FISCHER DE38D410, DE38 Instruction Manual
1 Safety Instructions
1.1 General
This manual contains detailed information about the product, and instructions for its installation, operation and maintenance. Operators
and other technical personnel responsible for the equipment must read this thoroughly before attempting to install or operate this
equipment. A copy of this manual must always be
kept accessible at the place of work for reference
by concerned personnel.
Chapter 1 (sections 1.2 through 1.7) contains general as well as specific safety instructions.
Chapters 2 through 10, covering topics ranging
from intended purpose of the equipment to its final disposal, also include important points relating to safety. Overlooking or ignoring any of these safety points can endanger humans and animals, and possibly cause damage to other equipment.
1.2 Personnel Qualification
Personnel responsible for installation, operation,
maintenance and inspection of this product must
have the qualifications, training and experience
necessary to carry out such work on this type of
equipment.
1.3 Risks of Disregarding Safety Instructions
Disregarding safety instructions, use of this product for purposes for which it is not intended,
and/or operation of this product outside the limits
specified for any of its technical parameters, can
result in harm to persons, the environment, or the
plant on which it is installed. Fischer Mess- und
Regeltechnik GmbH will not be responsible for
consequences in such circumstances.
1.4 Safety Instructions for Operators
Safety instructions for the proper use of this product must be followed. This information must be
available at all times to by personnel responsible
for installation, operation, maintenance and inspection of this product.
Adequate steps must be taken to prevent the
occurrence of hazardous conditions that can be
caused by electric energy and the convertible
energy of the process media. Such conditions
can, for example, be the result of improper
electrical or process connections.
Detailed information is available in relevant published norms (DIN EN, UVW in Germany; and
equivalents in other countries), industrial standards such as DVWG, EG-, GL-, VDE
guidelines, as well as regulations of the
local authorities ( e.g., EVUs in Germany).
# 09005136 26.03.2009 BA_D_DE38_D410
Ins tru ctio n M anu al
D E 3 8
D ig ita l D iffe re ntia l P re ss ure Tra nsm itte r / S witch
DE38D410
Inhalt
1 Safety Instructions .......................................1
2 Intended Applications...................................2
3 Product Description and Functions..............2
4 Installation....................................................2
5 Commissioning ............................................3
6 Maintenance ................................................8
7 Transport......................................................8
8 Service.........................................................8
9 Accessories..................................................8
10 Disposal.......................................................8
11 Specifications...............................................9
12 Dimensions ................................................11
13 CE-Certificate.............................................12
Contact: EK Engineering (www.ekeindia.com)
Email: india.eke@gmail.com
Mob: +91-9680966000
1.5 Modifications Forbidden
Modification or other technical alteration of the product
is not permissible. This also applies to the use of unauthorized spare parts for repair / maintenance of the
product. Any modifications to this product, if and as necessary, should be done only by Fischer Mess- und Regeltechnik GmbH.
1.6 Operational Restrictions
The operational reliability of the product is guaranteed
only when used for intended purposes. The product
must be selected and configured for use specifically
with defined process media. The limiting values of operating parameters, as given in the product specification
sheet, must never be crossed.
1.7 Safety Considerations during Installation and Maintenance
The safety instructions given in this manual, existing national regulations relating to accident prevention, and
the internal safety rules and procedures of the user organization regarding safety during installation, operation
and servicing must all be followed meticulously.
It is the responsibility of the users to ensure that only
suitably qualified and experienced technical personnel
are used for installation, operation and servicing of this
equipment.
2 Intended Applications
The product includes the functions of sensing, signal
conversion, display, signal transmission, and limit detection of pressure / differential pressure of gases and
liquids. The product must be used only for applications
and under conditions specified by the manufacturer. In
case of uncertainties, the user should consult the manufacturer before installing and using the product.
3 Product Description and Functions
3.1 Block Schematic Diagram
3.2 Principles of Operation
The instrument uses a tough, robust sensing diaphragm, which is qualified for over-, low- and differential pressure measurings. The comparative pressures
work on a elastic bedded measuring diaphragm. The diaphragm is at zero position when pressures on either
side of the diaphragm are equal.Inequality of pressures
results in deflecting the diaphragm towards the lower
pressure side until a new equilibrium determined by the
spring power is reached. This deflection is transmitted
by a tappet to the center of a inductive travel sensor.
The integrated electronics analyzes the deflection and
converts it into display, switch contacts and output signal.
4 Installation
The instrument is intended for the assembly on the
base of the Flender circulatory- measurement.
At the installation of the upper part there should be paid
attention to the correct adjustment. The operator must
be able to regulate and read the instrument from a safe
place.
The sealing faces and the O- ring seals must not be damaged!
The instrument is adjustet for a vertical mounting position. Other positions aren't sensibel because of the clearness of reading the digital display.
