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Alarm relays are single pole-double throw (SPDT). When an alarm is activated, the coil is energized.
When an alarm activates,
AL1
,
AL2
, or
AL3
(as appropriate) appears periodically in the display.
5.4 CONFIGURING ALARMS AND ASSIGNING SETPOINTS
5.4.1 Purpose
This section describes how to do the following:
1.
disable all alarms,
2.
assign an alarm relay to a sensor,
3.
set the alarm logic to high or low,
4.
assign values to the alarm setpoints,
5.
set the alarm deadbands.
ALARM RELAYS MUST BE CONFIGURED BEFORE ASSIGNING SETPOINTS.
5.4.2 Definitions
1.
The Solu Comp II analyzer provided with the Model T1055 can be ordered with an optional alarm relay board.
If the alarm board is installed, the analyzer leaves the factory with default setpoints, which may bring in nui-
sance alarms when the analyzer is put in service. Users who do not intend to use the alarms and do not want
to be troubled changing alarm setpoints can disable alarms in a single step.
2.
ASSIGNING ALARMS. There are three alarms (
AL1
,
AL2
, and
AL3
). Alarms 1 and 2 can be assigned to any
sensor. For example,
AL1
and
AL2
can be assigned to sensor 1 with, perhaps, one alarm configured as a high
alarm and the other as a low alarm, and
AL3
can be assigned to sensor 2. Alarm 3 can be assigned to either
sensor or used as a fault alarm. The fault alarm activates when a fault exists in a sensor or the analyzer.
3.
FAULT ALARM. A fault condition exists when the Solu Comp II detects a problem with a sensor or with the ana-
lyzer that is likely to cause seriously erroneous readings. If Alarm 3 was programmed as a fault alarm, the
alarm 3 relay will activate. The word
Fault
will appear alternately in the display with the reading.
4.
ALARM LOGIC, SETPOINTS, AND DEADBANDS. See Figures 5-2 and 5-3.
FIGURE 5-2. High Alarm Logic
The alarm activates when the turbidity exceeds the
high setpoint. The alarm remains activated until the
reading drops below the value determined by the
deadband.
FIGURE 5-3. Low Alarm Logic
The alarm activates when the turbidity drops below the
low setpoint. The alarm remains activated until the
reading increases above the value determined by the
deadband.
MODEL CLARITY II
SECTION 5.0
PROGRAMMING THE ANALYZER
