Remote Seal - Siemens SITRANS P DS III Operating Instructions Manual

The inlet pressure (p
diaphragm
displacement changes the resistance of the four piezoresistors (bridge circuit) of the
absolute pressure sensor. The change in the resistance causes a bridge output voltage
proportional to the inlet pressure.
3.7

Remote seal

Product description
● A remote seal measuring system comprises the following elements:
● The measuring system based on a hydraulic principle is used to transfer pressure.
● The capillary line and the remote seal diaphragm are the most sensitive components in
● The smallest of leakages in the transmission system leads to the loss of transmission
● The loss of transmission fluid results in inaccuracies in the measurement and failure of
● In order to avoid leaks and measuring errors, please observe the installation and
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
) is transferred to the absolute pressure sensor
e
③
and the filling liquid
– Remote seal
– Transmission line, e.g. capillary line
– Transmitter.
Note
Malfunction of the remote seal measuring system
If you separate the components of the remote seal measuring system, this results in
malfunctioning of the system.
Do not separate the components under any circumstances.
the remote seal measuring system. The material thickness of the remote seal diaphragm
is only ∼ 0.1 mm.
fluid.
the measuring system.
maintenance instructions in addition to the safety notes.
④
, and displaces its measuring diaphragm. The
Description
3.7 Remote seal
⑤
via the seal
35