2
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 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 impro-
per electrical or process connections. Detailed informa-
tion is available in relevant published norms (DIN EN,
UVW in Germany; and equivalents in other countries),
industrial standards such as DVWG, Ex-, GL-, VDE
guidelines, as well as regulations of the local authorities
(e.g., EVUs in Germany).
The instrument must be put out of action and protected
against accidental use if safe operation can not be gua-
ranteed anymore. A reason for this might be one of the
following incidents:
•
apparent damage of instrument
•
failure of electrical function
•
longer storage periods at temperatures higher than
85 C
•
bad packaging during transport
Repairing is only allowed to be done by Fischer Mess-
und Regeltechnik GmbH.
Before the instrument is put into operation again a
professional routine test acc. to DIN EN61010, part 1
needs to be done. This inspection should necessarily be
done by Fischer Mess- und Regeltechnik GmbH. Appro-
piate transport and professional storage of instrument
are understood.
1.5.
Modifications Forbidden
Modification or other technical alteration of the product is
not permissible. This also applies to the use of unautho-
rized 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 na-
tional regulations relating to accident prevention, and the
internal safety rules and procedures of the user organiza-
tion regarding safety during installation, operation and
servicing must all be followed meticulously.
It is the responsibility of the users to ensure that only su-
itably qualified and experienced technical personnel are
used for installation, operation and servicing of this
equipment.
2.
Intended Applications
Display and limit detection of differential pressure of ga-
ses. The DE45 must be used only for applications and
under conditions specified by the manufacturer.
Classification of Explosion-Hazardous Area
The differential pressure switch / transmitter DE45 is su-
itable as „electrical equipment for use in explosion-
hazardous areas (flammable gases)“, zone 2.
Declaration per Directive 94/9/EC (ATEX)
II 3 G EEx nA IIC T4
-10 C T
amb
60 C
3.
Product Description and Functions
3.1.
Functional Scheme
3.2.
Principles of Operation
The instrument is based on a piezo-resistive sensor
element and can measure positive gauge, negative
gauge (vacuum) or differential pressure. The pressure is
measured directly by a piezo-resistive resistance bridge
that is formed on the surface of the integral silicon dia-
phragm of the sensor. Change of pressure results in
change of resistance that is converted to a varying
voltage and then digitized. The instrument's internal
microcontroller transfers the measured value on the LED
Contact: EK Engineering (India)
Web: www.ekeindia.com
Email: [email protected]
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