Operation
Ex p Control unit
APEX
mv
Page 48 of 80
01-37A2-7D0005_MV_Manual_Exp-Control-Unit_2021005_0_en.docx
Rev. 0
WEB-Interface operating menu
Purge parameter
The "Ex p parameter / Purge parameter" menu contains the purge parameters.
This includes the submenus Purge mode, Pressure parameter, Characteristics
and enclosure parameters.
7.8.1.1
Purge mode
The Ex p sequence control is defined in the "Purge mode" submenu.
Manuel / Automatic = Determines
whether the Ex p control unit
performs purging with a fixed stored
or automatically determined purge
time.
Purge time = Fixed purge time of the
Ex p equipment
Delay time = Defines the delay time
for switching off the Ex p operating
equipment in the event of pressure
variation.
Purge factor = Parameter for the
number of purges of the Ex p volume
for automatic purge time averaging.
The automatic purge calculates automatically the corresponding purging time
during the initial purging phase based on the parameters enclosure size and
applied purging gas outlet stored in the Ex p control unit.
Manual purge is based on the fact that the values for purging time and pressures
are permanently stored in the device during initial commissioning. The purge
time is calculated and programmed by the commissioning engineer on the basis
of the determined flow rate and housing volume.
Purge programs gas application:
Progra
m
Use
Functions
Purge
phase
Purge time starts
when p3 is
exceeded
Purge time stops
when p5 is
reached
Ex p active
after
Ex p
inactive
after
Ex_p_1
Gas
Yes
Yes
Yes
Expiration
purge time
po < p1
po > p4
Ex_p_2
Gas
Yes
Yes
Yes
Expiration
purge time
po < p1
Ex_p_4
Gas
Yes
Yes
No
Expiration
purge time
po < p1
po > p4
Ex_p_5
Gas
Yes
Yes
No
Expiration
purge time
po < p1
