Ex p Control unit
APEX
mv
Operation
Rev. 0
01-37A2-7D0005_MV_Manual_Exp-Control-Unit_2021005_0_en.docx
Page 49 of 80
7.8.1.2
Pressure parameter
The system pressures of the Ex p equipment are defined in the "Pressure
parameter" submenu.
po = Operating pressure. Pressure
value at which control takes place
during the operating phase.
p1 = Minimum pressure. Shut-off
value; if the pressure falls below this
value, the enable is reset.
p2 = Pre-alarm. Value at which an
alarm can be given before shutdown.
p3 = Purge pressure. Purge time starts
when the set point is exceeded.
p4 = Maximum pressure, operation. Depending on the selection of the purge
program, there is a shutdown or message.
p5 = Maximum pressure, purge. Depending on the selection of the purge
program, there is a shutdown or message.
7.8.1.3
Characteristic
DANGER
INCORRECT PARAMETERIZATION OF THE SYSTEM COMPONENTS IN THE EX P
CONTROL UNIT.
The purge process takes place with too low purge gas flow and there is a risk of
residual explosive gases within the Ex p equipment.
Check type and set characteristic
For automatic purge time
determination, the characteristics of
the pressure switch in the system
must be set in the Ex p control unit.
Selection table
Parameter
Measuring orifice
Characteristic 1
mv
