Alarms - Hanna Instruments PCA 311 Instruction Manual

Note:
LOW READING PROTECTION
OVERDOSING PROTECTION

ALARMS

To modify the Delta, edit the "Delta" line. The available values
are 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 3.0, 4.0.
The speed of the analyzer could be modified by changing the
sampling rate. A new decision regarding the bromine regulator
is taken only after a new measurement.
The Setpoint and Delta could be quickly consulted on one
bromine measuring panel.
To prevent excessive bromine dosing if the detector is not
working properly or the reagent bottle is empty, a "Detector
Error" is generated if the measured bromine value is under
the low point value. This error is generated only if the low
point feature is set active.
The bromine dosing is stopped and the SYSTEM ERROR LED
starts blinking.
To enable this feature, edit "Bromine Menu" - "Dosing control
Br" - "Low Point" value and set the "Low Point" status as
"Active". The allowed value is 0.0 to 2.0 mg/L.
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 0.1 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 enable this protection, edit "Bromine Menu" - "Dosing
control Br" - "Max. ON" value and set "Max. ON" status as
"Active". The allowed range is between 30 and 720 minutes.
Two alarm setpoints are available for bromine: Alarm high
and Alarm low.
The ALARM LED and alarm relay are activated when the
bromine concentration is higher than Alarm high or lower
than Alarm low.
To modify the alarm setpoints, enter the "Bromine Menu" -
"Alarms Bromine" and edit "Alarm Hi" or "Alarm Lo" value.
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