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7.4 Set Up Alarm Page
– – – – –
SET UP ALARM
– – – – –
A1 Type
Status
Temp
DO
Off
– – – – –
A1 Action
Hi/Lo
High
Low
1 5 0 .
High Spt
ug/kg
7 PROGRAMMING AND ELECTRICAL CALIBRATION...
Press
to advance to next parameter
or
Press
to advance to
Set Up Retrans Page
Alarm Type
Select the type of alarm required. For Status, Temp and DO alarm types, the alarm
l.e.d. is off and the relay energized during normal conditions. In a fail condition, the l.e.d.
is on and the relay de-energized.
Status The instrument alerts the operator to a power failure, a condition that causes
any of the error messages listed in Table 9.1 to be displayed, or the status of
a calibration.
Calibration Fail will cause the Relay and LED to pulse every second.
Temp
The instrument alerts the operator if the temperature of the process fluid
exceeds or drops below the set point value parameter, depending on the type
of Alarm Action selected below.
D.O.
The instrument alerts the operator if the Dissolved Oxygen value of the sample
exceeds or drops below the set point value parameter, depending on the type
of Alarm Action selected below.
Off
If selected, no alarm is set and the alarm l.e.d. is off and the relay de-energized
at all times.
Alarm Action
For 'Fail-safe' alarm operation the relay's alarm state must be the same as the power-
down state, i.e. the relay is de-energized.
For High alarm operation the relay must be energized below the alarm set point.
For Low alarm operation the relay must be energized above the alarm set point.
The alarm LEDs are illuminated in the alarm condition.
L
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D
A
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L
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F
F
Hi/Lo
Alarm activates above the
High
Alarm activates above the
Low
Alarm activates below the
The set point band is defined as the actual value of the set point plus or minus the
hysteresis value. The hysteresis value is ±1% of the
occurs if the input value is above or below the set point band. If the input moves within
the set point band, the last alarm action is maintained.
Continued on next page...
, Section 7.5.
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High Set Point
.
High Set Point
.
Low Set Point
Alarm 1 Set Point
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Low Set Point
. Alarm action
19
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