Hanna Instruments PCA 310 - Manual (Page 39)

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To modify the Delta, edit the “Delta” line. The available values
are 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 3, 4, 5.
Note: The speed of the analyzer could be modified by changing the
sampling rate. A new decision regarding the chlorine regula-
tor is taken only after a new measurement.
The Setpoint and Delta could be quickly consulted on one
chlorine measuring panel.
LOW READING PROTECTION
To prevent excessive chlorine dosing if the detector is not work-
ing properly or the reagent bottle is empty, a “Detector Error”
is generated if the measured chlorine value is under the low
point value. This error is generated only if the low point fea-
ture is set active.
The chlorine dosing is stopped and the SYSTEM ERROR LED
starts blinking.
To enable this feature, edit “Chlorine Menu” - “Dosing con-
trol Cl” - “Low Point” value and set the “Low Point” status as
“Active”. The allowed value is 0.00 to 1.00 mg/L.
OVERDOSING PROTECTION
To prevent overdosing a “Detector Error” is generated if the
dosing command is on for the Max. ON time and the read
value is changing less than 0.05 mg/L.
The chlorine dosing is stopped and the SYSTEM ERROR LED
starts blinking. The dosing could be resumed only by restarting
the controller.
To modify this protection, edit “Chlorine Menu” - “Dosing
control Cl” - “Max. ON” value. The allowed range is be-
tween 30 and 720 minutes.
ALARMS
Two alarm setpoints are available for chlorine: Alarm high
and Alarm low.
The ALARM LED and alarm relay are activated when the chlo-
rine concentration is higher than Alarm high or lower than
Alarm low.
To modify the alarm setpoints, enter the “Chlorine Menu” -
“Alarms Chlorine” and edit “Alarm Hi” or “Alarm Lo” value.