FISCHER ECO-LINE DE80 User manual

Modbus
Operating manual
DE80
Differential pressure transmitter
ECO-LINE ®
09015257 • BA_EN_DE80 • Rev. ST4-C • 01/22 *09015257*

| Masthead FISCHER Mess- und Regeltechnik GmbH
2/28 BA_EN_DE80
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 2021
Version history
Rev. ST4-A 04/21 Version 1 (first edition)
Rev. ST4-B 06/21 Version 2 (+/- Messbereich als Auslieferungszustand)
Rev. ST4-C 01/22 Version 3 (Modbus version added, UKCA)

FISCHER Mess- und Regeltechnik GmbH Table of contents
BA_EN_DE80 3/28
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 Intended use........................................................................................................................... 6
2.3 Function diagram.................................................................................................................... 6
2.4 Design and mode of operation ............................................................................................... 7
2.5 Device versions ...................................................................................................................... 7
3 Assembly.......................................................................................................................... 9
3.1 General................................................................................................................................... 9
3.2 Process connection ................................................................................................................ 9
3.3 Electrical connection............................................................................................................... 10
4 Start-up ............................................................................................................................. 12
4.1 General................................................................................................................................... 12
4.2 Display.................................................................................................................................... 12
4.3 Config select........................................................................................................................... 12
5 Servicing........................................................................................................................... 18
5.1 Maintenance ........................................................................................................................... 18
5.2 Transport ................................................................................................................................ 18
5.3 Service.................................................................................................................................... 18
5.4 Disposal.................................................................................................................................. 18
6 Technical data.................................................................................................................. 19
6.1 General................................................................................................................................... 19
6.2 Input variables ........................................................................................................................ 19
6.3 Output sizes............................................................................................................................ 19
6.4 Measuring accuracy ............................................................................................................... 20
6.5 Digital interfaces..................................................................................................................... 20
6.6 Auxiliary energy...................................................................................................................... 21
6.7 Operating conditions............................................................................................................... 21
6.8 Display.................................................................................................................................... 21
6.9 Construction design................................................................................................................ 21
7 Order codes...................................................................................................................... 23
7.1 Accessories ............................................................................................................................ 24
8 Attachment ....................................................................................................................... 25

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.

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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
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2 Product and functional description
2.1 Delivery scope
• Differential pressure transmitter DE80 ECO-LINE®
version as stated on the type plate
• Operating Manual
• Closing screw for degree of protection IP65
• Connection set for ventilation ducts
type. No. 04005148 consisting of
2 x hose (6/4 mm) 2.50 m long
2 x measuring nozzle ABS RAL7035 light grey
4 x fastening screw ST2.9 x 9.5-C galvanised and passive.
2.2 Intended use
DE80 is a multi-functional differential pressure transmitter with an optional
changeover contact. It is suitable for measuring overpressure, under-pressure
and differential pressure in neutral gaseous media.
The device may only be used for the purpose stipulated by the manufacturer.
The manufacturer will not be liable for damage arising from incorrect or im-
proper use.
2.3 Function diagram
Sensor
Display
Analogue output
Changeover contact
Differential pressure
Power supply
24 V AC/DC
RS485
Modbus
µC
DIP switch
Parameterization
Zero point button
Offset correction
Potentiometer
Switch point setting
Fig.1: Function diagram

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2.4 Design and mode of operation
The device is based on a piezo-resistive sensor element that is suitable for
measuring overpressure, under-pressure and differential pressure. The pres-
sures to be compared have a direct effect on a silicon membrane equipped with
a measuring bridge.
When the pressure is equal, the measuring membrane is in its idle state. If a
pressure difference occurs, the membrane is deflected and a resistance change
takes place on the attached measuring bridge. This change is evaluated by the
device's electronics and transformed into an analogue output signal. The output
signal can be attenuated and square rooted.
Optionally, the device can be delivered with a full-graphic LC display and a
changeover contact. In addition, the device is available as a 2-wire or Modbus
RTU variant. Overall, the device can be delivered with the following equipment.
3-wire 2-wire Modbus RTU
Analogue output
0/4 … 20 mA or 0/2 … 10 V
x
Current loop 4 … 20 mA x
RS485 Modbus RTU x
Options:
Full graphic LC display x x x
Changeover contact x
2.5 Device versions
Outwardly, the DE80 only differs in the version with measured value display and
without measured value display. Both versions are available as a 2-conductor
and 3-conductor version. All other features can be configured using DIP
switches on devices with analogue output or via the interface on the Modbus
version.
With measuring value display Without measuring value display
Fig.2: Product summary
Connections
Connection on the pressure side is made by means of a hose nipple. The hose
nipple is suitable for both 8/6 mm and 6/4 mm hose.
+
8mm Hose connection
6mm Hose connection
Fig.3: Process connections

