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2 6 6 D D S H A R T | P R E S S U R E T R A N S M I T T E R S | O I/ 2 6 6 D D S - E N R E V. B
4 Mounting
General
Study these installation instructions carefully before
proceeding.
Failure to observe the warnings and instructions may cause a
malfunction or personal hazard. Before installing the
transmitter, check whether the device design meets the
requirements of the measuring point from a measurement
technology and safety point of view.
This applies in respect of the:
• Explosion protection certification
• Measuring range
• Gauge pressure stability
• Temperature (Ambient and Process)
• Operating voltage
The suitability of the materials must be checked as regards
their resistance to the media. This applies in respect of the:
• Gasket
• Process connection, isolating diaphragm, etc.
In addition, the relevant directives, regulations, standards, and
accident prevention regulations must be observed.
Measurement accuracy is largely dependent on correct
installation of the pressure transmitter and, if applicable, the
associated measuring pipe(s). As far as possible, the measuring
setup should be free from critical ambient conditions such as
large variations in temperature, vibrations, or shocks.
IMPORTANT
If unfavorable ambient conditions cannot be avoided for
reasons relating to building structure, measurement
technology, or other issues, the measurement quality may be
affected. If a remote seal with capillary tube is installed on
the transmitter, the additional operating instructions for
remote seals and the related data sheets must be observed.
IP protection and designation
The housings for 266DDS transmitters are certified as
conforming to protection type IP66 / IP67 (according to
IEC 60529) or NEMA 4X (according to NEMA 250).
The first number indicates the type of protection the
integrated electronics have against the entry of foreign bodies,
including dust.
"6" means that the housing is dust-proof (i.e., no ingress of
dust).
The second number indicates the type of protection the
housing has against the entry of water.
"6" means that housing is protected against water; specifically,
powerful jets of water under standardized conditions.
"7" means that the housing is protected against the effects of
temporary immersion in water under standardized water
pressure and temporal conditions.
The device and its accessories (i.e. cable glands and other
electrical connections) must be carefully and duly tightened to
meet expected IP protection type.
When using/mounting cable glands, they have to meet
expected IP rating.
Mounting the transmitter
Transmitter factory configuration consideration
The 266DDS pressure transmitter in your hands has been
factory calibrated to reflect the published declared
performance specification; no further calibration is required in
normal condition. ABB typically configures 266DDS pressure
transmitters according to the user requirements. A typical
configuration includes:
• TAG number (long tag number, interconnects the primary
and secondary devices)
• Calibrated span
• Output linearization
• LCD display configuration
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