Hanna Instruments PCA 300 Series - Manual (Page 28)

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Example
With the previously given values, sample rate 5 minutes and
measured value 2.8 mg/L, the proportional dosing will be
active for the initial 2 minutes and will stop for the remaining
3 minutes. In fact:
0.5 mg/L : 5 min = 0.2 mg/L (3-2.8) : X
then X = 2 minutes.
CONCENTRATION SETPOINT ALARM SETTING
PCA 300 and PCA 301 are equipped with a fully program-
mable concentration alarm that will activate an indication
when the chlorine concentration limit is exceeded. The alarm
can be set to actuate at any point from 0.00 to 5.00 mg/L.
• To set the concentration level alarm setpoint, press
SET ALARM and the display will show the previously pro-
grammed setpoint.
Note If the analyzer has been turned on for the first time, “0.00”
will appear as default setpoint.
• Using the and keys set the new the mg/L Chlorine
value as desired alarm level (e.g. 2.50 mg/L).
• Press SET ALARM twice to set the alarm level.
• To set the stored value as a minimum or
maximum level, press DIAG. The display will show the last
diagnostic mode and the right-most numerical digit will
blink.
DIAG