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
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Electrical connection is made via an M16 x 1.5 cable screw connection with an
internal terminal strip.
Cable screw connection
M16 x 1.5
Terminal strip
Fig.4: Electric connections
2.5.1 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.
1
2
3
4
5
6
7
8
DE800E0042AL00EW0000
1 mbar / 100 Pa
750 mbar / 75 kPa
0(4)-20 mA, 0(2)-10 V, 3-conductor
24 V AC / DC
2105866.03.001
Type
Pmax
P#
Silicone-free Made in Germany
9
Fig.5: Type plate
1 Conformity (CE, UKCA, etc.) 2 Device type (order code)
3 Basic measuring range 4 Overload capacity
5 Output signal (configurable) 6 Auxiliary voltage
7 Production number 8 Special properties
9 Circuit diagram
Input
Output
Production No.
Proof Pressure
Pmax
P#
Fig.6: Key

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3 Assembly
3.1 General
The device is intended for mounting on level walls and mounting plates. For this
purpose, the device has two mounting holes on the side.
Locking srew
T10
Unlocking
Mounting hole 1
Mounting hole 2
Latch
Fig.7: Protection class IP65
(a) Opening the housing
To open the housing, first remove the screw plug (if present). Then the housing
can then be unlocked. To do this, use a suitable slotted screwdriver to press the
locking lug at the designated point.
(b) Closing the housing
Close the cover until the latch clicks into place. Protection class IP54 is
achieved with the snap-in connection alone.
NOTICE!The screw plug included must be used to achieve IP65.
Please contact the manufacturer if the screw is missing. It is a special screw for
thermoplastics. Protection class IP65 cannot be achieved with another screw as
a replacement.
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)
7.2
7.5
Ø4 mm
Ø6 mm
Fig.8: Plug nipple
The process connection is designed for soft hoses with an inner diameter of 4
or 6 mm. The plug nipple is designed for both hose sizes.
For assembly, proceed as follows:
1. Cut the hose as straight as possible.
2. Push the hose onto the plug nipple as far as it will go.
3. Protect the hose line against mechanical or thermal effects.

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
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3.3 Electrical connection
• By authorized and qualified specialized personnel only.
• When the device is connected, national and international electrotechnical
regulations must be observed.
• Disconnect the system from the mains before electrically connecting the
device.
• Do not connect the device when it is live.
Depending on the version, a different PCB terminal is fitted. All versions except
Modbus have analogue output.
Model Print terminal
2-wire 3-pin
3-conductor without switch output 3-pin
3-conductor with switch output 7-pin
3-conductor with Modbus RTU
(RS485)
5-pin
+
567
Operating voltage and output
2-conductor
+
Δp
p2
p1 +Ub
-Ub
24 V DC
7
6
Output
DE80 Power supply
-Ub
+Ub
+Ub
-Ub
Fig.9: Electrical connection of a 2-conductor
+
567
Operating voltage
3-conductor without switch output
+
Δp
p2
p1 +Ub
-Ub
24 V AC/DC
7
6
Output
+Aout 1 Analogue output
5+Aout 1
(~)
(~)
DE80 Power supply
+Ub
-Ub
+Ub
-Ub
Fig.10: Electrical connection of a 3-conductor without switch output

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+
567
Operating voltage
3-conductor with switch output
+
p2
p1 +Ub
-Ub
24 V AC/DC
Output
+Aout 1 Analogue output
+Aout 1
(~)
(~)
1234
NO
COM
NC
Switch output
Power supply
Δp 7
6
5
DE80
4
3
2
1
NC
COM
NO
+Ub
-Ub
+Ub
-Ub
Fig.11: Electrical connection of a 3-conductor with switch output
+
3-conductor with Modbus
Δp
p2
p1
DE80
5
Operating voltage
1234
+Ub
-Ub
BUS-R
BUS-D0 BUS-D1
Modbus
+Ub
-Ub
24 V AC/DC
5
(~)
(~)
Power supply
4
3
2
1
+Ub
-Ub
BUS-R
BUS-D0
BUS-D1
Fig.12: Electrical connection of a 3-conductor with Modbus
Connection to an existing Modbus RTU network
Slave 1 Slave 2 Slave 247
51234
+Ub
-Ub
BUS-R
BUS-D0 BUS-D1
DE80
Auxiliary power
D0
D1
R
Slave x
MASTER
TAP
Bus termination
M12 connection cable
Fig.13: Modbus RTU network

