4690 Series
Turbidity systems 8 Configuration and Electrical Calibration
IM/4690–EN Rev. A 29
8.4 Set Up Outputs Page
Set Up Outputs
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Alarm 1 Action
For 'Fail-safe' alarm operation the relay's alarm state must be the same as the power-down state,
(the relay is de-energized).
For high alarm operation the relay must be Energized Below (EB) the alarm set point.
For low alarm operation the relay must be Energized Above (EA) the alarm set point.
The alarm LEDs are lit in the alarm condition.
Select the required alarm 1 action from the following table:
Alarm Action LED Condition
for Input Above
Set Point
LED Condition
for Input Below
Set Point
Relay Condition
for Input Above
Set Point
Relay Condition
for Input Below
Set Point
EB ON OFF De-energized Energized
EA OFF ON Energized De-energized
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 set points. 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.
Alarm 1 Set Point
Using the and keys, set the alarm 1 set point to any value within the selected display span
– see
Display Span on page 27. The set point value is subject to hysteresis as detailed above.
Alarm 2 Action
Note. Displayed only if Test Cleaner is not set to YES – see Test Cleaner on page 28 (set
automatically to Wiper Unit Failed Alarm if
Test Cleaner is set to YES).
Repeat as for
Alarm 1 Action above.
Alarm 2 Set Point
Note. Displayed only if
Test Cleaner is not set to YES – see Test Cleaner on page 28 (set
automatically to Wiper Unit Failed Alarm if
Test Cleaner is set to YES).
Repeat as for
Alarm 1 Set Point above.
Retransmission Type
Using the and keys, select the retransmission current output range required, from 0 to 10,
0to20 or 4to20mA.
The current output range is assigned to the selected display span – see
Display Span on page 27.
Continued on next page.
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