FISCHER DE50 User manual

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d e v e l o p i n g s o l u t i o n s
*09005137* BA_EN_DE50 Rev.A 11/12
*09005137*
Table of Contents
1Safety guidelines
2Application purpose
3Description of the product and functional description
4Installation and assembly
5Commissioning
6Maintenance
7Transport
8Service
9Accessories
10 Disposal
11 Technical Specification
12 Dimensional drawings
13 Order Codes
14 Declaration of conformity
1 Safety guidelines
1.1 General Information
This operating manual contains instruc-
tions fundamental to the installation,
operation and maintenance of the in-
strument that must be observed uncon-
ditionally. It must be read by the assembler, opera-
tor and the specialized personnel in charge of the
instrument before it is installed and put into opera-
tion.
This operating manual is part of the product and
must be kept close by where it is easily accessible
to the responsible specialized personnel.
The subsequent sections, in particular the instruc-
tions on assembly, commissioning and mainte-
nance, contain important safety instructions, non-
observance of which can endanger persons, ani-
mals, the environment and physical objects.
1.2 Personnel Qualification
The instrument may only be installed and commis-
sioned by specialized personnel familiar with the in-
stallation, 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 train-
ing, 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 in-
tended use of the instrument or the limit values giv-
en in the technical specifications can be hazardous
or cause harm to persons, the environment or the
plant itself.
The manufacturer 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 on correct operation of the
instrument shall be observed. The operating com-
pany 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 instrument must be elim-
inated. For more information, please see the appli-
cable national and international regulations.
In Germany these are the DIN EN, UVV regula-
tions, specific industrial guidelines such as DVGW,
Ex, GL, etc., the VDE- regulations and the regula-
tions of the local energy supply companies.
Operating Manual
DE50
Differential pressure transmitter

2-12 | Page
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. Any modifica-
tions / alterations required shall be carried out by
Fischer Mess- und Regeltechnik GmbH only.
1.6 Inadmissible Modes of Operation
The operational safety of this instrument can only
be guaranteed if it is used as intended. The instru-
ment model must be suitable for the medium used
in the system. The limit values given in the technical
data may not be exceeded.
1.7 Safe working practices for
maintenance and installation work
The safety instructions given in this operating man-
ual, any nationally applicable regulations on acci-
dent 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 instal-
lation work is carried out by qualified specialized
personnel.
1.8 Symbol explanation
WARNING!
… indicates a potentially dangerous
situation, non-observance of which
could endanger persons, animals, the
environment or objects.
INFORMATION!
… highlights important information for
efficient and smooth operation.
TIP!
… indicates recommendations that are
not specifically necessary in certain
situations but which could be useful.
2 Application purpose
Measuring transducer and switching device for
over-pressure, under-pressure and differential
pressure of gaseous media. It may only be used for
the intended use given in the manufacturer's data
sheet. If any soiled or aggressive media is expected
on the system side, the instrument needs to be
modified in terms of those parts that have contact
with the medium. Talk to the manufacturer before
ordering.
3 Description of the product and func-
tional description
3.1 Functional Schematic
3.2 Design and mode of action
The base of the measuring and switching instru-
ment DE 50 is a diaphragm capsule measuring sys-
tem that is suitable for measuring overpressure,
under-pressure and differential pressure. The pres-
sure or differential pressure that is to be measured
triggers the diaphragm capsule, thereby moving the
core of the inductive displacement transducer. This
is converted to an electrical output signal in the
downstream electronics. The transformer electron-
ics are available in several models.
In addition to the various operating voltages, the
output signal can be designed as a current or volt-
age signal.
Flows in gaseous media are often measured ac-
cording to the effective pressure principle. To
achieve a flow-proportional measured value, the ef-
fective pressure signal needs to be rooted. There
are transformer electronics available to supply the
rooted output signals for these applications.
In addition to the analogue output signal, the in-
strument can be equipped with potential-free con-
tact outputs that can be set to each value within the
measuring range.
The pressure / differential pressure values can be
displayed as linear measured values on site via an
installed LC display (optional).
4 Installation and assembly
The instrument can be installed on even walls, as-
sembly plates or switch cabinet assembly rails. The
four attachment boreholes are accessible after the
lid has been removed from the instrument.
At the factory, the device is calibrated for vertical
installation, but the installation position is arbitrary.
For any installation positions that are not vertical,
Diaphragm capsule
Inductive displacement
transducer
Output (linear)
Output (rooted)
Switch contact
LC display
Electronics

