Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 19)

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This sequencing diagram is provided by BEBCO Industries, Inc., to explain the operations sequence
and LED status during purge operation. A graphic description is provided in the following pages.
LED STATUS 1
1. SYSTEM POWER
2. ENCLOSURE POWER OFF
3. ALARM SYSTEM ON
Bebco Industries, Inc.
4000 Series Purging System
Operations Flow Chart
SEQ. 1
POWER UP
SELF TEST - ALL LED'S FLASH
LED STATUS
"ON" ONLY
LED STATUS 2
1. SYSTEM POWER
2. ENCLOSURE POWER OFF
3. SAFE ENCLOSURE PRESSURE
SEQ. 2
FLOW SWITCH WARM UP CYCLE
SAFE PRESSURE LED FLASHES
SEQ. 3
FLOW SWITCH WARM UP CYCLE
COMPLETE
SAFE PRESSURE LED OFF
LED STATUS 1
SEQ. 4
SAFE PRESSURE ACHIEVED
LED STATUS 2
SEQ. 5
RAPID EXCHANGE SOLENOID
ENERGIZED
LED STATUS 3
SEQ. 6
RAPID EXCHANGE TIMER CYCLE
BEGINS
SEQ. 7
RAPID EXCHANGE TIMER CYCLE
COMPLETE
LED STATUS 4
DURING FLOW SWITCH WARM UP CYCLE
SYSTEM MONITORS FLOW SWITCH VOLTAGE.
SHELF CONDITION = 4.5V.
NORMAL SYSTEM CONDITIONS
OPERATIONS SEQUENCE
FLOW SWITCH WARM UP CYCLE COMPLETE
WHEN VOLTAGE > 3.75V.
APPLY AIR TO ACHIEVE SAFE PRESSURE. WHEN
SAFE PRESSURE SETPOINT IS ACHIEVED, SAFE
ENCLOSURE PRESSURE LED IS "ON".
FACTORY SETTING FOR SAFE PRESSURE SETPOINT =
1.5" H2O
RAPID EXCHANGE SOLENOID ENGAGED AFTER 3
SECOND DELAY.
THE FOLLOWING CONDITIONS MUST BE SATISFIED:
FLOW SWITCH
HIGH PRESSURE CHANNEL
FACTORY SETTING = 8" H2O
LOW PRESSURE CHANNEL
RAPID EXCHANGE ENDS
SOLENOID DE-ENGAGED
ENCLOSURE POWER ENERGIZED
LOSS OF SAFE PRESSURE
POWER SHUTDOWN DELAY TIMER ACTIVATED
ENCLOSURE POWER DE-ENERGIZED
DELAY ALARM OPTION SELECTED AT FACTORY TO
PROVIDE IMMEDIATE ALARM.
TO SEQ. 3
FAULT CONDITIONS
EMERGENCY SHUTDOWN
ENCLOSURE POWER DE-ENERGIZED
TO SEQ. 3
ENCLOSURE POWER BYPASS
ENCLOSURE POWER MAINTAINED
(IF BYPASS MODE IS UTILIZED)
OPTIONAL BYPASS ALARM OPTION PROVIDES ALARM
CONTACTS WHEN BYPASS MODE IS UTILIZED
LED STATUS 3
1. SYSTEM POWER
2. ENCLOSURE POWER OFF
3. SAFE ENCLOSURE PRESSURE
4. RAPID EXCHANGE FLOW
5. RAPID EXCHANGE TIMER
LED STATUS 4
1. SYSTEM POWER
2. ENCLOSURE POWER ON
3. SAFE ENCLOSURE PRESSURE
RAPID EXCHANGE TIMER BEGINS 5 SECONDS AFTER
ABOVE CONDITIONS ARE MET.
DURATION IS BASED ON RAPID EXCHANGE TIMER
SELECTION