d e v e l o p i n g s o l u t i o n s
*09005076*
BA_EN_DE39
Rev.B
03/19
*09005076*
Table of contents
1 Safety Instructions
2 Application Purpose
3 Description of the Product and Functional Description
4 Installation and Assembly
5 Commissioning
6 Maintenance and Repeat Tests
7 Transport
8 Service
9 Accessories
10 Disposal
11 Technical data
12 Dimensional drawings
13 Order Codes
14 Manufacturer's Declarations and Certificates
1 Safety Instructions
1.1 General
This operating manual contains instructions fundamental to the installation,
operation and maintenance of the de-
vice that must be observed unconditionally. It must be read by the assembler, operator
and the specialized personnel in charge of the device before it is installed and put into operation.
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 instructions on assembly, commissioning and maintenance, contain important safety instructions, nonobservance of which can endanger persons, animals, the environment and physical objects.
1.2 Personnel Qualification
The device 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 relevant 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 system 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
device 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. For more information, please see the applicable
national and international regulations.
In Germany these are the DIN, EN, accident prevention regulations (UVV) and - for industry-specific
individual applications - also in the industry guidelines issued by the DVWG, Ex, GL, etc. as well as
VDE and local EVUs.
Operating Manual
DE39
Digital differential pressure transmitter
With internal pressure sensors
2 | 12 Page
1.5 Unauthorised Modification
Modifications of or other technical alterations to the
device by the customer are not permitted. This also
applies to replacement parts. Any modifications / alterations required must be carried out by Fischer
Mess- und Regeltechnik GmbH only.
1.6 Inadmissible Modes of Operation
The operational safety of this device can only be
guaranteed if it is used as intended. The device
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 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
WARNING!
… indicates a potentially dangerous
situation, non-observance of which
could endanger persons, animals, the
environment or objects.
INFORMATION!
… highlights important information efficient and smooth operation.
TIP!
… indicates recommendations that are
not specifically necessary in certain
situations but which could be useful.
2 Application Purpose
Transmitter with analogue output and display, and
switching unit for differential pressure for liquid and
gaseous media.
3 Description of the Product and Func-
tional Description
3.1 Function Diagram
3.2 Design and mode of operation
The unit is based on an electronic analysis switch
that analyses the measuring signals from two integrated pressure sensors. The signals of the pressure sensors can be displayed separately for testing.
The integrated pressure sensors work with ceramic
pressure measuring cells. The signals are digitalised and made available to the analysis unit for further processing.
The main task is to calculate the differential pressure that can be displayed and analysed. The analysis allows the configuration of two independent
switching points and the provision of an output signal that is proportional to the differential pressure.
The rated pressures of the integrated sensors and
the differential pressure measuring range are set
ex-works and shown on the type plate. The differential pressure measuring range can be spread 10:1.
4 Installation and Assembly
The device is designed for installation onto flat assembly plates. For screw connection to the assembly plate, the device features four assembly bores
on its back, which can be used for Ø 3.5 mm tapping screws.
Optionally, the device can be supplied with a wall
mounting plate (see order code).
The casing protection class IP65 is only guaranteed
if a suitable connection cable is used.
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.
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4.1 Process connection
• By authorized and qualified specialized person-
nel only.
• The pipes need to be depressurized when the
device is being connected.
• Appropriate steps must be taken to protect the
device from pressure surges.
• Check the suitability of the device for the media
to be measured.
• Maximum pressures must be observed.
• Check that the pressure connections do not
leak before commissioning.
The pressure sensing lines need to be kept as short
as possible and installed without sharp bends to
avoid interfering delay times.
The pressure connections are marked with (+) and
(-) symbols on the device. For differential pressure
measurements, the higher pressure is connected to
the (+) side and the lower pressure to the (-) side of
the device.
4.2 Electronic connection
• By authorized and qualified specialized person-
nel only.
• The electrical connection of the device shall be
performed according to relevant VDE and local
electricity board regulations.
• Disconnect the system from the mains before
connecting the device.
• Add a fuse adapted to the energy requirements.
4.2.1 3 wire connection
4.2.2 Socket assignment
Pin
Signal name
Cable colour
1
Supply
+Ub brown
2
Delivery
-Sig white
3
Supply
-Ub blue 4 Delivery
+Sig black
5
n.c.