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 Display
Optionally, the device can be delivered with a LC display. After switching on the
auxiliary voltage, the current measured value appears on the display.
0.375 mbar
Fig.14: Measuring data display
4.3 Config select
When configuring the DE80 devices, a distinction is made between devices with
analogue output and devices with Modbus.
4.3.1 Devices with analogue output
Select measuring range
1
2
3 Measuring range start
4 Output signal current/voltage
5 Output signal offset zero point
6 Square root
7 Damping
8 Unit
1234567
ON
8
ON OFF
LOW HIGH
DIP switch
Switching point adjustment
Zero point button
Switch point setting
Status-LED
DIP switch
LED switch output
Fig.15: Control elements for configuration

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4.3.1.1 Measuring range
1234
ON
5678
31 2
0 ... 1 mbar
0 ... 0,75 mbar
0 ... 0,50 mbar
0 ... 0,25 mbar
0 ... 100 Pa
0 ... 75 Pa
0 ... 50 Pa
0 ... 25 Pa
8 8
3
+/- 1 mbar
+/- 0,75 mbar
+/- 0,50 mbar
+/- 0,25 mbar
+/- 100 Pa
+/- 75 Pa
+/- 50 Pa
+/- 25 Pa
mbar
Pa (kPa)
Basic measuring range 1 mbar / 100 Pa
1 2
31 2
0 ... 10 mbar
0 ... 5 mbar
0 ... 3 mbar
0 ... 1 mbar
0 ... 1000 Pa
0 ... 500 Pa
0 ... 300 Pa
0 ... 100 Pa
3
+/- 10 mbar
+/- 5 mbar
+/- 3 mbar
+/- 1 mbar
+/- 1000 Pa
+/- 500 Pa
+/- 300 Pa
+/- 100 Pa
Basic measuring range 10 mbar / 1000 Pa
1 2
31 2
0 ... 50 mbar
0 ... 30 mbar
0 ... 20 mbar
0 ... 10 mbar
0 ... 5000 Pa
0 ... 3000 Pa
0 ... 2000 Pa
0 ... 1000 Pa
3
+/- 50 mbar
+/- 30 mbar
+/- 20 mbar
+/- 10 mbar
+/- 5000 Pa
+/- 3000 Pa
+/- 2000 Pa
+/- 1000 Pa
Basic measuring range 50 mbar / 5000 Pa
1 2
31 2
0 ... 100 mbar
0 ... 80 mbar
0 ... 60 mbar
0 ... 40 mbar
0 ... 10 kPa
0 ... 8 kPa
0 ... 6 kPa
0 ... 4 kPa
3
+/- 100 mbar
+/- 80 mbar
+/- 60 mbar
+/- 40 mbar
+/- 10 kPa
+/- 8 kPa
+/- 6 kPa
+/- 4 kPa
Basic measuring range 100 mbar / 10 kPa
1 2
31 2
0 ... 250 mbar
0 ... 160 mbar
0 ... 100 mbar
0 ... 80 mbar
0 ... 25 kPa
0 ... 16 kPa
0 ... 10 kPa
0 ... 8 kPa
3
+/- 250 mbar
+/- 160 mbar
+/- 100 mbar
+/- 80 mbar
+/- 25 kPa
+/- 16 kPa
+/- 10 kPa
+/- 8 kPa
Basic measuring range 250 mbar / 25 kPa
1 2

4 | Start-up FISCHER Mess- und Regeltechnik GmbH
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4.3.1.2 Output signal
• Damping affects the analogue output and display.
• DIP switch 2 (symmetry) has no function during root extraction. The meas-
uring range is fixed to 'asymmetrical unidirectional' (0...x).
4561
ON
2 3 87
4 5
Current
Current
Voltage
Voltage
6 6
Linear
Square root
Type / Zero point
Square root
7 7
0,5 s
5 s
Damping
0 ... 20 mA
4 ... 20 mA
0 ... 10 V
2 ... 10 V
Note:
If the analogue output is in U operation, a short circuit at the output is indicated
by the status LED (yellow) flashing continuously. However, an error in power
operation cannot be displayed.
4.3.1.3 Zero point correction
In order to zero the measured value, the zero point button is actuated in the de-
pressurized state. The yellow status LED flashes 1x long and 2x short as con-
firmation.
Zero point correction can compensate for an offset up to 33% of the basic
measuring range.
4.3.1.4 Switch point setting
¼ ¼
To activate the switch point setting, the potentiometer must be quickly adjusted
by ¼ turn.
If the switch point setting mode has been activated, the letters "spc" appear on
the display. Now the switch point can be changed with the potentiometer. The
change has a direct effect on the state of the switching contacts. The analogue
output signal continues to correspond to the pressure measured value. Once
activated, the mode cannot be ended without the switch point being overwritten.
If the potentiometer does not change anything for 10 seconds, the set value is
automatically adopted as the switch point.
The switch point setting is confirmed by the status LED (yellow), which briefly
flashes 1x. The status of the switch contact is indicated by the LED switch out-
put.
The switch output is low-resistance between COM and NC as long as the meas-
ured value is lower than the set switch point. In this state the green LED is off.
If the measured value exceeds the set switch point, the COM-NO path becomes
low-resistance and the LED is switched on.

