Swann AMU pH-Redox Operator's Manual page 73

AMU pH-Redox
Program List and Explanations
5.2.1.43.3
5.2.1.43.4
5.2.1.43.5
5.3 Relay Contacts
5.3.1
5.3.1.1
5.3.1.1.1
A-96.250.441 / 060619
Reset time: The reset time is the time till the step response of a sin-
gle I-controller will reach the same value as it will be suddenly
reached by a P-controller.
Range: 0–9'000 sec
Derivative time: The derivative time is the time till the ramp re-
sponse of a single P-controller will reach the same value as it will
be suddenly reached by a D-controller.
Range: 0–9'000 sec
Control timeout: If a controller action (dosing intensity) is constantly
over 90% during a defined period of time and the process value
does not come closer to the setpoint, the dosing process will be
stopped for safety reasons.
Range: 0–720 min
Alarm Relay: The alarm relay is used as cumulative error indicator.
Under normal operating conditions the contact is active.
The contact is inactive at:
 Power loss
 Detection of system faults like defective sensors or electronic
parts
 High case temperature
 Process values out of programmed ranges.
Program alarm levels for the following parameters:
 Meas. Value
 Temperature
 Sample Flow (if a flow sensor is programmed)
 Case Temperature high
 Case Temperature low
Alarm
Alarm High: If the measured value rises above the alarm high val-
ue, the alarm relay is activated and E001, is displayed in the mes-
sage list.
pH sensor
Range: -3 pH to +15 pH
Redox sensor
-500 mV to +1500 mV
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