Commissioning
Ex p Control Unit
SIEMENS Set
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01-37A2-7D0004_SIEMENS_Manual_Exp-Control-Unit_20220216_0_en.docx
Rev. 0
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Pre Configuration Ex p control unit “SIEMENS Set”
The Ex p control unit is factory-set for the use of SIEMENS
analyzers of the 6 series.
The Ex p control unit performs purging with the parameters specified in the
SIEMENS certificate. After purging has been completed, the operating phase of
the protected equipment is initiated and the equipment is purged with the
specified minimum quantity of purge gas.
Procedure:
Purge phase
Manual purge is based on the fact that the values for purge time and pressures
are permanently stored in the device.
The set values must be exceeded or fulfilled for the Ex p control to run correctly.
Dilution phase
After purge is complete, the Exp control unit switches to a reduced amount of
purge gas flow, diluting any escaping gases.
If the amount of continuous flow of purge gas is insufficient, the internal
pressure of the Ex p protected equipment drops below the preset level and the
purge gas valve opens intermittently to maintain flow.
