Manual OPTISENS AAM 1050
OPTISENS AAM 1050
22
NOTE
In case of an alarm due to dosage check, only the controller concerned is deactivated.
NOTE
If you set the dosage check time to 0 seconds, the dosage check function is deactivated.
8.
Alarm
Additional to the limit function the instrument provides various check functions that raise alarm. In case of
alarm, the alarm relay switches instantly and the cause of alarm is indicated in the display.
If the cause of alarm is such that control is no longer possible or might even be dangerous, the controller is
automatically deactivated until the alarm is switched off.
Switching off the alarm is done automatically by the instrument as soon as the cause of alarm is eliminated.
Failures connected with the measurement - input errors and low water - also lead to a current output of 0mA
(only when assigned to the measurement).
Additional to the limit function the device provides various check functions that raise alarm.
In case of an alarm, relay 3 switches, undelayed, and the cause of the alarm is indicated in the display.
If the cause of alarm is such that control is no longer possible or might even be dangerous, the controller is
automatically deactivated until the alarm is switched off.
Switching off the alarm is done automatically by the device as soon as the cause of alarm is eliminated.
Sensor check during calibration
If a sensor gives unsatisfying results during calibration, an alarm is issued. The alarm is held until a new
calibration shows satisfying sensor data. In case of calibration failure the controller is not deactivated, to
enable you to continue the dosing or treatment process until a replacement sensor is at hand.
Sensor check during measurement
During measurement all connected sensors are checked. If an analog input does not receive a correct signal,
for e. g. if a cable is broken or a sensor damaged, an alarm is issued, and the controller deactivated. Alarm
and controller stop remain until the analog input receives correct signals again.
In case of an input error, the current output is set to 0mA.
Low water
If a flow switch is connected to the digital input, in a low water situation (<30 l/h) the flow monitor will issue an
alarm. The alarm remains until the flow monitor shows that water is again available. During the alarm the
controller is deactivated, and the current output set to 0mA.
Dosage control
If a controller output is 100% longer than the defined dosage time, an alarm is issued, and the corresponding
controller is deactivated. The alarm remains until the controller output drops below 100% - it can also be
extinguished by setting the controller to manual mode.
Cause of alarm
only active in AUTO mode
deactivates controller
Slope error
no
no
Error input 1
no
yes
Error input 2
no
yes
Limit
adjustable
no
Dosage
yes
yes
Low water
no
yes
