2
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 defi-
ned process media. The limiting values of operating pa-
rameters, 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 organi-
zation regarding safety during installation, operation and
servicing must all be followed meticulously.
It is the responsibility of the users to ensure that only sui-
tably qualified and experienced technical personnel are
used for installation, operation and servicing of this
equipment.
2.
Intended Applications
Measuring transmitter with limit switching functions for
acquisition and transmission of lowest pressure and dif-
ferential pressure. The product must be used only for ap-
plications and under conditions specified by the
manufacturer. Please confer with Fischer Mess- und Re-
geltechnik GmbH prior to using this transmitter along with
polluted or aggressive media. For use with this media it
needs to be adjusted in every part with direct contact to
the media.
3.
Product Description and Functions
3.1.
Block Schematic Diagram
3.2.
Principles of Operation
The function of this transmitter is based on a capacitive
sensor element. Due to modern micromechanical manu-
facturing process this sensor is highly overpressure safe,
shock and vibration resistant and long-time stable.
The differential pressure acts on the sensor element and
effects a measuring signal. The electronic amplifier then
generates an electrical output signal of 0 / 4-20 mA. This
output signal is used for external data processing and is
shown on the LC-display e.g. in mbar.
The LC-display can also be used for indication and pre-
cise adjustment of the differential pressure dependent
switching functions. Both change-over contacts can be
adjusted to any value within the measuring range.
4.
Installation
4.1.
Process connections
• Only qualified technicians authorized for this type of
work should undertake installation.
• Only for intended mechanical process connection (for
model information see Type Plate of instrument).
• 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 pul-
sation damper).
• Ensure that the mechanical configuration and materi-
als of construction of the instrument are compatible
with the process media.
• Ensure that process pressure is always less than the
specified safe pressure rating.
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.
• Switch off electrical power to the plant before attemp-
ting 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 requi-
rements, and installed in a way that does not cause
physical stress to the instrument.
• Carefully check tightness of all pressure connections
before start-up.
1
2
3
4
1. Signal output
2. Option square rooted
3. 2 change-over
contacts
4. LC-display
Sensor element
