Remote Seal Installation - Siemens SITRANS P DS III Operating Instructions Manual

4.5 "Remote seal" installation
4.5.1

Remote seal installation

General installation instructions
● Keep the measuring system in the factory packing until it is installed in order to protect it
from mechanical damage.
● When removing from the factory packing and installing: ensure that damage to and
mechanical deformations in the membrane are prevented.
● Never loosen the sealed filling screws on the remote seal and the measuring instrument.
● Do not cause damage to the remote separating membrane; scratches on the remote
separating membrane, e.g. due to sharp-edged objects, are the main starting points for
corrosion.
● Select suitable gaskets for sealing.
● Use a gasket having an adequately large inner diameter for flanging. Insert the gasket
concentrically; contact with the membrane leads to deviations in measurements.
● When using gaskets made of soft materials or PTFE: follow the guidelines of the gasket
manufacturer, especially regarding the tightening torque and setting cycles.
● At the time of installation, use suitable fastening components such as screws and nuts
that are compliant with fitting and flange standards.
● Excessive tightening of screwed joints on the process connection may displace the zero
point on the pressure transmitter.
Note
Commissioning
If a shut-off valve exists, open the shut-off valve slowly when commissioning in order to
avoid pressure surges.
Note
Permissible ambient and operating temperatures
Install the pressure measuring device such that the permissible limits of ambient and
measured medium temperatures are not overshot or undershot even with the
consideration of the effect of convection and heat radiation.
• Note the effect of temperature on the measuring accuracy.
• When selecting the remote seals, ensure that fittings and flange components have
• For the maximum permissible pressure at higher temperatures, please refer to the
SITRANS P DS III/P410 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00053276-08
adequate pressure-temperature resistance by selecting suitable materials and
pressure ratings. The pressure rating specified on the remote seal applies to reference
conditions according to IEC 60770.
standard specified on the remote seal.
Installing / mounting
4.5 "Remote seal" installation
53