Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 18)

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This shows the positions for the key used in steps 4,
5, and 6 above. The upper position is used to set
enclosure pressure. The lower position is the locking
position described in step 6.
A Sequencing Diagram with LED operation is shown
in the following pages, continuing through to system
Fault Conditions.
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