User Interface
29
Waltron User Manual
9065 Luminescent Dissolved Oxygen Analyzer
Table 4.3: Configurable Alarm Settings.
4.5.11
ALARM OUTPUTS
An overview is given below of the alarm outputs and the corresponding activation conditions.
See Section 3.6.5 for an overview of the physical I/O connections.
General Alarm (A1):
All faults.
All error messages.
Temperature alarms for sensor 1 and/or sensor 2.
O
2
alarms for sensor 1 and/or sensor 2.
Digital output A1 (Normally Close, NC) is zero if there has been an alarm during two
measurements. The alarm can be reset by selecting ‘ACK/RESET ALARM’ in the Shortcut
menu. The digital output is then high (and remains high during the alarm signal).
O
2
Alarm (A2):
If the O
2
value of sensor 1 and/or sensor 2 is greater than the set value, then output A2 is
zero. N.B. output 1 is also zero in the case of an O
2
alarm.
These outputs can be reset by selecting ‘ACK/RESET ALARM’ in the Shortcut menu and
will then remain high (if the alarm signal continues).
O
2
Extra (Alarm) for Sensor 1(A3):
If the O
2
value of sensor 1 is greater than this value, then output A3 is zero.
For example, in the case of filtration, if the value is greater than the O
2
alarm high-high value
(O
2
extra), then output A3 cuts out. As a result, the process of the sensor 1 circuit can be
stopped. Or, for example, if the value is less than the O
2
low alarm value (O
2
extra), then
output A3 is activated. As a result, the aeration of the sensor 1 circuit can be started.
O
2
Extra (Alarm) for Sensor 2 (A4):
If the O
2
value of sensor 2 is greater than this value, then output A4 is zero.
The same conditions apply here as for the O
2
extra alarm for sensor 1.
Item
Range
Default
Unit
O
2
alarm
0 …. 45,000
100
ppb; ppm; mg/l; ug/l; % as; %
O
2
extra
0 …. 45,000
200
ppb; ppm; mg/l; ug/l; % as; %
Low temperature
-
10 … 150
20
° C; ° F
High temperature
-
10 … 150
20
° C; ° F