Siemens SITRANS P - Manual (Page 48)

SITRANS P measuring instruments for pressure
Transmitters for gage pressure for the paper industry
SITRANS P300 and DS III series
with PMC connection – Technical description
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Design
SITRANS P, DS III series
Device front view, SITRANS P DS III
The transmitter comprises a range of different components, de-
pending on the order specifications. The various options are
listed in the ordering information. The components described
below are the same for all transmitters.
The rating plate (3, Figure "Front view") with the Order No. is lo-
cated on the side of the housing. The specified number together
with the ordering information provide details on the optional de-
sign details and on the possible measuring range (physical
properties of built-in sensor element).
The approval label is located on the opposite side.
The housing is made of die-cast aluminium or stainless steel pre-
cision casting. A round cover is screwed on at the front and rear
of the housing. The front cover (6) can be fitted with a viewing
pane so that the measured values can be read directly on the
digital display. The inlet (4) for the electrical connection is lo-
cated either on the left or right side. The unused opening on the
opposite side is sealed by a blanking plug. The protective earth
connection is located on the rear of the housing.
The electrical connections for the power supply and screen are
accessible by unscrewing the rear cover. The bottom part of the
housing contains the measuring cell with process connection
(1). The measuring cell is prevented from rotating by a locking
screw (8). As the result of this modular design, the measuring
cell and the electronics can be replaced separately from each
other. The set parameter data are retained.
At the top of the housing is a plastic cover (5), which hides the
input keys.
SITRANS P300
The device comprises:
• Electronics
• Housing
• Measuring cell
Perspective view of the SITRANS P300
The housing has a screwable cover (3), with or without an in-
spection window depending on the version. The electrical termi-
nal housing, the buttons for operation of the device and, de-
pending on the version, the digital display are located under this
cover. The connections for the auxiliary power U
H
and the shield
are in the terminal housing. The cable gland is on the side of the
housing. The measuring cell with the process connection (5) is
located on the underside of the housing. Depending on the ver-
sion of the device, the measuring cell with the process connec-
tion may differ from the one shown in the diagram.
© Siemens AG 2008