4
IM-P-20200626-01
<1. Introduction>
1.
Introduction
The EJA564E solid-state pressure and level
transmitters
are
based
on
a piezoresistive silicon
sensor, with a very high burst pressure. The
sensor element is mounted in a stainless steel
"
foot
"
. A temperature sensor is mounted inside the
foot to
and
is used
for
active temperature
compensation. A strong stainless steel “flush”
diaphragm protects the sensor from the process
medium. A
minimal
amount of special oil fills the
chamber surrounding the sensor and transfers
pressure from the flush mounted diaphragm to the
sensor
hydraulically.
Pressure on the sensor element creates a small
deflection of the silicon substrate and bridge network.
The resulting strain in the silicon resistors causes a
change in the bridge resistance that is proportional to
the pressure
being
applied. The transmitter
electronics detect this change in
the
bridge
resistance and converts
it into
the measured
value.
The amplifier system is
based on a single Integrated
Circuit, which ensures perfect linearity in the output,
all within an accuracy of 0.2 %.
1.1 Description
The EJA564E
transmitter is
specially designed with
a flush
mounted diaphragm so
it
fully meet the
needs of the food, pharma
ceutical, chemical and
other
industries. Standard wetted parts are made of
316L SST, other materials
are
also
available, like
Hastelloy C. Various process
connections can
be
adapted and available for manufacture;
(1.5”, 2” and 3”
tri-clamp
), SMS (1.5” and 2”), dairy
milk couplings (DN 25, 40 and 50), flanges (DIN and
ANSI) and sanitary weld-on nipples (ø 48, 62 and
85 mm.)
, among others.
Certain variants of the EJA564E are designed to be
non-clogging and are capable of being cleaned
inside. Various process connection types are
manufactured according to 3
-
A (74-06)
requirements such as Tri-Clamp and others.
1.2 Barometric Reference
The EJA564E is a “relative transmitter” which means
that barometric changes will not affect the zero.
The venting is placed in the cover of the electronics
housing next to the cable entry and is the filter for the
barometric reference to atmospheric pressure.
The vent
mechanism
must be kept clean.
