Operating manual
DE25
Digital differential pressure transmitter
for gaseous media
09005155 • BA_EN_DE25 • Rev. ST4-A • 03/17
*09005155*
| Masthead FISCHER Mess- und Regeltechnik GmbH
Masthead
Manufacturer:
Technical editorial team:
FISCHER Mess- und Regeltechnik GmbH
Bielefelderstr. 37a
D-32107 Bad Salzuflen
Telefon: +49 5222 974 0
Telefax: +49 5222 7170
eMail: info@fischermesstechnik.de
web: www.fischermesstechnik.de
Documentation representative: S. Richter
Technical editor: R.Kleemann
All rights, also those to the translation, reserved. No part of these instructions
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. ST4-A 03/17 Version 1 (first edition)
Rev. ST4-B 04/17 Version 2 (correction)
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FISCHER Mess- und Regeltechnik GmbH Table of Contents
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 ........................................................................................................................4
1.6 Inadmissible Modes of Operation .............................................................................................................5
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 Equipment versions ..................................................................................................................................6
2.4 Function diagram ......................................................................................................................................7
2.5 Design and mode of operation..................................................................................................................7
3 Assembly and Starting Operation.................................................................................................................8
3.1 Generalities...............................................................................................................................................8
3.2 Process connection ..................................................................................................................................8
3.3 Electrical connections ...............................................................................................................................9
3.4 Commissioning .........................................................................................................................................9
4 Maintenance..................................................................................................................................................11
4.1 Maintenance ...........................................................................................................................................11
4.2 Transport ................................................................................................................................................11
4.3 Service....................................................................................................................................................11
4.4 Accessories ............................................................................................................................................11
4.5 Disposal ..................................................................................................................................................11
5 Technical Data .............................................................................................................................................. 12
5.1 Generalities.............................................................................................................................................12
5.2 Input variables ........................................................................................................................................12
5.3 Output sizes............................................................................................................................................12
5.4 Measurement accuracy ..........................................................................................................................13
5.5 Auxiliary energy .....................................................................................................................................13
5.6 Application conditions .............................................................................................................................13
5.7 Construction design ................................................................................................................................14
6 Order Codes..................................................................................................................................................16
7 Annex.............................................................................................................................................................18
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1 | Safety guidelines FISCHER Mess- und Regeltechnik GmbH
1 Safety guidelines
1.1 General
WARNING
This operating manual contains instructions fundamental to the installation, operation and maintenance of the device that must be observed unconditionally. It
must be read by the assembler, operator and the specialized personnel in
charge of the instrument before it is installed and put into operation.
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 responsible personnel.
The following sections, in particular instructions about the assembly, commissioning 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 manufactured 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 personnel 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 theinstrument 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 Technical 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.
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FISCHER Mess- und Regeltechnik GmbH Safety guidelines | 1
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 maintenance, inspection and installation work is carried out by qualified specialized personnel.
1.8 Pictogram explanation
DANGER
Type and source of danger
This indicates a direct dangerous situation that could lead to death or serious
injury (highest danger level).
a) Avoid danger by observing the valid safety regulations.
WARNING
Type and source of danger
This indicates a potentially dangerous situation that could lead to death or serious injury (medium danger level).
a) Avoid danger by observing the valid safety regulations.
CAUTION
Type and source of danger
This indicates a potentially dangerous situation that could lead to slight or serious injury, damage or environmental pollution (low danger level).
a) Avoid danger by observing the valid safety regulations.
NOTICE
Note / advice
This indicates useful information of advice for efficient and smooth operation.
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2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
Fixing lug
M12 plug
Cable screw connection
Nameplate
Process connection
Silicone-free
Item number
Measuring range
Electrical output
Operating voltage
Pmax
Prod. No.
sw
br
bl
DE2559K042CK00MW
0 ... 100 mbar
0 ... 10 V
24 V DC/AC
500 mbar
1710885.01.002
Special properties Order Codes
Circuit diagram
Technical data
Serial number
+Sig
U
b
+
U
b
-
2 Product and functional description
2.1 Delivery scope
• Differential pressure transmitter DE25 ## # 042 # K00 # W
• Operating Instructions
2.2 Intended use
The DE25 is a differential pressure transmitter for measuring over-pressure, under-pressure and differential pressure in neutral, non-aggressive gaseous media.
