Supplement; Technical Data; Chemical Seal With Vacuum Applications; Supplement 6.1 Technical Data - Vega VEGADIF 65 Operating Instructions Manual

6

Supplement

6.1

Technical data

Materials
Diaphragm
Flanges
Capillaries
Protective hose for capillaries
Process conditions
Process pressure max.
Process temperature max.
6.2

Chemical seal with vacuum applications

Introduction
A chemical seal has two tasks:
•
Separation of the sensor element from the medium
•
Transmission of the process pressure hydraulically to the sensor element
The chemical seal is closed off from the medium with a metallic diaphragm. The interior space
between this diaphragm and the sensor element is completely filled with a pressure transmission
liquid. The chemical seal thus forms a closed system.
Vacuum
With decreasing pressure, the boiling temperature of the pressure transmission liquid decreases.
With pressure values < 1 bar
depending on the temperature. This causes measurement deviations.
For that reason, chemical seal systems can only be used to a limited extent in a vacuum, depending
on the pressure transmission liquid, process temperature and pressure. To extend the area of ap-
plication, we offer a so-called vacuum service as an option. The following graphics show the areas
of application for the different pressure transmission liquids.
Chemical seal CSB • for VEGADIF 65
316L, 316L with gold rhodium coating, Alloy C276
(2.4819), Tantalum, Titanium, Alloy 600 (2.4816), Duplex
(1.4462), Superduplex (1.4410)
316L
316Ti
304
see operating instructions manual of the respective
sensor
see operating instructions manual of the respective
sensor
, gas molecules dissolved in the isolating liquid may be released
abs
6 Supplement
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