Hanna Instruments PCA 310 - Manual (Page 24)

24
DOSING
CHLORINE
DOSING
CHLORINE
C NO
Alarm Relay
A system alarm feature provides relay activation
to signal that the measuring value exceed the
alarm setpoints. The alarm relay is closed (Com-
mon connect to Normal Close) if the value is
lower than alarm low setpoint or higher than
alarm high setpoint.
The ALARM LED blinks when alarm is active.
Note: The Alarm relay is power-fail safe and is closed when the
analyzer is not powered.
System Error Relay
A system error feature provides relay activation to
signal the need for operator intervention through
an external device, such as a buzzer, a light or any
other electrical equipment. When errors appears,
the relay is closed (Common connect to Normal
Close).
The SYSERR LED blinks when a system error occurred.
If the situation persists for more than a few samples, the op-
erator should notify maintenance personnel for investigation
of the problem.
Note: When the meter is in alarm mode or in system error mode, the
user could directly view the alarm or error description on the
display.
If GSM transmitter is installed and GSM mode is selected, the
alarms and errors are sent as SMS message.
The System error relay is power-fail safe and is closed when
the analyzer is not powered.
Chlorine Dosing Relay
The chlorine dosing relay is activated (Common
connected to Normal Open) when chlorine con-
centration is under the dosing setpoint. The chlo-
rine dosing use a proportional algorithm that de-
pends on both, setpoint and delta.
The DOSING CHLORINE LED is turned on when
the dosing relay is closed.
Note: The chlorine dosing is stopped when the concentration is over
Alarm high setpoint or when a System error related to chlorine
measurement occurs.
ALARM
C NO NC
SYSTEM
ERROR
SYSTEM
ERROR
C NC