2.3 Equipment versions
The appearance of the various models differs in terms of the electrical connection type.
Illustration1: Equipment versions
2.3.1 Nameplate
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.
Illustration2: Nameplate
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FISCHER Mess- und Regeltechnik GmbH Product and functional description | 2
+
A
D
µC
D
A
+U
b
-U
b
+Sig
2.4 Function diagram
Illustration3: Function diagram
2.5 Design and mode of operation
The basis of this transmitter is a piezo-resistive sensor element. The pressure
that is to be measured acts directly onto a silicon diaphragm equipped with
piezo-resistive resistors. The active pressure generates changes in resistance
that are evaluated by the device's electronics and transformed into an analogue
signal. The output signal is usually available as a current or voltage signal.
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3 | Assembly and Starting Operation FISCHER Mess- und Regeltechnik GmbH
+
Higher pressure
lower pressure
Pressure
open
open
Under-pressure
3 Assembly and Starting Operation
3.1 Generalities
The device is designed for installation onto flat assembly plates or walls. The
casing has integrated assembly straps for this purpose. Ex-works, the device is
set for vertical installation. The pressure connections must point downwards.
The protection type IP 65 is only guaranteed, if a suitable power supply cable is
used (see accessories [}17]).
If the device is intended for outdoor use, we recommend permanently protecting
the device 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.
3.2 Process connection
• By authorized and qualified specialized personnel only.
• The pipes need to be depressurized when the instrument is being connected.
• Appropriate steps must be taken to protect the device from pressure surges.
• Check that the device is suitable for the medium being measured.
• Maximum pressures must be observed (cf. Tech. data)
The pressure lines must be installed at an inclination so that when fluids are
measured no air pockets are created or when measuring gases, no water pockets 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.
Pulsating pressure on the system side can lead to wear and functional problems. To safeguard this, we recommend installing absorption elements in the
pressure line.
The process connections are marked with (+) and (-) symbols on the device.
The pressure lines must be mounted according to these symbols.
Illustration4: Process connection
1. Differential pressure measurement
2. Pressure measurement
3. Under-pressure measurement
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FISCHER Mess- und Regeltechnik GmbH Assembly and Starting Operation | 3
Input
Output
AC
DC
Power supply
Sensor
Signal
+U
b
-Ub/ -Sig
+Sig
+U
b
-U
b
1 2 3
3.3 Electrical connections
• By authorized and qualified specialized personnel only.
• 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.
• Install the consumer-adapted fuses.
• Do not connect the connector if strained.
3-conductor circuit
3.3.1 Version with M12 plug
Illustration6: M12 connector 4pin
3.3.2 Model with cable screw connection
Illustration7: Connection terminal
Illustration5: 3-conductor circuit
Pin Signal name Cable colour
1 Supply (+) +U
b
brown
2 n.c. white
3 Supply (-) / output signal (-) -Ub /-Sig blue
4 Output signal (+) +Sig black
A Coding
In case of the model with cable screw connection, the casing lid needs to be
opened first.
Pin Signal name
1 Output signal (+) +Sig
2 Supply (-) / output signal (-) -Ub /-Sig
3 Supply (+) +U
b
3.4 Commissioning
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.
CAUTION
Leak test
The pressure lines need to be checked for leaks before commissioning.
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3 | Assembly and Starting Operation FISCHER Mess- und Regeltechnik GmbH
Zero-point button
Sensor element
+Sig
-Sig
+U
b
-U
b
AC
DC
3.4.1 Zero-point adjustment
The differential pressure transmitters of series DE25 are set in the factory before delivery so that adjustment at the assembly site is usually unnecessary.
If the zero-point does need to be adjusted, this can be undertaken using the
zero-point button. A prerequisite for this is a depressurized system. If this is not
possible, the pressure lines must be released.
Proceed as follows:
• Switch off the auxiliary energy.
• Open the casing by releasing the four screws in the lid.
• Connect a current or voltage measuring unit to the output.
• Switch on the auxiliary energy.
• If the measured output signal deviates from the zero-point, keep the zeropoint button pressed until the measuring unit shows the correct zero value
in the output after approx. 5 seconds.
• Switch off the auxiliary energy.
• Remove the measuring device.
• Remount the lid of the casing.
• Switch on the auxiliary energy.