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4.3.2 Device with Modbus
NOTICE!In this section you will learn how to configure a Modbus device.
Further information can be found in the Modbus manual.
Zero point button
DIP switch
Status LED
Baud rate
Parity
Stop bit
Byte order
Modbus address = OFF
1234567
ON
8
ON OFF
DIP switch
1
2
Interface = ON
Address
1234567
ON
8
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Fig.16: Control elements for configuration
4.3.2.1 Modbus address
NOTICE!Address 0 is reserved for the broadcast. For this reason, a
decimal 1 is added to each set address.
1234567
ON
8
S1 S2 S3 S4 S5 S6 S7 Address
ON=1 OFF=0
20212223242526 Binary
0000000 1
1000000 2
0100000 3
1111111 128
Decimal 1 2 4 8 16 32 64 Sum +1+ + + + + + 127
Σ
=
0
1
2
127
S8
0
0
0
0
Fig.17: Setting the Modbus address

4 | Start-up FISCHER Mess- und Regeltechnik GmbH
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4.3.2.2 Interface
123
ON
ON=1 OFF=0
4567
S1 S2 S3
202122 Binary
000
100
010
Decimal 1 2 4+ +
Baud rate
7
Σ
=
0
1
2
110 3
001
101
4
5
011 6
111 7
2400
4800
9600
14400
19200
38400
57600
115200
123
ON
456 7
S4 S5
0 0
1 0
0 1
Parity
without
even
uneven
123
ON
65 7
S6
0
1
Stop bit
1 Bit
2 Bits
S8
1
1
1
1
1
1
1
1
S8
1
1
1
S8
1
1
S7
0
1
Byte order
MSB ... LSB
LSB ... MSB
S8
1
1
123
ON
8767
4
8
8
8
8
Fig.18: Configuring the interface
4.3.2.3 Description of functions
DIP switches
The Modbus is configured with the DIP switch.
There are two settings areas. They are divided into interface and address con-
figurations. Switch S8 allows you to switch between the two setting areas.
As soon as the BUS configuration is changed using the DIP switches, an in-
formation window appears on the display (if available) with the currently set
BUS configuration.
For complete configuration, the following procedure is recommended:
• First switch on the device and then set all DIP switches to the OFF position.
Now use S1 to S7 to select the desired MODBUS address.
• Next, set switch S8 to ON. Now you can configure the baud rate, parity,
number of stop bits and byte order.
• Moving each switch results in a configuration change. The configuration is
saved after each change. If the operator changes the switch position while
the device is switched off, this does not change the bus parameters.

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Zero point button
In order to zero the measured value (zero point correction), the button is briefly
pressed in the pressureless state. The yellow status LED flashes 1x long and 2x
short as confirmation.
Zero point correction can compensate for an offset of up to 33% of the basic
measuring range.
If the button is pressed for several seconds, an information window with the cur-
rently set BUS configuration appears on the display (if available).
Status LED
The status LED signals confirmation of the zero point correction.
It also flashes quickly and evenly when the device is sending data to the master
via Modbus.

5 | Servicing FISCHER Mess- und Regeltechnik GmbH
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5 Servicing
5.1 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.
5.2 Transport
The measuring device must be protected against impacts. It should be transpor-
ted in the original packaging or a suitable transport container.
5.3 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.
5.4 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.

