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Section 3
3.17 Alarm Setup
3.17.1 Set Point Adjustment
Figure 25
Alarm Configuration Menu
3.17.2 High Set Point Setup
Figure 26
High Set Point Example
3.17.3 Low Set Point Setup
Page 40
Alarm Setup
manufacturer chlorine probes under ideal conditions) and makes appropriate
internal adjustments. Probe sensitivity is displayed as a percentage in the
lower right corner of the display during zero and span calibration procedures.
The displayed probe sensitivity may range from 50% to over 500% (nominal is
100%) and is good indicator of the probe's overall operating condition. It is
recommended that the sensitivity value be recorded each time the probe is
rebuilt or calibrated to obtain a trend. If a 50% reduction or increase in probe
sensitivity is experienced after performing system calibration, the probe
should be checked (e.g., for a dirty or torn membrane) or rebuilt. Probes which
indicate a 60% or below relative probe sensitivity should be re-calibrated or
rebuilt (see
section 2.10 on page
Series 8400 Residual Chlorine Monitors contain two independently
programmable alarms. When an alarm occurs, the front-panel alarm LED
lights and the relay for that alarm is set. Each alarm relay can be set up as
either a high or low set point alarm and can operate in either normal or fail-
safe mode. A time delay function, alarm inhibit, and test function are standard
features.
>Set Reset lfit
10.0 7.50
To change alarm set-points enter the "ALM" (Alarm) menu and select either
Alarm 1 or Alarm 2 (ALM1 or ALM2). Place the menu cursor on "Set "and
select the concentration at which the alarm is to be activated. Next, place the
menu cursor on "Reset" and select the concentration at which the alarm relay
is to be de-activated.
To set a high alarm, select a "Set" value which is (higher) than the "Reset"
alarm value. In the illustration below, the alarm relay will set if and when the
concentration goes above 10 ppm and will not reset until the concentration
goes below 5 ppm.
A high set point is also established whenever the Set and Reset values are
set to the same number. For example, if both Set and Reset are set to 8 ppm,
the alarm will not occur (set) until the concentration exceeds 8 ppm and will
not reset until the concentration drops below 8 ppm.
>Set Reset lfit
10.0 5.00
To set a low alarm, select a Set value which is (lower) than the "Reset" value.
In the example below, the alarm will occur when the concentration falls below
5 ppm and will reset if the concentration rises above 10 ppm.
24).
0101
0000
16116Operation.fm
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