10
2.5 Alarms
An alarm function is available to provide an indication that Conductivity and/or pH have been
outside the limits by a set margin for a set period of time. This alarm is useful, as it can provide
forewarning of a potential system problems, such as empty tanks or faulty sensors.
To use the alarm function, the alarm margin on either side of the limit must first be set. A delay
time must then be set so that the alarm is not activated immediately. This allows for momentary
spikes outside the alarm margin. Once the alarm margin and delay times have been set, the alarm
function must be enabled. The following sections detail these procedures, and examples are
provided at the end.
2.5.1 Setting the Alarm Margins
1. Select the Alarms menu (
→
→
F3:Limits
→
→
F4:Alarms
).
2. Select
F2:Set Alarm Margins
from the menu. The current Conductivity alarm margin is
displayed. For example…
Enter COND Alarm Margin :0.30mS/cm
Low Alarm at 1.50, High Alarm 2.30mS/cm
Use the
and
keys to set the Conductivity alarm margin. The minimum alarm margin is
dependant on the Control Sensitivity setting, which can be 0.10 mS/cm (Fine), 0.20 mS/cm
(Medium) or 0.30 mS/cm (Coarse). The maximum alarm margin is 2.00 mS/cm.
The Low and High Alarm values displayed are calculated using the current Conductivity Limit
and Sensitivity settings.
As the
or
key is released, the display is updated with re-calculated Low and High Alarm
values.
Press
to save the new value, or press
to quit without saving the changes.
3. The current pH alarm margin is now displayed. For example…
Enter pH Alarm Margin : 0.3pH
Low Alarm at 6.2pH, High Alarm 7.0pH
Use the
and
keys to set the pH alarm margin. The minimum alarm margin is dependant
on the Control Sensitivity setting, which can be 0.1 pH (Fine), 0.2 pH (Medium) or 0.3 pH
(Coarse). The maximum alarm margin is 3.0 pH.
The Low and High Alarm values displayed are calculated using the current pH Limit and
Sensitivity settings.
As the
or
key is released, the display is updated with re-calculated Low and High Alarm
values.
Press
to save the new value, or press
to quit without saving the changes.
4. The alarm margins are now set to the required values.
