range.
span
Span correction
Correct the pressure measurement span. The display shows the current meas-
ured value that you can change by up to ±10% of the basic range.
np
Zero-point window
Define a range around zero in which the measured value is permanently set to
zero. Outside the range, the measured value is approached as shown in the fig-
ure Zero-point window [}14].

FISCHER Mess- und Regeltechnik GmbH Commissioning | 4
BA_EN_DE49_A 19/36
F
Function selection
• F=0
The device works as a linear transmitter. The parameters marked in red and
blue are hidden.
• F=1
causes a rooting of the output signal and the display.. The parameters
marked in red (dPF, MAF, MEF, MEd) and shown.
• F=3 … 30
causes linearization of the output and display based on a support point
table. The parameter F states the number of support points (value pairs) in
the table. The table can contain 3 to 30 support points. If the table is used,
the parameters marked in red and blue (dPF, MAF, MEF, MED and LIN) are
shown. The measured value is displayed without a unit and can therefore
be assigned to any unit by the user using the additional parameters (free
unit).
The measured value is displayed without a unit and can therefore be assigned
to any unit by the user using the following parameters (free unit).
dPF
Decimal point „free unit“
This parameter states the number of decimal points of the displayed measured
value. Possible values are 0…3.
maf
Start of measuring range "free unit"
Defines the start of the free measuring range. (This value can normally stay at 0
for a filling level measurement)
mef
End of measuring range 'free unit'
Defines the end of the free measuring. Maximum value: 9999.
Med
Fluid
This parameter is specially designed for measuring contents. The medium used
is important when calculating the contents.
0 Water
1 Petrol
2 Diesel
NOTICE!The support point table must always be created for filling levels
with water!
lin
Support point table
Define the support point table here.
end
i-01
p-01
i-02
p-02
i-03
p-03
i-30
p-30
Value pair 1
Value pair 2
Value pair 3
Value pair 30
Sub menu

4 | Commissioning FISCHER Mess- und Regeltechnik GmbH
20/36 BA_EN_DE49_A
i g1
lower current limit
Define the minimum output signal here (3.5... 22.5mA).
i g2
upper current limit
Define the maximum output signal here (3.5... 22.5mA).
i er
Error signal
Define the output signal here (3.5... 22.5mA) that should be issued when there
is an internal error in the device.
pass
Password
A value between 1 and 999 can be selected for the password. The value 0 de-
activates the password function.
rst
Reset
This parameter value is set to 0. If this parameter is set to 1, all parameters are
irrevocably reset to the default settings.
ESc
menu end (OUTPUT)