Siemens SIPROCESS GA700 Compact Operating Instructions page 116

Ex pz safety equipment
C.1 Ex pz safety equipment
minutes above.
With increasing inlet pressure resulting in higher purge flow the pre-purging time gets less.
Absence of flammable gases
Always ensure the absence of flammable gases inside the GA700 wall housing before powering
on the GA700 device.
Attach air supply or inert gas to air inlet (2). Take care that the purging gas supplied is clean,
dry and regulated to 2200 hPa relative +- 10 % at the air inlet (2). Ensure a stable pressure at
the inlet.
Always ensure a constant flow higher than 1 Nl/min.
To do so, with closed enclosure and active purging, turn the flow control (3) counter-
clockwise until system status indication (1) turns red, which indicates insufficient flow. Now
turn the flow control (3) back clockwise until system status indication (1) turns green,
indicating a flow of > 1NL/min.
You will find the information relevant for installation and operation of the Ex p
safety equipment with the wall-mounted device in the corresponding manufacturer
documentation.
Better: Also, observe operating instruction of Z Purge Control System D712, ML 466.
Series 6, purging unit FM (Class I Div 2)
Classification
FM certificate
Reaction upon failure of pressure
System type
Operation mode
Type of enclosure
Enclosure surface
Pressure supply
Supply connections
Display (signal indicator)
Switching contact
Settings
Prepurging time
116
WARNING
Class I Division 2
Certificate of compliance
1X8A4.AE / 0B3A3.AE
Opening of switching contact, and alarm via signal indicator
(red display)
MiniPurge complete system
Continuous purging
Reinforced polycarbonate
RAL 7035 gray with transparent cover
Dry, oil-free air or inert gas with regulated pressure of approx.
2000 hPa (30 psi) at inlet of MiniPurge
Pressure via ¼ BSPP connection, pressure hose at least ½" or 12
mm
Pneumatically driven color signal: green/red
Via SPCO switch approved for Class I Division2
min. 0.5 hPa corresponding to min. purging gas flow of 1 to 2
l/min.
Defined by operator, and controlled manually
SIPROCESS GA700 rack and wall mounted devices
Compact Operating Instructions, 06/2023, A5E35134047-AB