Emerson MC68HC16Z1 1.3Typical Sequence, Responses To An Alarm, Return-To-Normalsequence, Zone

Introduction

1.3Typical Sequence

Figure 3 shows a typical sequence of how the Liqui-tect Monitoring System functions after detecting a leak, contamination or cable break in either Zone 1 or Zone 2. Responses depend on configuration settings. This example shows what happens when a leak is detected.

Figure 3 Example of typical sequence: Analog input reaches high setpoint

RESPONSES TO AN ALARM

RETURN-TO-NORMAL SEQUENCE

ALARM CONDITION DETECTED A leak is sensed along the cable defining Zone 1.

The horn sounds (audible horn on the controller board—silence horn by pressing any key on the LCD keypad)

The LCD flashes

ESC

ESC

RETURN TO NORMAL

The leak is controlled.

The alarm is cleared (automatically if Unlatched; must be cleared manually if Latched)

The horn stops sounding

(if user hasn’t silenced it)

The LCD stops flashing

ZONE 1

Entry in Alarm History Log

ZONE 1

Entry in Alarm History Log

LEAK @ 3495ft 29-AUG-03 09:29:10

ALARM RESET - LCD

29-AUG-03 09:42:11

ZONE 1

NO LEAK 29-AUG-03 09:42:11

(if alarms defined as Latched)

Entry in Zone Trend Log

(if alarms defined as Unlatched)

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