A Coding
B Bridge
4.2.3 Switching outputs
Pin
Signal name
Cable colour
1
Switch output 1
SP1 brown
2
Switch output 2
SP2 white
3
Switch output 2
SP2 blue 4 Switch output 1
SP1 black
A
Coding
5 Commissioning
All electrical supply, operating and measuring lines,
and the pressure connections 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.
5.1 Display
Pos
Designation
1
Display function
2
Status display of the switching outputs
3
Measured Value Display
4
Measuring value unit
5
Keyboard
The 3½ digit LED display shows the current differential pressure in normal mode. The symbols P1
and P2 on the left next to the display are backlit depending on the selected display function (see
5.3.2.).
Output
0/4…20 mA
0…10V
DE39
Supply
+U
b
-U
b
+Ub
- Ub / -Sig
+Sig
4 | 12 Page
The selected measuring unit is backlit to the right of
the display. Two light diodes above the display symbolise the status of the switching outputs
(LED shines = switch is closed).
When configuring the parameters, the display either
shows the respective menu point or the associated
parameter value. The device continues to work
whilst the parameters are being set; apart from two
exceptions, the changes come into effect immediately.
The exceptions are a change in the switching times
- the previously valid time must run down - and a
change in the support point table (see 5.3.8). In this
case, all output signals and switching statuses are
frozen until the changes have been completed.
Please note that for a 3½ digit display, only numbers between -1999 and +1999 can be shown.
5.2 Operating keys
The operating keys have the following function:
ÿ
Page down menu
Reduce value
û
Enter key
þ
Page up menu
Increase value
By using the middle û key on the membrane keypad you can access the parameter menu (setting
mode). The reading now shows the text ESc.
Press the right button þ to move upwards in the
menu and select a large range of parameters.
Press the left button ÿ to move downwards in the
menu, return to the parameters by pressing esc.
Press the middle key û to call up a parameter.
You can set the parameter value using the keys ÿ
and þ.
To confirm a set parameter value, press the key û.
All set parameters are only saved when the user
leaves the parameter menu via esc.
5.3 Parameters
For commissioning there is a multitude of setting
options for optimum adaptation of the device to the
measuring point and task at hand. This section covers these options step by step.
Depending on the current device model, some
menu items may not be available. For instance, all
characteristic curve functions are hidden in the
menu if the device does not have a signal output.
The device can also be completely configured easily on the PC via a Transmitter PC Interface EU03.
Here, all parameters are directly visible and accessible. Also, the entire configuration can be loaded,
saved and documented in a printout. For more in-
formation about this program, please refer to the
documentation on the Transmitter PC Interface.
5.3.1 Selecting the pressure unit
First select the required pressure measuring unit.
The currently valid unit is backlit on the right next to
the display. To make the settings, press the middle
button û and then search for the parameter EIN via
the right button þ. Then press û again and change
the display value via þ or ÿ . After selection, save
the value with û and EIN appears again in the display.
Then leave the configuration mode. Press ÿ until
ESc appears and then û. The pressure currently
measured is now shown. The correct pressure unit
should be backlit to the right of this figure.
The display range is restricted to ±1999.
Therefore, it may not be possible to select all defined pressure units in some
cases.
5.3.2 Display setting
In DE39 the differential pressure is calculated by
subtracting two relative pressures P1 and P2. In
some cases it is helpful if these values can be
viewed separately. You can select the display value
with the dSP parameter.
Parameter
dSP = 0
shows the relative pressure P1
(Symbol P1 shines)
dSP = 1
shows the relative pressure P2
(Symbol P2 shines)
dSP = 2
shows the differential pressure at P1-P2
(Symbols P1 and P2 shine).
This value is the default value
5.3.3 Zero-point control and adjustment
Because the differential pressure can be blanketed
by static pressures due to the arrangement of the
two external pressure sensors, the differential pressure when the system is in an idle state is not always zero.
The current differential pressure can be set to zero
via the menu item -0-.
The value saved in this parameter is subtracted
from the measured differential pressure, i.e. the
static differential pressure is eliminated. The display
now shows zero.
5.3.4 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 effect of the DAM parameter corresponds to a
capillary throttle. However it only impacts on the
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