Aztec 600 aluminium, ammonia, color, iron, manganese, phosphate
Single- and multi-stream colorimetric analyzers 6 Configuration
IM/AZT6CR–EN Rev. J 35
There are six tabs in the Alarm Relays screen, one for each alarm:
Fields Description
Alarm Source
Each of the six alarms can be configured independently to one of the following sources:
None – no other fields are visible
Stream 1 to Stream 3
The following fields are displayed only if 'Alarm Source' is set to 'Stream X':
Alarm Type
If 'Alarm Source' is set to Stream X, the alarm type can be set to:
High/Low process – see Fig. 6.3, page 34.
High/Low latch – see Fig. 6.4, page 34.
High/Low annunciate– see Fig. 6.5, page 34.
Out of sample – the alarm state is active if an out-of-sample condition occurs in the selected
stream source.
Alarm Tag The Alarm identification tag – up to 20 characters.
Trip The value at which the alarm is to activate.
Hysteresis
When an alarm trip value is exceeded, the alarm does not become active until the time hysteresis
value has expired. If the signal goes out of the alarm condition before the time hysteresis has expired,
the hysteresis value is reset – see page 34 for hysteresis actions.
The hysteresis value is set in concentration units, and the hysteresis time is set in seconds (0 to
5000 s).
Fail Safe
If set to 'Yes' the alarm relay is normally energized and is de-energized when an alarm condition
occurs.
If set to 'No' the alarm relay is normally de-energized and is energized when an alarm condition
occurs.
Log Enable
If set to 'On' all changes in the alarm state in the Alarm Event log are recorded – see Section 7.5.3,
page 47.
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