P a g e | 3-12
the zero-point signal can be corrected via the in-
stalled zero-point adjuster.
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
instrument should only be connected to
the mains without the pressure sensing lines.
To prevent condensation gathering in the instru-
ment, the pressure connections need to point
downwards. The casing protection class IP 54 is
only guaranteed if the correct connection wires for
the cable screw connections are used. Their outer
diameter must lie between 6.5 mm and 8 mm.
4.1 Process connection
•By authorized and qualified specialized person-
nel only.
•The pipes need to be depressurized when the
instrument is being connected.
•Appropriate steps must be taken to protect the
instrument from pressure surges.
•Check the suitability of the instrument for the
media to be measured.
•Only for designated mechanical process con-
nections. For the model, see the order code on
the instrument's type plate.
•Check that the pressure connections do not
leak before commissioning.
•Maximum pressures shall be observed.
•Do not blow into the pressure connections.
The pressure connections are marked with ○
+and
○
-symbols on the instrument. The pressure con-
nections need to be mounted according to this in-
formation.
Differential pressure measurements
○
+
Higher pressure
○
-
Low pressure
Pressure measurements
○
+
Pressure connection
Under-pressure measurement
○
-
Under-pressure connection
4.2 Electronic connection
•By authorized and qualified specialized person-
nel only.
•The electrical connection of the instrument shall
be performed according to relevant VDE and
local electricity board regulations.
•Disconnect the system from the mains before
connecting the instrument.
•Add a fuse adapted to the energy requirements.
4-wire connection
Operating voltage 230 VAC / 115 VAC / 24 VAC
3-wire connection
Operating voltage 24 VDC
2-wire connection
Operating voltage 24 VDC
5 Commissioning
All electrical supply, operating and measuring lines,
and the pressure connections must have been cor-
rectly installed before commissioning. All supply
lines are arranged so that there are no mechanical
forces acting on the instrument.
Check that the pressure connections do not leak
before commissioning.
5.1 Pressure surge absorption
In the case of pulsating pressure on the system
side, wear and functional impairments to the in-
strument may occur. As a protective measure, we
recommend the installation of damping elements in
the pressure connection lines.
The installed cutting ring or hose connections are
removed and the damping reactor is installed in-
stead (see fig.). Then the dismantled cutting ring or
hose connections can be remounted.
Internal jump
Operating voltage/output
Switch outputs
Operating voltage
Output
Switch outputs
Operating voltage
Output

4-12 | Page
In the operational status, the reactor pins need to
be set so that the measurement display follows the
pressure changes with a delay.
5.2 Operating elements
After opening the lid of the casing, the operating el-
ements are arranged as follows:
5.2.1 Display range
N
Zero point
S
Steepness
5.2.2 Measuring range and switch points
1
Actual value
N
Zero point
2
Switch point K1
S
Steepness
3
Switch point K2
5.3 Adjustment of the zero-point and
measuring range
The differential pressure transmitter is delivered
with factory settings. They do not usually need to be
adjusted at the assembly site.
If the output signal does need to be adjusted,
please proceed as described below.
5.3.1 Linear output signal
•Remove the lid of the casing.
•Measure the output signal by connecting a cur-
rent or voltage measuring instrument between
the terminals 11 and 12.
•Connect the operating voltage between the
terminals 9 and 10 and switch it on.
In the case of two-wire instruments, the current
measuring instrument needs to be switched in
series to the operating voltage source.
•Reduce the pressure in the measuring system
until the start of the measuring range has been
reached. The corresponding value (0/4 mA or 0
V) appears on the display of the measuring in-
strument. In the case of any deviations, the
output signal can be set with the zero-point po-
tentiometer.
•Increase the pressure in the measuring system
until the end of the measuring range has been
reached. The corresponding value (20 mA /
10 VDC) appears on the display of the measur-
ing instrument. In the case of any deviations,
the output signal can be set to the end value via
the steepness potentiometer.
Settable damping reactors MZ41
Measuring range
Switch points
Coding switch
LC display
Coding switch
Measuring range
Switch points