Illustration8: Zero-point adjustment
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FISCHER Mess- und Regeltechnik GmbH Maintenance | 4
4 Maintenance
4.1 Maintenance
The instrument is maintenance-free. We recommend the following regular inspection 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.
4.2 Transport
The measuring device must be protected against impacts. It should be transported in the original packaging or a suitable transport container.
4.3 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 ondismantled 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.
4.4 Accessories
• M12 Connection lines of different lengths
• Connection set for intake and outlet channels
For the order numbers, please see the order code [}17].
4.5 Disposal
WARNING
Incorrect disposal may pose a risk to the environment.
Please help to protect the environment by always disposing of the work pieces
and packaging materials in compliance with the valid national waste and recycling guidelines or reuse them.
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5 | Technical Data FISCHER Mess- und Regeltechnik GmbH
5 Technical Data
5.1 Generalities
Reference conditions (acc. to IEC 61298-1)
Temperature +15 … +25 °C
Relative humidity 45 … 75 %
Air pressure 86 … 106 kPa 860 … 1060 mbar
Installation position User-defined
5.2 Input variables
Measuring variable
Differential pressure, positive and negative over-pressure
Measuring ranges
Measuring range Stat. operating pres-
sure max.
mbar mbar mbar
0 … 2.5 50 150
0 … 4 50 150
0 … 6 50 150
0 … 10 100 300
0 … 16 100 300
0 … 25 250 750
0 … 40 250 750
0 … 60 500 1500
0 … 100 500 1500
-2.5 … +2.5 50 150
-4 … +4 50 150
-6 … +6 50 150
-10 … +10 100 300
-16 … +16 100 300
-25 … +25 250 750
-40 … +40 250 750
-60 … +60 500 1500
Bursting pressure
5.3 Output sizes
Electricity Voltage
Output signal 0 … 20 mA 4 … 20 mA 0 … 10 V
Admissible appar-
ent ohmic resistance
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RL ≤ ((Ub-10V)*50Ω)+300Ω Ub < 15 V → RL ≥ 100 kΩ
Ub ≤ 15 V → RL ≥ 2 kΩ
FISCHER Mess- und Regeltechnik GmbH Technical Data | 5
5.4 Measurement accuracy
Measuring range 2.5 4 6 10 16 25 40 60 100
Characteristic curve deviation
Max. %FS 2.5 (1.0)
Type %FS 1.5 (0.5)
TK span
x)
Max. %FS 1.0 1.0 1.0 0.3 0.3 0.3 0.3 0.3 0.3
Type %FS 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Tk zero-point
x)
Max. %FS / 10K 1.0 1.0 1.0 0.4 0.4 0.4 0.4 0.4 0.4
Type %FS / 10K 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
Measuring range ± 2.5 ± 4 ± 6 ± 10 ± 16 ± 25 ± 40 ± 60
Characteristic curve deviation
Max. %FS 2.5 (1.0)
Type %FS 1.5 (0.5)
TK span
x)
Max. %FS / 10K 1.0 0.5 0.3 0.3 0.3 0.3 0.3 0.3
Type %FS / 10K 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Tk zero-point
x)
Max. %FS / 10K 1.0 0.5 0.4 0.4 0.4 0.4 0.4 0.4
Type %FS / 10K 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
+)
Characteristic curve deviation (non-linearity and hysteresis) at 25°C and rated
voltage.
A smaller deviation can be realised in certain measuring ranges (values in
brackets). Please contact our sales department in this case.
x)
with respect to the measuring range (FS).
