"Remote Seal" Installation; Installation Of The Remote Seal With The Capillary Line - Siemens SITRANS P310 with HART Compact Operating Instructions

3.4

"Remote seal" installation

3.4.1 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 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.
For the maximum permissible pressure at higher temperatures, please refer to the standard specified on the remote
•
seal.
Using remote seals with pressure measuring device for hazardous areas:
● When using remote seals with pressure measuring device for hazardous areas, the permissible limits of ambient
temperatures for the pressure transmitter must not be exceeded. Hot surfaces on the cooling section (capillaries or
cooling elements) are a possible source of ignition. Initiate suitable measures.
● When remote seals with a flame arrestor are used, the pressure measuring instrument determines the permissible
ambient temperature. In the case of potentially explosive gaseous atmosphere, the temperature around the flame
arrestor must not exceed +60 °C.
3.4.2

Installation of the remote seal with the capillary line

Notes
● Do not rest the measurement assembly on the capillary line.
● Do not bend capillary lines; risk of leakages and/or risk of considerable increase in the setting time of the measuring
system.
● Owing to the risk of bending and breakages, pay attention to mechanical overloads at the joints such as capillary line-
remote seal and capillary line-measuring device.
● Unwinding the excess capillary lines with a radius of at least 150 mm.
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SITRANS P310 with HART
A5E35075329-01, 05/2015