P a g e | 5-12
•It is sensible to check the zero point and meas-
uring range end value again (adjust if neces-
sary).
•Remount the lid of the casing.
5.3.2 Rooted output
The zero point and the measuring range are adjust-
ed in the same way as the linear output (see
above).
The only difference is that a check is carried out in
the measuring range midpoint.
When the pressure is set accordingly in the meas-
uring system, the measuring device needs to dis-
play one of the following values in the output.
Output signal
Measured
value
Tolerance
0 … 20 mA
14.14 mA
± 0.20 mA
4 … 20 mA
15.31 mA
± 0.16 mA
0 … 10 V
7.07 V
± 0.10 V
5.4 Setting the switching points
The instrument has a coding switch on the main
PCB (bottom right) and one or two setting potenti-
ometers (depending on the model) for setting the
switching points.
The coding switch can be used to set the value that
is to be displayed.
The actual value is displayed in switch position 1.
The respective switch points are shown in the two
other switch positions (2 and 3).
The setting is made as described below:
5.4.1 Switch point K1
•Remove the lid of the casing.
•Switch on the operating voltage.
•Set the coding switch to position 2. The display
now shows switch point K2.
•Set the switch point to the required value.
•Set the coding switch back to position 1. The
display now shows the current measured value
again.
•Remount the lid of the casing.
5.4.2 Switch point K2
The switch point K2 is set in the same way as
switch point K1 (see above). However different in
code switch setting 3.
6 Maintenance
The instrument is maintenance-free.
We recommend checking the instrument at regular
intervals to ensure reliable operation and a long
service life.
•Check the reading.
•Check the switching function in combination
with downstream components.
•Check the pressure connections lines for leaks
•Check the electrical connection (cable clamp
connection).
The precise test cycles need to be adapted to the
operating and ambient conditions. If various instru-
ment components interact, the operating instruc-
tions of all the other instruments also need to be
observed.
7 Transport
The instrument must not be exposed to mechanical
shocks. It shall be transported only in packaging
specifically intended for transport.
8 Service
All damaged or faulty instruments shall be directly
sent to our repair department. Please coordinate all
shipments with our sales department.
Process media residues in and
on dismantled instruments can be a
hazard to people, animals and the envi-
ronment. Take adequate preventive
measures. If required, the instruments shall be
thoroughly cleaned.
9 Accessories
No accessories
10 Disposal
For the sake of the environment ....
Please help to protect our environ-
ment and dispose of or recycle used
instruments as required by the appli-
cable regulations.
Coding switch
Switch points

6-12 | Page
11 Technical Specification
General points
Measuring ranges
0 … 4 mbar to 0 … 600 mbar (see order code)
Max. stat. operating pressure
3 bar (see order code)
Max. pressure load
Over-pressure-proof up to permissible operating pressure
Measuring accuracy
± 1 % of the measuring range
Temperature drift
0.5 % /10 K
Admissible ambient temperature
-10 °C to +60 °C
Admissible media temperature
-20 °C to +70 °C
Admissible storage temperature
-25 °C to +80 °C
Enclosure protection class
IP 54 as per DIN EN 60 529
Electrical data
Electrical connection type
Four-wire
Three-wire
Two-wire
Operating voltage
Rated voltage - tolerance
Rated voltage - tolerance
Rated voltage - tolerance
230 VAC
+10/-15%
115 VAC
+10/-15%
24 VAC
±10%
24 VDC
±10%
24 VDC
±10%
Output signal
0 … 20 mA
0 ... 10V
0 … 20 mA
0 ... 10V
4 … 20 mA
Load at rated voltage
max. 800 Ω
> 2 kΩ
max. 800 Ω
> 2 kΩ
max. 500 Ω
Current limiting
approx. 30
mA
approx. 30
mA
approx. 30
mA
approx. 30
mA
approx. 30
mA
Voltage limit
-
approx. 12 V
-
approx. 12 V
-
Power consumption
approx. 3 VA
approx. 3 VA
approx. 3 VA
approx. 3 VA
≤ 0.75 W
Characteristic curve
Root extraction of the output
±0.5 %
with slow-feed suppression
2% is set
Steepness adjustment
approx. 10 % of the measuring range
Zero-point adjustment
approx. 10 % of the measuring range
Measured value display / contact elements
Display
3 ½ -digit LC-Display
Switch point setting
The digital display can be switched between the actual differential pressure value and the
switch point settings by means of a selector switch. The Output I or Output II can be selected.
The digital display now shows the applicable set target value. The target values can be set
over the entire measuring range.
Switch point hysteresis
approx. 2%
Switching output
1 or 2 potential-free changeover contact
Load data of the contacts
AC
DC
Umax
250V
30V
Imax
2 A
2 A
Pmax (resistive load)
250 VA
60 W
Connections
Process connection
Inner thread G 1/4, Hose screw connections made of Al, 6/8 mm
Cutting ring screw connections made of MS for 6 or 8 mm pipes
Electr. connection
Internal terminal strip, cable opening with M16 x 1.5
Plug connections on request
Materials
Casing
Cast aluminium, painted
Hood
ABS –self-extinguishing
Measuring element
Diaphragm capsule made of CuBe 2
Assembly
Install vertically if mounted to walls
Zero-point correction recommended if installed in a different position

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12 Dimensional drawings
M16x1.5 screw connection
Assembly boreholes Ø 4.5
(All dimensions in mm unless otherwise stated)

8-12 | Page
13 Order Codes
Differential pressure transmitter
DE50
Measuring range Stat. operating pressure
0 ... 1.6 mbar 8 mbar (Cl.:2.5)......>
9
7
0 ... 2.5 mbar 8 mbar (Cl.:2.5)......>
9
8
0 ... 4 mbar 20 mbar ...................>
5
2
0 ... 6 mbar 30 mbar ...................>
5
3
0 ... 10 mbar 50 mbar ...................>
5
4
0 ... 16 mbar 80 mbar ...................>
5
5
0 ... 25 mbar 125 mbar ...................>
5
6
0 ... 40 mbar 200 mbar ...................>
5
7
0 ... 60 mbar 300 mbar ...................>
5
8
0 ... 100 mbar 500 mbar ...................>
5
9
0 ... 160 mbar 800 mbar ...................>
6
0
0 ... 250 mbar 1200 mbar ...................>
8
2
0 ... 400 mbar 2000 mbar ...................>
8
3
0 ... 600 mbar 3000 mbar ...................>
C
1
-1 ... 0.6 mbar 5 mbar ...................>
C
2
-1 ... 5 mbar 30 mbar ...................>
C
3
-4 ... 6 mbar 50 mbar ...................>
5
0
-10 ... 6 mbar 80 mbar ...................>
6
3
-20 ... 40 mbar 300 mbar ...................>
6
8
-40 ... 60 mbar 500 mbar ...................>
7
0
-100 ... 60 mbar 800 mbar ...................>
7
3
-250 ... 150 mbar 2000 mbar ...................>
7
7
0 ... 160 Pa 800 Pa ...................>
D
5
0 ... 250 Pa 1250 Pa ...................>
D
6
0 ... 400 Pa 2000 Pa ...................>
D
7
0 ... 600 Pa 3000 Pa ...................>
D
8
0 …1000 Pa 5000 Pa ...................>
D
9
0 …1600 Pa 8000 Pa ...................>
E
1
0 ... 2.5 kPa 10 kPa ...................>
N
3
0 ... 4.0 kPa 20 kPa ...................>
N
4
0 ... 6.0 kPa 30 kPa ...................>
N
5
0 ... 10 kPa 50 kPa ...................>
E
5
0 ... 16 kPa 80 kPa ...................>
E
6
0 ... 25 kPa 120 kPa ...................>
E
7
0 ... 40 kPa 200 kPa ...................>
E
8
0 ... 60 kPa 300 kPa ...................>
F
1
Pressure connection
Inner thread G 1/4 ...................................................................>
0
1
Cutting ring screw connection in brass for 6 mm pipe..............>
2
8
Cutting ring screw connection in brass for 8 mm pipe..............>
2
9
Cutting ring screw connection in brass for 10 mm pipe............>
3
0
Aluminium screw connection for 6 / 4 mm hose.......................>
4
0
Aluminium screw connection for 8 / 6 mm hose.......................>
4
1
Electrical output signal
0 –20 mA 3-wire (STANDARD) ...........................................................>
A
4 - 20 mA 2-WIRE, only 24 V DC,
without contacts, without root extraction ...............................................>
B
0 –10 V DC 3-wire (STANDARD) ........................................................>
C
0 - 20 mA rooted, 3-wire connection .................................................>
E
4 - 20 mA rooted, 3-wire connection .................................................>
F
0 - 10 V DC rooted, 3-wire connection................................................>
G
4 –20 mA 3-wire (STANDARD) ...........................................................>
P
Operating voltage
230 VAC +10%/-15%..................................................................................>
1
115 VAC +10%/-15%..................................................................................>
2
24 VAC ±10%.............................................................................................>
4
24 VDC ±10%.............................................................................................>
9
Measuring value display/switching elements
Without measuring value display/switching elements........................................>
0
3½-digit measured value display.......................................................................>
1
3½-digit measured value display with a potential-free contact...........................>
2
3½-digit measured value display with two potential-free contacts.....................>
5
Electrical connection
Inner terminal strip..................................................................................................>
E
M12 plug connection (only for 24 V AC/DC)............................................................>
M

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14 Declaration of conformity

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Technische Änderungen vorbehalten • Subject to change without notice • Changements techniques sous réserve
Fischer Mess- und Regeltechnik GmbH • Bielefelder Str. 37a • D-32107 Bad Salzuflen • Tel. [phone] • Fax [phone] •
eMail: [email protected] • www.fischermesstechnik.de