Ex p Control unit
SILAS
pz
Commissioning
Rev. 0
A1-37S2-7D0001_pz_Manual_Exp-Control-Unit_20210923_0_en.docx
Page 67 of 88
Setting the “Purge program / Purge mode”
DANGER
DEATH OR SERIOUS BODILY INJURY FROM USE OF AN IMPROPER FLUSH
MODE.
Explosion risk.
Only activate rinsing programs suitable for the application.
Purge programs Ex_p_3, Ex_p_6, Ex_M_1 and Ex_M_2 are special
purge modes, which must not be used for standard applications.
Within the "Purge parameters / Purge mode" web interface, the purge mode as
well as the sequence control can be adjusted.
The precondition for all purge programs, so that the further
phases are initiated, is that po > p1 is.
Procedure
Connect PC with Ex p control unit, activate programming switch
Logging into the WEB interface with the user level
Call up the Purge parameter / Purge mode menu
Select purge program by clicking the left button
Purge program Ex_p_1 by clicking the button
Button changes from to
Confirm pop-up window with changed value
Purge mode should be set to " Manuel" for the purge described here.
Setting the “Purge time”
The procedure described here for determining the purging time is based
on the principle of manual purging time calculation
Assumptions for the determination of the purge time:
- All relevant parameters are assumed values -
Ex control with application digital purge gas valve
When using a digital purging gas valve, reaching the purge pressure p3 is set
by means of the mechanical limitation of the purging gas nozzle. The table in
section 5.4 shows guideline values for the bore diameters based on the
protected enclosure volume.
In deviation from this table, the purging gas nozzle can also be drilled out
step by step to achieve the desired purge pressure p3.
As the drilling diameter of the purging gas nozzle increases, the volume of
purging gas supplied increases and thus the purging pressure p3 achieved is
greater.