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6 Technical data
6.1 General
Type designation DE80
Pressure type Differential pressure
Measurement principle Piezo-resistive
Reference conditions (acc. to IEC 61298-1)
Temperature +15 to +25 °C
Relative humidity 45 … 75 %
Air pressure 86 to 106 kPa 860 to 1060 mbar
Installation position vertical
6.2 Input variables
Basic measuring ranges Overload Bursting pressure
1 mbar 100 Pa 0.7 bar 70 kPa 1.0 bar 100 kPa
10 mbar 1000 Pa 0.1 bar 10 kPa 0.2 bar 20 kPa
50 mbar 5000 Pa 0.8 bar 80 kPa 1 bar 100 kPa
100 mbar 10 kPa 0.8 bar 80 kPa 1 bar 100 kPa
250 mbar 25 kPa 1.4 bar 140 kPa 2.5 bar 250 kPa
Each basic measuring range can be divided into three specified measuring
ranges. In the case of devices with a Modbus interface, this is parameterized
via the interface. For devices with an analogue interface, the desired measuring
range can be set using the DIP switches. All options are listed in the measure-
ment accuracy table.
6.3 Output sizes
Analogue output 3-conductor
The output signal can be switched between 0 ... 20 mA, 4 … 20 mA, 0 … 10V
and 2 … 10 V (Live Zero).
Output signal 0 to 20 mA
4 to 20 mA
0 … 10 V
2 … 10 V
Signal range 0.0 to 21.5 mA 0.0 to 10.75 V
Load impedance RL≤ 600 Ω ≥ 2 kΩ
Switch output (changeover contact) 3-conductor
Type Potential-free semiconductor switch (MOS-
FET)
Progr. switching function Changeover contact
Switching voltage 3 to 32 V AC/DC
Max. switching current 0.25 A
Max. switching output 8 W / 8 VA
RON ≤ 4 Ω
Analogue output 2-conductor
Output signal 4 to 20 mA
Signal range 3.5 to 21.5 mA
Admissible resistance RLRL ≤ (Ub – 7 V)/0.02 A

6 | Technical data FISCHER Mess- und Regeltechnik GmbH
20/28 BA_EN_DE80
6.4 Measuring accuracy
• Based on the reference temperature, the information only applies within the
compensation range.
• The measurement error includes linearity, hysteresis and non-repeatability.
• Compensation range: 0 … 60 °C.
• TC spread (for all measuring ranges)
– Type 0.03 %/K
– Max. 0.06 %/K
Measuring range Measurement deviation TC zero point
[mbar] Type Max. Type Max.
Basic measuring range 1 mbar / 100 Pa
±1 0 … 1 0.75 % 1.5 % 0.04 %/K 0.08 %/K
±0.75 0 … 0.75 1.25 % 2.5 % 0.08 %/K 0.16 %/K
±0.5 0 … 0.5 1.75 % 3.5 % 0.14 %/K 0.28 %/K
±0.25 0 … 0.25 2.25 % 4.5 % 0.20 %/K 0.40 %/K
Basic measuring range 10 mbar / 1000 Pa
±10 0 … 10 0.75 % 1.5 % 0.02 %/K 0.05 %/K
±5 0 … 5 1.25 % 2.5 % 0.05 %/K 0.10 %/K
±3 0 … 3 1.75 % 3.5 % 0.07 %/K 0.15 %/K
±1 0 … 1 2.25 % 4.5 % 0.10 %/K 0.20 %/K
Basic measuring range 50 mbar / 5000 Pa
±50 0 … 50 0.75 % 1.5 % 0.02 %/K 0.05 %/K
±30 0 … 30 1.25 % 2.5 % 0.05 %/K 0.10 %/K
±20 0 … 20 1.75 % 3.5 % 0.07 %/K 0.15 %/K
±10 0 … 10 2.25 % 4.5 % 0.10 %/K 0.20 %/K
Basic measuring range 100 mbar / 10kPa
±100 0 … 100 0.75 % 1.5 % 0.02 %/K 0.04 %/K
±80 0 … 80 1.25 % 2.5 % 0.03 %/K 0.06 %/K
±60 0 … 60 1.75 % 3.5 % 0.04 %/K 0.08 %/K
±40 0 … 40 2.25 % 4.5 % 0.05 %/K 0.10 %/K
Basic measuring range 250 mbar / 25 kPa
±250 0 … 250 0.75 % 1.5 % 0.02 %/K 0.04 %/K
±160 0 … 160 1.25 % 2.5 % 0.03 %/K 0.06 %/K
±100 0 … 100 1.75 % 3.5 % 0.04 %/K 0.08 %/K
±80 0 … 80 2.25 % 4.5 % 0.05 %/K 0.10 %/K
6.5 Digital interfaces
Modbus RTU interface
interface RS 485
Report Modbus RTU
Modbus specification Application Protocol Specification
V1.1b3 (April 26, 2012)
Address 1 … 128
Baud rate 2400 … 115200 Baud
Parity Even, uneven, parity
Stopbits 1…2