19
7
PROGRAMMING AND ELECTRICAL CALIBRATION…
SET UP ALARM
– – – – –
High Spt ug/kg
1 5 0
.
– – – – –
– – – – –
A1 Action Hi/Lo
High
Low
A1 Type Status
Temp
DO
Off
To
Alter Sec. Code
7.4
Set Up Alarm Page
Press
to advance to next parameter
or
Press
to advance to
Set Up Retrans Page
, Section 7.5.
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.
Hi/Lo
Alarm activates above the
High Set Point
or below the
Low Set Point
.
High
Alarm activates above the
High Set Point
.
Low
Alarm activates below the
Low Set Point
.
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
Alarm 1 Set Point
. Alarm action
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…
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