If the instrument is intended for outdoor application, we
highly recommend using an ade-quate protective housing (or at least a big enough shelter) as permanent
protection against UV-radiation on the membrane keyboard and against exposure of the instrument to rain or
snow.
4.1 Process Connections
Ensure that process equipment and pressure lines
are at atmospheric pressure before making pressure
connections.
The instrument should be provided with suitable pro-
tection against pressure surges (e.g., snubber or
pulsation damper).
Ensure that the mechanical configuration and mate-
rials of construction of the instrument are compatible
with the process media.
Take account of the maximum pressure.
Carefully check the pressure-tightness of all pressu-
re connections before start-up.
4.2 Electrical Connections
Only qualified technicians authorized for this type of
work should undertake installation.
Electrical connections must comply with relevant in-
ternational, national and local regulations and norms
relating to electrical and instrumentation installations.
2
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Switch off electrical power to the plant before at-
tempting electrical installation work of any kind.
Make electrical connections to the transmitter
through a suitable energy-limiting safety device (isolation or zener barrier).
5 Commissioning
Power supply and signal cabling to the transmitter
must be correctly selected to meet operational requirements, and installed in a way that does not cause
physical stress to the instrument.
Pressure lines must have a downward gradient
throughout from the pressure instrument to the process vessel / pipe. This is to prevent formation of air
/ gas pockets (for liquid applications) and liquid plugs
(for air / gas applications). If this continuous downward gradient cannot be provided for any reason,
then suitable water and / or air separation devices
must be inserted into the pressure lines.
Pressure lines must be kept as short as possible and
must not have short bends to avoid measurement
errors induced by pressure line delays.
5.1 Pressure Connections
If the pressure transmitter is subjected to pressure
when it is started up, zero point checking and adjustment is not possible. In such cases, only electrical connections of the instrument should be made, but not the
pressure connections.
5.2 Display
The 3½ digit LED display normally indicates the current
differential pressure. The backlit symbols to the right of
the 3½ digit LED display indicate the unit of pressure
measurement. (Note: the units shown in the illustrations
of this document can be different from those of the actual instrument). The two LED lamps above the 3½ digit
LED display respectively indicate the status of the two
limit relays / solid-state switches
(LED on = relay
contacts closed / solid-state switch on).
While the instrument is in set-up mode, the 3½ digit
LED display either indicates the selected menu option
or a set-up parameter value. The instrument continues
its pressure monitoring functions even while it is in setup mode, except under either of two circumstances.
One is when the limit switching delay time is changed:
the existing delay must time out first. The other is when
the look-up table (for conversion of measured values) is
re-programmed (s. 5.3.7.). In these circumstances, the
output signal value and the limit relay/switch states are
frozen until the changes are finalized.
5.3 Set-up
The instrument has comprehensive set-up options by
means of which it can be optimized for any specific
measuring or control application. This section of the
document provides information and instructions about
each of the set-up parameters.
Depending on the instrument configuration ordered (e.g.: without transmitter signal
output / with voltage signal output / with
current signal output) some of the menu
options may not available. Some set-up
parameters may be consequentially excluded. For
example, if the instrument is ordered without a transmitter output, all signal conversion programming options
are omitted in the set-up menu (s. 5.3.6. Signal Conversion and Transfer Functions).
All instrument settings can be conveniently done from a
PC connected to the instrument through a serial interface adaptor. All set-up parameters can be viewed and
changed on the PC screen. Also, the entire instrument
set-up configuration can be loaded, stored on the PC's
hard disk drive, and printed out for plant / process documentation purposes. Further information about this PC
software is given in the software documentation.
5.3.1 Selecting the Unit of Pressure Measurement
Make the necessary electrical connections (signal, power supply) to the instrument. Its pressure sensor must
be pressure-free (i.e. vented to atmosphere; typically by
disconnecting the pressure line/s).
The current valid unit of measurement is indicated by
one of the back-lighted symbols to the right of the digital
display. To change the unit of measurement, first press
then search for parameter EEEEIIIINNNN using . Next press
again and select another unit of measurement using
or . Then presse again to store the selection, and
EEEEIIIINNNN will appear again in the digital display.
To exit the set-up mode, press
until EEEESSSScccc appears, and
then press
. The current pressure measured value is
indicated again, and the appropriate symbol of the unit
of measurement (to the right of the digital display) is
lighted.
The digital display is limited to a count of
±1999. Therefore, all the available units of
measurement may not be suitable for se-
lection for a given application.
3
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5.3.2 Zero Point Checking and Adjustment
If the instrument has been de-pressurized (vented to atmosphere) and does not indicate precisely zero, note
this non-zero value. Using the set-up parameter OOOOFFFF1111,
you can trim this offset to exactly zero. If the indicated
non-zero value is positive, this value must be entered
and stored as a negative offset value, and vice versa.
If the instrument was in use before zero
setting is done, values of set-up parameters OOOOFFFF1111 and nnnnPPPP would have been previously programmed. In this case, set
both values to zero, read the actual zero
offset, and then use this value for OOOOFFFF1111 for zero point correction, as described in the previous paragraph.
Note: The registered value is a pure number: no decimal point is indicated.
After correcting the zero offset, the pressure connections can be made again.
5.3.3 Damping and Zero Stabilization
If the media is subject to excessive pressure fluctuations, the displayed readings and the transmitter output
signal can be stabilized using the instrument's DDDDAAAAMMMM and
NNNNPPPP set-up parameters.
The set-up parameter DDDDAAAAMMMM has the effect of a pulsation
damper (on the displayed measurements, output signal
and limit detection, - not on the sensor itself!). It adds a
time-constant (averaging filter) in the user selectable
range of 0.0 to 100.0 secs. When the damping is set to
maximum, it took more than 2 minutes to reach the final
value for a full scale pressure jump.
In many cases fluctuating pressure readings do not
cause a problem, except when the plant / equipment is
at zero (differential) pressure condition and readings
fluctuate near about zero value. The set-up parameter
NNNNPPPP is meant to take of this. Its value defines the number
range across zero (similar to the zero offset correction
number), within which the measured value is forced to
zero. If a value of 8 is set for NNNNPPPP any pressure measurement in the range -0.08 to +0.08 bar (or -8 to +8 kPa)
displayed as zero. Only when the actual pressure is
outside this range will the display indicate a non-zero
value. The actual and displayed pressures will agree
starting from double the value of the NNNNPPPP setting (in the
given example: 0.16 bar or 16 kPa).
5.3.4 Output Signal Setting
The transmitter output signal depends primarily on the
measured pressure. However, this signal can be adapted to meet users' application requirements precisely.
The basic pressure range (as marked on the product
identification label) and the type of output signal (voltage or current) always remain unchanged for a particular
instrument unit.
The set-up parameters MMMMAAAA (measuring range starting
point) and MMMMEEEE (measuring range end point) specify the
pressure values between which the measurements are
expected to be. Both values can selected anywhere
within the specified measuring range of the instrument
(e.g., 400 kPa). This user-programmed pressure range
will correspond to the output signal (current or voltage)
range, which will be as specified on the product identification plate: i.e., 0 ... 10V or 4 ... 20 mA.
If MMMMAAAA is lower than MMMMEEEE, the signal is said to have a positive slope: i.e., the output signal increases as the pressu-
re increases. If MMMMEEEE is lower than MMMMAAAA, the output signal
has a negative slope: i.e., the output signal decreases
as the pressure increases.
The difference between the values of MMMMAAAA and MMMMEEEE must be
at least 25% of the specified measuring range of the instrument (100 kPa for 400 kPa instrument example
mentioned above). The software does not permit a
smaller pressure span to be entered (the instrument will
not allow storing of, nor exit from an invalid span).
Note: If you change MMMMAAAA and/or MMMMEEEE the lookup table (s .5.3.6., 5.3.7.) that existed up
to that instant is deleted!
5.3.5 Output Signal Limiting (Namur)
The three set-up parameters ooooGGGG1111, ooooGGGG2222 and ooooEEEErrrr specify
the limits of the signal output current or voltage that are
not to be exceeded, irrespective of the actual pressure.
These limit values have higher priority than the MMMMAAAA and
MMMMEEEE pressure span settings.
These settings serve mainly to prevent control systems
from interpreting brief pressure excursions outside the
measuring range as error / fault events. ooooGGGG1111 sets the
output signal minimum value, and is useful only for a
4 ... 20 mA current signal, because sometimes a value
below 3.8 mA is defined as a sensor fault condition. ooooGGGG22
22
sets the upper signal limit and is valid for either current
or voltage signal (e.g., voltage signal output can be limited at 10.2 V).
An instrument fault condition can be transmitted as an
output signal value set as parameter ooooEEEErrrr. However, it
should be understood that not all instrument fault and
error conditions can be detected and signaled by the
self-diagnostic functions of the instrument.
5.3.6 Signal Conversion and Transfer Functions
In certain cases other process variables are derived
from primary pressure measurement. Examples are
flow rate derived from differential pressure across an
orifice plate, and liquid level derived from hydrostatic
pressure of liquid measured at the bottom of the tank.
Such derivations often involve non-linear transfer functions, while it is necessary for the output signal to be linearly proportional to the derived variable (e.g. liquid volume in a tank in m³, or flow rate in cm/sec).
The set-up parameter FFFF allows the user to select the appropriate signal conversion function from those
4
Contact: EK Engineering (www.ekeindia.com)
Email: india.eke@gmail.com
Mob: +91-9680966000
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