Dynisco IPX II Series, Operating Manual

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FUNCTION
Fig. 4-1 Fig. 4-1
Fig. 4-1 Fig. 4-1 Fig. 4-1 Operation in Block Form
Operation in Block Form
Operation in Block Form Operation in Block Form Operation in Block Form
In addition to the standard analog output, the IPX II Series supports remote digital communications
compatible with the HART Communicator (product of Emerson). The Model 275 can communicate
with IPX II Series transmitters from the control room, at the transmitter site, or from any convenient
junction box or wiring termination point in the measurement loop. The model 275 may be used to
configure the IPX II Series of transmitters or to test the control loop.
4.2.1 4.2.1 4.2.1 4.2.1 4.2.1 T TT TT
H E H E
H E H E H EORY
ORY
ORY ORY ORY
O F O F
O F O F O F
O O O O O
PERA PERA
PERA PERA PERATION
TION
TION TION TION
The IPX II Smart Pressure Transmitter is a microprocessor-based device capable of measuring process
pressure to within 0.15% of the specified range. It is compensated for temperature effects at the
process end as well as the electronics end by using RTD’s and compensating software customized
for each unit.
The IPX II Series can be broken down into two distinct subsections, mechanical and electrical. The
following describes each in detail.
4.2.2 4.2.2
4.2.2 4.2.2
4.2.2 M M
M M
M
E E E E E C H A N I C A L C H A N I C A L C H A N I C A L C H A N I C A L C H A N I C A L
The mechanical system (filled assembly) consists of a lower diaphragm, a filled capillary tube, and
an upper diaphragm with a sputtered thin film strain gage. The filled assembly transmits pressure
from the process to the strain gage diaphragm where it is converted to an electrical signal. The filled
assembly isolates the electronics from the high process temperatures. The el
The el
The el The el The electr
ectr
ectr ectr ectronic
onic
onic onic onics
ss
ss hou
hou
hou hou hous
ss
ssin
in
in in ing i
g i
g i g i g is
ss
ss
m m m m mat at at at ated w ed w ed w ed w ed with a s ith a s ith a s ith a s ith a spec pec pec pec pecific ific ific ific ific sen sen sen sen sensor a sor a sor a sor a sor as ss sssemb semb semb semb sembly ly ly ly ly. Do not . Do not . Do not . Do not . Do not mi mi mi mi mix xx xx and m and m and m and m and mat at at at atc cc cch hou h hou h hou h hou h hous ss ssin in in in ing g g g gs ss ss and sen and sen and sen and sen and sensor sor sor sor sors. s. s. s. s.
The lower diaphragm is the surface in contact with the media being measured. This diaphragm can
be made from a choice of materials. The standard material is heat-treated 15-5 stainless steel. This
has average corrosion and abrasion resistance and is similar to 17-4 stainless steel. Other materials are