ABB Instrumentation
Specification sheet Kent-Taylor Deltapi N Series
Pneumatic Transmitters
Model NEA
Pressure transmitter
The blind type pressure transmitter, mod. NEA, is used to
measure a pressure and convert it into a proportional
pneumatic signal.
The instrument works on the force-balance principle and
consists of two main units:
the measuring unit consists of a Bourdon Tube assembly
housed in a cast iron primary unit enclosure which has an
aluminium gasketed cover. The connection block is welded to
the root of the tube.
The measuring element can withstand the maximum
overrange without damage.
the transmission unit converts the differential force applied to
the measuring element into a proportional output pneumatic
signal.
The output pressure, generated by a flapper nozzle relay, is fed
to a feedback bellows with a rising pressure until the bellows
force balances that of the measuring element.
Span value continuously adjustable by an internal micrometric
screw.
Zero value adjustable by an external screw.
Mounting in a vertical position on 2in diameter pipe by a
special bracket.
OPTIONAL EXTRA FEATURES
A zero suppression device allows to set as a zero of the
transmitter a measured variable value different from zero. The
sum of the zero suppression value (S) plus the calibrated span
cannot exceed the upper range limit (M) suitable by the
Bourdon Tube :
S + span ≤ M (see table).
Air filter regulator can be directly mounted on the transmitter,
with or without output gauge, and connected with piping and
fittings either in stainless steel or copper.
GENERAL CHARACTERISTICS