Bartec APEXmv 07-37A2-2211 730 Series Operating Instructions Manual page 63

Ex p configuration
8.3.1.2 Setting the "Purge time"
Page 62 of 80
The procedure described here for determining the purging time is based
on the principle of manual purging time calculation
- All relevant parameters are assumed values -
Ex p control with application proportional purge gas valve
When using a proportional purge gas valve, the achieved purge pressure p3 is
achieved by adjusting the internal pressure to the value 7/8 of p5.
This means that the internal pressure can be finely adjusted during purging
with the aid of the proportional valve, which can be advantageous for
pressure-sensitive assemblies in the front of the pressurized equipment.
Procedure
 Connect PC with Ex p control unit, activate programming switch
 Login to the WEB interface with the user level
 Call up the Purge parameter / Pressure parameter menu
 Pressure parameter p3 - set purge pressure to 2000 Pa (20 mbar)

Pop-up window with display of changed value appears, Confirm
 Pressure parameter p5 - maximum pressure, purge set to the value,
which the pressurized equipment is allowed during purging,
e.g. set 2000 Pa (20 mbar).

Pop-up window with display of changed value appears, Confirm

Deactivate programming switch

Ex p Control unit changes from programming mode to
control/monitoring mode.
 Press the "F5" key of the PC to refresh the browser window.
 Start screen opens.
 Note the actual value of the p3 purge pressure, as example 5 mbar.
Operating instructions Chapter Opening the purge air diagram
Read out the corresponding flow rate Q as a function of the
determined p3 from the diagram. As example 2000 l/h
Using the formula
t [min] = ((V [l] x factor purging) / Q [l/h]) x 60
7.5 min = ((50 l x 5 times purging) / 200 l/h) x 60
 Pop-up window with display of changed value appears, Confirm
 Activate programming switch
 Login into the WEB interface with the user level
 Call up the Purge parameter / Pressure parameter menu
 Pressure parameter p3 - Set purge pressure to determined value

Pop-up window with display of changed value appears, Confirm
 Call up the Purge parameter / Purge mode menu
 Set the purge time to the calculated purge time

Pop-up window with display of changed value appears, Confirm
01-37A2-7D0005_MV_Manual_Exp-Control-Unit_2021005_0_en.docx
Ex p Control unit
APEX mv
Rev. 0