Depending on the preference of the end-user the pressure instruments can be connected separate to the process or via one common process tapping.

The Astava Interlocking Solutions can be used when your application needs an overall SIL 4 (or less).

Astava Interlocking Solutions are developed in compliance with end-user specifications.

One separate process tappings are available in the following configurations:

. 1 out of 1 (1x 1oo1)
. 1 out of 2 (2x 1oo1)
. 2 out of 3 (3x 1oo1)
. 1 out of 4 (4x 1oo1)
. 2 out of 4 (4x 1oo1)
. etc.

The available types of pressure instruments are:

. pressure transmitters
. pressure switches
. pressure transducers

The available types of measurement are:

. gauge pressure
. differential pressure
. flow with dp
. level with dp

A wide range of process connections are available:

. threaded (NPT, BSPP, etc.)
. flanged (IEC61518 and other standards)
. flanged (ASME, API and other standards)
. diaphragm sealed transmitter with remote seal or closed coupled
. welding

Some typical flowshemes: