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5.2.7 Flame Arrester Bypass Connection (Optional)
WARNING
Inlet pressure >100 hPa with open bypass.
Risk of severe injury!
Risk of explosion propagation!
• The bypass must only be open when the inlet pressure (P1 and P2) is <100 hPa.
• Provide two pressure controls (P1 and P2) enable to activate the solenoid valve
(MV6).
• If
Δ
P between P1 and P2 is >10 hPa, the bypass must be closed.
• Install the bypass according to the scheme below:
IN
FA
FA
DN50
DN80
DN50
GS
0601
GS
0602
DN40
(NC0100B)
DN50
(NC0200-0300B)
MV6
OUT
P1
IV
P2
COBRA
PMC
included in the delivery scope
not included in the delivery scope
P1 and P2 <100 hPa = bypass open
P1 = P2 (pressure double check)
bypass closed
bypass open
FA
Flame arrester
GS
Limit switch
IN
Suction connection
IV
Isolation valve
MV
Solenoid valve
OUT
Discharge connection
PMC
Pneumatic connection
• Electrically connect the two limit switches (GS/0601 and GS/0602) and the solenoid
valve (MV6), see
Electrical Connection of the Flame Arrester Bypass (Optional)
.
• Connect the pneumatic actuator connection (PMC) to a pneumatic system supply.
Connection size:
– G1/4
• Make sure that the supply air pressure is between 3 ... 6 bar.
Summary of Contents for COBRA ATEX NC 0100-0300 B
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