+)
+)
5.5 Auxiliary energy
Current output Voltage output
Rated Voltage 24 V AC/DC 24 V AC/DC
Admissible operating voltage 12 … 32 V AC/DC 12 … 32 V AC/DC
Limits ca. 23 mA approx. 13 V
5.6 Application conditions
Increase ambient temperature
Media temperature -10 … +50 °C
Storage temperature -20 … +70 °C
Enclosure protection class IP65 as per EN 60529
EMC EN 61326-1:2013
RoHS EN 50581:2012
-10 … +50 °C
EN 61326-2-3:2013
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5 | Technical Data FISCHER Mess- und Regeltechnik GmbH
5.7 Construction design
5.7.1 Process connection
5.7.2 Electrical connection
M12 plug connection 4-pin, male, Coding A
M12 connection cable
(see accessories)
4 x 0.34 mm
sheath PUR Ø 5.2 mm
Bending radius (fixed) 5 x Ø
Bending radius (mobile) 10 x Ø
Cable screw connection M16 x 1.5
min. terminal range 4.5 mm
max. terminal range 10.0
Connection terminal Single-wire (rigid) 0.2 … 2.5 mm
Fine wire (flexible) 0.2 … 2.5 mm
Fine-wire (flexible)
with ferrules
2
2
2
0.2 … 2.5 mm
2
5.7.3 Materials
Housing Polyamide PA 6.6
M12 plug Polyamide PA 6, brass, gold
Cable screw connection Polyamide PA 6
Materials in contact with media Silicon, polyester glass-fibre rein-
5.7.4 Assembly
Integrated wall mounting straps
forced, polyamide PA 6.6, 1.4310, Tygon®,
aluminium, NBR
14 / 20 BA_EN_DE25
FISCHER Mess- und Regeltechnik GmbH Technical Data | 5
91 48,5
76
+
Mounting lug
M12 Connector
Process connection
Cable gland M16 x 1,5
37
43
4,8
44
4,8
87
99
5.7.5 Dimensional drawings
All dimensions in mm unless otherwise stated
Illustration9: Front view
Illustration10: Rear view
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6 | Order Codes FISCHER Mess- und Regeltechnik GmbH
Process connection
Output signal
Operating voltage
Characteristic curve deviation
Electrical connection
Assembly
Type
Measuring range
Code no.
0D E 2 5 4 2 K 0 0 W
1 2 5 6 7 8 9 10 11 123 4
6 Order Codes
Measuring range
[1.2] Measuring range Static operating pressure
98 0 … 2.5 mbar 50 mbar
52 0 … 4 mbar 50 mbar
53 0 … 6 mbar 50 mbar
54 0 … 10 mbar 100 mbar
55 0 … 16 mbar 100 mbar
56 0 … 25 mbar 250 mbar
57 0 … 40 mbar 250 mbar
58 0 … 60 mbar 500 mbar
59 0 … 100 mbar 500 mbar
A6 -2.5 … +2.5 mbar 50 mbar
A7 -4 … +4 mbar 50 mbar
A8 -6 … +6 mbar 50 mbar
A9 -10 … +10 mbar 100 mbar
B1 -16 … +16 mbar 100 mbar
B2 -25 … +25 mbar 250 mbar
C5 -40 … +40 mbar 250 mbar
B3 -60 … +60 mbar 500 mbar
Characteristic curve deviation (relative pressure)
[3]
K Characteristic curve deviation 2.5%
M Characteristic curve deviation 1.0%
Process connection:
[5.6] (Code no.)
42 Plug nipple for 6/4 mm or 8 /6 mm hose
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FISCHER Mess- und Regeltechnik GmbH Order Codes | 6
Output signal:
[7] (Code no.)
A 0 … 20 mA
P 4 … 20 mA
C 0 … 10 V
Operating voltage:
[8] (Code no.)
K 24 V DC
Electrical connection
[11] (Code no.)
M M12 plug connection
E Cable screw connection
Assembly:
[12] (Code no.)
W Wall-mounting
6.1 Accessories
Order no. Planned measures No. of
Poles
06401993 Connection cable with M12 connector 4-pin 2 m
06401994 Connection cable with M12 connector 4-pin 5 m
06401563 Connection cable with M12 connector 4-pin 7 m
06401572 Connection cable with M12 connector 4-pin 10 m
Connection set
Order no. Planned measures hose Length
04005129 Plastic connection set 2 x 6/4 mm 1 m
04005148 Plastic connection set 2 x 6/4 mm 2.5 m
04005163 Plastic connection set 2 x 6/4 mm 5 m
04005216 Plastic connection set 2 x 6/4 mm 10 m
04005217 Plastic connection set 2 x 8/6 mm 1 m
04005218 Plastic connection set 2 x 8/6 mm 5 m
Length
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7 | Annex FISCHER Mess- und Regeltechnik GmbH
7 Annex
Illustration11: CE_DE_DE25
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FISCHER Mess- und Regeltechnik GmbH Annex | 7
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7 | Annex FISCHER Mess- und Regeltechnik GmbH
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